Page 1
IMPORTANT NOTES:
1) This manual is valid for the following Model and associated serial numbers:
MODEL SERIAL NO. REV. NO.
KLP 20-120-1200 REV.11
KLP 36-60-1200 REV.11
KLP 75-33-1200 REV.24
KLP 150-16-1200 REV.21
KLP 300-8-1200 REV.13
KLP 600-4-1200 REV.2
2) A Change Page may be included at the end of the manual. All applicable changes and
revision number changes are documented with reference to the equipment serial numbers. Before using this Instruction Manual, check your equipment serial number to identify
your model. If in doubt, contact your nearest Kepco Representative, or the Kepco Documentation Office in New York, (718) 461-7000, requesting the correct revision for your
particular model and serial number.
3) The contents of this manual are protected by copyright. Reproduction of any part can be
made only with the specific written permission of Kepco, Inc.
Data subject to change without notice.
KEPCO®
THE POWER SUPPLIER™
MODEL
OPERATOR’S MANUAL
ORDER NO. REV. NO.
KEPCO, INC. ! 131-38 SANFORD AVENUE ! FLUSHING, NY. 11355 U.S.A. ! TEL (718) 461-7000 ! FAX (718) 767-1102
email: hq@kepcopower.com ! World Wide Web: http://www.kepcopower.com
KEPCO INC.
An ISO 9001 Company.
KLP SERIES
POWER SUPPLY
1200 WATT PROGRAMMABLE POWER SUPPLY
KLP SERIES
POWER SUPPLY
©2008, KEPCO, INC
P/N 243-0979-e
Page 2
Page 3
228-1348 DC-COMP/INST 073008 A
Declaration of Conformity
Application of Council directives:
73/23/EEC (LVD)
93/68/EEC (CE mark)
Standard to which Conformity is declared:
EN61010-1:2001 (Safety requirements for electrical equipment for measurement,
control and laboratory use - Part 1)
Manufacturer's Name and Address:
KEPCO INC.
131-38 SANFORD AVENUE
FLUSHING, N.Y. 11352 USA
Importer's Name and Address:
Type of Equipment:
Component Power Supply
Model No.:
[PRODUCT MODEL NUMBER]
Year of Manufacture:
I, the undersigned, declare that the product specified above, when used in conjunction with the conditions of conformance set forth in the product instruction manual, complies with the requirements of the
Low Voltage Directive 73/23/EEC, which forms the basis for application of the CE Mark to this product.
Place: KEPCO Inc.
131-38 Sanford Ave.
Flushing, N.Y.11352 USA
Date:
Saul Kupferberg
(Full Name)
VP OF SALES
(position)
R
E
P
R
E
S
E
N
T
A
T
I
V
E
C
O
P
Y
Page 4
B 228-1351 COND/CONFORM 073008
Conditions of Conformance
When this product is used in applications governed by the requirements of the EEC, the following restrictions and conditions apply:
1. For European applications, requiring compliance to the Low Voltage Directive, 73/23/EEC, this power
supply is considered a component product, designed for "built in“ applications. Because it is incomplete in construction, the end product enclosure must provide for compliance to any remaining electrical safety requirements and act as a fire enclosure. (EN61010-1:2001, Cl. 6, Cl. 7, Cl.8, and Cl. 9)
2. This power supply is designed for stationary installation, with mains power applied via a detachable
power supply cord or via direct wiring to the source power terminal block.
3. This power supply is considered a Class 1 (earthed) product. It is intended for use as part of equipment meant for test, measurement and laboratory use, and is designed to operate from single phase,
three wire power systems. This equipment must be installed within a suitably wired equipment rack,
utilizing a three wire (grounded) mains connection. See wiring section of this manual for complete
electrical wiring instructions. (EN61010-1:2001, Cl.6.10.1)
4. This power supply has secondary output circuits that are considered hazardous, and which exceed
240 VA at a potential of 2V or more.
5. The output wiring terminals of this power supply has not been evaluated for field wiring and, therefore,
must be properly configured by the end product manufacturer prior to use.
6. This power supply employs a supplementary circuit protector in the form of a circuit breaker mounted
on the front panel. This circuit breaker protects the power supply itself from damage in the event of a
fault condition. For complete circuit protection of the end product, as well as the building wiring, it is
required that a primary circuit protection device be fitted to the branch circuit wiring. (EN610101:2001, Cl. 9.5)
7. Hazardous voltages are present within this power supply during normal operation. All operator adjustments to the product are made via externally accessible switches, controls and signal lines as specified within the product operating instructions. There are no user or operator serviceable parts within
the product enclosure. Refer all servicing to qualified and trained Kepco service technicians.
Page 5
228-1353 SAFETY - (SWITCH) 073008 C/(D BLANK)
SAFETY INSTRUCTIONS
1. Installation, Operation and Service Precautions
This product is designed for use in accordance with EN 61010-1 and UL 3101 for Installation Category 2,
Pollution Degree 2. Hazardous voltages are present within this product during normal operation. The product should never be operated with the cover removed unless equivalent protection of the operator from
accidental contact with hazardous internal voltages is provided:
2. Grounding
This product is a Class 1 device which utilizes protective earthing to ensure operator safety.
3. Electric Shock Hazards
This product outputs hazardous voltage and energy levels as a function of normal operation. Operators
must be trained in its use and exercise caution as well as common sense during use to prevent accidental
shock.
There are no operator serviceable parts or adjustments within the product enclosure.
Refer all servicing to trained service technician.
Source power must be removed from the product prior to performing any servicing.
The PROTECTIVE EARTHING CONDUCTOR TERMINAL must properly connected prior to application of source power to the product (see instructions on installation herein) in order to ensure safety from electric shock.
PROTECTIVE EARTHING CONDUCTOR TERMINAL - This symbol indicates the
point on the product to which the protective earthing conductor must be attached.
EARTH (GROUND) TERMINAL - This symbol is used to indicate a point which is
connected to the PROTECTIVE EARTHING TERMINAL. The component installer/
assembler must ensure that this point is connected to the PROTECTIVE EARTHING TERMINAL.
CHASSIS TERMINAL -This symbol indicates frame (chassis) connection, which is
supplied as a point of convenience for performance purposes (see instructions on
grounding herein). This is not to be confused with the protective earthing point, and
may not be used in place of it.
This symbol appears adjacent to any external terminals at which hazardous voltage
levels as high as 500V d-c may exist in the course of normal or single fault conditions.
This symbol appears adjacent to any external terminals at which hazardous voltage
levels in excess of 500V d-c may exist in the course of normal or single fault conditions
!
!
!
!
Page 6
Page 7
KLP SVC 020498 i
TABLE OF CONTENTS
SECTION PAGE
SECTION 1 - INTRODUCTION
1.1 Scope of Manual......................................................................................................................................... 1-1
1.2 General Description .................................................................................................................................... 1-1
1.3 Specifications.............................................................................................................................................. 1-1
1.4 Features...................................................................................................................................................... 1-8
1.4.1 Local Control ........................................................................................................................................... 1-8
1.4.2 Remote Control ....................................................................................................................................... 1-8
1.4.2.1 Digital Programming ........................................................................................................................... 1-8
1.4.2.2 Analog Programming ......................................................................................................................... 1-8
1.4.3 Digital Calibration .................................................................................................................................... 1-8
1.4.4 Overvoltage/Overcurrent Protection........................................................................................................ 1-9
1.4.5 User-defined Voltage/Current Limits (Virtual Models) ............................................................................. 1-9
1.4.6 Storage of User-Programmed Active Settings ........................................................................................ 1-9
1.4.7 User-Programmed Sequences................................................................................................................ 1-9
1.4.8 Last Setting Recall .................................................................................................................................. 1-9
1.4.9 Built-in Protection .................................................................................................................................... 1-9
1.4.10 Internal Relay .......................................................................................................................................... 1-10
1.4.11 Master/Slave Control............................................................................................................................... 1-10
1.5 Equipment Supplied.................................................................................................................................... 1-10
1.6 Accessories ................................................................................................................................................ 1-10
1.7 Safety.......................................................................................................................................................... 1-10
SECTION 2 - INSTALLATION
2.1 Unpacking and Inspection .......................................................................................................................... 2-1
2.2 Terminations and Controls.......................................................................................................................... 2-1
2.2.1 Front Panel Controls and Indicators. ....................................................................................................... 2-1
2.2.2 Rear Panel Connectors and Switch. ....................................................................................................... 2-1
2.3 Source Power Requirements...................................................................................................................... 2-5
2.4 Cooling........................................................................................................................................................ 2-5
2.5 Preliminary Operational Check ................................................................................................................... 2-5
2.6 Installation................................................................................................................................................... 2-6
2.6.1 Rack Mounting ........................................................................................................................................ 2-6
2.7 Wiring Instructions ...................................................................................................................................... 2-6
2.7.1 Safety Grounding .................................................................................................................................... 2-7
2.7.2 Source Power.......................................................................................................................................... 2-7
2.7.2.1 Current Rating .................................................................................................................................... 2-7
2.7.2.2 Connections ....................................................................................................................................... 2-7
2.7.3 D-C Output Grounding ............................................................................................................................ 2-8
2.7.4 Power Supply/Load Interface .................................................................................................................. 2-9
2.7.5 Load Connection - General ..................................................................................................................... 2-9
2.7.5.1 Local Sensing/Remote Sensing Select .............................................................................................. 2-9
2.7.6 Series Operation ..................................................................................................................................... 2-10
2.7.7 Parallel/redundant Operation .................................................................................................................. 2-10
2.7.7.1 Load Sharing ...................................................................................................................................... 2-12
2.7.8 Master/Slave Configurations ................................................................................................................... 2-12
2.7.9 Analog I/O Connections .......................................................................................................................... 2-12
2.7.10 Internal Relay Configuration.................................................................................................................... 2-13
SECTION 3 - OPERATION
3.1 General ....................................................................................................................................................... 3-1
3.2 Local Mode Operation ................................................................................................................................ 3-1
3.2.1 Turning the Power Supply On ................................................................................................................. 3-1
3.2.2 Setting Local/Remote Mode .................................................................................................................... 3-2
3.2.2.1 Remote with Local (Front Panel) Lockout .......................................................................................... 3-3
3.2.3 Enabling/Disabling Output Power............................................................................................................ 3-3
3.2.4 Checking Voltage/Current Setpoints ....................................................................................................... 3-4
3.2.5 Defining a Virtual Model .......................................................................................................................... 3-4
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ii KLP SVC 073008
TABLE OF CONTENTS
SECTION PAGE
3.2.6 Setting voltage or current........................................................................................................................ 3-5
3.2.6.1 Real-time Voltage/Current Adjustment .............................................................................................. 3-6
3.2.6.2 Setpoint Adjustment .......................................................................................................................... 3-6
3.2.6.3 Last Setting Recall............................................................................................................................. 3-6
3.2.7 Viewing/Changing Overvoltage or Overcurrent Protection Values ......................................................... 3-6
3.2.8 Changing GPIB Address......................................................................................................................... 3-7
3.2.9 Changing RS232 Baud Rate .................................................................................................................. 3-7
3.2.10 Setting up Master/Slave Configurations ................................................................................................. 3-8
3.2.10.1 Configure power supply as Master .................................................................................................... 3-8
3.2.10.2 Configure power supply as Slave ...................................................................................................... 3-9
3.2.10.3 Operating the Master/Slave Configuration ........................................................................................ 3-9
3.2.11 Utility Function ........................................................................................................................................ 3-10
3.2.11.1 Display System Firmware Version..................................................................................................... 3-10
3.2.11.2 Display Model .................................................................................................................................... 3-11
3.2.11.3 Relay Control..................................................................................................................................... 3-11
3.2.11.4 Quick Boot ......................................................................................................................................... 3-12
3.2.11.5 Analog Input Full SCale Calibration................................................................................................... 3-12
3.2.11.6 Calibration ......................................................................................................................................... 3-12
3.3 Digital Remote Mode Programming Using SCPI commands..................................................................... 3-13
3.3.1 Additional Functions Available via Digital Remote Programming ........................................................... 3-13
3.3.1.1 Storage of User-programmed Active Settings................................................................................... 3-13
3.3.1.2 User-determined output Sequences.................................................................................................. 3-13
3.3.1.3 External Triggering ............................................................................................................................ 3-14
3.3.1.4 Internal Relay Configuration.............................................................................................................. 3-14
3.4 RS232-C Operation ................................................................................................................................... 3-14
3.4.1 Serial Interface........................................................................................................................................ 3-15
3.4.2 RS 232 Implementation .......................................................................................................................... 3-15
3.4.2.1 Echo Mode ........................................................................................................................................ 3-16
3.4.2.2 Prompt Method .................................................................................................................................. 3-16
3.4.2.3 XON XOFF Method ........................................................................................................................... 3-17
3.4.2.4 Isolating RS 232 Communications Problems .................................................................................... 3-17
3.5 IEEE 488 (GPIB) Bus Protocol .................................................................................................................. 3-17
3.5.1 Changing the GPIB Address................................................................................................................... 3-18
3.5.2 KLP VISA Instrument driver.................................................................................................................... 3-19
3.6 SCPI Programming .................................................................................................................................... 3-19
3.6.1 SCPI Messages...................................................................................................................................... 3-20
3.6.2 Common Commands/Queries ................................................................................................................ 3-20
3.6.3 SCPI Subsystem Command/Query Structure......................................................................................... 3-20
3.6.3.1 ABORt Subsystem............................................................................................................................. 3-20
3.6.3.2 DISPlay Subsystem........................................................................................................................... 3-20
3.6.3.3 TRIGger Subsystem .......................................................................................................................... 3-20
3.6.3.4 LIST Subsystem ................................................................................................................................ 3-20
3.6.3.5 MEASure Subsystem ........................................................................................................................ 3-20
3.6.3.6 OUTPut Subsystem........................................................................................................................... 3-21
3.6.3.7 STATus Subsystem........................................................................................................................... 3-21
3.6.3.8 SYSTem subsystem .......................................................................................................................... 3-21
3.6.3.9 [SOURce:]VOLTage and [SOURce:]CURRent Subsystems............................................................. 3-21
3.6.3.10 CALibrate Subsystem........................................................................................................................ 3-21
3.6.4 Program Message Structure................................................................................................................... 3-21
3.6.4.1 Keyword............................................................................................................................................. 3-22
3.6.4.2 Keyword Separator ............................................................................................................................ 3-22
3.6.4.3 Query Indicator .................................................................................................................................. 3-22
3.6.4.4 Data ................................................................................................................................................... 3-23
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KLP SVC 020498 iii
TABLE OF CONTENTS
SECTION PAGE
3.6.4.5 Data Separator................................................................................................................................... 3-23
3.6.4.6 Message Unit Separator .................................................................................................................... 3-23
3.6.4.7 Root Specifier..................................................................................................................................... 3-23
3.6.4.8 Message Terminator .......................................................................................................................... 3-24
3.6.5 Understanding The Command Structure................................................................................................. 3-24
3.6.6 Program Message Syntax Summary....................................................................................................... 3-26
3.6.7 Status Reporting...................................................................................................................................... 3-26
3.6.7.1 Status Reporting Structure................................................................................................................. 3-26
3.6.7.2 Operational Status Register ............................................................................................................... 3-28
3.6.7.3 QUEStionable Status Register ........................................................................................................... 3-28
3.6.8 SCPI Program Examples ........................................................................................................................ 3-28
3.7 Remote Programming Using Analog Signals ............................................................................................. 3-29
3.7.1 Enabling/Disabling the Output using Analog Control .............................................................................. 3-29
3.7.2 Programming with external resistance .................................................................................................... 3-30
3.7.3 Programming with external Voltage ........................................................................................................ 3-31
3.7.4 Changing Overvoltage or Overcurrent Protection Values in Analog Programming Mode....................... 3-31
SECTION 4 - CALIBRATION
4.1 General ....................................................................................................................................................... 4-1
4.2 Equipment Required ................................................................................................................................... 4-1
4.3 Calibration Using Front Panel Controls in Local Mode ............................................................................... 4-1
4.3.1 Voltage Calibration (Local) ...................................................................................................................... 4-2
4.3.2 Current Calibration (Local) ...................................................................................................................... 4-3
4.3.3 External Calibration (Local) ..................................................................................................................... 4-3
4.3.4 Calibration Exit (Local) ............................................................................................................................ 4-4
4.4 Calibration using VISA Driver Demo Program Soft Panel .......................................................................... 4-4
4.4.1 Voltage Calibration (VISA Demo)............................................................................................................ 4-5
4.4.2 Current Calibration (VISA Demo) ............................................................................................................ 4-6
4.4.3 Analog Reference Calibration (VISA Demo) ........................................................................................... 4-6
4.4.4 Calibration Exit (VISA Demo) .................................................................................................................. 4-7
4.5 Changing the Calibration Password ........................................................................................................... 4-7
4.6 Restoring Prior Calibration Values.............................................................................................................. 4-8
APPENDIX A - IEEE 488.2 COMMAND/QUERY DEFINITIONS
A.2 *CLS — Clear Status Command ............................................................................................................... A-1
A.3 *ESE — Standard Event Status Enable Command................................................................................... A-1
A.4 *ESE? — Standard Event Status Enable Query........................................................................................ A-2
A.5 *ESR? — Event Status Register Query..................................................................................................... A-2
A.6 *IDN? — Identification Query..................................................................................................................... A-2
A.7 *OPC — Operation Complete Command .................................................................................................. A-2
A.8 *OPC? — Operation Complete Query....................................................................................................... A-3
A.9 *RCL — Recall Command ......................................................................................................................... A-4
A.10 *RST — Reset Command.......................................................................................................................... A-4
A.11 *SAV — Save Command ........................................................................................................................... A-4
A.12 *SRE — Service Request Enable Command ............................................................................................ A-4
A.13 *SRE? — Service Request Enable Query ................................................................................................. A-5
A.14 *STB? — Status Byte Register Query ....................................................................................................... A-5
A.15 *TRG — Trigger Command ....................................................................................................................... A-5
A.16 *TST? — Self Test Query .......................................................................................................................... A-5
APPENDIX B - SCPI COMMAND/QUERY DEFINITIONS
B.1 Introduction ................................................................................................................................................ B-1
B.2 Numerical Values....................................................................................................................................... B-2
B.3 ABORt Command ...................................................................................................................................... B-2
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iv KLP SVC 073008
TABLE OF CONTENTS
SECTION PAGE
B.4 CAL Commands and Queries .................................................................................................................... B-2
B.5 DISPlay:TEXT? Query ............................................................................................................................... B-2
B.6 INITiate[:IMMediate] Command ................................................................................................................. B-2
B.7 INITiate:CONTinuous Command ............................................................................................................... B-3
B.8 INITiate:CONTinuous? Query .................................................................................................................... B-3
B.9 [SOURce:]LIST:CLEar Command ............................................................................................................. B-3
B.10 [SOURce:]LIST:CONTrol Command.......................................................................................................... B-4
B.11 [SOURce:]LIST:CONTrol? QUERY ........................................................................................................... B-4
B.12 [SOURce:]LIST:COUNt Command ............................................................................................................ B-4
B.13 [SOURce:]LIST:COUNt? Query ................................................................................................................. B-4
B.14 [SOURce:]LIST:COUNt:SKIP Command................................................................................................... B-4
B.15 [SOURce:]LIST:COUNt:SKIP? Query........................................................................................................ B-4
B.16 [SOURce:]LIST:CURRent Command ........................................................................................................ B-4
B.17 [SOURce:]LIST:CURRent? Query ............................................................................................................. B-5
B.18 [SOURce:]LIST:CURRent:POINts? Query................................................................................................. B-5
B.19 [SOURce:]LIST:DIRection Command ........................................................................................................ B-5
B.20 [SOURce:]LIST:DIRection? Query............................................................................................................. B-5
B.21 [SOURce:]LIST:DWELl Command ............................................................................................................ B-5
B.22 [SOURce:]LIST:DWELl? Query ................................................................................................................. B-5
B.23 [SOURce:]LIST:DWELl:POINts? Query..................................................................................................... B-5
B.24 [SOURce:]LIST:QUERy Command ........................................................................................................... B-6
B.25 [SOURce:]LIST:QUERy? Query ................................................................................................................ B-6
B.26 [SOURce:]LIST:VOLTage Command......................................................................................................... B-6
B.27 [SOURce:]LIST:VOLTage? Query ............................................................................................................. B-6
B.28 [SOURce:]LIST:VOLTage:POINts? Query................................................................................................. B-6
B.29 MEASure[:SCALar]:CURRent[:DC]? Query............................................................................................... B-6
B.30 MEASure:VOLTage[:SCALar][:DC]? Query............................................................................................... B-7
B.31 OUTPut[:STATe] Command....................................................................................................................... B-8
B.32 OUTPut[:STATe] Query ............................................................................................................................. B-8
B.33 OUTPut[:STATe]:PROTect:DELay Command ........................................................................................... B-8
B.34 OUTPut[:STATe]:PROTect:DELay? Query ................................................................................................ B-8
B.35 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude] Command ............................................................. B-8
B.36 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude]? Query .................................................................. B-8
B.37 [SOURce:]CURRent:LIMit:HIGH Command .............................................................................................. B-9
B.38 [SOURce:]CURRent:LIMit:HIGH? Query................................................................................................... B-9
B.39 [SOURce:]CURRent:MODE Command ..................................................................................................... B-9
B.40 [SOURce:]CURRent:MODE? Query.......................................................................................................... B-9
B.41 [SOURce:]CURRent:PROTection[:LEVel] Command ................................................................................ B-10
B.42 [SOURce:]CURRent:PROTection[:LEVel]? Query ..................................................................................... B-10
B.43 [SOURce:]CURRent:[:LEVel]TRIGgered[:AMPlitude] Command .............................................................. B-11
B.44 [SOURce:]CURRent:[:LEVel]TRIGgered[:AMPlitude]? Query ................................................................... B-11
B.45 [SOURce:]FUNCtion:MODE Command..................................................................................................... B-11
B.46 [SOURce:]FUNCtion:MODE? Query ......................................................................................................... B-12
B.47 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude] Command.............................................................. B-12
B.48 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude]? Query .................................................................. B-12
B.49 [SOURce:]VOLTage:LIMit:HIGH Command .............................................................................................. B-12
B.50 [SOURce:]VOLTage:LIMit:HIGH? Query ................................................................................................... B-12
B.51 [SOURce:]VOLTage:MODe
Command .................................................................................................... B-13
B.52 [SOURce:]VOLTage:MODe? Query ......................................................................................................... B-13
B.53 [SOURce:]VOLTage:PROTection[:LEVel] Command................................................................................. B-13
B.54 [SOURce:]VOLTage:PROTection[:LEVel]? Query ..................................................................................... B-13
B.55 [SOURce:]VOLTage:[:LEVel]TRIGgered[:AMPlitude] Command............................................................... B-13
B.56 [SOURce:]VOLTage:[:LEVel]TRIGgered[:AMPlitude]? Query ................................................................... B-14
B.57 STATus:OPERation:CONDition Query ...................................................................................................... B-14
B.58 STATus:OPERation:ENABle Command .................................................................................................... B-15
B.59 STATus:OPERation:ENABle? Query......................................................................................................... B-15
B.60 STATus:OPERation[:EVENt] Query........................................................................................................... B-15
B.61 STATus:PRESet Command....................................................................................................................... B-16
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KLP SVC 020498 v
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B.62 STATus:QUEStionable[:EVENt]? Query.................................................................................................... B-16
B.63 STATus:QUEStionable:CONDition? Query ............................................................................................... B-16
B.64 STATus:QUEStionable:ENABle Command............................................................................................... B-16
B.65 STATus:QUEStionable:ENABle? Query.................................................................................................... B-16
B.66 SYSTem:COMMunication:GPIB:ADDR
ess Command ............................................................................. B-17
B.67 SYSTem:COMMunication:GPIB:ADDRess ? Query................................................................................. B-17
B.68 SYSTem:COMMunication:SERial:BAUD CommanD................................................................................. B-17
B.69 SYSTem:COMMunication:SERial:BAUD? Query ...................................................................................... B-17
B.70 SYSTem:COMMunication:SERial:ECHO
Command................................................................................ B-17
B.71 SYSTem:COMMunication:SERial:ECHO? Query.................................................................................... B-17
B.72 SYSTem:COMMunication:SERial:ENABle Command ............................................................................. B-17
B.73 SYSTem:COMMunication:SERial:ENAB
? Query..................................................................................... B-17
B.74 SYSTem:COMMunication:SERial:PACE Command ................................................................................. B-17
B.75 SYSTem:COMMunication:SERial:PACE? Query ...................................................................................... B-18
B.76 SYSTem:COMMunication:SERial:PROMpt Command.............................................................................. B-18
B.77 SYSTem:COMMunication:SERial:PROMpt? Query .................................................................................. B-18
B.78 SYSTem:ERRor? Query ............................................................................................................................ B-18
B.79 SYSTem:ERRor:CODE? Query................................................................................................................. B-18
B.80 SYSTem:ERRor:CODE:ALL? Query ......................................................................................................... B-18
B.81 SYSTem:KLOCk Command....................................................................................................................... B-18
B.82 SYSTem:KLOCk? Query ........................................................................................................................... B-19
B.83 SYSTem:LANGuage Command ................................................................................................................ B-19
B.84 SYSTem:LANGuage? Query ..................................................................................................................... B-20
B.85 SYSTem:PASSword:CENable Command ................................................................................................. B-20
B.86 SYSTem:PASSword:CDISable Command ................................................................................................ B-20
B.87 SYSTem:PASSword:NEW
Command ...................................................................................................... B-20
B.88 SYSTem:PASSword:STATe? Query .......................................................................................................... B-20
B.89 SYSTem:SECurity:IMMediate Command .................................................................................................. B-20
B.90 SYSTem:SET Command ........................................................................................................................... B-20
B.91 SYSTem:SET? Query................................................................................................................................ B-21
B.92 SYSTem:VERSion Query .......................................................................................................................... B-21
B.93 TRIGger:SOURce Command .................................................................................................................... B-21
Page 12
LIST OF FIGURES
FIGURE TITLE PAGE
vi KLPSVC 073008
1-1 KLP Series Power Supply ........................................................................................................................... viii
1-2 KLP Operating Regions.............................................................................................................................. 1-2
1-3 KLP Series Power Supply, Mechanical Outline Drawing ........................................................................... 1-6
2-1 KLP Series, Front Panel Controls and Indicators ....................................................................................... 2-1
2-2 KLP Series, Rear Panel Switch and Connectors ....................................................................................... 2-2
2-3 Remote Sensing......................................................................................................................................... 2-10
2-4 Series Connection using Remote Sensing................................................................................................. 2-11
2-5 Parallel Connections Using Remote Sensing............................................................................................. 2-11
3-1 RS 232 Implementation.............................................................................................................................. 3-16
3-2 Message Structure ..................................................................................................................................... 3-23
3-3 Tree Diagram of SCPI Commands Used with KLP Power Supply............................................................. 3-25
3-4 Status Reporting Structure......................................................................................................................... 3-27
3-5 Typical Example Of KLP Power Supply Program Using SCPI Commands ............................................... 3-29
3-6 Analog Programming of Output Voltage or
Current using Resistance ....................................................................................................................... 3-30
3-7 Analog Programming of Output Voltage or Current using Voltage............................................................. 3-31
A-1 GPIB Commands ....................................................................................................................................... A-3
B-1 Programming the Output............................................................................................................................ B-3
B-2 Using LIST Commands and Queries.......................................................................................................... B-7
B-3 Programming Virtual Models ...................................................................................................................... B-10
B-4 Programming as a Current Stabilizer ......................................................................................................... B-11
B-5 Programming as Voltage Stabilizer ............................................................................................................ B-14
B-6 Using Status Commands and Queries ....................................................................................................... B-15
B-7 Using System Commands and Queries ..................................................................................................... B-19
Page 13
KLP SVC 020498 vii
LIST OF TABLES
TABLE TITLE PAGE
1-1 Model Parameters .......................................................................................................................................1-2
1-2 KLP Specifications ......................................................................................................................................1-3
1-3 Equipment Supplied ....................................................................................................................................1-10
1-4 Accessories .................................................................................................................................................1-11
1-5 Safety Symbols ...........................................................................................................................................1-11
2-1 Controls, and Indicators ..............................................................................................................................2-1
2-2 Analog I/O Switch Functions .......................................................................................................................2-3
2-3 IEEE 488 Port Connector (J4) Pin Assignments .........................................................................................2-3
2-4 RS232 Port Connector (J3) Pin Assignments .............................................................................................2-4
2-5 Rear Terminal block Assignments ..............................................................................................................2-4
2-6 Analog I/O Connector (J2) Pin Assignments ..............................................................................................2-4
2-7 Input Current Service Rating and Conductor Sizes ....................................................................................2-7
3-1 Power-up Built-in Test Error Codes ............................................................................................................3-2
3-2 IEEE 488 (GPIB) Bus Interface Functions ..................................................................................................3-18
3-3 IEEE 488 (GPIB) Bus Command Mode Messages .....................................................................................3-18
3-4 IEEE 488 (GPIB) Bus Data Mode Messages ..............................................................................................3-19
3-5 Rules Governing Shortform Keywords ........................................................................................................3-22
4-1 Factory Default Calibration Passwords .......................................................................................................4-8
A-1 IEEE 488.2 Command/query Index ........................................................................................................... A-1
A-2 Standard Event Status Enable Register and Standard Event Status Register Bits ................................... A-1
A-3 Service Request Enable and Status Byte Register Bits .............................................................................A-4
B-1 SCPI Subsystem Command/query Index .................................................................................................. B-1
B-2 Operation Condition Register, Operation Enable Register,
and Operation Event Register Bits .......................................................................................................... B-14
B-3 Questionable Event Register, Questionable Condition Register
and Questionable Condition Enable Register Bits ..................................................................................B-16
B-4 Error Messages .......................................................................................................................................... B-21
Page 14
viii KLP073008
FIGURE 1-1. KLP SERIES POWER SUPPLY
Page 15
KLP 073008 1-1
SECTION 1 - INTRODUCTION
1.1 SCOPE OF MANUAL
This manual contains instructions for the installation, operation and service of the KLP series of
1200W output power, stabilized voltage or current, d-c power supplies manufactured by
KEPCO, Inc., Flushing, New York, U.S.A.
DANGEROUS AND LETHAL POTENTIALS ARE PRESENT,
BOTH WITHIN THIS POWER SUPPLY, AND AT THE OUTPUT!
Before proceeding to use the power supply, read this manual very carefully. Caution must be used when working with, and making connections
to, this power supply. Use only wires with the proper voltage rating for
high voltage connections.
1.2 GENERAL DESCRIPTION
The KLP Power Supply Series (Figure 1-1) are autoranging, automatic crossover, 1200 watt
voltage/current stabilizers with a full rectangular output characteristic within the voltage and current ranges listed in Table 1-1.
Six models are available, as listed in Table 1-1. For each model a multitude of virtual models
can be configured from the front panel. The rated voltage, maximum current at rated voltage,
rated current and maximum voltage at rated current parameters define the virtual models available within the limit of 1200 Watts of output power (see Figure 1-2).
KLP power supplies operate from wide range 88-255V a-c, 45-66 Hz or 125-420V d-c input
source power. Since there are no internal adjustments, KLP Power Supplies offer excellent output voltage/current stability and easy calibration.
Output voltage and current are displayed on independent LED displays. Control of the KLP can
be either local, via the front panel controls and displays, or remote - using either analog signals
(applied to the Analog I/O Port), or digital programming via either the IEEE 488.2 (GPIB) or
RS 232 communication bus. Digital control is done with 12 bits of resolution over the entire voltage/current range.
The full-rack cross section permits mounting in a standard 19-inch wide rack (for optional chassis slides, see Table 1-4). Load connections are made at the rear panel. Sensing, monitor, and
current share terminals are also available at the rear panel. Outline dimensions are provided in
Figure 1-3.
1.3 SPECIFICATIONS
Table 1-1 lists the parameters applicable to individual models. Table 1-2 lists general specifications applicable to all models except where otherwise noted.
WARNING
Page 16
1-2 KLP 073008
FIGURE 1-2. KLP OPERATING REGIONS
TABLE 1-1. MODEL PARAMETERS
Model number
Rated
Vol tag e
Range
(1)
Maximum
current for
rated voltage
Minimum
programmable
current
Rated
Current
Range
(1)
Maximum
voltage for
rated current
Ripple and noise
Efficiency
@115 Va-c
rms p-p
(2)
KLP 20-120-1200
(3)
0-20V 60A@20V 1.6A 0-120A 10V@120A 10 mV 75 mV 82%
KLP 36-60-1200
(3)
0-36V 33.3A@36V 0.8A 0-60A 20V@60A 10 mV 125 mV 83%
KLP 75-33-1200 0-75V 16A@75V 0.4A 0-33.3A 36V@33.3A 10 mV 125 mV 84%
KLP 150-16-1200 0-150V 8A@150V 0.2A 0-16A 75V@16A 10 mV 125 mV 86%
KLP 300-8-1200 0-300V 4A@300V 0.1A 0-8A 150V@8A 20 mV 300 mV 87%
KLP 600-4-1200
(3)
0-600V 2A@600V 0.05A 0-4A 300V@4A tbd tbd 88%
(1) The maximum current and voltage are constrained by the 1200 watt power limitation, see Figure 1-2.
(2) Bandwidth: 20MHz; low frequency ripple may be higher at loads less than 30 Watts..
(3) Not all models available at this time. Please contact factory for additional information.
Page 17
KLP 073008 1-3
TABLE 1-2. KLP SPECIFICATIONS
SPECIFICATION RATING/DESCRIPTION CONDITION
INPUT CHARACTERISTICS
a-c voltage
nominal 110-240 Va-c Single Phase
range 100-255 Va-c Wide Range; contact factory for opera-
tion to 265V a-c.
d-c voltage range 125-420 Vd-c No regulatory agency approval
Frequency
nominal range 50-60 Hz
maximum 45-440 Hz Increased Leakage above 66 Hz
Power Factor typical 0.99 meets EN 61000-3-2
Maximum Input Current 120 Va-c 13A rms Rated load (1200W)
240 Va-c 6.5A rms Rated load (1200W)
Inrush Current
265 Va-c 40A Peak
132 Va-c 20A Peak
Input Fusing Circuit Breaker 2-line
Low a-c Protection Self protected No Fixed Limits
Output hold up typical 10 milliseconds Ride Through
Leakage Current 115 Va-c, 60Hz 5mA
230 Va-c 50Hz 10mA
OUTPUT CHARACTERISTICS
Type of stabilizer CV/CL Voltage/Current
Adjustment range voltage 0-100% of rated voltage no minimum load required
current 0-100% of rated current no minimum load required
Source effect voltage 0.01% E
max
over full source range
current 0.01% I
max
Load effect voltage 0.01% E
max
over full load current range
current 0.02% Imax
Temperature effect voltage 0.02%/deg C 0-50 deg C
current 0.05%/deg C
Time effect (drift) voltage 0.05%/24hr after 30 min warmup
current 0.05%/24hr
Error sensing 0.25 volts per wire above rated output
Isolation voltage 600 Vd-c or peak either output terminal to ground
Transient recovery
for load change
excursion 1% of E
max
50% load step 2A/microsecond max
recovery 0.2 msec return to 0.1% of setting
Turnon/turnoff overshoot same as load transient response limits
Overvoltage protection voltage programmable latched
(1)
Overcurrent protection current programmable latched
(1)
Overtemperature protection Shutdown latched
(1)
Open Load wire protection Shutdown latched
(1)
Parallel operation Active load sharing within 5% of Io rated Up to 5 units, maximum
Page 18
1-4 KLP 073008
GENERAL (ENVIRONMENTAL) SPECIFICATIONS
Temperature operating -20 to +50 deg C Rated load. Derate at 25W per °C
between 50 and 70°C.
storage -40 to +85 deg C
Cooling 3 internal d-c fans exhaust to the rear
Humidity 0 to 95% RH non condensing
Shock 20g, 11msec +/- 50% half sine non operating
Vibration 5 -10 Hz 10mm double amplitude 3-axes, non-operating
10-55 Hz 2g 3-axes, non-operating
Altitude sea level to 10000 ft. 0-3,000 ft: 100%, linear derating to
70% of power at 10,000ft.
PHYSICAL CHARACTERISTICS
Dimensions English 1.75'H x 19"W x 17.5"D depth excluding connectors and termi-
nal blocks (See Figure 1-3.)
metric 44.45 x 482.6 x 443.7 mm
Weight English 15 lbs
metric 6.82kg
Source power connector IEC 320-C19 appliance inlet 250 Va-c, 16A (VDE);
125V a-c, 20A (UL)
Load connections 8-36V models Nickel plated copper busbars Provision for safety covers
75-600V models Shocksafe Euroblock
Analog programming port. 15 pin D-sub
Digital programming port primary Standard GPIB connector IEEE 488.2 (GPIB)
secondary 9 pin D-sub RS 232
Direct output control 5 position low profile Euroblocks
PROGRAMMING CHARACTERISTICS - LOCAL
Local control rotary encoders panel mounted
Local control resolution Coarse ~100 LSB/step depress control for Fine resolution
Fine 1 LSB/step
Setting range 0-100% of rating KLP will decrement limit to maintain
1200 W maximum
Power up settings voltage defaults to zero DIP switch 3 set to off. (If DIP switch 3
set to ON, power up voltage and current set to last value set prior to power
down.)
current defaults to minimal value
Protection Limits
(2)
Emax 20-120% Programmable; accessed via front
panel protect switch or IEE 488.2 bus
command.
Imax 60-120%
NOTES:
(1) Requires the a-c input to be recycled for restart
(2) OVP and OCP limit adjustment is disabled in Remote Analog Mode
TABLE 1-2. KLP SPECIFICATIONS (Continued)
SPECIFICATION RATING/DESCRIPTION CONDITION
Page 19
KLP 073008 1-5
PROGRAMMING CHARACTERISTICS - ANALOG
Analog remote control selection Activate with jumper at analog program-
ming connector
Recognized during power up.
isolation Safety Extra Low Voltage (SELV) referenced to chassis
Programming by voltage voltage 0-10V Programmable
current minimal value-10V
Programming by resistance voltage 0-10K ohms Programmable
current 0-10K ohms
Readback 0-10V proportional signal Proportional to analog control volt-
age/resistance
Remote inhibit TTL compatible
Composite status flag Isolated form C contacts Programmable functions (PAR. 2.7.10)
Programming time 20 milliseconds 10% to 90% E
out
PROGRAMMING CHARACTERISTICS - DIGITAL
Digital remote control isolation Safety Extra Low Voltage (SELV) referenced to chassis
format compatible with SCPI protocols W95, W98 and NT operating systems
Programming resolution 0.024% of Emax and Ilim
Programming accuracy 0.05% of Emax and Ilim
Readback resolution 0.024% of Emax and Ilim
Readback accuracy 0.1% of Emax and Ilim
Status reporting OVP, OCP, OTP, output lead fault
(OLF), fan failure, power loss
See PAR. 1.4.4 and 1.4.9
NOTES:
(1) Requires the a-c input to be recycled for restart
(2) OVP and OCP limit adjustment is disabled in Remote Analog Mode
TABLE 1-2. KLP SPECIFICATIONS (Continued)
SPECIFICATION RATING/DESCRIPTION CONDITION
Page 20
1-6 KLP 073008
FIGURE 1-3. KLP SERIES POWER SUPPLY, MECHANICAL OUTLINE DRAWING (SHEET 1 OF 2)
R\DWG\MECH\3010266
Page 21
KLP 073008 1-7
FIGURE 1-3. KLP SERIES POWER SUPPLY, MECHANICAL OUTLINE DRAWING (SHEET 2 OF 2)
Page 22
1-8 KLP 073008
1.4 FEATURES
1.4.1 LOCAL CONTROL
Two front panel rotary encoders allow setting of voltage and current setpoints and limits. Operating mode of the power supply is indicated by lighting either a green (Constant Voltage) or
amber (Constant Current) LED. The output can be enabled or disabled by the front panel DC
OUTPUT switch; an associated indicator lights when the output is enabled (applied to the load).
Two 4-character LEDs normally display actual output voltage and current, or programmed voltage and current limits in setpoint mode. A selectable feature allows the unit to power up set
either to 0 Volts, minimum Amperes (default) or to the previous settings for voltage and current
when the unit was powered down (see Table 2-2).
The voltage and current controls and their associated LED displays are also used with the
FUNCTION switch and the 4-character status display for various other functions described in
PAR. 3.2. A local lockout feature (see PAR. 3.2.2.1) prevents alteration of the power supply settings from the front panel when the power supply is operating in remote mode.
1.4.2 REMOTE CONTROL
Remote control of the KLP Power Supply can be accomplished either through digital or analog
programming.
1.4.2.1 DIGITAL PROGRAMMING
Digital control is available directly via either the IEEE 488.2 (GPIB) or RS232 ports using SCPI
commands. Most features available in local mode can be accessed in remote mode through digital programming, as well as some that are only available via digital remote programming (PAR.
3.3.1). Front panel indicators showing operating mode and output voltage and current are active
when digital programming is used. Refer to PAR’s. 3.3, 3.4 and 3.6 for more information.
1.4.2.2 ANALOG PROGRAMMING
KLP Power Supplies can also be controlled remotely using switch selectable voltage or resistance. Analog programming functions include voltage and current programming, enabling/disabling the output, and voltage and current readback (see PAR. 3.7).
Full scale programming/readback can be programmed using either an input analog voltage from
0 to 10V or by an input analog resistance from 0 to 10KOhms. See PAR. 3.7 for more information.
1.4.3 DIGITAL CALIBRATION
Internal adjustments of the KLP Power Supply are automatic. Calibration can be performed in
either local or remote digital mode, using a calibrated DVM and a corresponding precision shunt
resistor.
Calibration constants for programming and read-back activities are calculated by the microcontroller and stored in the non-volatile memory. No internal adjustments are necessary The previous calibration is saved and can be restored if desired. The original factory calibration can also
be restored. Calibration is password-protected. Refer to Section 4 for more information.
Page 23
KLP 073008 1-9
1.4.4 OVERVOLTAGE/OVERCURRENT PROTECTION
Overvoltage and Overcurrent protection values can be individually programmed. If the output
voltage/current exceeds the overvoltage/overcurrent protection value, the protection circuit
latches the output off, flashes an overvoltage (OVP) or overcurrent (OCP) error message on the
status display and sets a status bit that can be retrieved through the RS 232 or GPIB port. The
N.O. and N.C. contacts of the relay provide status flags via the Analog I/O port connector. Refer
to PAR. 3.2.7 for more information.
1.4.5 USER-DEFINED VOLTAGE/CURRENT LIMITS (VIRTUAL MODELS)
The KLP Power Supply can be programmed to user-defined values that can be lower than the
maximum values. For example, the KLP 36-48-1200, will automatically be limited to 1200 Watts
as illustrated in Figure 1-2, however arbitrary limits, e.g., 40A@30V or 30A@35V can be established. Once the limits are set, setting values exceeding the limit values will not be accepted.
Refer to PAR. 3.2.5 for more information.
1.4.6 STORAGE OF USER-PROGRAMMED ACTIVE SETTINGS
The KLP Power Supply contains 40 memory locations that can be used to store active settings.
This feature is only available via digital remote programming. Values are stored in the nonvolatile memory, and are retained when the unit is turned off. Refer to PAR. 3.3.1.1 for more information.
1.4.7 USER-PROGRAMMED SEQUENCES
The KLP Power Supply contains 100 memory locations for programming sequences that can
program the KLP to produce a variety of sequential output operations. Each memory location
accommodates a value for voltage and current and a dwell time (how long the parameter is to
be in effect). Values are stored in the volatile memory, and are lost when the unit is turned off.
Refer to PAR. 3.3.1.2 for more information.
1.4.8 LAST SETTING RECALL
The KLP Power supply has the ability to retain the last voltage and current setpoints programmed before the unit is shut off. A DIP switch selection (position 3) allows the user to determine whether the power supply is set to 0V, minimum current or the retained voltage and
current setpoints upon the next power-up sequence. Refer to Table 2-2 and PAR. 3.2.6.3 for
more information.
1.4.9 BUILT-IN PROTECTION
KLP Series Power Supplies provide built-in protection against the conditions listed below. In
each case, a detected fault results in immediate latched shutdown of the power supply output.
In addition, the status display flashes the appropriate indication and the status bit is set for
retrieval through either of the digital programming ports. If the internal relay is configured for
FAULT mode (factory default setting, see PAR. 1.4.10) the relay will toggle to provide a composite fault indication at the analog programming port. The indication time is limited by internal holdup capacity for PWR faults (as the unit shuts down, when power is no longer sufficient to power
the relay it de-energizes.
a. Overtemperature (OTP). Monitors heatsink temperature; trips if it exceeds factory set limit.
b. Overvoltage (OVP) or overcurrent (OVC) at the output. (See PAR. 1.4.4)
c. Fan failure (FAN). Monitors all three internal cooling fans; trips If failure of any fan.
Page 24
1-10 KLP 073008
d. Output Lead Fault (OLF). Monitors output power and sense leads; trips if any discontinuity
(open circuit) is detected.
e. Source Power Loss (PWR). Monitors internal d-c bus voltage at output of PFC; trips if low
a-c input or PFC failure occurs.
1.4.10 INTERNAL RELAY
An internal relay provides common, normally open and normally closed contacts available to the
user via the analog I/O connector. This relay is normally programmed (factory default) to energize upon detection of a system fault (FLT mode). The relay may also be programmed to be
energized at the user’s discretion from the front panel (MAN mode), or as part of a user-specified program using LIST commands (LIST mode). Refer to PAR. 3.2.11.3 for details.)
1.4.11 MASTER/SLAVE CONTROL
For applications that require the use of multiple KLP power supply in either series (for higher
voltage) or parallel (for redundancy or higher current) the master/slave feature allows a single
power supply (the master) to automatically control both outputs to achieve the desired output.
Refer to PAR. 2.7.8 for details
1.5 EQUIPMENT SUPPLIED
Equipment supplied with the unit is listed in Table 1-3.
1.6 ACCESSORIES
Accessories for the KLP Power Supply are listed in Table 1-4.
1.7 SAFETY
There are no operator serviceable parts inside the case. Service must be referred to authorized
personnel. Using the power supply in a manner not specified by Kepco. Inc. may impair the protection provided by the power supply. Observe all safety precautions noted throughout this manual. Table 1-5 lists symbols used on the power supply or in this manual where applicable.
TABLE 1-3. EQUIPMENT SUPPLIED
ITEM
PART NUMBER QUANTITY
Source power connector 142-0381 1
Jumper (28 AWG or larger bus wire) for local sensing connections 172-0298 2
Analog I/O port mating connector 142-0528 1
Page 25
KLP 073008 1-11/1-12 Blank)
TABLE 1-4. ACCESSORIES
ITEM FUNCTION
KEPCO
PART NUMBER
Line Cord Set (125V/20A) 2.5m long cord set, provides for source power
connection. Mates with NEMA 5-20R receptacle
(see adjacent figure). Supports rated load power
over mains voltage range of 90-136V a-c.
NEMA 5-20R 118-0776
Line Cord Set (125V/15A) 2.5m long cord set, provides for source power
connection. Mates with NEMA 5-15R receptacle
(see adjacent figure). Supports restricted load
power over mains voltage range of 90-136V a-c
(contact Kepco Sales Engineering for details).
NEMA 5-15R 118-1136
Line Cord Set (250V/15A) 2.5m long cord set, provides for source power
connection. Mates with NEMA 6-15R receptacle
(see adjacent figure). Supports rated load power
over mains voltage range of 180-265V a-c.
NEMA 6-15R 118-1137
IEEE 488 (GPIB) Cable, 1m long Connect KLP Power Supply to GPIB bus. SNC 488-1
IEEE 488 (GPIB) Cable, 2m long Connect KLP Power Supply to GPIB bus. SNC 488-2
IEEE 488 (GPIB) Cable, 4m long Connect KLP Power Supply to GPIB bus. SNC 488-4
Chassis Slide (2) Allows rack-mounted units to slide in and out. 108-0239
(Jonathan
375-QD Series)
Analog Connector Backshell Locks analog port mating connector to KLP via jackscrews. 108-0204
Loop Back Test Connector Used for verification of RS 232 operation. 195-0112
Null Modem Cable, DB9F to
DB9F, 10 ft long
Connect RS 232 port with controlling computer 118-1176
Support bracket, rear Provides extra support to rear of rack-mounted unit if needed. Two
brackets required per unit. Each bracket requires 2 screws and 2
washers. See Figure 1-3, sheet 1, Detail “A” for requirements.
128-2306
TABLE 1-5. SAFETY SYMBOLS
SYMBOL MEANING
CAUTION: RISK OF ELECTRIC SHOCK.
CAUTION: REFER TO REFERENCED PROCEDURE.
WARNING INDICATES THE POSSIBILITY OF BODILY INJURY OR DEATH.
CAUTION INDICATES THE POSSIBILITY OF EQUIPMENT DAMAGE.
!
Page 26
Page 27
KLP-HV 073008 2-1
SECTION 2 - INSTALLATION
2.1 UNPACKING AND INSPECTION
This instrument has been thoroughly inspected and tested prior to packing and is ready for
operation. After careful unpacking, inspect for shipping damage before attempting to operate.
Perform the preliminary operational check as outlined in PAR 2.5. If any indication of damage is
found, file an immediate claim with the responsible transport service.
2.2 TERMINATIONS AND CONTROLS
2.2.1 FRONT PANEL CONTROLS AND INDICATORS. Refer to Figure 2-1 and Table 2-1.
2.2.2 REAR PANEL CONNECTORS AND SWITCH. Refer to Figure 2-2 and Tables 2-2 through 2-
6.
FIGURE 2-1. KLP SERIES, FRONT PANEL CONTROLS AND INDICATORS
TABLE 2-1. CONTROLS, AND INDICATORS
FIGURE 2-1
INDEX NO.
CONTROL OR
INDICATOR
FUNCTION
1 POWER ON/OFF
Circuit Breaker
Turns the power supply on or off. Applies input power to power supply internal circuits.
Circuit breaker provides input overload protection.
2VOLTAGE
control/switch
Multifunction rotary encoder with momentary contact pushbutton switch. Rotate to set
output voltage (PAR. 3.2.6) and overvoltage limit (PAR. 3.2.7). Also used to enter SET
mode of voltage programming (PAR. 3.2.6.2), and to perform calibration (PAR.4.3).
3 DC VOLTS
display
Four-digit LED display that shows voltage settings:
a. Shows actual output voltage (default).
b. Shows voltage set point (PAR. 3.2.6.2) or overvoltage limit when function selected
(PAR. 3.2.7).
4CV
indicator
Green LED lights to indicate power supply is operating in constant voltage mode (see
PAR. 3.2.6).
5Status
4 character display
Displays active function or blinks for error messages. Normally blank (VOLTAGE and
CURRENT LEDs display actual voltage and current).
6CC
indicator
Amber LED lights to indicate power supply is operating in constant current mode (see
PAR. 3.2.6).
Page 28
2-2 KLP-HV 073008
FIGURE 2-2. KLP SERIES, REAR PANEL SWITCH AND CONNECTORS
7 DC AMPERES
display
Four-digit LED display that shows current settings:
a. Shows actual output current (PAR.3.2.6).
b. Shows current set point or overcurrent limit when function selected (PAR. 3.2.6.2).
c. Shows GPIB address (PAR. 3.2.8), baud rate (PAR. 3.2.9).
d. Shows password (PAR. 3.2.5 and PAR. 4.3).
8 CURRENT
control/
momentary switch
Multifunction rotary encoder. Rotate to set output current (PAR. 3.2.6) and overcurrent
limit (PAR. 3.2.7). Also used to enter SET mode of current programming (PAR. 3.2.6.2),
change GPIB address (PAR. 3.2.8), change RS232 baud rate (PAR. 3.2.9), enter Virtual Model password (PAR. 3.2.5), and enter calibration password and perform calibration (PAR. 4.3)
9 DC OUTPUT
indicator
Green LED lights when DC output is enabled. LED is off when output is disabled.
10 DC OUTPUT
on/off switch
Enables or disables the DC Output. When output is disabled, current and voltage are
programmed to minimal value and zero, respectively (PAR. 3.2.3). Also used to accept
front panel inputs.
11 PROTECT
momentary switch
Used to set overvoltage and overcurrent (PAR. 3.2.7) protection limits.
NOTE: Requires a thin tool (e.g., end of paper clip) to press switch.
12 FUNCTION
momentary switch
Used to enter calibration (PAR. 4.3), change GPIB address (PAR. 3.2.8) and change
RS232 baud rate (PAR. 3.2.9) and (for -1200 models) set user-determined limits on
voltage and current (virtual model) (PAR. 3.2.5).
NOTE: Requires a thin tool (e.g., end of paper clip) to press switch.
TABLE 2-1. CONTROLS, AND INDICATORS (CONTINUED)
FIGURE 2-1
INDEX NO.
CONTROL OR
INDICATOR
FUNCTION
Page 29
KLP-HV 073008 2-3
TABLE 2-2. ANALOG I/O SWITCH FUNCTIONS
DIP SWITCH
POSITION
FUNCTION SETTINGS
1
Allows analog programming commands for voltage to be provided
by either variable voltage (PAR. 3.7.3) or resistance (PAR. 3.7.2).
When resistance mode is selected, an internal 1mA current generator provides the reference for voltage programming. (PAR. 3.7.2)
ON: Selects Resistance
OFF: Selects Voltage (factory
default)
2
Allows analog programming commands for current to be provided
by either variable voltage (PAR. 3.7.3) or resistance (PAR. 3.7.2).
When resistance mode is selected, an internal 1mA current generator provides the reference for current programming.
ON: Selects Resistance
OFF: Selects Voltage (factory
default)
3
When enabled (ON), allows retention of the last entered setpoint values for voltage and current in non-volatile memory for recall at the
next power-up sequence. (see PAR. 3.2.6.3). If not selected (OFF,
default condition), the stored values will be 0 volts, minimum amps.
The switch setting is detected upon unit power-up.
ON: Save and recall previous set-
point values upon power-up.
OFF: Power-up set to 0 Volts and
minimum current (factory
default).
4 NOT USED
5
Allows locking of the front panel controls. (see PAR. 3.2.2.1) ON: Local controls locked.
OFF: Local controls enabled (fac-
tory default).
TABLE 2-3. IEEE 488 PORT CONNECTOR (J4) PIN ASSIGNMENTS
CONNECTOR PIN SIGNAL NAME FUNCTION
IEEE 488
PORT
1
D
I01
I/O Line
2
D
I02
I/O Line
3
DI03
I/O Line
4
DI04
I/O Line
5 EOI End or Identify
6 D AV D ata Va l i d
7 NRFD Not Ready for Data
8 NDAC Not Data Accepted
9 IFC Interface Clear
10 SRQ Service Request
11 ATN Attention
12 SHIELD Shield
13
D
I05
I/O Line
14
DI06
I/O Line
15
DI07
I/O Line
16
DI08
I/O Line
17 REN Remote Enable
18 GND Ground (signal common)
19 GND Ground (signal common)
20 GND Ground (signal common)
21 GND Ground (signal common)
22 GND Ground (signal common)
23 GND Ground (signal common)
24 LOGIC GND Logic Ground
Page 30
2-4 KLP-HV 073008
TABLE 2-4. RS232 PORT CONNECTOR (J3) PIN ASSIGNMENTS
CONNECTOR PIN SIGNAL NAME FUNCTION
NOTE: A null modem cable (see Table 1-4) is required for nearly all applications, with the exception of those in which RXD and
TXD line transposition is accomplished via external hardware (e.g. older Apple MAC computers with D-sub serial port).
RS232-C
PORT
1 SGND Signal Ground
2RXD Receive Data
3 TXD Transmit Data
4 DTR Data Terminal Ready (protocol not used)
5 SGND Signal Ground
6 DSR Data Set Ready (protocol not used)
7 RTS Request To Send (protocol not used)
8 CTS Clear To Send (protocol not used)
9 SGND Signal Ground
TABLE 2-5. REAR TERMINAL BLOCK ASSIGNMENTS
TERMINAL FUNCTION
M+ Positive output monitor connection (TB5) (see PAR. 2.7.5.1)
S+ Positive sense connection (TB4) (see PAR. 2.7.5.1)
CS Current Share bus (TB3) (see PAR. 2.7.7.1)
S- Negative sense connection (TB2) (see PAR. 2.7.5.1)
M- Negative output monitor connection (TB1) (see PAR. 2.7.5.1)
TABLE 2-6. ANALOG I/O CONNECTOR (J2) PIN ASSIGNMENTS
PIN SIGNAL NAME FUNCTION
1 Cref Analog signal which programs output current from zero to full scale. Voltage or resistance programming
is selected via DIP switch position 2 (See Table 2-2). Refer to PAR. 3.7.3 for voltage programming and
3.7.2 for resistance programming.
2 RELAY_NO Connected to RELAY_COM (pin 4) for relay energized condition.
(1)
3 Vref Analog signal which programs output voltage from zero to full scale. Voltage or resistance program-
ming is selected via DIP switch position 1 (See Table 2-2). Refer to PAR. 3.7.3 for voltage programming
and 3.7.2 for resistance programming.
4 RELAY_COM Relay common.
(1)
5 Reserved.
6 VOLT_RBACK Analog signal which represents output voltage from zero to full scale. The full scale programming level
sets the full scale readback level (see PAR. 4.3.3).
7 CURR_RBACK Analog signal which represents output current from zero to full scale. The full scale programming level
sets the full scale readback level (see PAR. 4.3.3).
8
REM_INH Allows single signal to control output on/off. See PAR. 3.7.1.
0 = Output is off
1 = Output is on (default, no connection)
9 GND Ground
10 RELAY_NC Connected to RELAY_COM (pin 4) for relay not energized condition
(1)
11 GND Ground
12 ANALOG_CTRL Enables or disables analog programming (see PAR. 3.7).
1 = Analog programming disabled (default, no connection)
0 = Analog programming accepted (use jumper on mating connector to connect to pin 9, 11, 13 or 15
(ground).
13 GND Ground
14 EXT_TRG Performs same function as SCPI *TRG command if unit is programmed via digital remote mode. Tran-
sition from 1 (+5V) to 0 (ground) causes values established by VTRIG and CTRIG commands to
become VSET and CSET (see PAR. 3.3.1.3).
15 GND Ground
(1)
Internal relay may be configured to produce Fault signals at the users discretion. Refer to PAR. 3.2.11.3 to configure internal
relay.
Page 31
KLP-HV 073008 2-5
2.3 SOURCE POWER REQUIREMENTS
This power supply operates with the installed circuit breaker from either d-c or single phase a-c
mains power over the voltage and frequency ranges specified in Table 1-2 without adjustment
or modification.
2.4 COOLING
The power devices used within the power supply are maintained within their operating temperature range by means of internal heat sink assemblies cooled by three internal (d-c type) cooling
fans.
ALL INLET AND EXHAUST OPENINGS AT THE FRONT AND REAR OF THE POWER SUPPLY CASE MUST BE KEPT CLEAR OF OBSTRUCTION TO ENSURE PROPER AIR ENTRY
AND EXHAUST. Although not a requirement, it is recommended that side and top vent openings be clear of obstruction for more efficient cooling. Periodic cleaning of the power supply interior is recommended by authorized service personnel only (see KLP Service Manual for
instructions).
If the power supply is rack mounted, or installed within a confined space, care must be taken
that the ambient temperature, which is the temperature of the air immediately surrounding the
power supply, does not rise above the specified limits (see Table 1-2).
2.5 PRELIMINARY OPERATIONAL CHECK
A simple operational check after unpacking and before equipment installation is advisable to
ascertain whether the power supply has suffered damage resulting from shipping.
Refer to Figures 2-1 and 2-2 for location of operating controls and electrical connections. Table
2-1 explains the functions of operating controls and indicators.
NOTE: This test must be performed with IEEE 488, RS232, and ANALOG I/O ports discon-
nected, and ANALOG I/O SETTINGS switch positions 3 and 5 set to OFF.
1. With POWER circuit breaker set to OFF position, connect the power supply to source
power (see PAR. 2.7.2).
2. With no load connected, set POWER circuit breaker to the ON position. Each time the unit
is turned on an internal self-test is performed. After the test has been successfully completed, the unit displays the following:
• The status display flashes MODL (model) for two seconds while the DC VOLTS display
shows Eo
MAX
and the DC AMPERES display shows Io
MAX
. (E.g. for model 75-33-1200,
DC VOLTS reads 75 and DC AMPERES reads 33.)
• Then the status display flashes VIRT (Virtual model) for two seconds while the DC
VOLTS display shows Eo
MAX
and the DC AMPERES display shows the current corresponding to 1200W. (E.g. for model 75-33-1200, DC VOLTS reads 75 and DC
AMPERES reads 16.)
• Then the status display flashes PROT (protection limits) for two seconds while the DC
VOLTS display shows 120% of Eo
MAX
and the DC AMPERES display shows 120% of
current corresponding to 1200W. (E.g. for model 75-33-1200, DC VOLTS reads 90.0
and DC AMPERES reads 19.2.)
Page 32
2-6 KLP-HV 073008
• Then the status display reads SET (setpoint mode), the DC VOLTS display reads 0000
Volts, the DC AMPERES display reads minimum Amperes (see Note 1, below).
NOTES: 1. A minimum programmed current (actual value depends on model) is required to
ensure proper operation of the power supply under all load conditions. Programmed current is automatically set to be at least the minimum current.
2. If an error indication is blinking in the Status display, refer to Table 3-1 for an explanation of error codes.
3. Rotate VOLTAGE adjust knob clockwise. Verify that DC VOLTS display increases in large
(X 100) increments.
4. Press and rotate VOLTAGE adjust knob clockwise. Verify the DC VOLTS display increases
in finer increments than step 3.
5. Adjust VOLTAGE adjust knob clockwise until Status display reads >MAX. Tap either VOLT-
AGE or CURRENT adjust knob once to enter values. Verify Status display is blank
6. Connect a digital voltmeter (DVM) to the (M+) and (M–) terminals on the rear panel.
7. Press and release DC OUTPUT switch to enable the output. Verify DC OUTPUT indicator
lights.
8. Compare the programmed output voltage value (step 5) with the voltage reading of the
DVM; the difference between the two should not exceed 0.05% of the maximum voltage of
the unit.
9. Compare the voltage reading of the DC VOLTS display with that of the DVM; the difference
between the two should not exceed 0.1% of the maximum voltage of the unit.
10. Enter different value for output voltage, then repeat steps 8 and 9 using different values for
programmed voltage.
11. Disable the output by pressing and releasing DC OUTPUT switch; verify front panel DC
VOLTS and DC AMPERES displays read 0.0V and minimal current and the DC OUTPUT
indicator is off.
2.6 INSTALLATION
2.6.1 RACK MOUNTING
The unit is intended to be mounted directly in a 19-inch wide rack. Optional slides (see Table 1-
4) can be used.
2.7 WIRING INSTRUCTIONS
Interconnections between an a-c power source and the power supply, and between the power
supply and its load are as critical as the interface between other types of electronic equipment.
If optimum performance is expected, certain rules for the interconnection of source, power supply and load must be observed by the user. These rules are described in detail in the following
paragraphs.
Page 33
KLP-HV 073008 2-7
2.7.1 SAFETY GROUNDING
Local, national and international safety rules dictate the grounding of the metal cover and case
of any instrument connected to the a-c power source, when such grounding is an intrinsic part of
the safety aspect of the instrument.
KLP is provided with a three-terminal IEC appliance coupler for connection of the mains supply
source, one terminal of which is dedicated for the protective earthing conductor; no other ground
or earth connection is required, although the chassis may be separately connected to earth
ground for noise or other performance considerations (frame grounding).
The instructions below suggest wiring methods which comply with these safety requirements;
however, in the event that the specific installation for the power system is different from the recommended wiring, it is the customer's responsibility to ensure that all applicable electric codes
for safety grounding requirements are met.
2.7.2 SOURCE POWER
2.7.2.1 CURRENT RATING
All switchmode power supplies, including the KLP series, present a constant power characteristic to the input power source. Consequently, the power supply draws maximum input current for
a given load power at low input voltage, and proportionately less as source voltage is raised
according to the formula
Input Current = Output Power / (Efficiency x Input Voltage)
The input power circuit breaker of the power supply is rated to support rated load power under
worst-case efficiency conditions at the lowest rated source voltage (100V a-c), and provides the
necessary overload protection to the power supply's internal circuitry. The user must provide a
properly sized and rated mains lead (line cord) and service with a current rating compatible with
the anticipated input current. The Table 2-7 provides recommendations for service current rating and mains lead wire size for common a-c mains voltages.
For continuous operation at output power levels lower than 1000 watts, contact Kepco Applications Engineering for additional options.
2.7.2.2 CONNECTIONS
Source power is connected at the rear panel of the KLP power supply (see Figure 2-2) via the
IEC 320-style recessed power inlet connector, which provides interface to a three-wire safety
line cord via a polarized mating plug. A user-wirable mating connector is provided. Terminal
assignment follows internationally accepted conventions. It is the user's responsibility to ensure
that all applicable local codes for source power wiring are met. Kepco also makes a variety of
prefabricated safety line cord sets available for connecting KLP to source power via conventional box-mounted receptacles. Table 1-4 lists three popular cord set variants for North Ameri-
TABLE 2-7. INPUT CURRENT SERVICE RATING AND CONDUCTOR SIZES
MAINS VOLTAGE RANGE CURRENT SERVICE RATING CONDUCTOR SIZE
100 - 132V a-c 20 Amp #12AWG [2,0 mm²]
180 - 265V a-c 15 Amp #14AWG [3,0 mm²]
Page 34
2-8 KLP-HV 073008
can applications. For other options please contact Kepco Sales Engineering with specific
requirements.
IT IS IMPERATIVE THAT THE USER PROVIDE ALL THREE SOURCE WIRE CONNECTIONS, AS THIS CONNECTION IS THE SAFETY GROUND PROVISION!
2.7.3 D-C OUTPUT GROUNDING
Connections between the power supply and the load and sensing connections may, despite
precautions such as shielding, twisting of wire pairs, etc., be influenced by radiated noise, or
“pick-up”. To minimize the effects of this radiated noise the user should consider grounding one
side of the power supply/load circuit. The success of d-c grounding requires careful analysis of
each specific application, however, and this recommendation can only serve as a general
guideline.
One of the most important considerations in establishing a successful grounding scheme is to
avoid GROUND LOOPS. Ground loops are created when two or more points are grounded at
different physical locations along the output circuit. Due to the interconnection impedance
between the separated grounding points, a difference voltage and resultant current flow is
superimposed on the load. The effect of this ground loop can be anything from an undesirable
increase in output noise to disruption of power supply and/or load operation. The only way to
avoid ground loops is to ensure that the entire output/load circuit is fully isolated from ground,
and only then establish a single point along the output/load circuit as the single-wire ground
point.
The exact location of the “best” d-c ground point is entirely dependent upon the specific application, and its selection requires a combination of analysis, good judgement and some amount of
empirical testing. If there is a choice in selecting either the positive or negative output of the
power supply for the d-c ground point, both sides should be tried, and preference given to the
ground point producing the least noise. For single, isolated loads the d-c ground point is often
best located directly at one of the output terminals of the power supply; when remote error sensing is employed, d-c ground may be established at the point of sense lead attachment. In the
specific case of an internally-grounded load, the d-c ground point is automatically established at
the load.
The power supply output terminals (located on the rear panel) for KLP Power Supplies are d-c
isolated (“floating”) from the chassis in order to permit the user maximum flexibility in selecting
the best single point ground location. Output ripple specifications as measured at the output are
equally valid for either side grounded. Care must be taken in measuring the ripple and noise at
the power supply: measuring devices which are a-c line operated can often introduce additional
ripple and noise into the circuit.
There is, unfortunately, no “best” method for interconnecting the load and power supply. Individual applications, location and nature of the load require careful analysis in each case. It is hoped
that the preceding paragraphs will be of some assistance in most cases. For help in special
applications or difficult problems, consult directly with Kepco's Application Engineering Department.
WARNING
Page 35
KLP-HV 073008 2-9
2.7.4 POWER SUPPLY/LOAD INTERFACE
The general function of a voltage or current stabilized power supply is to deliver the rated output
quantities to the connected load. The load may have any conceivable characteristic: it may be
fixed or variable, it may have predominantly resistive, capacitive or inductive parameters; it may
be located very close to the power supply output terminals or it may be a considerable distance
away. The perfect interface between a power supply and its load would mean that the specified
performance at the output terminals would be transferred without impairment to any load,
regardless of electrical characteristics or proximity to each other.
The stabilized d-c power supply is definitely not an ideal voltage or current source, and practical
interfaces definitely fall short of the ideal. All voltage-stabilized power supplies have a finite
source impedance which increases with frequency, and all current-stabilized power supplies
have a finite shunt impedance which decreases with frequency. The method of interface
between the power supply output and the load must, therefore, take into account not only the
size with regard to minimum voltage drop, but the configuration with regard to minimizing the
impedance introduced by practical interconnection techniques (wire, bus bars, etc.). The series
inductance of the load wire must be as small as possible as compared to the source inductance
of the power supply: although the error sensing connection to the load compensates for the d-c
voltage drop in the power leads, it cannot completely compensate for the undesirable output
effects of the power lead inductance. These lead impedances (both power and sensing leads)
are especially important if the load is a) constantly modulated or step-programmed, b) has primarily reactive characteristics, or c) where the dynamic output response of the power supply is
critical to load performance.
2.7.5 LOAD CONNECTION - GENERAL
Load connections to the KLP power supply are achieved via the (+) and (–) DC OUTPUT terminals located on the rear panel; (+M) and (–M) outputs are also available at terminal blocks (TB5
and TB1, respectively) located on the panel for connection of external monitoring equipment
such as a DVM, oscilloscope, etc.
Configuration of local or remote sensing is facilitated by pre-installed jumpers which configure
the unit for local sensing.as shown in Figure 2-2.
NOTE: REGARDLESS OF OUTPUT CONFIGURATION, OUTPUT SENSE LINES MUST BE
CONNECTED FOR PROPER OPERATION, EITHER LOCALLY, OR AT THE LOAD
(REMOTE). OBSERVE POLARITIES: THE +S TERMINAL MUST BE CONNECTED
TO EITHER +M (LOCAL) OR +LOAD (REMOTE), AND THE –S TERMINAL MUST BE
CONNECTED TO EITHER –M (LOCAL) OR –LOAD (REMOTE).
2.7.5.1 LOCAL SENSING/REMOTE SENSING SELECT
Local sensing (factory default configuration) is established by connecting terminal TB4 (+S) to
TB5 (+M) and TB1 (–M) to TB2 (–S) (see Figure 2-2). The power supply is shipped with two
jumpers installed to obtain local sensing.
Remote sensing is established by first removing the factory-installed local sensing jumpers
between +S and +M and between –M and –S. The +S and –S lines must be connected at the
load (see Figure 2-3). A high frequency bypass network consisting of two capacitors connected
across the load as shown in Figure 2-3 is recommended to reduce noise in the sense loop.
Page 36
2-10 KLP-HV 073008
FIGURE 2-3. REMOTE SENSING
2.7.6 SERIES OPERATION
Units may be connected in series to obtain higher output voltages. Each power supply in the
series may be protected by a clamping diode connected in its non-conducting direction in parallel with the output. This diode protects the power supply outputs against secondary effects in the
event of a load short. (Note that this is NOT the same as the blocking diode used for parallel/
redundant operation.) Selection of the clamping diode is entirely dependent upon output voltage/current parameters. The clamping diode must be rated for the maximum voltage and current of the series connection. Several clamping diodes in parallel may be required to meet the
total current rating. The user must also respect the ±600V d-c maximum isolation from output to
chassis when determining the maximum series voltage. Figure 2-4 shows a series connection of
two KLP power supplies using remote sensing. Kepco strongly recommends that series applications employ master/slave control as described in PAR’s. 2.7.8 and 3.2.10.
2.7.7 PARALLEL/REDUNDANT OPERATION
Identical KLP power supply models may be connected in parallel in order to provided increased
output current to a common load (see Figure 2-5). This permits the user to obtain significantly
higher load ratings than for a single KLP power supply. The number of power supplies required
is determined by dividing the required load current by the current rating of the applicable KLP
model, and rounding up to the next whole number when necessary. KLP power supplies utilize
active current sharing circuitry to distribute the load current equally among the paralleled units.
Redundant operation is achieved by paralleling one or more power supplies than the minimum
number required to support the load; in this way, system operation is not compromised by the
failure of a single power supply. Any number of KLP power supplies (N+M) can be wired for
redundant operation as long as (N) power supplies can support the load, M representing the
total number of failed power supplies. When operating KLP power supplies in any parallel configuration, load sharing must be implemented among the paralleled modules. Kepco strongly
recommends that parallel/redundant applications employ master/slave control as described in
PAR’s. 2.7.8 and 3.2.10.
Page 37
KLP-HV 073008 2-11
FIGURE 2-4. SERIES CONNECTION USING REMOTE SENSING
FIGURE 2-5. PARALLEL CONNECTIONS USING REMOTE SENSING
Page 38
2-12 KLP-HV 073008
2.7.7.1 LOAD SHARING
When operating two or more power supplies in parallel, either for capacity or redundancy, it is
desirable to distribute the load equally among all of the power supplies in order to improve performance, reduce stress and increase reliability. KLP power supplies incorporate active circuitry
which forces multiple power supplies wired in parallel to share load current, both in voltage- and
current-mode regulation. The KLP employs a single wire connection between paralleled power
supplies, forming a master-slave relationship as follows: the highest voltage unit becomes the
master, and all of the remaining units are slaved to it via the current share signal (CS, available
at the rear panel terminal A3TB3, Figure 2-2), which boosts the slave outputs in order to
increase load share. A maximum boost limit prevents the slave units from following a defective
master into an overvoltage condition, or from creating a load hazard if either the slave itself or
the load sharing system is defective.
When implementing load sharing, the user must ensure that all power supplies are attempting to
regulate to the same voltage at the same location, and must minimize the possibility of load
share signal corruption; the power supplies should, as nearly as possible, emulate a single large
power supply. To this end, the following rules apply:
a. If possible, remote error sensing should be employed, with all error sensing connections ter-
minated at the same physical point, and as close to the power supplies as possible; if local
error sensing is required, power lead voltage drops must be minimized. Provide local noise
decoupling capacitors across all sense wire termination points.
b. The power supplies should be located as near to each other as possible, with power termina-
tions bussed together using adequately sized interconnections; the power supply/load interconnections should be distributed evenly along the power supply output interconnection busses. This is especially important in high-current systems employing several power supply
modules in parallel, where voltage drops in the interface connections can be significant in
comparison to the load share signal voltage and introduce both d-c and a-c errors.
c. All power supply output voltages should be adjusted as closely as possible, and in any case
within a 1% error band. Additionally, the current limit setpoints should be identical and high
enough to support the load requirements; for (N+M) systems, this means setting the current
limits high enough to tolerate loss of M power supplies and still support the load.
d. Minimize the current share signal wire interconnection lengths to reduce risk of noise influ-
ence.
2.7.8 MASTER/SLAVE CONFIGURATIONS
Master/slave configurations of power supply pairs can be used to allow changes to output voltage/current of one supply (master) to affect the output of the other (slave). Both units of a master/slave configuration must be identical models. Master/slave control is implemented using the
RS 232 ports. After connecting the series or parallel pair (see PAR. 2.7.6 or 2.7.7, respectively),
use a null modem cable, minimum length 1 foot, DB9F-DB9F, to connect the RS 232 ports of
both power supplies. Then refer to PAR. 3.2.10 to complete the setup of each power supply in
the master/slave configuration.
2.7.9 ANALOG I/O CONNECTIONS
The Analog I/O Port connector, located on the rear panel of the KLP power supply (see Figure
2-2), provides access for all analog programming inputs and status signal outputs. In addition,
an external trigger input is available for use with SCPI *TRG and TRIG commands. Refer to
Table 2-6 for analog I/O programming signal pin assignments and descriptions.
Page 39
KLP-HV 073008 2-13/(2-14 Blank)
These signals must be protected from radiated and conducted noise as well as from physical
contact with non-valid driving sources. The following subsections address specific programming
signal applications; in general, however, when accessing this connector from distant locations
or high-noise environments, it is recommended that a shielded cable be used, with the shield
terminated to the system's single point ground.
a. Analog Programming Enable (ANALOG_CTRL)
Connect pin 12 (Analog Control) to pin 9, 11, 13, or 15 (ground) to enable analog I/O programming.
b. External Voltage and Current Programming (V_Ref and C_Ref)
Twist the voltage programming signal V_Ref (pin 3), Current Programming signal C_Ref (pin
1) and ground (pin 9, 11, 13, or 15). Configure Analog I/O switch positions 1 and 2 to use
either voltage or resistance as the programming source. Factory default for full scale output
is 10V or 10 Kohms (see par. 4.3.3 to set lower values for full scale output).
c. Voltage and Current Readback (VOLT_RBACK and CURR_RBACK)
Twist the voltage readback signal VOLT_RBACK (pin 6), Current readback signal
CURR_RBACK (pin 7) together with ground (pin 9, 11, 13, or 15). Full scale readback voltages are identical to selected full scale programming voltages (see PAR. 4.3.3).
d. Remote Inhibit (REM_INH)
Twist remote inhibit (pin 8) together with ground (pin 9, 11, 13, or 15).
e. Fault Connections (RELAY_NC, RELAY_COM, RELAY_NO
It is recommended that normally open and normally closed relay signals RELAY_NC (pin 10)
and/or RELAY_NO (pin 2), respectively, be twisted together with RELAY_COM (pin 4) as
needed to eliminate noise pickup. See PAR. 3.2.11.3 to configure internal relay.
f. External Trigger (EXT_TRIG)
External Trigger may be used with the SCPI TRIG commands (see PARs. B.6 through B.8,
B.43, B.55, and B.93) during digital remote operation. For noise suppression it is recommended that wires from EXT_TRIG, pin 14 and ground (pin 9, 11, 13, or 15) be twisted
together. The external trigger function is only active when set to “EXT” (see PAR. B.93). See
PAR. 3.3.1.3 for additional information.
2.7.10 INTERNAL RELAY CONFIGURATION
By using the UTIL menu from the front panel (see PAR. 3.2.11.3), the internal relay contacts
available at pins 6, 7 and 8 of the Analog I/O connector can be configured to operate in one of
three different ways.
• FLT mode (factory default) - the relay energizes upon detection of a system fault. This
mode gives the user three options:
NORM - the relay energizes only upon detection of a fatal system fault,
V->C - In additon to energizing upon detection of a fatal system fault, the relay also
energizes if the unit changes from constant voltage to constant current mode).
C->V - In additon to energizing upon detection of a fatal system fault, the relay also
energizes if the unit changes from constant current to constant voltage mode.
NOTE: For V->C and C->V options a delay (from 0.5 to 128 seconds, factory default is
1.0 second) may be programmed before the relay is energized.
• MANUAL mode - The relay is energized (ON) or de-energized (OFF) at the users discretion from the front panel using the UTIL menu or by sending SCPI commands.
• LIST mode - The relay is energized (ON) or de-energized (OFF) as part of a user-specified program using the LIST commands.
Page 40
Page 41
KLP073008 3-1
SECTION 3 - OPERATION
3.1 GENERAL
This section explains how to operate the KLP Power Supply. Series KLP feature three modes of
operation:
• Local Mode: This is the default operating mode, providing full access to all programming
and readback functions via front panel displays, controls, and indicators (see PAR. 3.2).
• Digital Remote Mode (see PAR. 3.3): This mode is selected via commands transmitted
through one of the two digital ports. One port is configured for IEEE-488 (GPIB) (see
PAR. 3.5), while the other port is configured to accept commands based on RS-232 protocol (see PARs. 3.4).
• Analog Remote Mode: This mode is selected via a jumper wire at the analog programming port prior to initial turn-on, and provides limited access to programming and readback functions (see PAR. 3.7).
3.2 LOCAL MODE OPERATION
Local operation of the KLP Power Supply is accomplished via the front panel switches and controls illustrated in Figure 2-1 and described in detail in Table 2-1. Separate 4-digit LEDs display
actual output voltage and current. as well as set points and limits. Status and fault indications
are provided by a 4-character alpha-numeric display
3.2.1 TURNING THE POWER SUPPLY ON
1. To turn the power supply on, set POWER ON/OFF circuit breaker (1, Figure 2-1) to ON.
2. When the power supply is turned on, it performs a self-test and displays the following information:
NOTE: To eliminate the display of model, virtual model, and protection levels on power-up,
refer to PAR. 3.2.11.4 for quick boot.
• status display flashes MODL for 2 seconds while DC VOLTS and DC AMPERES displays show the maximum voltage and current capability of the unit.
• status display flashes VIRT for 2 seconds while DC VOLTS and DC AMPERES displays show the maximum voltage and current allowed for a previously programmed virtual model.
NOTE: To reprogram the maximum allowable voltage and/or current, refer to PAR. 3.2.5
to define a virtual model.
• Status display flashes PROT for 2 seconds while DC VOLTS and DC AMPERES dis-
plays show previously stored OVP and OCP trigger levels. NOTE: to reprogram OVP
or OVC, refer to PAR. 3.2.7.
• If an error occurs, an error code is displayed in the status display (see Table 3-1).
3. After a successful self test, the default conditions upon power up are as follows:
• Status display shows SET,
Page 42
3-2 KLP073008
• output is disabled (green DC OUTPUT indicator is off). If remote analog mode is
selected (PAR. 3.7), output is enabled unless Remote Inhibit, pin 8 of the Analog I/O
Connector (see Figure 2-2 and Table 2-6) is grounded.
• DC VOLTS and DC AMPERES displays show programmed output conditions: either 0
Volts, minimum Amperes (see NOTE, PAR. 3.2.1) or, if DIP switch position 3 enabled
(see Table 2-2), previously saved setpoint values in effect upon power off.
NOTE: A minimum programmed current is required to ensure proper operation of the power
supply under all load conditions. Programmed current is automatically set to be at least
the minimum current (actual value depends on model, see Table 1-1).
• Since the output is off, Constant Voltage (CV) mode indicator (green LED) and Constant Current (CC) indicator (amber LED) are off.
3.2.2 SETTING LOCAL/REMOTE MODE
LOCAL MODE. When the power supply is turned on, it is automatically set to Local mode as
long as Analog I/O port pin 12 is not grounded. In local mode the Status display is normally
blank.
DIGITAL REMOTE MODE. The power supply will automatically go into digital remote mode
when digital remote commands are accepted via the GPIB or RS232 ports. In digital remote
mode the power supply normally shows dRem in the status display. When in digital remote
mode, all front panel controls are disabled. If desired, local mode can be restored by pressing
both VOLTAGE and CURRENT controls simultaneously; the power supply will then remain in
local mode until another digital command is received, causing the unit to return to remote digital
mode. To disable local mode entirely, see PAR. 3.2.2.1 for front panel lockout.
TABLE 3-1. POWER-UP BUILT-IN TEST ERROR CODES
ERROR CODE MEANING
E310
System Error
E313
Calibration Memory Error
E315
Configuration Memory Error
E341
Memory Error (CRC)
E330
Self Test Error
Ecal
Calibration Error - The unit will try to restore the previous calibration.
Eclp
Previous Calibration Error - After detecting a Calibration Error (Ecal) and trying to use
the previous calibration, an error was detected, and the unit will attempt to restore the
factory calibration.
Eclf
Factory Calibration Error - The unit has failed to restore the factory calibration after
failing to restore the previous calibration. The unit will not operate after this error has
been displayed and must be referred for service.
NOTE: During power-up the power supply performs detailed software check sequences. If a failure is detected during power-up, the DC VOLTS and DC AMPERES displays are blanked and the Status display shows an error code.
For errors that occur after power-up, refer to Appendix B, Table B-4 for typical error codes and possible causes. For
these and all other error codes, refer to authorized service personnel for corrective action.
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KLP073008 3-3
NOTE: During both LOCAL and DIGITAL REMOTE operation, the analog readback signals
(voltage and current) remain available, as does the remote inhibit signal; only programming signals are disregarded.
ANALOG REMOTE: With power supply turned off, ground Analog I/O port pin 12. Refer to PAR.
2.7.9 to configure the Analog I/O Port; refer to Table 2-2 to configure the Analog I/O switch.
When the power supply is turned on, the status display shows aRem (Analog Remote programming selected). The unit will accept Analog Remote commands (see PAR. 3.7) and front panel
controls are disabled except that the POWER ON/OFF circuit breaker is operational. Local
mode can be restored by pressing the VOLTAGE and CURRENT controls at the same time.
Once local mode has been restored, analog remote programming is disabled until the unit is
powered off, then on again. Digital queries are accepted while Analog Remote programming is
active; digital commands are not accepted except for the front panel unlock command (see
PAR. 3.2.2.1).
3.2.2.1 REMOTE WITH LOCAL (FRONT PANEL) LOCKOUT
To prevent unauthorized setting of the power supply to Local mode, a local lockout mode can be
enabled which prevents the power supply from being restored to local mode via the front panel.
With the power supply turned off, set the ANALOG I/O DIP switch, position 5 (see Table 2-2) to
ON. Now when the power supply is turned on the status display will read aRwl.(Remote with
Local Lockout).
Once the front panel is locked, it can only be unlocked by either of the following:
• turn the power supply off, set ANALOG I/O DIP switch position 5 to OFF, and then
power up again.
• send the following SCPI command via GPIB or RS232 port:
SYST:KLOC OFF
NOTE: If the front panel is unlocked by SCPI command, the unit will be set to Remote
with Local Lockout when it is turned on again. Set ANALOG I/O DIP switch position 5 to OFF to disable Remote with Local Lockout.
3.2.3 ENABLING/DISABLING OUTPUT POWER
When the power supply is turned on, the output is automatically disabled (DC OUTPUT LED is
off) and the DC VOLTS and DC AMPERES displays show the programmed output voltage and
current set points. If remote analog mode is selected (PAR. 3.7), output is enabled on power up
unless Remote Inhibit, pin 8 of the Analog I/O Connected (see Figure 2-2 and Table 2-6) is
grounded.
To enable the output, first exit SET mode by tapping either the VOLTAGE or CURRENT control,
then press and release the DC OUTPUT switch. The associated green LED lights to indicate
output power is applied to the load. Each time you exit SET mode, the setpoint values are
stored for possible recall if the power supply is turned off (see PAR. 3.2.6.3) or the output is disabled.
To disable the output, press and release the DC OUTPUT switch again. The DC OUTPUT indicator goes off.
While in the setpoint mode (Status display reads SET) the output cannot be turned on (pressing
DC OUTPUT has no effect). If output was on while setpoint mode was entered, pressing DC
OUTPUT will disable the output.
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3.2.4 CHECKING VOLTAGE/CURRENT SETPOINTS
CAUTION: WHEN THE OUTPUT IS DISABLED, THE DC VOLTS AND DC AMPERES DIS-
PLAYS SHOW THE ACTUAL OUTPUT VOLTAGE AND CURRENT. BEFORE
ENABLING THE OUTPUT ALWAYS CHECK THE SETPOINTS TO AVOID POSSIBLE DAMAGE TO THE LOAD.
Check the voltage and current set points by tapping either the VOLTAGE or CURRENT control.
The status display reads SET, and the DC VOLTS and DC AMPERES displays show the stored
setpoints.
To accept the displayed value, tap the associated adjustment control again. To change the
value, rotate the control (press the control in while rotating for fine adjustment), then tap the
adjustment control again to accept the new setting.
NOTE: Before changing the setpoint, note the displayed setpoint. If you decide not to change
the value after rotating the control, you must rotate the control to the value noted, then
tap the adjustment control to accept.
3.2.5 DEFINING A VIRTUAL MODEL
The virtual model is defined by establishing a maximum programmable voltage and current for
the unit within the 1200W power limitation and the maximum voltage and current ratings listed in
Table 1-1. Once established, the unit will not accept programmed values beyond these values
whether from the front panel in local mode, or from the digital (GPIB, or RS232) or analog input
ports in remote mode. The virtual model settings are password-protected (see PAR. 4.5).
NOTE: Decreasing full scale voltage and/or current does not improve programming resolution.
A multitude of possible 1200W power supplies may be emulated by defining the maximum voltage and current. For example, some of the possible power supplies that a KLP 36-48-1200 can
emulate are: 36V, 33A (1200W), 25V, 48A (1200W), 30V, 40A (1200W), 35V, 30A (1050W).
Refer to Table 1-1 and Figure 1-2 for the acceptable operating regions for each model. Units
without the -1200 suffix can be also be configured to reject programming values that exceed
user-defined limits, however the maximum output power of 1200 Watts can only be achieved at
the rated maximum values of voltage and current.
Whenever a virtual model is set, overvoltage and overcurrent protect limits (see PAR. 3.2.7) are
reset to 120% of the new maximum value. Also, if position 3 of the Analog I/O DIP switch is set
to recall previous setpoint values upon power-up (see Table 2-2 and PAR. 3.2.6.3), the previous
setpoint value is cleared so that the initial powerup after changing the virtual model will be at 0V,
minimum A. In addition, the following parameters should be checked to ensure that there are no
settings outside the range permitted by the new maximum programmable voltage and current:
• User-programmed sequences (see PAR. 3.3.1.1)
• Storage of User-programmed Active Settings (see PAR. 3.3.1.1)
• User-determined output Sequences (see PAR. 3.3.1.2)
• External Triggers: VOLT:TRIG and CURR:TRIG values (see PAR. 3.3.1.3).
• Sequences programmed using LIST commands.
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KLP073008 3-5
To define a virtual model, proceed as follows. (To establish a virtual model using SCPI commands, use VOLT:LIM:HIGH (see PAR. B.49) and CURR:LIM:HIGH (see PAR. B.37), respectively.)
1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)
2. . Using a thin tool (e.g., a paper clip), press the FUNCTION switch repeatedly until the status
display reads VIRT. The DC VOLTS and DC AMPERES displays show the programmed
maximum voltage and current of the virtual model. To exit without changing the virtual
model, continue to press FUNCTION until Status display is blank. To change the values proceed to step 3.
3. Press the DC OUTPUT switch once. The status display shows PASS (password) (see PAR.
4.5) and the Current Display shows 0000. Rotate CURRENT control to select a number from
0-9. Tap CURRENT control to advance to next digit. Repeat this process until all four digits
have been selected. Tap DC OUTPUT switch to accept the number. When the password is
accepted, the status display reads VIRT; proceed to step 4.
4. Rotate VOLTAGE and CURRENT controls until desired values appear in DC VOLTS and
DC AMPERES displays. Pressing and holding the control in while turning provides a finer
adjustment resolution. Under no conditions will the power supply accept limits beyond its
maximum ratings of voltage and current. For models with -1200 suffix, as the primary parameter is increased, the power supply will automatically decrement the secondary parameter as
necessary to maintain maximum output power at 1200 Watts. Maximum current shown on
DC AMPERES display is automatically limited to 1200W maximum.
5. Press DC OUTPUT switch to accept virtual model settings. The unit displays done, then
resets and repeats the power on sequence, showing the new virtual model parameters while
the status display flashes VIRT. Then the default protection limits (based on selected virtual
model settings) are displayed while the status display shows PROT. Last, the unit is placed
in setpoint mode with the voltage and current displays reset to 0 volts, minimum amps.
NOTE: Accepting a new virtual model resets the setpoints to zero Volts and minimum
Amperes (see NOTE, PAR. 3.2.1) and resets the OVP and OCP values to 120% of virtual model maximum. If DIP switch position 3 is enabled, stored values of voltage and
current are cleared when the virtual model settings are saved.
3.2.6 SETTING VOLTAGE OR CURRENT
The VOLTAGE and CURRENT controls adjust output voltage and current limit, respectively,
when the unit is in constant voltage (CV) mode and adjust voltage limit and output current,
respectively, when the unit is in constant current (CC) mode. The mode (CV or CC) is determined by the load together with the programmed settings. As long as the voltage across the
load produces a current that is less than the programmed Current setpoint, the unit operates in
CV mode (voltage programmed to voltage setpoint, current limited by current setpoint). If the
load changes to the point that current through the load reaches the current setpoint, the unit
automatically enters CC mode (current programmed to current setpoint, voltage limited by voltage setpoint).
Output voltage or current can be set at the front panel in two ways: Real-time adjustment (PAR
3.2.6.1) or Setpoint adjustment (PAR. 3.2.6.2).
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3.2.6.1 REAL-TIME VOLTAGE/CURRENT ADJUSTMENT
Rotating the associated control will change the output voltage or current in real-time only if the
output is enabled. If the unit is in constant voltage mode (CV indicator lit) the DC VOLTS display
shows the actual output voltage as the VOLTA G E control is rotated. Similarly, if the unit is in
constant current mode (CC indicator lit) the DC AMPERES display shows the actual output current as the CURRENT control is rotated.
NOTE: If the unit is in CV mode, rotating the CURRENT control will affect the current limit even
though the DC AMPERES display does not change since it is showing actual output
current. Similarly, rotating the VOLTAGE control while in CC mode affects the voltage
limit. To change the limits to a precise value, refer to PAR. 3.2.6.2, Setpoint Adjustment.
3.2.6.2 SETPOINT ADJUSTMENT
NOTE: Before changing the setpoint, note the displayed setpoint. If you decide not to change
the value after rotating the control, you must manually reset the value to its original
value using the following procedure.
Tap either the VOLTAGE or CURRENT control to initiate setpoint adjustment (status display
reads SET). The previous setpoint is visible on the corresponding DC VOLTS or DC AMPERES
display.
1. Rotate the corresponding control to change the setpoint as viewed on the corresponding
LED display. Tap the adjustment control again to accept the new setting.
2. In the setpoint mode, both coarse (rotate the control) and fine (rotate while pressing control
in) adjustment is available. The coarse adjustment is approximately 100X the fine adjustment resolution.
Setpoint adjust can be done with output either on or off, however the output can not be enabled
while setpoint is active (See PAR. 3.2.3).
3.2.6.3 LAST SETTING RECALL
KLP is capable of saving the last setpoint values for voltage and current prior to unit shutdown,
and recalling them when the unit is next turned on. Enable this function prior to power-up by setting Analog I/O Switch 3 to the ON (down) position (see Table 2-2 and Figure 2-2). Upon next
power-up, each setpoint entry for voltage and current is stored in non-volatile memory, with latest settings displacing prior ones. When the power supply is turned off, the last settings are
saved and automatically retrieved at next power-up as the starting setpoints. Note that this function applies to setpoint entries only (see PAR 3.2.6.2); output changes entered in real-time
mode (PAR 3.2.6.1) are not saved. To disable this function, turn the unit off and set Analog I/O
Switch 3 to the OFF (up) position; at next power-up, the stored value buffer is cleared and setpoints will default to zero volts and minimum current.
NOTE: If the virtual model for the power supply is altered, the last settings are reset to zero volts
and minimum current.
3.2.7 VIEWING/CHANGING OVERVOLTAGE OR OVERCURRENT PROTECTION VALUES
Overvoltage and Overcurrent protection values can be individually programmed. The range for
overvoltage and overcurrent values are 0.2 to 1.2 x E
O
max, 0.6 to 1.2 x IOmax. If the output volt-
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KLP073008 3-7
age/current exceeds the overvoltage/overcurrent protection value, the protection circuit latches
the output off, flashes an overvoltage (OVP) or overcurrent (OCP) error message on the status
display and sets a status bit that can be retrieved through the RS 232 or GPIB port. The unit
must be cycled on and off to restore the output. The N.O. and N.C. contacts of the relay provide
status flags via the Analog I/O port connector. The maximum values are 1.2 x E
O
max for over-
voltage protection, and 1.2 x I
O
max for overcurrent protection.
A built-in feature prevents the unit from being programmed within 20% of OVP or 20% of OVC.
For example, if OVP and OVC are set to 12V and 72A, respectively, programming of the output
is automatically limited to 10V and 60A.
NOTE: When a virtual model is defined (PAR. 3.2.5), OVP and OVC are automatically set 20%
and 20%, respectively, above the maximum programmable values established by the
virtual model.
The OVP and/or OVC limits can be changed as follows:
1. Using a thin tool (e.g., end of paper clip), press and hold the PROTECT switch. The output is
switched off, setting voltage to zero Volts, and current to a minimal value, and the status display shows PROT. The DC VOLTS and DC AMPERES displays show the corresponding
overvoltage and overcurrent protection setpoints while the PROTECT switch is held in.
2. To change the values, operate the corresponding adjustment control while holding the PRO-
TECT switch in. When the PROTECT switch is released, the protection values showing in
the DC VOLTS and DC AMPERES displays are entered as the new protection values.
NOTE: If either adjustment exceeds maximum programmable volts or amps, or if the adjustment
is within 20% of OVP or 20% of OCP, the status display will show >MAX.
3.2.8 CHANGING GPIB ADDRESS
The factory default GPIB address is 6. To change the address from the front panel proceed as
follows:
1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)
2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch repeatedly until the status
display reads ADDR; the active GPIB address is visible in the DC AMPERES display. To
change the address, proceed to step 2.
3. Rotate the CURRENT control to change the GPIB address.
4. Tap the DC OUTPUT switch to accept the displayed GPIB address. The unit advances to the
next function, Baud Rate, see PAR. 3.2.9.
3.2.9 CHANGING RS232 BAUD RATE
The factory default RS232 baud rate is 9600. To change the baud rate from the front panel proceed as follows:
1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)
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3-8 KLP073008
2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch repeatedly until the status
display reads BAUD; the active baud rate is visible in the DC AMPERES display (value
shown must be multiplied by 1000; e.g., 9600 is displayed as 9.6). To change the baud rate,
proceed to step 2, otherwise, press FUNCTION to exit.
3. Rotate the CURRENT control to change the baud rate.
4. Tap the DC OUTPUT switch to accept the displayed baud rate. The unit advances to the
next function, Virtual Model, see PAR. 3.2.5.
3.2.10 SETTING UP MASTER/SLAVE CONFIGURATIONS
Both units of a master/slave pair must be identical models. After connecting the RS 232 ports
(see PAR. 2.7.8), proceed as follows to configure the individual units to be master or slave.
3.2.10.1 CONFIGURE POWER SUPPLY AS MASTER
1. Turn power on. If the unit comes up in setpoint mode (see PAR. 3.2.4), tap either the CURRENT or VOLTAGE controls to take the unit out of setpoint mode (status display goes from
SET to blank).
2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch repeatedly until the status
display reads M/S.
3. Tap the DC OUTPUT switch once.
• The status display reads either SERI (series) or PARA (parallel).
•The DC VOLTS display shows the number assigned to the unit (1 = master, 2 or above
= slave).
•The DC AMPERES display shows the maximum number of units in the configuration.
• The factory default is standalone operation (DC VOLTS and DC AMPERES show 1).
4. Specify either SERI (series configuration for higher voltage) or PARA (parallel configuration
for higher current) using either the VOLTAGE or CURRENT control by holding in and rotat-
ing the control. Both connected units must be set the same, either SERI or PARA.
5. Specify the total number of units in the configuration to 2 by rotating the CURRENT control.
6. Specify the unit number to be assigned (1 = master) by rotating the VOLTAGE control.
7. Press DC OUTPUT to accept the displayed settings, or FUNCTION to abort and proceed to
the next function.
NOTE: Until both units are configured properly, the displays will cycle as follows: status display
will flash E241 (hardware error), then DC VOLTS, status display and DC AMPERES
flash x OF y where x = unit number and y = total number of units, the status display
flashes the type of connection SERI (series) or PARA (parallel).
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KLP073008 3-9
3.2.10.2 CONFIGURE POWER SUPPLY AS SLAVE
1. Turn power on. If the unit comes up in setpoint mode (see PAR. 3.2.4), tap either the CURRENT or VOLTAGE control to take the unit out of setpoint mode (status display goes from
SET to blank).
2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch repeatedly until the status
display reads M/S.
3. Tap the DC OUTPUT switch once.
• The status display reads either SERI (series) or PARA (parallel).
•The DC VOLTS display shows the number assigned to the unit (1 = master, 2 or above
= slave).
•The DC AMPERES display shows the maximum number of units in the configuration.
• The factory default is standalone operation (DC VOLTS and DC AMPERES show 1).
4. Specify either SERI (series configuration for higher voltage) or PARA (parallel configuration
for higher current) to be the same as the master by holding in either the VOLTA G E or CUR-
RENT control and rotate the control. Both connected units must be set the same, either
SERI or PARA.
5. Specify the total number of units in the configuration to 2 by rotating the CURRENT control.
6. Specify the unit number to be assigned ( 2 = slave) by rotating the VOLTAGE control.
7. Press DC OUTPUT to accept the displayed settings, or FUNCTION to abort and proceed to
the next function.
NOTE: Until both units are configured properly, the displays will cycle as follows: status display
will flash E241 (hardware error), then DC VOLTS, status display and DC AMPERES
flash x OF y where x = unit number and y = total number of units, the status display
flashes the type of connection SERI (series) or PARA (parallel).
3.2.10.3 OPERATING THE MASTER/SLAVE CONFIGURATION
Once the master is configured, it searches for the slave specified. Until the slave is set up properly, the master status display will cycle as follows: status display will flash E241 (hardware
error), then DC VOLTS, status display and DC AMPERES flash x OF y where x = unit number
and y = total number of units, the status display flashes the type of connection SERI (series) or
PARA (parallel). When the slave is found, the status display of the slave reads SLVE and the DC
VOLTS and DC AMPERES displays on the slave go blank. For the master/slave combination to
work properly the number of slave units specified in the master (PAR. 3.2.10.1, step 5) must be
found.
When the slave has been found, the master proceeds with the normal turn-on sequence and the
unit proceeds to SET mode. The master front panel readouts show the total values for set point,
voltage and current readback, virtual model (the virtual model and protection settings of the
slave are automatically programmed to be the same as the master) and protection settings for
the master/slave configuration. All controls on the slave are disabled. The parallel or series
combination is controlled from the master using either the front panel, SCPI commands, or analog control.
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3-10 KLP073008
• If analog control is used, only the master is configured for analog control (the slave is
controlled digitally by the master).
• If Remote Inhibit is used, it should only be connected to the master.
• If E241 (hardware error) is showing in the status display, the FUNCTION switch can be
used to change the configuration
• If there is no communication between units for approximately 10 seconds, all units will
turn off their output and the status display will flash E241 (hardware error), then xOFy
where x = unit number and y = total number of units, and finally the serial/parallel configuration setting SERI or PARA.
3.2.11 UTILITY FUNCTION
The Utility Function provides additional system information or access to special functions.
These are:
• VERS - Display System Firmware Version (see PAR. 3.2.11.1)
• MODL - Display Model (see PAR. 3.2.11.2)
• RELY - Relay Control
• QkBT - Quick Boot
• INVC - Analog Input Voltage and Current A to D calibration voltages (see PAR. 3.2.11.5)
• LBT - Loop Back Test used to isolate RS 232 communication problems (see PAR.
3.4.2.4.
• CAL - Display last calibration date and/or begin Calibration (see PAR. 3.2.11.6)
1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)
2. Using a thin tool (e.g., a paper clip), press the FUNCTION switch repeatedly until the status
display shows UTIL. Press the DC OUTPUT switch to enter the UTIL Menu.
3. Rotate either the VOLTAGE or CURRENT control in either direction to select the function as
identified in the status display as listed above (clockwise selects the functions in the order
described below, counterclockwise reverses the order).
3.2.11.1 DISPLAY SYSTEM FIRMWARE VERSION
Enter UTIL menu and rotate either VOLTAGE or CURRENT control until status display reads
VERS (see PAR. 3.2.11).
•The DC VOLTS display identifies whether the firmware is the factory shipped firmware
(Pri displayed) or field updated firmware (SEC displayed).
•The DC AMPS display shows the firmware version.
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KLP073008 3-11
3.2.11.2 DISPLAY MODEL
Enter UTIL menu and rotate either VOLTAGE or CURRENT control until status display reads
MODL (see PAR. 3.2.11).
•The DC VOLTS display shows the model voltage rating (e.g, 75 for KLP 75-33-1200).
•The DC AMPS display shows the model current rating (e.g, 33 for KLP 75-33-1200).
3.2.11.3 RELAY CONTROL
Enter UTIL menu and rotate either VOLTAGE or CURRENT control until status display reads
RELY (see PAR. 3.2.11). Press DC OUTPUT switch to enter Relay Control menu.
•The DC VOLTS display indicates whether the relay is currently ON (energized) or OFF
(deenergized).
• Rotate either VOLTAGE or CURRENT control to see the available relay control modes
in the status display. The list of modes in the order they appear are:
FLT (factory default) - Relay is set to energize automatically upon detection of one of
three preselected conditions:
NORM: (factory default) relay energizes immediately upon detection of a system
(fatal) error:
V->C: relay energizes immediately upon detection of a system (fatal) error and,
after a user-programmable delay, the relay energizes upon a transition
from constant voltage (CV) to constant current (CC) mode.
C->V: relay energizes immediately upon detection of a system (fatal) error and,
after a user-programmable delay, the relay energizes upon a transition
from constant current (CC) to constant voltage (CV) mode.
MAN - Relay on/off is controlled manually, directly from the front panel (see below).
LIST - Relay on/off is controlled remotely using LIST commands via GPIB or RS 232
interface (see PARs. B.10 and B.11).
1. To select mode rotate either VOLTAGE or CURRENT control until status display reads FLT
(factory), MAN (manual), or LIST. Then press DC OUTPUT switch to save selection. Pro-
ceed to step 2 if FLT is selected, proceed to step 4 if MAN is selected, otherwise skip to step
5.
2. If FLT is selected, rotate VOLTAGE or CURRENT control to select NORM, V->C, or C->V. in
the status display. If NORM is selected, press the DC OUTPUT switch to save selection and
skip to step 5. If V->C, or C->V is selected, proceed to step 3.
3. While V->C or C->V is in the status display, the DC AMPERES display shows the delay in
seconds, from 000.5 to 128.0: NNND, where NNN is an integer from 0 to 128 and D will be
either .0 or .5 (000.0 is not permitted). The delay determines the length of time that the unit
must be operating in the new mode before energizing the relay.
The factory default delay time is set to 1.0 seconds to prevent false tripping of the relay during application of output power to low impedance or highly reactive loads. If false tripping
occurs, this delay may be increased as needed.
To change the delay, press in and rotate either the VOLTAGE or CURRENT control; release
the control when the desired delay is showing in the DC AMPERES display. Press the DC
OUTPUT switch to save selection and skip to step 5.
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3-12 KLP073008
NOTE: Once the relay turns on in V->C or C->V mode, the relay will go off again when the
unit transitions back to the original mode, or when the output is turned off.
4. When the relay control mode is set to MAN, the DC VOLTS display shows whether the relay
is ON or OFF. To change the state of the relay press in and rotate either VOLTAGE or CUR-
RENT control until the desired relay state is displayed, then release the control. Press the
DC OUTPUT switch to immediately set the relay to the selected state.
5. Press the DC OUTPUT switch to exit relay control and advance to the next item in the UTIL
menu.
NOTE: If a SYSTem:SECurity:IMMediate command is issued, the above relay control settings
are reset to the factory default: FLT - NORM.
3.2.11.4 QUICK BOOT
Enter UTIL menu and rotate either VOLTAGE or CURRENT control until status display reads
QkBT - Quick Boot (see PAR. 3.2.11). If Quick boot is ON, then the next time the unit is powered
up it will go directly to setpoint mode (status display reads SET, see PAR. 3.2.6) without display-
ing MODL,VIRT, and PROT settings.
•The DC VOLTS display indicates whether quick boot is ON or OFF.
1. Press in and turn either VOLTAGE or CURRENT control until the desired quick boot state is
displayed,
2. Press DC OUTPUT switch to save. The program then advances to the next item in the UTIL
menu.
3.2.11.5 ANALOG INPUT FULL SCALE CALIBRATION
Enter UTIL menu and rotate either VOLTAGE or CURRENT control until status display reads
INVC (see PAR. 3.2.11).
•The DC VOLTS display shows the analog input voltage value that produces the full
scale output voltage established by the virtual model.
•The DC AMPS display shows the analog input voltage value that produces the full scale
output current established by the virtual model.
1. To change the settings tap the DC OUTPUT switch.
2. Rotate VOLTAGE control to set the analog voltage value required to produce the full scale
output voltage (for fine adjustment press in VOLTAGE control and hold while rotating).
3. Rotate the CURRENT control to set the analog voltage value required to produce the full
scale output current (for fine adjustment press in CURRENT control and hold while rotating).
4. Tap the DC OUTPUT switch to accept the new settings or use a thin tool (e.g., a paper clip)
to press the FUNCTION switch to cancel the operation.
3.2.11.6 CALIBRATION
Enter UTIL menu and rotate either VOLTAGE or CURRENT control until status display reads
CAL (see PAR. 3.2.11).
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KLP073008 3-13
•The DC VOLTS display shows the month and day of the active calibration date.
•The DC AMPS display shows the year of the active calibration date.
Tap the DC OUTPUT switch to proceed to the system calibration (see PAR 4.3).
3.3 DIGITAL REMOTE MODE PROGRAMMING USING SCPI COMMANDS
KLP Power Supplies may be programmed over a control bus using SCPI (Standard Commands
for Programmable Instruments). SCPI provides a common language conforming to IEEE 488.2
for instruments used in an automatic test system. The control bus used must be either the IEEE
488 standard communication bus (General Purpose Interface Bus, GPIB) (see PAR. 3.5) or the
RS232C bus (see PAR. 3.4). Refer to Table 2-3 for GPIB port and Table 2-4 for RS232
input/output signal allocations. All power supply functions available from the front panel can be
programmed via remote commands, as well as some that are not available from the front panel
(see PAR. 3.3.1).
This section includes a discussion of functions available only using digital remote programming
(PAR. 3.3.1), GPIB bus protocols (PAR. 3.5), instructions for changing the GPIB address (PAR.
3.5.1), a discussion of the VISA (Virtual Instrumentation Software Architecture) driver supplied
with the unit (PAR. 3.5.2), followed by an introduction to SCPI programming (PAR. 3.6).
3.3.1 ADDITIONAL FUNCTIONS AVAILABLE VIA DIGITAL REMOTE PROGRAMMING
Digital Remote Programming is accomplished through SCPI programming (PAR. 3.6). The following paragraphs summarize the functions available using the SCPI subsystems described in
PAR. 3.6.3. For complete details regarding digital commands and queries, refer to Appendix A
(IEEE 488.2 Commands/Queries) and Appendix B (SCPI Commands/Queries).
3.3.1.1 STORAGE OF USER-PROGRAMMED ACTIVE SETTINGS
The KLP Power Supply contains 40 memory locations that can be used to store active settings.
Values are stored in the nonvolatile memory using the *SAV command (see Appendix A, PAR.
A.11), and are retained when the unit is turned off. The active settings can then be restored by
issuing the *RCL command (see Appendix A, PAR. A.9). These setting are cleared when a calibration is performed.
If a virtual model setting (maximum voltage or current, see PAR. 3.2.5) is changed, and a stored
setting is outside the range established by the new virtual model, the following occurs: when the
setting is recalled, the stored value is reset to the default minimum (zero V or minimum A) and
an error message notes that the requested value is out of range.
3.3.1.2 USER-DETERMINED OUTPUT SEQUENCES
Using the LIST commands (see Appendix B), up to 100 locations are available for programming
the KLP output. These locations enable the user to program the output using multiple command
sequences which may be initiated by a single command. The repeatable user-determined
sequences are stored in volatile memory and are retained until reprogrammed, the power supply is turned off, a calibration is performed, or a LIST:CLEar command is received. If a virtual
model setting (maximum voltage or current, see PAR. 3.2.5) is changed, and a programmed
value is outside the range established by the new virtual model, the following occurs: when the
program is executed, the programmed value is reset to the default minimum (zero V or minimum
A) and an error message notes that the requested value is out of range.
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Each location defines values for the active channel (either output voltage or output current), a
dwell time duration (between 0.010 and 655.36 seconds) for the programmed settings, and the
state of the internal relay. By programming the output to change in small increments, complex
outputs can be generated. Figure B-2 illustrates the use of the LIST commands to output a usergenerated sequence from the KLP.
NOTES: 1. When programming sequential voltage levels, it is important to set the Overvoltage
to accommodate the highest voltage of the sequence. Otherwise, when going from
higher to lower voltage levels, the overvoltage protection will trip and shut down the
unit because the overvoltage setting registers faster than the power supply can
attain the lower voltage.
2. To operate the internal relay using the LIST commands, first configure the internal
relay to LIST (see PAR. 3.2.11.3), then use the LIST:CONtrol command (see
PAR. B.10) to control the relay.
3.3.1.3 EXTERNAL TRIGGERING
If external trigger mode is selected, grounding the EXT_TRG line (J2 pin 14 to pin 9, 11, 13 or
15) creates the trigger event at which time the trigger values (preset values VOLT:TRIG and
CURR:TRIG) will become the setpoint values (Vset and Cset) for the power supply. Refer to
PARs. A.15, B.43, B.55, and B.93. The VOLT:TRIG and CURR:TRIG values are reset to the
default minimum (zero V or minimum A) when the unit is calibrated
If a virtual model setting (maximum voltage or current, see PAR. 3.2.5) is changed, and a trigger
level is outside the range established by the new virtual model, the following occurs: when the
unit is triggered, the VOLT:TRIG or CURR:TRIG value is reset to the default minimum and an
error message notes that the requested value is out of range.
3.3.1.4 INTERNAL RELAY CONFIGURATION
The internal relay contacts available at pins 6, 7 and 8 of the Analog I/O connector can be configured from the front panel to operate in either Fault, Manual or List mode (see PAR. 3.2.11.3
for details). If FAULT mode (the factory default) is selected, the relay energizes automatically
upon detection of a condition: defined as either a) NORM (normal), a (fatal) system fault, b) V-
>C, when the unit transitions from Constant Voltage (CV) to Constant Current (CC) mode, or c)
C->V, when the unit transitions from CC to CV mode. If V->C (or C->V) is selected, the amount
of time the unit must be in CC (or CV) mode before the relay energizes may be programmed
using the SCPI command OUTP:PROT:DEL (see PAR. B.33).
3.4 RS232-C OPERATION
The KLP Power Supply may be operated via an RS232-C terminal, or from a PC using a terminal emulation program. The KLP is considered data terminal equipment (DTE), as are most controllers and computers. Communications between KLP, considered data terminal equipment
(DTE), and data communications equipment (DCE), e.g. a modem, requires a patch cable, or
one with a pin-for-pin relationship between terminating connectors. A null modem cable is necessary for nearly all applications, with the exception of those in which the RXD and TXD line
transposition is accomplished via external hardware (e.g. older Apple MAC computers with Dsub serial port).
Baud rate may be changed from the front panel (see PAR. 3.2.9). All RS 232 parameters may
be changed using SCPI commands (see Appendix B) as follows: for baud rate, refer to PAR’s
B.68 and B.69; for prompt, refer to PAR’s B.76 and B.77; refer to PAR’s B.68 and B.69; for
echo, refer to PAR’s B.70 and B.71; for XON/XOFF, refer to PAR’s B.72 and B.73. The default
settings are as follows:
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KLP073008 3-15
• Baud rate: 9600
• Parity: None
•Data Bits8
• Stop Bits 1
•Echo OFF
• XON ON (enabled) NOTE: Kepco strongly recommends the XON XOFF method
for data transfer via RS 232 protocol for all Kepco products. If this method is
not selected, it is the user's responsibility to ensure completion of any
response by the power supply prior to issuance of subsequent commands.
3.4.1 SERIAL INTERFACE
The serial interface behaves like the GPIB interface in that the command is parsed after receiving a control character of either a Line Feed or Carriage Return. The serial interface supports six
special control characters. The six special control characters are:
Escape (1B
H
) Causes the input buffer to be cleared. This character is used to ensure
that the buffer is empty when the host powers on since it is possible
that the KLP Power Supply was previously powered on and received
some characters prior to the initialization of the host computer.
Backspace (08
H
) Causes the last character in the input buffer to be removed from the
input buffer queue.
Carriage Return (0D
H
) Causes the input buffer to be parsed by the KLP Power Supply.
Line Feed (0A
H
) Causes the input buffer to be parsed by the KLP Power Supply.
> (3E
H
) and < (3CH) The > character turns on the echo mode upon receipt of the character.
The < character turns off the echo mode. The message “echo off“ or
“echo on“ will be displayed to confirm this.
3.4.2 RS 232 IMPLEMENTATION
The following paragraphs are provided to help the user understand how the RS 232 serial interface is implemented in the KLP Power Supply. Since the RS 232 protocol does not use a parity
bit, the echo mode is the default method used to ensure reliable communication between the
command originator (computer) and the KLP Power Supply, thus avoiding a more complex
“handshake” protocol.
Upon initial application of source power to the KLP input, or after restoration of source power following an interruption, the power supply will return the identification string described in Appendix A, PAR. A.6, to the host controller. This indicates that the KLP is initialized and ready to
accept programming commands.
When the KLP Power Supply is in the RS 232 echo mode it returns all data received from the
host controller. The KLP Power Supply provides two additional options that allow handshake
communication: the Prompt method and the XON XOFF method. In standard echo mode the
controller must verify that each character is echoed back by the KLP. As shown in Figure 3-1,
there are times when the KLP does not echo back the character from the controller, requiring
that the controller resend the character. By using the handshake options (prompt and XON
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3-16 KLP073008
XOFF) the host controller can ensure that serial data interrupts occurring after parsing of the
incoming message do not result in lost data.
Figure 3-1 illustrates the default echo mode, the prompt method and the XON XOFF method
described in the following paragraphs.
Only four control characters (characters between 00
H
and 1FH) are acknowledged by the power
supply:
• Carriage Return (CR, 0D
H
)
• Line Feed (LF, 0A
H
)
• Back Space (BS, 08
H
)
• Escape (ESC, 01B
H
)
BS deletes the last character entered, with the exception of CR or LF characters. Either the CR
or LF character acts as the line terminator, initiating parsing of the ASCII data sent to the KLP
Power Supply by the command originator. When the line is parsed, the KLP sends the line terminator sequence CR LF to the command originator.
The ESC character is used for synchronization, causing the KLP Power Supply to reset its input
buffer and return a CR LF sequence.
FIGURE 3-1. RS 232 IMPLEMENTATION
3.4.2.1 ECHO MODE
Echo mode is the default method of ensuring data is transferred without errors. Each byte (character) is echoed back to the sender where it is verified as the same character that was just sent.
If the character is incorrect or missing, the sender sends the character again until the correct
character is verified as having been received.
All non-control characters are sent via the serial port of the command originator. The control
character BS is echoed as BS Space BS. Only the first control character is returned in response
to either a CR LF or LF CR character sequence (see Figure 3-1).
3.4.2.2 PROMPT METHOD
The command originator sends a message line (command) to the KLP Power Supply and waits
until the prompt sequence CR LF > is received. The KLP sends the prompt sequence CR LF >
to the command originator indicating the power supply is ready to receive the next command so
that data will not be lost. The prompt method is similar to the echo method described above,
except that the command originator does not have to compare each character and repeat any
characters dropped. The operation of the KLP is identical for echo mode and prompt mode;
implementation of prompt mode is at the command originator.
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KLP073008 3-17
3.4.2.3 XON XOFF METHOD
The XON XOFF method allows the KLP Power Supply to control when the command originator
is allowed to send data. The command originator can only send data after the XON (transmission on) character (011
H
) has been received; the command originator stops sending data after
receiving the XOFF (transmission off) character (013
H
), and waits until the XON character is
received before sending additional data.
Control characters, either CR or LF, are returned as XOFF CR if echo mode is on, and as XOFF
if echo mode is off. XOFF stops data from the command originator and the KLP returns the normal sequence of CR LF (if echo mode is enabled).
3.4.2.4 ISOLATING RS 232 COMMUNICATIONS PROBLEMS
A Loop Back test can be run from the KLP front panel to aid in isolating RS 232 communications
problems.
1. With the power supply in local mode, if the status display shows SET, tap either the CUR-
RENT or VOLTAGE controls to take the unit out of setpoint mode (status display goes from
SET to blank)
2. Use a thin tool (e.g., a paper clip), to press the FUNCTION switch repeatedly until the status
display shows UTIL. Press the DC OUTPUT switch to enter the Utilities menu. Rotate either
the VOLTAGE or CURRENT control until the status display shows LBT (Loop Back Test). At
this point the VOLTS display will show ----.
3. With the power supply's RS 232 port open (no connections), press the DC OUTPUT switch
once to run the test. The VOLTS display should show FAIL; if it reads PASS, the power supply is defective and requires repair.
4. Install the loop-back test connector (195-0112, see Table 1-4) at the RS 232 port, located on
the rear panel of the power supply (J3, Figure 2-2). (If the loop back test connector is not
available, install a jumper from pin 2 to pin 3 of the RS 232 port connector.) Press the DC
OUTPUT switch once to rerun the test. The VOLTS display should now read PASS; if it reads
FAIL, the power supply is defective and requires repair.
5. To test the integrity of the cable assembly connecting the power supply RS 232 port to the
computer, remove the loop back test connector or jumper and connect the cable in its place.
Install a jumper wire from pin 2 to pin 3 at the opposite end of the cable and repeat the test of
(step 4) above. If the VOLTS display reads FAIL, the cable is either the improper type (not
null modem) or defective. If the VOLTS display reads PASS, the cable is correct. Remove the
jumper and reconnect the cable to the computer.
6. To exit the utilities menu, press the FUNCTION switch repeatedly until the status display is
blank.
If each of the above steps is completed successfully, the problem lies in the computer hardware and/or software. Refer to the Product Support area of the Kepco website for additional
information regarding RS 232 Communications problems: www.kepcopower.com/support.
3.5 IEEE 488 (GPIB) BUS PROTOCOL
Table 3-2 defines the interface capabilities of the KLP power supply (Talker/Listener) relative to
the IEEE 488 (GPIB) bus (reference document ANSI/IEEE Std 488: IEEE Standard Digital Interface
for Programmable Instrumentation) communicating with a Host Computer—Controller (Talker/Lis-
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tener). Tables 3-3 and 3-4 define the messages sent to the KLP, or received by the KLP, via the
IEEE 488 bus in IEEE 488 command mode and IEEE 488 data mode, respectively. These messages are enabled during the “handshake” cycle, with the KLP power supply operating as either
a Talker or a Listener.
3.5.1 CHANGING THE GPIB ADDRESS
See PAR. 3.2.8.
TABLE 3-2. IEEE 488 (GPIB) BUS INTERFACE FUNCTIONS
FUNCTION
SUBSET
SYMBOL
COMMENTS
Source Handshake SH1 Complete Capability (Interface can receive multiline messages)
Acceptor Handshake AH1 Complete Capability (Interface can receive multiline messages)
Talker T6 Basic talker, serial poll, unaddress if MLA (My Listen Address) (one-byte address)
Listener L4 Basic listener, unaddress if MTA (My Talk Address) (one-byte address).
Service Request SR1
Complete Capability. The interface sets the SRQ line true if there is an enabled service
request condition.
Remote/Local RL1
Complete capability. Interface selects either local or remote information. In local mode
the KLP executes front panel commands, but can be set to remote mode via IEEE 488
bus. When in Remote mode all front panel keys are disabled except LOCAL. LOCAL key
can be disabled using keypad lockout command (see Appendix B, PAR. B.81) so that
only the controller or a power on condition can restore Local mode.
Parallel Poll PP0 No Capability
Device Clear DC1 Complete Capability. KLP accepts DCL (Device Clear) and SDC (Selected Device Clear).
Device Trigger DT1 Respond to *TRG and <GET> trigger functions.
Controller C0 No Capability
TABLE 3-3. IEEE 488 (GPIB) BUS COMMAND MODE MESSAGES
MNEMONIC
MESSAGE
DESCRIPTION
COMMENTS
DCL Device Clear Received
GET Group Execute Trigger Received
GTL Go To Local Received
IFC Interface Clear Received
LLO Local Lockout Received
MLA My Listen Address Received
MTA My Talk Address Received
OTA Other Talk Address Received (Not Used)
RFD Ready for Data Received or Sent
SDC Selected Device Clear Received
SPD Serial Poll Disable Received
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KLP073008 3-19
3.5.2 KLP VISA INSTRUMENT DRIVER
The VISA instrument driver simplifies programming with a VISA compatible GPIB controller. and
Includes 1) source code (C) for all VISA functions, and 2) a complete programming reference
manual which can be used to program one or more KLP power supplies using a virtual front
panel observed on a computer monitor.
Download the latest VISA driver from the Kepco website at
http://www.kepcopower.com/drivers.htm
Although the software drivers supplied by Kepco are VISA compliant, they also require the
installation of the proper 16-bit VISA driver from your GPIB card supplier. Many vendors supply
this software with the hardware; National Instruments (http://www.natinst.com) has the driver for
their cards available on the internet at a file transfer site (ftp://ftp.natinst.com — find the folder
for support and VISA drivers). The driver to be installed is the win16 driver, even if your system
is running under Windows 95 or Windows NT.
3.6 SCPI PROGRAMMING
SCPI (Standard Commands for Programmable Instruments) is a programming language conforming to the protocols and standards established by IEEE 488.2 (reference document
ANSI/IEEE Std 488.2, IEEE Standard Codes, Formats, Protocols, and Common Commands). SCPI
commands are sent to the KLP Power Supply as ASCII output strings within the selected programming language (PASCAL, BASIC, etc.) in accordance with the manufacturer’s requirements for the particular GPIB controller card used.
Different programming languages (e.g., BASIC, C, PASCAL, etc.) have different ways of representing data that is to be put on the IEEE 488 bus. It is up to the programmer to determine how
to output the character sequence required for the programming language used. Address information (GPIB address) must be included before the command sequence. (See PAR.3.5.1 to
establish the KLP Power Supply GPIB address.)
SPE Serial Poll Enable Received
SRQ Service Request Sent
UNL Unlisten Received
UNT Untalk Received
TABLE 3-4. IEEE 488 (GPIB) BUS DATA MODE MESSAGES
MNEMONIC MESSAGE DESCRIPTION COMMENTS
DAB
Data Byte Received or Sent
END
End Received or Sent
EOS
End of String Received or Sent
RQS
Request Service Sent
STB
Status Byte Sent
TABLE 3-3. IEEE 488 (GPIB) BUS COMMAND MODE MESSAGES (CONTINUED)
MNEMONIC
MESSAGE
DESCRIPTION
COMMENTS
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3.6.1 SCPI MESSAGES
There are two kinds of SCPI messages: program messages from controller to power supply,
and response messages from the power supply to the controller. Program messages consist of
one or more properly formatted commands/queries and instruct the power supply to perform an
action; the controller may send a program message at any time. Response messages consist of
formatted data; the data can contain information regarding operating parameters, power supply
state, status, or error conditions.
3.6.2 COMMON COMMANDS/QUERIES
Common commands and queries are defined by the IEEE 488.2 standard to perform overall
power supply functions (such as identification, status, or synchronization) unrelated to specific
power supply operation (such as setting voltage/current). Common commands and queries are
preceded by an asterisk (*) and are defined and explained in Appendix A. Refer also to syntax
considerations (PARs 3.4.3 through 3.4.6).
3.6.3 SCPI SUBSYSTEM COMMAND/QUERY STRUCTURE
Subsystem commands/queries are related to specific power supply functions (such as setting
output voltage, current limit, etc.) Figure 3-3 is a tree diagram illustrating the structure of SCPI
subsystem commands used in the KLP Power Supply with the “root” at the left side, and specific
commands forming the branches. The following paragraphs introduce the subsystems; subsystem commands are defined and explained in Appendix B.
3.6.3.1 ABORT SUBSYSTEM
This subsystem allows pending trigger levels to be cancelled.
3.6.3.2 DISPLAY SUBSYSTEM
This subsystem returns the character string displayed in the Status display.
3.6.3.3 TRIGGER SUBSYSTEM
This subsystem enables the trigger system. When an internal trigger is enabled, the triggering
action will occur upon receipt of a GPIB <GET>, *TRG or TRIGger command. When an external
trigger is enabled, the triggering action occurs when a ground is applied to J2, pin 14. If a trigger
circuit is not enabled, all trigger commands are ignored.
3.6.3.4 LIST SUBSYSTEM
The LIST subsystem is represented by the 100 memory locations (groups of settings) which are
stored in the volatile memory. Each setting contains values for: Current, Voltage, Dwell, and
Relay. The range for the first two values is the maximum available range for the specific power
supply. The range for the dwell time is between 0.01 and 655.36 seconds. If the relay is configured to LIST (see PAR. 3.2.11.3), it can be set to 1 (on, energized) or 0 (off, de-energized).
3.6.3.5 MEASURE SUBSYSTEM
This query subsystem returns the voltage and current measured at the power supply's output
terminals.
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KLP073008 3-21
3.6.3.6 OUTPUT SUBSYSTEM
This subsystem controls the power supply's voltage and current outputs
3.6.3.7 STATUS SUBSYSTEM
This subsystem programs the power supply status register. The power supply has two groups of
status registers: Operation and Questionable. Each group consists of three registers: Condition,
Enable, and Event.
3.6.3.8 SYSTEM SUBSYSTEM
This subsystem controls the RS 232 port, GPIB address, passwords, security, language, keyboard lockout, and compatibility with older Kepco equipment.
3.6.3.9 [SOURCE:]VOLTAGE AND [SOURCE:]CURRENT SUBSYSTEMS
These subsystems program the output voltage and current of the power supply.
3.6.3.10 CALIBRATE SUBSYSTEM
The KLP series of power supplies support software calibration. A full calibration consists of a
voltage calibration and a current calibration. Both voltage and current calibrations consist of a
zero and a full scale calibration. There are two ways to perform the calibration: locally using the
front panel keys, or remotely sending commands through the GPIB bus. These two ways cannot
be combined.
In order to enter the calibration mode the correct calibration access code (password) must be
entered. If the password has been forgotten call the factory and a secret password (which has
been assigned to your power supply) will be provided. During the calibration, new calibration
data is computed which is than stored in the non volatile memory.
The equipment required for calibration is specified in PAR. 4.2.
Because the voltage measured will be used as reference for calibration, the DVM itself must be
calibrated accurately. During voltage calibration, the voltage, overvoltage and voltage readback
are calibrated and during current calibration the current, overcurrent and current readback are
calibrated. The normal procedure is to calibrate voltage first and then current. However, you do
not have to do a complete calibration each time. If required, you may calibrate only the voltage
or the current and then proceed to saving the calibration results. For voltage calibration all loads
must be disconnected and the sense terminals connected to the corresponding output terminals. The digital voltmeter will be connected to the output of the power supply. For current calibration after disconnecting all loads an appropriate shunt resistor will be connected across
output terminals and the digital voltmeter will be connected across the sense terminals of the
shunt resistor.
3.6.4 PROGRAM MESSAGE STRUCTURE
SCPI program messages (commands from controller to power supply) consist of one or more
message units ending in a message terminator (required by Kepco power modules). The message
terminator is not part of the syntax; it is defined by the way your programming language indicates the end of a line (“newline” character). The message unit is a keyword consisting of a single command or query word followed by a message terminator (e.g., CURR?<newline> or
TRIG<end-of-line>). The message unit may include a data parameter after the keyword sepa-
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rated by a space; the parameter is usually numeric (e.g., CURR 5<newline>), but may also be a
string (e.g., OUTP ON<newline>). Figure 3-2 illustrates the message structure, showing how
message units are combined. The following subparagraphs explain each component of the
message structure.
NOTE: An alternative to using the message structure for multiple messages defined in the fol-
lowing paragraphs is to send each command as a separate line. In this case each command must use the full syntax shown in Appendix B.
3.6.4.1 KEYWORD
Keywords are instructions recognized by a decoder within the KLP, referred to as a “parser.”
Each keyword describes a command function; all keywords used by the KLP are listed in Figure
3-3.
Each keyword has a long form and a short form. For the long form the word is spelled out completely (e.g. STATUS, OUTPUT, VOLTAGE, and TRIGGER are long form keywords). For the
short form only the first three or four letters of the long form are used (e.g., STAT, VOLT, OUTP,
and TRIG). The rules governing short form keywords are presented in Table 3-5.
You must use the rules above when using keywords. Using an arbitrary short form such as
ENABL for ENAB (ENABLE) or IMME for IMM (IMMEDIATE) will result in an error. Regardless
of which form chosen, you must include all the letters required by that form.
To identify the short form and long form in this manual, keywords are written in upper case letters to represent the short form, followed by lower case letters indicating the long form (e.g.,
IMMediate, EVENt, and OUTPut). The parser, however, is not sensitive to case (e.g., outp,
OutP, OUTPUt, ouTPut, or OUTp are all valid).
3.6.4.2 KEYWORD SEPARATOR
If a command has two or more keywords, adjacent keywords must be separated by a colon (:)
which acts as the keyword separator (e.g., CURR:LEV:TRIG). The colon can also act as a root
specifier (paragraph 3.4.4.7).
3.6.4.3 QUERY INDICATOR
The question mark (?) following a keyword is a query indicator. This changes the command into
a query. If there is more than one keyword in the command, the query indicator follows the last
keyword. (e.g., VOLT? and MEAS:CURR?).
TABLE 3-5. RULES GOVERNING SHORTFORM KEYWORDS
IF NUMBER OF LETTERS IN
LONGFORM KEYWORD IS:
AND FOURTH LETTER
IS A VOWEL?
THEN SHORT FORM
CONSISTS OF:
EXAMPLES
4 OR FEWER (DOES NOT MATTER) ALL LONG FORM LETTERS MODE
5 OR MORE
NO
THE FIRST FOUR
LONG FORM LETTERS
MEASure, OUTPut, EVENt
YES
THE FIRST THREE
LONG FORM LETTERS
LEVel, IMMediate, ERRor
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KLP073008 3-23
3.6.4.4 DATA
Some commands require data to accompany the keyword either in the form of a numeric value
or character string. Data always follows the last keyword of a command or query (e.g.,
VOLT:LEV:TRIG 14 or SOUR:VOLT? MAX
3.6.4.5 DATA SEPARATOR
Data must be separated from the last keyword by a space (e.g., VOLT:LEV:TRIG 14 or
SOUR:VOLT? MAX
FIGURE 3-2. MESSAGE STRUCTURE
3.6.4.6 MESSAGE UNIT SEPARATOR
When two or more message units are combined in a program message, they must be separated
by a semicolon (;) (e.g., VOLT 15;MEAS:VOLT? and CURR 12; CURR:TRIG 12.5).
3.6.4.7 ROOT SPECIFIER
The root specifier is a colon (:) that precedes the first keyword of a program message. This
places the parser at the root (top left, Figure 3-3) of the command tree. Note the difference
between using the colon as a keyword separator and a root specifier in the following examples:
VOLT:LEV:IMM 16 Both colons are keyword separators.
:CURR:LEV:IMM 4 The first colon is the root specifier, the other two are keyword separators.
VOLT:LEV 6;:CURR:LEV 15 The second colon is the root specifier, the first and third are keyword separators
:INIT ON;:TRIG;:MEAS:CURR?;VOLT? The first three colons are root specifiers.
CURR:LEV 3.5;:OUTP ON;:CURR?<NL>
MESSAGE TERMINATOR
KEYWORD
QUERY INDICATOR
ROOT SPECIFIER
MESSAGE UNIT SEPARATOR
DATA
KEYWORD
KEYWORD
EYWORD SEPARATOR
KEYWORD
MESSAGE UNIT SEPARATOR
DATA
MESSAGE UNIT
DATA SEPARATOR
DATA SEPARATOR
ROOT SPECIFIER
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3.6.4.8 MESSAGE TERMINATOR
The message terminator defines the end of a message. One message terminator is permitted:
• new line (<NL>), ASCII 10 (decimal) or 0A (hex)
NOTE: Kepco power supplies require a message terminator at the end of each program mes-
sage. The examples shown in this manual assume a message terminator will be added
at the end of each message. Where a message terminator is shown it is represented
as <NL> regardless of the actual terminator character.
3.6.5 UNDERSTANDING THE COMMAND STRUCTURE
Understanding the command structure requires an understanding of the subsystem command
tree illustrated in Figure 3-3. The “root” is located at the top left corner of the diagram. The
parser goes to the root if:
• a message terminator is recognized by the parser
• a root specifier is recognized by the parser
Optional keywords are enclosed in brackets [ ] for identification; optional keywords can be omitted and the power supply will respond as if they were included in the message. The root level
keyword [SOURce] is an optional keyword. Starting at the root, there are various branches or
paths corresponding to the subsystems. The root keywords for the KLP Power Supply are
:ABORt, :CALibrate, :DISPlay, :INITiate, :LIST, :MEASure, :OUTPut, [:SOURce], :STATus,
:SYSTem and :TRIGger. Because the [SOURce] keyword is optional, the parser moves the path
to the next level, so that VOLTage, CURRent, and FUNCtion commands are at the root level.
Each time the parser encounters a keyword separator, the parser moves to the next indented
level of the tree diagram. As an example, the STATus branch is a root level branch that has
three sub-branches: OPERation, PRESet, and QUEStionable. The following illustrates how
SCPI code is interpreted by the parser:
STAT:PRES<NL>
The parser returns to the root due to the message terminator.
STAT:OPER?;PRES<NL>
The parser moves one level in from STAT. The next command is expected at the level defined
by the colon in front of OPER?. Thus you can combine the following message units
STAT:OPER? and STAT:PRES;
STAT:OPER:COND?;ENAB 16<NL>
After the OPER:COND? message unit, the parser moves in one level from OPER, allowing the
abbreviated notation for STAT:OPER:ENAB.
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KLP073008 3-25
FIGURE 3-3. TREE DIAGRAM OF SCPI COMMANDS USED WITH KLP POWER SUPPLY
ABORt subsystem
ABORt
CALibrate subsystem
CALibrate
:CEXTernal
:CGAin
:CURRent
:LEVel (MIN | MAX, ZERO)
[:DATA] val
:DATA
:DPOT
:SAVE <date> optional
:STATe <boolean> ,password
:STATe?
:VEXTernal
:VGAin
:VOLTage
:LEVel (MIN | MAX, ZERO)
[:DATA] val
:ZERO
DISPlay subsystem
DISPlay
[:WINDow]:TEXT[:DATA]?
OUTPut subsystem
OUTPut
[:STATe] ON or OFF
[:STATe]?
[:STATe]:PROTect:DELay
[:STATe]:PROTect:DELay?
TRIGger subsystem
TRIGger
[:IMMediate]
:CONTinuous bool
:CONTinuous?
:SOUR BUS | EXT
ROOT : (colon)
STATus subsystem
STATus
:OPERation
:CONDition?
:ENABle val
:ENABle?
[:EVENt]?
:PRESet
:QUEStionable
:CONDition?
:ENABle val
:ENABle?
[:EVENt]?
:VOLTage
:CONDition?
:ENABle val
:ENABle?
:[:EVENt]?
:CURRent
:CONDition?
:ENABle val
:ENABle?
:[:EVENt]?
MEASure subsystem
MEASure
[:SCALar]:CURRent[:DC]?
[:SCALar]:[VOLTage][:DC]?
LIST subsystem
LIST
:CLE
:CONT
:CONT?
:COUN
:SKIP
:SKIP?
:COUN?
:CURRent
[:LEVel] val
[:LEVel]?
:POINt?
:DIR
:DIR?
:DWELl
:DWELl?
:POINt?
:QUERy
:QUERy?
:VOLTage
[:LEVel] val
[:LEVel]?
:POINt?
[SOURce:] subsystem
[SOURce:]
VOLTage
[:LEVel]
[:IMMediate]
[:AMPLitude] val
[:AMPLitude]? MIN, MAX
:TRIGgered
[:AMPLitude] val
[:AMPLitude]? MIN, MAX
:MODe (FIX | LIST | TRAN)
:MODe? FIXED, LIST TRAN
:PROTection
:PROTection? MIN, MAX
:LIMit
:HIGH val
:HIGH? MIN, MAX
CURRent
[:LEVel]
[:IMMediate]
[:AMPLitude] val
[:AMPLitude]? MIN, MAX
:TRIGgered
[:AMPLitude] val
[:AMPLitude]? MIN, MAX
:MODe (FIX | LIST | TRAN)
:MODe? FIXED, LIST TRAN
:PROTection
:PROTection? MIN, MAX
:LIMit
:HIGH val
:HIGH? MIN, MAX
FUNC:MODE
FUNC:MODE?
SYSTem subsystem
SYSTem
:COMM
:GPIB:ADDR val
:GPIB:ADDR?
:SER:BAUD val
:SER:BAUD?
:SER:ECHO
(0 | 1)
:SER:ECHO?
:SER:ENAB
(0 | 1)
:SER:ENAB?
:SER:PACE (NONE | XON)
:SER:PACE?
:SER:PROM (0 | 1)
:SER:PROM?
:ERRor
[:NEXT]?
:CODE?
[:NEXT]?
:ALL?
:KLOCk <boolean>
:KLOCk?
:LANGuage(SCPI |
COMPatibility)
:PASSword
[:CENable] (code)
:STATe?
:CDISable (code)
:NEW <oldpass>,
<newpass>
:SECUrity
:IMMediate
:SET
:SET?
:STAT?
:VERSion?
MEASure subsystem
MEASure
[:SCALar]:CURRent[:DC]?
[:SCALar]:[VOLTage][:DC]?
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3.6.6 PROGRAM MESSAGE SYNTAX SUMMARY
• Common commands begin with an asterisk (*).
• Queries end with a question mark (?).
• Program messages consist of a root keyword and, in some cases, one or more message units separated by a colon (:) followed by a message terminator. Several message units of a program message may be separated by a semicolon (;) without
repeating the root keyword.
• If a program message has more than one message unit, then a colon (:) must precede
the next keyword in order to set the parser back to the root (otherwise the next keyword will be taken as a subunit of the previous message unit).
e.g., the command meas:volt?;curr? will read output voltage and output current
since both volt? and curr? are interpreted as subunits of the meas command.
• Several commands may be sent as one message; a line feed terminates the message.
Commands sent together are separated by a semicolon (;). The first command in a
message starts at the root, therefor a colon (:) at the beginning is not mandatory. e.g.,
the command meas:volt?;:curr? will read output voltage and programmed current
since the colon preceding curr? indicates that curr? is not part of the meas command
and starts at the root.
• UPPER case letters in mnemonics are mandatory (short form). Lower case letters may
either be omitted, or must be specified completely (long form)
e.g., INSTrument (long form) has the same effect as INST (short form).
• Commands/queries may be given in upper/lower case (long form)
e.g., SoUrCe is allowed.
• Text shown between brackets [ ] is optional.
e.g., :[SOUR]VOLT[:LEV] TRIG has the same effect as :VOLT TRIG
3.6.7 STATUS REPORTING
The status reporting of the KLP power supply follows the SCPI and IEEE 488.2 requirements.
The serial poll response of the KLP power supply provides summary bits of the status and error
reporting system. The simplest status report is the command valid reporting and data availability, This successful decoding of a command string generates no error and is indicated by the bit
3 of the serial poll response being a zero. The setting of bit 4 in the status byte indicates data is
available to the controller in response a command query message.
3.6.7.1 STATUS REPORTING STRUCTURE
The status reporting of the KLP uses four status registers, illustrated in Figure 3-4. These registers are the Questionable, Operation, Standard Event and Service Request registers. The
Questionable and Operation registers are 16 bit registers and the Standard Event and Service
Request registers are 8 bits. These four registers are referred to as condition registers. Each of
the four condition registers is associated with two related registers: an event register which
holds unlatched events reported in real-time by the instrument and is cleared by reading the
register, and an enable register which allows the contents of the event register to be passed
through to set the associated condition register.
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KLP073008 3-27
A zero to one transition of a condition register is added to the event register if the specific bit in
the enable register is also a 1. Reading an event register clears all of the bits found in the event
register. If any bits are set in an event register, the following condition register bit is then set. For
example, if the STAT:QUES:ENB (enable) register has bit 0 set and a voltage error is detected,
the event registers bit 0 is set. The 1 in the event register causes bit 3 of the status byte to be
asserted. The Service Request register is ANDed with its enable register for all bits except bit 6.
The result is placed in bit 6 of the Service Request register. If bit 6 is a 1 (true), it causes the
power supply to assert the SRQ line to the host controller.
Figure 3-4 also shows that if the error/event queue is not empty, bit 3 is set in the Service
Request register and bit 4 indicates that a message is available in the output buffer.
FIGURE 3-4. STATUS REPORTING STRUCTURE
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3-28 KLP073008
3.6.7.2 OPERATIONAL STATUS REGISTER
The OPERational condition register contains conditions which are a part of the instrument’s normal operation. The definition of each of these bits (condition register) is as follows:
• 1 through 4 - Not Used — always zero.
• 5 - Waiting for Trigger Summary — 1 indicates the unit is waiting for trigger
• 6 and 7 - Not Used — always zero.
• 8 - Constant Voltage — 1 indicates the instrument is in constant voltage mode.
• 9 - Not Used — always zero.
• 10 - Constant Current — 1 indicates the instrument is in constant current mode.
• 11 through13 - Not Used — always zero.
• 14 - PROGram Running — 1 indicates the program is running.
• 15 - Not Used — always zero.
3.6.7.3 QUESTIONABLE STATUS REGISTER
The QUEStionable condition register (see Figure 3-4) contains status bits representing data/signals which give an indication of the quality of various aspects of the signal.
A bit set in the QUEStionable condition register indicates that the data currently being acquired
or generated is of questionable quality due to some condition affecting the parameter associated with that bit.
• 0 - Overvoltage Error — 1 indicates an overvoltage fault has been detected.
• 1 - Overcurrent Error — 1 indicates an overcurrent fault has been detected.
• 2 - Power Lead Error — 1 indicates that sense lead connections are not complete.
• 3 - Overtemperature Error — 1 indicates a thermal error has been detected.
• 4 - Input Power Error — 1 indicates input mains error.
• 5 - Fan Error — 1 indicates inoperative fan.
• 6 - 15 Not Used — always zero.
3.6.8 SCPI PROGRAM EXAMPLES
Refer to Appendix B, Figures B-1 through B-7 for examples illustrating the use of SCPI commands.
Figure 3-5 is an example of a program using SCPI commands to program the KLP Power Supply. The program illustrated is for a configuration using an IBM PC or compatible with a National
Instruments GPIB interface card. (It will be necessary to consult the manufacturer’s data to
achieve comparable functions with an interface card from a different manufacturer.) This program sets output voltage (Voltage mode) or voltage limit (Current mode) to 5V, and current limit
(Voltage mode) or output current (Current mode) to 1A, then reads the measured (actual) voltage and current, then prints the measurements.
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KLP073008 3-29
3.7 REMOTE PROGRAMMING USING ANALOG SIGNALS
The voltage and current inputs (Vref and Cref, respectively) of the Analog I/O Port (see J2, Figure 2-2 and Table 2-2) are normally inactive. These are activated by connecting pin 12 of J2 to
one of the four GND pins: J2 pin 9, 11, 13 or 15 before turning the power supply on. Once the
power supply is turned on the status display reads aRem. While the power supply is in analog
remote mode, digital queries related to status and readback will be accepted and executed. The
following paragraphs provide detailed information for using analog programming signals.
NOTE: Optimum resolution is achieved with 10V programming input which is equivalent to full
scale. Decreasing the analog voltage equivalent to full scale (see PAR. 4.3.3) will
cause a corresponding decrease in programming resolution.
With the exception of Vref and Cref, all the other Analog I/O Port functions are active regardless
of the status of the analog control signal applied to J2 pin 12. These include internal relay:
RELAY_NO (pin 2), RELAY_COM (pin 4), RELAY_NC (pin 10); voltage and current readbacks:
VOLT_RBACK (pin 6) and CURR_RBACK (pin 7); external trigger: EXT_TRG (pin 14) and
remote inhibit: REM_INH (pin 8).
3.7.1 ENABLING/DISABLING THE OUTPUT USING ANALOG CONTROL
Enabling and disabling the output is accomplished via the analog I/O port using pin 8. Logic 0
(ground) turns the output off, Logic 1 (open) turns the output on.
FIGURE 3-5. TYPICAL EXAMPLE OF KLP POWER SUPPLY PROGRAM USING SCPI COMMANDS
/**************************************************************************/
/* Sample Program For KEPCO power supply, using National Instruments */
/* GPIB interface card and IBM PC or compatible computer */
/**************************************************************************/
#include <stdio.h>
#include "decl.h"
char rd_str[80]; // Input buffer
char dat_str[80]; // Output buffer
int bd,adr;
main() {
adr = ibfind("DEV6"); // Open DEV6 (defined by IBCONF)
bd = ibfind ("GPIB0"); // Open GPIB card
ibsic (bd); // Send Interface Clear
ibsre(bd,1); // Set remote line true
strcpy(dat_str,"VOLT 5;CURR 1"); // Define a set command
strcat(dat_str,"\r\n"); // Append delimiter
ibwrt(adr,dat_str,strlen(dat_str)); // Send string to power supply
strcpy(dat_str,"MEAS:VOLT?;CURR?"); // Define a measure command
strcat(dat_str,"\r\n"); // Append delimiter
ibwrt(adr,dat_str,strlen(dat_str)); // Send string to power supply
strset(rd_str,'\0'); // Clear input buffer
ibrd(adr,rd_str,64); // Read result of measure
printf("received : %s\n",rd_str); // Print voltage and current
}
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3.7.2 PROGRAMMING WITH EXTERNAL RESISTANCE
Figure 3-6 is a simplified diagrams of the KLP showing the switch configuration and external
connections required for analog programming using an external resistance.
1. Overvoltage and Overcurrent settings must be established via either local programming or
digital remote programming prior to initiating Analog Remote programming. (see PAR.
3.7.4.)
2. Turn off power and configure the Analog I/O DIP switch (Figure 2-2) as follows:
SW1: ON (Program output voltage via resistance)
SW2: ON (Program output current via resistance)
SW3: either OFF or ON (disabled when in remote analog programming mode; see
Table 2-2)
SW4: Not used
SW5: Either OFF (Local controls enabled) or ON (Local controls locked)
3. Configure Analog I/O Port J1 (Figure 2-2) by referring to Table 2-6 and Figure 3-6 (grounding
J1 pin 12 enables analog programming).
FIGURE 3-6. ANALOG PROGRAMMING OF OUTPUT VOLTAGE OR
CURRENT USING RESISTANCE
With the power supply configured as shown in Figure 3-6 and assuming the load causes the
power supply to operate in voltage mode, varying external resistor R2 from 0 to 10K causes the
output voltage of the power supply to vary linearly from 0 to full scale, while R1 can be used to
adjust the current limit. When the power supply operates in current mode, R2 will adjust the voltage limit and R1 will adjust output current.
Factory default full scale (F.S.) resistance programming is 10K ohms based on F.S. programming voltage of 10V. To set full scale resistance to a lower value, see PAR. 4.3.3 to change the
F.S. programming voltage to a lower value, then adjust based on 1000 ohms/Volt.
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KLP073008 3-31
3.7.3 PROGRAMMING WITH EXTERNAL VOLTAGE
Figure 3-7 is a simplified diagrams of the KLP showing the switch configuration and external
connections required for analog programming using an external voltage.
1. Virtual Model (PAR. 3.2.5) and Overvoltage and Overcurrent settings (PAR. 3.7.4) must be
established via either local programming or digital remote programming prior to initiating
Analog Remote programming.
2. Turn off power and configure the Analog I/O DIP switch (Figure 2-2) as follows:
SW1: OFF (Program output voltage via voltage)
SW2: OFF (Program output current via voltage)
SW3: either OFF or ON (disabled when in remote analog programming mode; see
Table 2-2)
SW4: Not used
SW5: Either OFF (Local controls enabled) or ON (Local controls locked)
3. Configure Analog I/O Port J1 (Figure 2-2) by referring to Table 2-6 and Figure 3-7 (grounding
J1 pin 12 enables analog programming).
4. Refer to PAR. 3.7.4 to change overvoltage or overcurrent setting in analog programming
mode.
With the power supply configured as shown in Figure 3-7 and assuming the load causes the
power supply to operate in voltage mode, varying source voltage V2 from 0 to maximum causes
the output voltage of the power supply to vary linearly from 0 to full scale, while V1 can be used
to adjust the current limit. When the power supply operates in current mode, V2 will adjust the
voltage limit and V1 will adjust output current.
Factory default full scale (F.S.) voltage programming is 10V. To set full scale voltage programming to a lower value, see PAR. 4.3.3
FIGURE 3-7. ANALOG PROGRAMMING OF OUTPUT VOLTAGE OR CURRENT USING VOLTAGE
3.7.4 CHANGING OVERVOLTAGE OR OVERCURRENT PROTECTION VALUES IN ANALOG
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PROGRAMMING MODE
Overvoltage and overcurrent values can not be changed using analog remote programming;
this can only be done by issuing a command via the GPIB or RS232 port, or via local mode from
the front panel (enter local mode by pressing the VOLTAGE and CURRENT adjustment controls at the same time).
If the panel is locked and RS 232 or GPIB access is not possible, turn the power supply off, set
ANALOG I/O DIP switch position 5 to OFF, and then power up again to unlock the panel
(PAR.3.2.2.1). After the settings have been changed, turn the power supply off, set ANALOG
I/O DIP switch position 5 to ON to relock the panel, then turn on the power supply to restore
Analog Remote Programming (status display reads aRem).
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KLP 073008 4-1
SECTION 4 - CALIBRATION
4.1 GENERAL
This section contains the calibration instructions for the Power Supply. It is recommended that
the user be familiar with Local Mode operation (PAR.3.2) before calibrating the unit.
A full calibration consist of a voltage calibration and a current calibration. Both voltage and current calibrations consist of a zero and a full scale calibration.
External calibration calibrates the precise user-defined reference voltages used that will be
equivalent to full scale output when external analog programming is used.
NOTE: Calibrating the unit resets all internal memory locations used for saving active settings
(*SAV, *RCL), programmed sequences using the LIST commands, and trigger levels
established by CURR:TRIG and VOLT:TRIG. These parameters are returned to the
default minimum (0V, minimum A).
In order to enter the calibration mode the correct calibration access code (password) must be
entered. If the password has been forgotten, call the factory and a special password (which has
been assigned to your power supply) will be provided. During the calibration, new calibration
data is computed which is then stored in the nonvolatile memory either when EXIT is executed
(local mode, PAR. 4.3.4) or SAVE Calibration is executed (remote mode, PAR 4.4.4).
Calibration of the BOP is performed in one of two ways: locally using the front panel controls
(PAR. 4.3), or remotely using the graphical interface supplied with the instrument driver available at www.kepcopower.com/drivers.htm (PAR. 3.5.2). This VISA compliant driver works with
many GPIB cards from suppliers like National Instruments and Hewlett-Packard. These three
ways cannot be combined. Separate calibration procedures are provided for units connected in
series or parallel.
4.2 EQUIPMENT REQUIRED
The following equipment is required to calibrate the KLP Power Supply.
• Digital Voltmeter (DVM) with 6 digits resolution an at least 0.002% accuracy for d-c measurements.
• Precision Shunt Resistor (with a tolerance of 0.01%, power rating of at least 10 times
larger than the maximum stress, and a temperature coefficient equal to or better than 20
ppm per degree C).
NOTES: • Because the voltage measured will be used as reference for calibration, the DVM
used must be accurately calibrated prior to calibrating the power supply.
• Proper cooling of the external precision shunt resistor ensures the accuracy of the
calibration.
4.3 CALIBRATION USING FRONT PANEL CONTROLS IN LOCAL MODE
For voltage calibration all loads must be disconnected and the sense terminals connected to the
corresponding output terminals. The digital voltmeter will be connected to the output of the
power supply. For current calibration after disconnecting all loads an appropriate shunt resistor
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4-2 KLP 073008
will be connected across the output terminals and the digital voltmeter will be connected across
the sense terminals of the shunt resistor.
1. Turn off power supply and disconnect load from output terminals at the rear of the unit.
2. Verify that power supply is configured for local error sensing (PAR. 2.7.5.1).
3. For voltage calibration connect DVM to (M+,S+) and (M-,S-) of terminal block at the rear of
power supply.
4. For current calibration connect an appropriate shunt resistor (see PAR 4.2) across the output
terminals and connect DVM to shunt resistor terminals.
5. Turn on power supply, exit SET mode by tapping either VOLTAGE or CURRENT control and
using a thin tool (e.g., a paper clip), press FUNCTION switch repeatedly until status displays
reads UTIL. Rotate either VO LTAGE or CURRENT control until status display reads CAL.
6. Tap DC OUTPUT switch to enter calibration mode. Status display reads "PASS" and CUR-
RENT DISPLAY reads 0000 while the unit waits for the calibration password to be entered.
The leftmost digit will be flashing.
7. Rotate CURRENT control to select a number from 0-9. Tap CURRENT control to advance to
next digit. Repeat this process until all four digits have been selected. Tap DC OUTPUT
switch to accept the number.
8. If password is incorrect, the status display reads "ERR". Repeat step 7 to enter the correct
password, or press the FUNCTION switch to exit calibration
9. If password is correct, status display reads V ?. Tapping either VOLTAGE or CURRENT
control continuously cycles through all the calibration choices. The status display reads: V ?
for voltage calibration C ? for current calibration, EXT? for remote analog calibration, and
EXIT to save the calibrated results. Tap the FUNCTION switch to exit calibration WITHOUT
saving any calibration data (see PAR. 4.3.4). Tap the DC OUTPUT switch to select the displayed choice.
NOTE: Calibrations may be done in any order.
10.Proceed to PAR. 4.3.1 for voltage calibration, PAR 4.3.2 for current calibration, PAR. 4.3.3
for external calibration or PAR. 4.3.4 to exit calibration
4.3.1 VOLTAGE CALIBRATION (LOCAL)
During voltage calibration, the voltage, voltage readback and remote analog voltage readback
are calibrated.
1. Minimum voltage is first; the status display reads V_0. Monitor DVM and rotate the VOLT-
AGE control to increase or decrease the output voltage until the DVM reads as close as possible to minimum rated voltage.
2. Tap the DC OUTPUT switch to accept the value. The status display then reads VMAX. Monitor DVM and rotate the VOLTAGE control to increase or decrease the output voltage until
the DVM reads as close as possible to maximum rated voltage.
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KLP 073008 4-3
3. Tap the DC OUTPUT switch to accept the value. The status display then reads OUTV. Con-
nect the DVM to ANALOG I/O PORT J2, pin 13 (M–) and pin 6 (M+). Rotate the VOLTAGE
control to increase or decrease the output voltage until the DVM reads as close as possible
to 10V.
4. Tap the DC OUTPUT switch to accept the value. The status display reads C ?. Tap the DC
OUTPUT switch to proceed to Current Calibration (see PAR. 4.3.2), or tap either VOLTAGE
or CURRENT control to advance to next choice
4.3.2 CURRENT CALIBRATION (LOCAL)
During current calibration, the current, current readback and analog current readback are calibrated.
1. The status display reads LOAD. When the shunt and DVM are connected per PAR. 4.3, step
4, tap the DC OUTPUT switch. The status display reads CMAX.
2. Rotate the CURRENT control to increase or decrease the DVM reading until the DVM reading corresponds as close as possible to maximum rated current (Calculate current as follows:
I (Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).
3. Tap the DC OUTPUT switch to accept the value. The status display reads C_0. Rotate the
CURRENT control to increase or decrease the DVM reading until the DVM reading corresponds as close as possible to minimum rated current (Calculate current as follows:
I (Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).
4. Tap the DC OUTPUT switch to accept the value. The status display reads CMAX. Rotate the
CURRENT control to increase or decrease the DVM reading until the DVM reading corresponds as close as possible to maximum rated current (Calculate current as follows:
I (Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).
5. Tap the DC OUTPUT switch to accept the value. The status display reads OUTC. Connect
the DVM to ANALOG I/O PORT J2, pin 13 (M–) and pin 7 (M+). Rotate the CURRENT control to increase or decrease the output voltage until the DVM reads as close as possible to
10V.
6. Tap the DC OUTPUT switch to accept the value. The status display reads EXT?. Tap the DC
OUTPUT switch to proceed to External Calibration (see PAR. 4.3.2), or tap either VOLTAGE
or CURRENT control to advance to next choice
4.3.3 EXTERNAL CALIBRATION (LOCAL)
During external calibration the external analog reference voltages used to establish full scale
output current and voltage are calibrated and defined. The factory default calibration is 10V programs full scale output, however the following procedure allows any d-c value up to 10V to program full scale, while a voltage proportionately less programs a corresponding decrease in the
output.
NOTE: The full scale programming voltage has a 1:1 correspondence with the external read-
back; i.e., 10V full scale programming voltage results in a 10V full scale readback. If
the full scale programming voltage is changed to a value other than 10V, the full scale
readback voltage is changed accordingly.
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4-4 KLP 073008
1. The status display reads INPV. Refer to PAR 3.7 to connect the reference voltage used to
define full scale output voltage. as the source as described in PAR 3.7.
2. When the reference voltage is at the desired value, tap the DC OUTPUT switch to accept the
value. When the calibration is saved, this analog voltage will be equivalent to full scale output voltage. The full scale output voltage is determined by the virtual settings in effect.
3. The status display reads INPC. Connect the reference voltage used to define full scale output current as described in PAR 3.7.
4. When the reference voltage is at the desired value, tap the DC OUTPUT switch to accept the
value. When the calibration is saved, this voltage value will be equivalent to full scale output
current. The full scale output current is determined by the virtual settings in effect.
5. The status display reads EXIT. Proceed to PAR. 4.3.4 to exit calibration.
4.3.4 CALIBRATION EXIT (LOCAL)
NOTE: using a thin tool (e.g., a paper clip), tap the FUNCTION switch to exit calibration WITH-
OUT saving any calibration data. If no calibrations were completed, then the unit
advances to the next function as if the FUNCTION switch was pressed.
1. When the status display reads EXIT, tap the DC OUTPUT switch to save the calibration.
2. The status display reads DATE. The DC VOLTS display represents MMDD (month, day) and
the DC AMPS display represents YYYY (year). The factory calibration date is displayed with
the first digit blinking as a starting point to enter the current date. Rotate either the VOLT-
AGE or CURRENT controls to change the digit, then tap either control to move to the next
digit.
NOTE: For purposes of traceability the user is strongly urged to enter the calibration date upon
completion of calibration. If a date is not entered, no date is saved.
3. Tap DC OUTPUT switch to accept date. If any calibration (voltage, current or external) was
completed, the unit will save the new calibration. The status display reads "DONE" while calibration is being saved.
4. Once saved the unit enters Virtual Model mode. Follow the procedure in PAR 3.2.5 to set the
virtual model.
NOTE: The virtual model is always reset following calibration. If voltage calibration is com-
pleted (regardless of whether or not current calibration is completed), the virtual model
voltage is set for maximum rated voltage, and current is set to the value corresponding
to 1200 Watts. If ONLY current calibration is completed, the virtual model current will
be set for maximum rated current and voltage is set to the value corresponding to 1200
Watts.
4.4 CALIBRATION USING VISA DRIVER DEMO PROGRAM SOFT PANEL
For voltage calibration all loads must be disconnected and the sense terminals connected to the
corresponding output terminals. The digital voltmeter will be connected to the output of the
power supply. For current calibration after disconnecting all loads an appropriate shunt resistor
will be connected across the output terminals and the digital voltmeter will be connected across
the sense terminals of the shunt resistor.
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KLP 073008 4-5
1. Turn off power supply and disconnect load from output bus bar at the rear of the unit.
2. Verify that power supply is configured for local error sensing (See PAR. 2.7.5.1).
3. For voltage calibration connect DVM to (M+, S+) and (M–, S–) of terminal block at the rear of
power supply.
4. For current calibration connect an appropriate shunt resistor (see PAR 4.2) across the output
terminals and connect DVM to shunt resistor terminals.
5. Turn on power supply, and after the status display shows SET, start the KLP VISA demo pro-
gram.
6. Click the Calibrate OPEN button on the VISA demo main panel. The Calibration window
opens.
7. Use the computer keyboard to enter the password in the text box displaying the word PASSWORD, then press the ENTER key.
8. If password is correct, status display on the main panel reads CAL. If password is incorrect,
the text box displays "WRONG #". Repeat step 7 to enter the correct password, or click the
Calibrate CLOSE button on the main panel to exit calibration.
NOTE: Calibrations may be done in any order.
9. Proceed to PAR. 4.4.1 for voltage calibration, PAR 4.4.2 for current calibration., PAR. 4.4.3
for external calibration or PAR. 4.4.4 to exit calibration
4.4.1 VOLTAGE CALIBRATION (VISA DEMO)
During voltage calibration, the voltage, voltage readback and remote analog voltage readback
are calibrated.
1. Click the VOLTAGE button on the Calibration window to start voltage calibration. Minimum
voltage is first; the status display (on the main panel) reads V_0. Monitor DVM and click the
“+” button to increase and the “–“ to decrease the output voltage until the DVM reads as
close as possible to minimum rated POSITIVE voltage.
2. Click the PRESS TO ACCEPT button to accept the value. The status display then reads
VMAX. Monitor DVM and click the “+” button to increase and the “–“ to decrease the output
voltage until the DVM reads as close as possible to maximum rated voltage.
3. Click the PRESS TO ACCEPT button to accept the value. The status display then reads
OUTV. Connect to DVM (+) to Analog I/O Port J2, pin 6 and DVM (–) to pin 13. Click the “+”
button to increase and the “–-“ button to decrease the output voltage until the DVM reads as
close as possible to 10V.
4. Click the PRESS TO ACCEPT button to accept the value. The status display will not change.
At the calibration window, click the CURRENT Button to proceed to current calibration (see
PAR. 4.4.2).
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4-6 KLP 073008
4.4.2 CURRENT CALIBRATION (VISA DEMO)
During current calibration, the current, current readback and analog current readback are calibrated.
1. Click the CURRENT button on the Calibration window to start Current calibration; the status
display (on the main panel) reads LOAD. When the shunt and DVM are connected per PAR.
4.4, step 4, click the CURRENT button to start current calibration. The status display reads
CMAX.
2. Monitor DVM and click the “+” button to increase and the “–“ to decrease the output current
until the DVM reads as close as possible to maximum rated current (Calculate current as follows:
I (Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).
3. Click the PRESS TO ACCEPT button to accept the value. The status display reads C_0.
Click the “+” button to increase and the “–“ to decrease the output current until the DVM
reads as close as possible to minimum rated current (Calculate current as follows:
I (Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).
4. Click the PRESS TO ACCEPT button to accept the value. The status display reads CMAX.
Click the “+” button to increase and the “–“ to decrease the output current until the DVM
reads as close as possible to maximum rated current (Calculate current as follows:
I (Amperes) = DVM reading (Volts) / Shunt Resistance (Ohms).
5. Click the PRESS TO ACCEPT button to accept the value. The status display reads OUTC.
Connect to DVM (+) to Analog I/O Port J2, pin 7 and DVM (–) to pin 13. Click the “+” button
to increase and the “–“ to decrease the output current until the DVM reads as close as possible to 10V.
6. Click the PRESS TO ACCEPT button to accept the value. The status display will not change.
Click the ANALOG REF button on the calibration window to proceed to external calibration
(see PAR. 4.4.3).
4.4.3 ANALOG REFERENCE CALIBRATION (VISA DEMO)
During analog reference calibration the external analog reference voltages used to establish full
scale output current and voltage are defined. The factory default calibration of 10V programs full
scale output, however the following procedure allows any d-c value up to 10V to program full
scale, while a voltage proportionately less programs a corresponding decrease in the output.
NOTE: The full scale programming voltage has a 1:1 correspondence with the external read-
back; i.e., 10V full scale programming voltage results in a 10V full scale readback. If
the full scale programming voltage is changed to a value other than 10V, the full scale
readback voltage is changed accordingly.
1. Click the ANALOG REF button on the Calibration window; the status display (on the main
panel) reads INPV. Refer to PAR 3.7 to connect the reference voltage used as the source to
define full scale output voltage.
2. When the reference voltage is at the desired value, click the PRESS TO ACCEPT button to
accept the value. When the calibration is saved, this analog voltage will be equivalent to full
scale output voltage. NOTE: The full scale output voltage is determined by the virtual
settings in effect.
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KLP 073008 4-7
3. The status display reads INPC. Connect the reference voltage used to define full scale output current as described in PAR 3.7.
4. When the reference voltage is at the desired value, click the PRESS TO ACCEPT button to
accept the value. When the calibration is saved, this voltage value will be equivalent to full
scale output current. NOTE: The full scale output current is determined by the virtual
settings in effect.
5. The status display will not change. Proceed to PAR. 4.4.4 to exit calibration.
4.4.4 CALIBRATION EXIT (VISA DEMO)
NOTE: Clicking the Calibrate CLOSE button on the main panel will exit calibration WITHOUT
saving any calibration data.
1. Click the SAVE CALIBRATION button on the calibration window to save this calibration.
2. The Calibration window automatically closes and the Virtual Model window automatically
opens.
3. The virtual model settings can be changed after the password has been properly entered.
NOTE: The virtual model is always reset following calibration. If voltage calibration is com-
pleted (regardless of whether or not current calibration is completed), the virtual model
voltage is set for maximum rated voltage, and current is set to the value corresponding
to 1200 Watts. If a current calibration is completed, but no Voltage calibration, the virtual model current will be set for maximum rated current and voltage is set to the value
corresponding to 1200 Watts.
4.5 CHANGING THE CALIBRATION PASSWORD
The 4-digit password is required for to enter calibration mode. The factory default password is
listed in Table 4-1. To change the password from the front panel proceed as follows:
1. If the status display shows SET, tap either the CURRENT or VOLTAGE controls to take the
unit out of setpoint mode (status display goes from SET to blank)
2. Hold the PROTECT switch in and use a thin tool (e.g., a paper clip), to press the FUNCTION
switch. Status display reads PASS.
NOTE: To exit this procedure without changing the password, rotate the VOLTAGE control.
3. Tap the DC OUTPUT switch. Status display reads OLD?.
4. Rotate the CURRENT control until DC AMPERES display shows old password. Tap the DC
OUTPUT switch to enter. Status display shows NEW?.
5. Rotate the CURRENT control until DC AMPERES display shows new password. Tap the DC
OUTPUT switch to enter. Status display shows RPT?.
6. Rotate the CURRENT control until DC AMPERES display reads new password. Tap the DC
OUTPUT switch to enter. Status display reads DONE and the unit returns to setpoint mode.
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4-8 KLP 073008
4.6 RESTORING PRIOR CALIBRATION VALUES
Calibration values for KLP are stored in three separate locations designated: Factory, Previous
and Working. Each time the unit is calibrated, the Working values are moved to Previous, and
the new calibration values are stored in Working. It is possible to replace the Working calibration
values with either the Previous or the Factory calibration values; contact Kepco Sales Engineering for details.
TABLE 4-1.FACTORY DEFAULT CALIBRATION PASSWORDS
MODEL PASSWORD
KLP 20-120-1200 2012
KLP 36-60-1200 3660
KLP 75-33-1200 7533
KLP 150-16-1200 1516
KLP 300-8-1200 3008
KLP 600-4-1200 6004
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KLP 073008 A-1
APPENDIX A - IEEE 488.2 COMMAND/QUERY DEFINITIONS
A.1 INTRODUCTION
This appendix defines the IEEE 488.2 commands and queries used with the KLP Power Supply
These commands and queries are preceded by an asterisk (*) and are defined and explained in Figures A-1 through A-14, arranged in alphabetical order. Table A-1 provides a quick reference of all
IEEE 488.2 commands and queries supported in the KLP Power Supply.
A.2 *CLS — CLEAR STATUS COMMAND
*CLS
Syntax: *CLS
Description: Clears status data. Clears the following registers without affecting the corresponding Enable Regis-
ters: Standard Event Status Register (ESR), Operation Status Event Register, Questionable Status
Event Register, and Status Byte Register (STB). Also clears the Error Queue. Related commands:
*OPC, *OPC?. (See example, Figure A-1.)
A.3 *ESE — STANDARD EVENT STATUS ENABLE COMMAND *ESE
Syntax: *ESE <integer> where <integer> = positive whole number: 0 to 255 per Table A-2.
Default Value: 0
Description: This command programs the standard Event Status Enable register bits. The contents function
as a mask to determine which events of the Event Status Register (ESR) are allowed to set the ESB
(Event Summary Bit) of the Status Byte Register. Enables the Standard events to be summarized in
the Status Byte register (1 = set = enable function, 0 = reset = disable function). All of the enabled
events of the standard Event Status Enable register are logically ORed to cause ESB (bit 5) of the Status Byte Register to be set (1 = set = enable, 0 = reset = disable)
. (See example, Figure A-1.)
TABLE A-1. IEEE 488.2 COMMAND/QUERY INDEX
COMMAND PAR. COMMAND PAR.
*CLS A.2 *RST A.10
*ESE, ? A.3, A.4 *SAV A.11
*ESR? A.5 *SRE, ? A.12, A.13
*IDN? A.6 *STB? A.14
*OPC, ? A.7, A.8 *TRG A.15
*RCL A.9 *TST? A.16
TABLE A-2. STANDARD EVENT STATUS ENABLE REGISTER AND
STANDARD EVENT STATUS REGISTER BITS
CONDITION PON NU CME EXE DDE QUE NU OPC
BIT 76543210
VALUE1286432168421
PON Power On
NU (Not Used)
CME Command Error
EXE Execution Error
DDE Device Dependent
Error
QUE Query Error
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A-2 KLP 073008
A.4 *ESE? — STANDARD EVENT STATUS ENABLE QUERY *ESE?
Syntax: *ESE? Return value: Integer> value per Table A-2.
Description: Returns the mask stored in the Standard Event Status Enable Register. Contents of Standard
Event Status Enable register (*ESE) determine which bits of Standard Event Status register (*ESR)
are enabled, allowing them to be summarized in the Status Byte register (*STB). All of the enabled
events of the Standard Event Status Enable Register are logically ORed to cause ESB (bit 5) of the
Status Byte Register to be set (1 = set = enable function, 0 = reset = disable function). (See example,
Figure A-1.)
A.5 *ESR? — EVENT STATUS REGISTER QUERY *ESR?
Syntax: *ESR?
Return value: <integer> (Value = contents of Event Status register as defined in Table A-2.)
Description: Causes the power supply to return the contents of the Standard Event Status register. After it
has been read, the register is cleared. The Standard Event Status register bit configuration is
defined in Table A-2 (1 = set, 0 = reset). The error bits listed in Table A-2 are also related to error
codes produced during parsing of messages and to errors in the power supply (see PAR. B.78)
• Any 1xx type error sets the Command error bit (5) see.
• Any 2xx type error sets the Execution error bit (4).
• Any 3xx type error sets the Device error bit (3). The Device error bit will be set when Current Error
or Voltage Error is detected and the corresponding Status Questionable bit is set (see PAR. B.28).
• Any 4xx type error sets the Query error bit (2).
Related Commands: *CLS, *ESE, *OPC. (See example, Figure A-1.)
A.6 *IDN? — IDENTIFICATION QUERY *IDN?
Syntax: *IDN?
Return value: Character string
Description: Identifies the instrument. This query requests identification. The power supply returns a string
which contains the manufacturer name, the model, the serial number and the firmware level. The
character string contains the following fields: <Manufacturer>, <Model>, <Manufacturing Data>,
<Firmware revision> where: <Manufacturer> = KEPCO, <Model> = KLP V V- CC-1200 (VV is Eo
MAX
,
CC is Io
MAX
,) <Manufacturing Data>=DDMMYYYY-NNNNNN (DD=day, MM=month, and YYYY=year
of manufacture, NNNNNN=unit number) <Firmware revision>=Vn.m (original factory firmware) or
vn.m (updated or secondary firmware) (n.m revision, e.g, V1.01 or v4.00) (See example, Figure A-1.)
A.7 *OPC — OPERATION COMPLETE COMMAND *OPC
Syntax: *OPC
Description: Causes power supply to set status bit 0 (Operation Complete) when pending operations are
complete This command sets Standard Event Status Register bit 0 (see Table A-2) to “1” when all
previous commands have been executed and changes in output level have been completed. This
command does not prevent processing of subsequent commands, but bit 0 will not be set until all
pending operations are completed. (1 = set = enable function, 0 = reset = disable function). (See
example, Figure A-1.) As an example, the controller sends command(s), then sends *OPC. If controller then sends *ESR?, the power supply responds with either a “0” (if the power supply is busy executing the programmed commands), or a “1” (if the previously programmed commands are complete).
(See example, Figure A-1.)
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KLP 073008 A-3
A.8 *OPC? — OPERATION COMPLETE QUERY
*OPC?
Syntax: *OPC?
Return value: <1> (ASCII) placed in output queue when power supply has completed operation.
Description: Indicates when pending operations have been completed.When all pending operations are com-
plete (all previous commands have been executed and changes in output level have been completed)
a “1” is placed in the Output Queue. Subsequent commands are inhibited until the pending operations
are completed. *OPC? is intended to be used at the end of a command line so that the application program can monitor the bus for data until it receives the “1” from the power supply Output Queue. (See
example, Figure A-1.)
FIGURE A-1. GPIB COMMANDS
NOTE: The following example assumes KLP 75-33-1200 with virtual model set for 36V, 33.33A and out-
put operating in voltage stabilization mode.
*CLS Clears data from all status registers.
*ESE 60 Enables bits 5 (command error), 4 (execution error), 3 (device dependent
error) and 2 (query error) (see Table A-1) to set the event status sum-
mary bit when an STB command is executed.
*ESE? Returns 60 (value of mask) verifying that bits 5,4,3 and 2 are enabled.
*ES Invalid command; this will set error bit 5 (command error).
*ESR? Returns 32 (bit 5 set), indicating command error has occurred since the
last time the register was read.
*IDN? Returns: "KEPCO, KLP 75-33-1200, mm-dd-yyyy, Axxxxxx, Vx.xx"
where mm-dd-yyyy indicates date of last calibration, Axxxxxx indicates
unit serial number and Vx.xx indicates firmware revision.
*OPC Directs status bit 0 to be set once pending operations are completed.
OUTP ON Enables output. NOTE: *RST and power-up condition is output off.
VOLT 35;CURR 30 Sets output voltage to 35V, current limit to 30A.
*ESR? Returns 129, indicating 128 (PON, bit 7 = 1) + 1 (OPC, bit 1 = 1).
*ESR? Returns 0 (event status register cleared by prior reading).
VOLT 41.5;CURR 21.5 Sets output voltage to 41.5V, current limit to 21.5A.
*OPC Returns 1 once command operations are completed.
*RST Resets power supply to output off (zero volts, minimum current).
OUTP ON Enables output.
*SRE 40 Enables bits 5 (event status byte summary) and 3 (questionable status
summary) (see Table A-3) to set the request for service bit.
*SRE? Returns 40 (value of mask) indicating bits 5 and 3 are enabled.
*STB? Returns the value of the status byte register, including bit 6 (master sta-
tus summary), without clearing the register; for example, a response of
96 would indicate 64 (MSS, bit 6 =1) + 32 (ESB, bit 5 = 1) have been set.
A return of 00 indicates no bits have been set.
VOLT 25 Sets output voltage to 25V; since output current has not been set, current
limit defaults to the model minimum of 0.4A.
VOLT:TRIG 31.2 Programs output voltage for 31.2V when *TRG is received.
CURR:TRIG 2 Programs output current for 2.0A when *TRG is received.
INIT Trigger event is initialized.
*TRG Output voltage is set to 31.2V with 2A current limit.
*TST? Power supply executes self test of digital controls and responds with 0 if
test is completed successfully, 1 if test fails.
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A-4 KLP 073008
A.9 *RCL — RECALL COMMAND *RCL
Syntax: *RCL <integer> (1 to 40)
Description: Restores power supply to previously defined levels of output voltage, output current, overvolt-
age protection, overcurrent protection, output state (on or off) and relay state. Executing *RCL
recalls the settings previously saved by *SAV from one of 40 memory locations, changing the voltage,
current, overvoltage protection, overcurrent protection, and output on/off state accordingly. If RELAY
mode was set to MANUAL when *SAV was executed, relay state is also restored; relay state is not
saved upon power off. The following parameters are affected by *RCL: VOLT, CURR, VOLT:PROT,
CURR:PROT, and OUTP.
A.10 *RST — RESET COMMAND *RST
Syntax: *RST
Description: Resets power supply to the power on default state. The power supply is programmed to the power
on values of the following parameters: CURR[:LEV][:IMM] = 0, VOLT[:LEV][:IMM] = 0,
CURR:PROT[:LEV] = max overcurrent value (see Table 1-2, VOLT:PROT[:LEV] = (maximum overvoltage value (see Table 1-2), OUTP[:STAT] = ON. (See example, Figure A-1.)
A.11 *SAV — SAVE COMMAND *SAV
Syntax: *SAV <integer> (1 to 40)
Description: Saves the present state of output voltage, output current, overvoltage protection, overcurrent
protection, and output state on/off and (if RELAY mode is set to MANUAL) relay state to the
specified memory location. This command stores the present state of the power supply to one of 40
memory locations in non-volatile Memory. If RELAY mode is set to MANUAL (see PAR 3.2.11.3),
relay state, on or off, is also saved. The following parameters are stored by *SAV: VOLT, CURR,
OUTP, and VOLT:PROT, CURR:PROT. The stored values can be restored by the *RCL command.NOTE: If a Virtual Model setting (see PAR 3.2.5) is changed, previously stored settings may be
outside the range established by the new virtual model. In this case, when *RCL is executed, the value
is cleared to the default minimum (0V, minimum A) and an “out of range” error message is generated.
A.12 *SRE — SERVICE REQUEST ENABLE COMMAND *SRE
Syntax: *SRE<integer> where <integer> = value from 0 - 255 per Table A-3, except bit 6 cannot be pro-
grammed.
Description: Sets the condition of the Service Request Enable register.
The Service Request Enable register determines which events of the Status Byte Register are summed into the MSS (Master
Status Summary) and RQS (Request for Service) bits. RQS is the service request bit that is
cleared by a serial poll, while MSS is not cleared when read. A "1" (1 = set = enable, 0 =
reset = disable) in any Service Request Enable register bit position enables the corresponding Status Byte bit to set the RQS and MSS bits. All the enabled Service Request Enable
register bits then are logically ORed to cause Bit 6 of the Status Byte Register (MSS/RQS)
to be set.
Related Commands: *SRE?, *STB?. (See example, Figure A-1.)
TABLE A-3. SERVICE REQUEST ENABLE AND STATUS BYTE REGISTER BITS
CONDITION OPER
MSS
RQS
ESB MAV QUES
ERR
QUE
NU NU
BIT 7 6543210
VALUE 128 64 32 16 8 4 2 1
OPER Operation Status Summary
MSS Master Status Summary
RQS Request for Service
ESB Event Status Byte summary
MAV Message available
QUES QUEStionable Status Summary
ERR QUE 1 or more errors occurred (see
PAR. B.78)
NU (Not Used)
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KLP 073008 A-5/A-6 Blank
A.13 *SRE? — SERVICE REQUEST ENABLE QUERY
*SRE?
Syntax: *SRE? Response: <integer> = value from 0 - 255 per Table A-3.
Description: Reads the Service Enable Register. Used to determine which events of the Status Byte Register are
programmed to cause the power supply to generate a service request (1 = set = function enabled, 0 =
reset = function disabled). Related Commands: *SRE, *STB? (See example, Figure A-1.)
A.14 *STB? — STATUS BYTE REGISTER QUERY *STB?
Syntax: *STB? Response: <integer> value from 0 to 255 per Table A-3.
Description: Reads Status Byte Register without clearing it. This Query reads the Status Byte Register (bit 6 =
MSS) without clearing it (1 = set = function enabled, 0 = reset = function disabled). The register is
cleared only when subsequent action clears all set bits. MSS is set when the power supply has one
ore more reasons for requesting service. (A serial poll also reads the Status Byte Register, except that
bit 6 = RQS, not MSS; and RQS will be reset.) Related Commands: *SRE, *SRE?. (See example, Figure A-1.)
A.15 *TRG — TRIGGER COMMAND *TRG
Syntax: *TRG
Description: Triggers the power supply to be commanded to preprogrammed values of output current and
voltage. When the trigger is armed (checked by examining WTG bit in Status Operational Condition
register) *TRG generates a trigger signal. The trigger will change the output of the power supply to the
output voltage and current levels specified by VOLT:TRIG and CURR:TRIG commands and clear the
WTG bit in the Status Operation
Condition register. If INIT:CONT has been issued, the trigger
subsystem is immediately rearmed for subsequent triggers, and the WTG bit is again set to
1. *TRG or GET are both addressed commands (only devices selected as listeners will execute the command).
Related Commands: ABOR, INIT, TRIG, CURR:TRIG, VOLT:TRIG. (See
example, Figure A-1.)
A.16 *TST? — SELF TEST QUERY
*TST?
Syntax: *TST? Returned value: 0 or 1 (0 = pass test, 1 = fail test)
Description: Power Supply test.This query causes the power supply to do a self test and provide the controller
with pass/fail results. A cyclic redundancy check (CRC) is performed on non-volatile RAM. A “1” is
returned if there is an error.
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KLP 073008 B-1
APPENDIX B - SCPI COMMAND/QUERY DEFINITIONS
B.1 INTRODUCTION
This appendix defines the SCPI subsystem commands and queries used with the KLP Power
Supply. Subsystem commands are defined in PAR. B.3 through B.92, arranged Alphabetically
in groups as they appear in the tree diagram, Figure 3-3. Table B-1 provides a quick reference
of all SCPI subsystem commands and queries used in the Interface Card.
TABLE B-1. SCPI SUBSYSTEM COMMAND/QUERY INDEX
COMMAND PAR. COMMAND PAR.
ABORt B.3 [SOUR:]VOLT:MODE, ? B.51, B.52
CAL B.4 [SOUR:]VOLT:PROT:LEV, ? B.53, B.54
DISP:TEXT? B.5 [SOUR:]VOLT[:LEV]:TRIG[:AMP]? B.55, B.56
INIT[:IMM] B.6 STAT:OPER:COND? B.57
INIT:CONT, ? B.7, B.8 STAT:OPER:ENAB, ? B.58, B.59
[SOUR:]LIST:CLE B.9 STAT:OPER[:EVENT]? B.60
[SOUR:]LIST:CONT, ? B.10, B.11 STAT:PRES B.61
[SOUR:]LIST:COUN, ? B.12, B.13 STAT:QUES[:EVENT]? B.62
[SOUR:]LIST:COUN:SKIP, ? B.14, B.15 STAT:QUES:COND? B.63
[SOUR:]LIST:CURR, ? B.16, B.17 STAT:QUES:ENAB, ? B.64, B.65
[SOUR:]LIST:CURR:POIN? B.18 SYST:COMM:GPIB:ADDR, ? B.66, B.67
[SOUR:]LIST:DIR, ? B.19, B.20 SYST:COMM:SER:BAUD, ? B.68, B.69
[SOUR:]LIST:DWEL, ? B.21, B.22 SYST:COMM:SER:ECHO, ? B.70, B.71
[SOUR:]LIST:DWEL:POIN? B.23 SYST:COMM:SER:ENAB, ? B.72, B.73
[SOUR:]LIST:QUER, ? B.24, B.25 SYST:COMM:SER:PACE, ? B.74, B.75
[SOUR:]LIST:VOLT, ? B.26, B.27 SYST:COMM:SER:PROM, ? B.76, B.77
[SOUR:]LIST:VOLT:POIN? B.28 SYST:ERR? B.78
MEAS:CURR? B.29 SYST:ERR:CODE? B.79
MEAS:VOLT? B.30 SYST:ERR:CODE:ALL? B.80
OUTP[:STAT], ? B.31, B.32 SYST:KLOCK, ? B.81, B.82
OUTP[:STAT]:PROT:DEL, ? B.33, B.34 SYST:LANG, ? B.83, B.84
[SOUR:]CURR[:LEV][:IMM][:AMP], ? B.35, B.36 SYST:PASS:CEN B.85
[SOUR:]CURR:LIM:HIGH, ? B.37, B.38 SYST:PASS:CDIS B.86
[SOUR:]CURR:MODE, ? B.39, B.40 SYST:PASS:NEW B.87
[SOUR:]CURR:PROT[:LEV], ? B.41, B.42 SYST:PASS:STAT? B.88
[SOUR:]CURR[:LEV]:TRIG[:AMP], ? B.43, B.44 SYST:SEC B.89
[SOUR:]FUNC:MODE, ? B.45, B.46 SYST:SET, ? B.90, B.91
[SOUR:]VOLT[:LEV][:IMM][:AMP], ? B.47, B.48 SYST:VERS? B.92
[SOUR:]VOLT:LIM:HIGH, ? B.49, B.50 TRIG:SOUR B.93
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B-2 KLP 073008
B.2 NUMERICAL VALUES
The SCPI data parser on the KLP supports a maximum of 8 digits after the decimal point and a maximum integer of 4 x 10
8
. Any values greater than these are not processed by the device and no error is generated. The
largest string that can be received or transmitted by the KLP is 253 characters.
All numerical data is returned in scientific notation, digits with decimal point and Exponent, e.g., 2.71E1 for 27.1
after calibration constants have been applied. Thus. for example, VOLT 14;VOLT? may return 1.39997E1
which indicates that the unit has been calibrated to provide 13.9997V for a programmed value of 14V, within
the calculation accuracy of the KLP. Error “-120” results from syntactical errors, e.g., the exponent exceeds 8,
a letter is identified, etc. Error “-222” is produced if the value exceeds the range of acceptable values for the
parameter.
B.3 ABORt COMMAND ABOR
Syntax: Short Form: ABOR Long Form: ABORt
Description: Cancels previously stored trigger levels, resets WTG. The ABORt command cancels any pending
trigger levels previously stored by the CURR:TRIG or VOLT:TRIG commands. The pending level is
set equal to the corresponding immediate value. ABORt also resets the WTG (Wait TriGger) bit in the
Operation Condition status register. If INIT:CONT ON has been programmed, the trigger system rearms itself immediately after ABORt, thereby setting WTG. WTG is bit 5 in the STATUS OPERATION
CONDITION register. The ABORt is executed each time power is turned on. Related Commands:
INIT, *RST, *TRG. (See example, Figure B-1.)
B.4 CAL COMMANDS AND QUERIES CAL
CAL commands and queries are used to perform calibration of the unit via the control interface. These
commands must be issued in a specific sequence in order to properly calibrate the unit. To use these
commands, refer to Kepco’s website (www.kepcopower.com/drivers) and download the LabWindows/
CVI Version 5 driver for KLP. This file provides remote calibration capability and uses the following
supported commands and queries:
CAL:CEXT command
CAL:CGA command
CAL:CURR:LEV command
CAL:CURR[:DATA] command
CAL:DPOT command
CAL:SAVE command
CAL:STAT command and query
CAL:VEXT command
CAL:VGA command
CAL:VOLT:LEV command
CAL:VOLT[:DATA] command
CAL:ZERO command
B.5 DISPlay:TEXT? QUERY DISP:TEXT?
Syntax: Short Form: DISP:TEXT? Long Form: DISPlay:TEXT]?
Return Value: Character string displayed on front panel Status display.
Description: Returns the text displayed on front panel Status display. Returns the character string displayed
on Status display.
B.6 INITiate[:IMMediate] COMMAND INIT[:IMM]
Syntax: Short Form: INIT:[IMM] Long Form: INITiate[:IMMediate]
Description: Enables a single trigger. If INIT:CONT is OFF, then INIT[:IMM] arms the trigger system for a single
trigger. If INIT:CONT is ON, then the trigger system is continuously armed and INIT[:IMM] is redundant. This command enables a single trigger. A GPIB <GET>, *TRG command completes the
sequence. Upon receipt of the <GET>, *TRG command, the power supply will return to the programmed values of voltage and current established by the VOLT:TRIG and CURR:TRIG commands.
After a GPIB <GET>, *TRG command has been received, subsequent GPIB <GET>, *TRG commands have no effect unless preceded by INIT or INIT:CONT ON. Related Commands: <GET>,
*RST, *TRG. (See example, Figure B-1.)
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KLP 073008 B-3
FIGURE B-1. PROGRAMMING THE OUTPUT
B.7 INITiate:CONTinuous COMMAND INIT:CONT
Syntax: Short Form: INIT:CONT {ON | OFF} or {1 | 0} (1 = on, 0 = off)
Long Form: INITiate:CONTinuous {ON | OFF} or {1 | 0} (1 = on, 0 = off)
Description: INIT:CONT ON enables continuous triggers.; INIT:CONT OFF disables continuous triggers. If
INIT:CONT is OFF, then INIT[:IMM] arms the trigger system for a single trigger. If INIT:CONT is ON,
then the trigger system is continuously armed and INIT[:IMM] is redundant. Executing *RST command
sets INIT:CONT to OFF. (See example, Figure B-1.)
B.8 INITiate:CONTinuous? QUERY INIT:CONT?
Syntax: Short Form: INIT:CONT? Long Form: INITiate:CONTinuous?
Return Value: 1 or 0
Description: Determines whether continuous triggers are enabled or disabled. Power supply returns value of
INIT:CONT flag: “1” = continuous triggers are enabled (INIT:CONT ON); “0” = continuous triggers disabled (INIT:CONT OFF). (See example, Figure B-1.)
B.9 [SOURce:]LIST:CLEar COMMAND LIST:CLE
Syntax: Short Form: LIST:CLE Long Form: LIST:CLEar>
Description: Clears all list entries by setting all pointers to 0. Also sets LIST:DIR to UP, LIST:GEN to DSEQ,
Related Commands: All LIST commands (See example, Figure B-2.)
NOTE: The following example assumes KLP 75-33-1200 with virtual model set for 75V, 16A and output operating
in voltage stabilization mode. See Figure B-3 for directions on programming virtual model limits.
OUTP ON Enables output.
OUTP? Returns 1 (output enabled).
VOLT 75;CURR 1.5E-1 Programs output voltage to 75V, current limit to 0.15A.
INIT:CONT: ON Enables continuous triggering.
INIT:CONT? Returns 1 (continuous triggering enabled).
VOLT:TRIG 31.5;:CURR:TRIG3E-1 Programs output voltage for 31.5V, current limit for 0.3A upon receipt of trigger
stimulus.
*TRG Output voltage is set to 31.5V with 0.3A current limit.
VOLT 32.1;CURR 5E-2 Programs output voltage to 32.1V, current limit to 0.05A.
MEAS:VOLT? Returns actual output voltage (if output voltage is 32.15V, power supply
returns 3.215E1).
MEAS:CURR? Returns actual output current.
FUNC:MODE? Returns operating mode of power supply followed by programmed operating
mode, e.g., VOLT,VOLT.
CURR:TRIG? Returns 3E-1 (current value established by CURR:TRIG).
VOLT:TRIG? Returns 3.15E1 (voltage value established by VOLT:TRIG).
ABOR Changes pending trigger levels to immediate values (32.1V, 0.05A).
VOLT 37.7;CURR 2.5E-1 Programs output voltage to 37.7V, current limit to 0.25A.
*TRG Output returns to trigger values established by ABOR (32.1V, 0.05A).
INIT:CONT 0 Disables continuous triggering.
INIT:CONT? Returns 0 (continuous triggering disabled).
OUTP OFF Output disabled.
OUTP? Returns 0 (output disabled).
MEAS:VOLT? Returns 0 (measured output voltage).
VOLT? Returns 3.21E1 (last programmed output voltage).
CURR? Returns 5E-2 (last programmed output current).
CURR? MAX Returns 1.6E1 (maximum allowable current for present virtual model).
CURR? MIN Returns 4E-1 (minimum allowable programming current for model).
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B-4 KLP 073008
B.10 [SOURce:]LIST:CONTrol COMMAND LIST:CONT
Syntax: Short Form: LIST:CONT<boolean> Long Form: LIST:CONTrol><boolean>
where boolean = 0 or OFF, 1 or ON
Description: If relay control set to LIST, allows user to energize (1 or ON) or de-energize (0 or OFF) internal
relay using LIST commands. A LIST:CONT value (0 or 1) must be entered, regardless of relay control setting selected. Related Commands: LIST:CONT?.
B.11 [SOURce:]LIST:CONTrol? QUERY LIST:CONT?
Syntax: Short Form: LIST:CONT?<boolean> Long Form: LIST:CONTrol? <boolean>
return value = 0 (OFF, de-energized) or 1 (ON, energized)
Description: Identifies whether internal relay is energized (1) or de-energized (0). Related Commands:
LIST:CONT. (See PAR 3.2.11.3.)
B.12 [SOURCE:]LIST:COUNt COMMAND LIST:COUN
Syntax: Short Form: LIST:COUN<int_value 0 to 65535> Long Form: LIST:COUNt> <int_value 0 to 65535>
Description: Establishes how many times the list is executed. Allows user to establish how many times the list
(established by LIST:GEN DSEQ or LIST:GEN SEQ and LIST:SEQ) is executed. The order (beginning to end or end to beginning) is determined by LIST:DIR. For LIST:COUN 0, the unit will execute
the sequence indefinitely until either a VOLT:MODE FIXED, or PROG:STOP command is received.
Related Commands: LIST:GEN, LIST:SEQ, LIST:DIR. (See example, Figure B-2.)
B.13 [SOURce:]LIST:COUNt? QUERY LIST:COUN?
Syntax: Short Form: LIST:COUNT? Long Form: LIST:COUNt?
Return Value: <int_value>
Description: Identifies how many times the list will be executed. Returns value set by LIST:COUN command.
(See example, Figure B-2.)
B.14 [SOURce:]LIST:COUNt:SKIP COMMAND LIST:COUN:SKIP
Syntax: Short Form: LIST:COUN:SKIP nn Long Form: LIST:COUNt:SKIP nn
nn = <int_value 0 to 255>
Description: Allows beginning steps of list-generated waveform to be run once, then ignored.
When a list is to be repeated using LIST:COUNT, this command allows the user to skip the first nn
steps once the full set has been executed. After the first iteration (which executes all steps), the first
nn steps are skipped. The LIST:COUN:SKIP command allows the user to precondition a list-generated waveform by setting unique conditions at the beginning that are not repeated for the rest of the
repetitions. LIST:CLEar sets nn to 0. Only works in LIST:DIR UP mode, if LIST:DIR DOWN is issued,
this command has no effect. Related Commands: LIST:COUN, LIST:COUN:SKIP?, LIST:SEQ,
LIST:DIR, LIST:CLE. (See example, Figure B-2.)
B.15 [SOURce:]LIST:COUNt:SKIP? QUERY LIST:COUN:SKIP?
Syntax: Short Form: LIST:COUN:SKIP? Long Form: LIST:COUNt:SKIP?
Return Value: <int_value>
Description: Identifies how many steps will skipped the first time the list is executed. Returns value set by
LIST:COUN:SKIP command. (See example, Figure B-2.)
B.16 [SOURce:]LIST:CURRent COMMAND LIST:CURR
Syntax: Short Form: LIST:CURR <exp_value>, <exp_value>, . . . (to max of 100 data points)
Long Form: LIST:CURRent <exp_value>, <exp_value>, . . . (to max of 100 data points)
<exp_value> = digits with decimal point and Exponent, e.g., 2.71E1 for 27.1
Description: Adds the current value (in Amps) to list. This command sequentially adds LIST:CURRent values to
the main channel List Data Table. Starting location is indicated by LIST:CURR:POIN? The maximum
number of entries is 100. Since the input buffer of the KLP has a limit of 253 characters, multiple commands are necessary to complete the full 100 entries of the list. If LIST:VOLT has any entries, an error
message: -221,"Settings conflict" is posted in the error queue. Related Commands:
LIST:CURR:POIN?. (See example, Figure B-2.)
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KLP 073008 B-5
B.17 [SOURce:]LIST:CURRent? QUERY
LIST:CURR?
Syntax: Short Form: LIST:CURR? Long Form: LIST:CURRent?
Return Value: <value1>, <value2>, . . . to <value16>
Description: Identifies the parameters (main channel) entered for the list. Starting at location established by
LIST:QUERy, returns comma-separated list of up to 16 values indicating the main channel parameters
entered. i.e., the contents of main channel List Data Table. Related Commands: LIST: CURR,
LIST:QUERy. If LIST:VOLT has any entries, an error message: -221,"Settings conflict" is posted in the
error queue. (See example, Figure B-2.)
B.18 [SOURce:]LIST:CURRent:POINts? QUERY LIST:CURR:POIN?
Syntax: Short Form: LIST:CURR:POIN? Long Form: LIST:CURRent:POINts?
Return Value: <value> (0 to 1001)
Description: Identifies the total number of points in a list and the next location to be filled by LIST:CURR
command. The LIST:CURR pointer is initially at 0 via LIST:CLE. For each data point entered by a
LIST:CURR command the list pointer is incremented If LIST:CURR:POIN? returns 5, the LIST:CURR
pointer is at 5 indicating there are 6 data points comprising the list. If LIST:VOLT has any entries, an
error message: -221,"Settings conflict" is posted in the error queue.Related Commands: LIST:CURR.
(See example, Figure B-2.)
B.19 [SOURce:]LIST:DIRection COMMAND LIST:DIR
Syntax: Short Form: LIST:DIR (UP|DOWN) Long Form: LIST:DIRection (UP|DOWN)
Description: Allows the list to be executed from beginning to end (UP) or from end to the beginning
(DOWN). *RST or LIST:CLEar sets the list to the UP direction (beginning to end). Works with both
LIST:GEN DSEQ and LIST:GEN SEQ commands. Related Commands: LIST:GEN. LIST:SEQ,
LIST:DWEL?. (See example, Figure B-2.)
B.20 [SOURce:]LIST:DIRection? QUERY LIST:DIR?
Syntax: Short Form: LIST:DIR? Long Form: LIST:DIRection?
Return Value: <value> (UP or DOWN)
Description: Identifies the for executing the list established by LIST:DIR. Related Commands: LIST: DIR. (See
example, Figure B-2.)
B.21 [SOURce:]LIST:DWELl COMMAND LIST:DWEL
Syntax: Short Form: LIST:DWEL <value> (0.010 to 655.35),<value>,<value>, . . . to maximum of 100 values
Long Form: LIST:DWELl <value> (0.010 to 655.35),<value>,<value>, . . . to maximum of 100 values
Description: Determines how long the main channel parameters will be active. Sets time value (from 0.010 to
655.35) in seconds for List:Dwell locations of the List Data Table. The main channel (either voltage or
current) is determined by the load. If LIST:DWEL is entered for only location 0, that time duration will
apply to all steps when either VOLT:MODE LIST or CURR:MODE LIST is executed. Related Commands: VOLT:MODE, LIST:CURR, LIST:VOLT, LIST:DWEL?, LIST:SEQ. (See example, Figure B-2.)
B.22 [SOURce:]LIST:DWELl? QUERY LIST:DWEL?
Syntax: Short Form: LIST:DWEL? Long Form: LIST:DWELl?
Return Value: <value>
Description: Identifies the dwell times entered for the list. Starting at location established by LIST:QUERy,
returns comma-separated list of up to 16 values indicating the dwell time parameters entered. i.e., the
contents of LIST:DWEL locations of the List Data Table. Related Commands: LIST: DWEL,
LIST:QUERy. (See example, Figure B-2.)
B.23 [SOURce:]LIST:DWELl:POINts? QUERY LIST:DWEL:POIN?
Syntax: Short Form: LIST:DWEL:POIN? Long Form: LIST:DWELl:POINts?
Return Value: <value> (0 to 1001)
Description:Identifies the number of locations for which time values have been entered and the next loca-
tion to be filled by a LIST:DWEL command. If LIST:DWEL:POIN? returns 6, dwell times have been
entered for locations 0 through 5 and location 6 is the next to be filled by a LIST:DWEL command.
LIST:DWEL, LIST:DWEL:POIN. (See example, Figure B-2.)
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B-6 KLP 073008
B.24 [SOURce:]LIST:QUERY COMMAND LIST:QUER
Syntax: Short Form: LIST:QUER <int_value>
Long Form: LIST:QUERy <int_value>
int_value = 0 to 1001
Description: Determines first location to be queried by LIST:SEQ? query. Related Commands: LIST:SEQ?.
LIST:QUER?. (See example, Figure B-2.)
B.25 [SOURce:]LIST:QUERY? QUERY LIST:QUER?
Syntax: Short Form: LIST:SEQ? Long Form: LIST:SEQuence?
Return Value: <int_value>
Description: Identifies first location to be queried by LIST:SEQ?, LIST:VOLT?, LIST:CURR?, LIST:DWEL?
queries. Related Commands: LIST:QUER, LIST:SEQ. (See example, Figure B-2.)
B.26 [SOURce:]LIST:VOLTage COMMAND LIST:VOLT
Short Form: LIST:VOLT[:LEV] <exp_value>, <exp_value>, . . . (to max of 100 data points)
Long Form: LIST:VOLTage[:LEVel] <exp_value>, <exp_value>, . . . (to max of 100 data points)
<exp_value> = digits with decimal point and Exponent, e.g., 2.71E1 for 27.1
Description: Adds the voltage value (in Volts) to list. This command sequentially adds LIST:VOLTage values to
the main channel List Data Table locations. LIST:CLE sets starting location to 0. Next location indicated by LIST:VOLT:POIN? The maximum number of entries is 100. Since the input buffer of the KLP
has a limit of 253 characters, multiple commands are necessary to complete the full 100 entries of the
list. If LIST:CURR has any entries, an error message: -221,"Settings conflict" is posted in the error
queue. Related Commands: LIST:VOLT:POIN?, LIST:CLE, *RST. (See example, Figure B-2.)
B.27 [SOURce:]LIST:VOLTage? QUERY LIST:VOLT?
Syntax: Short Form: LIST:VOLT? Long Form: LIST:VOLTage?
Return Value: <value1>, <value2>, . . . to <value16>
Description: Identifies the parameters (main channel) entered for the list. Starting at location established by
LIST:QUER, returns comma-separated list of up to 16 values indicating the main channel parameters
entered. i.e., the contents of the main channel List Data Table. Related Commands: LIST: VOLT,
LIST:QUER. If LIST:CURR has any entries, an error message: -221,"Settings conflict" is posted in the
error queue. (See example, Figure B-2.)
B.28 [SOURce:]LIST:VOLTage:POINts? QUERY LIST:VOLT:POIN?
Syntax: Short Form: LIST:VOLT:POIN? Long Form: LIST:VOLTage:POINts?
Return Value: <value> (0 to 1001)
Description: Identifies the total number of points in a list and the next location to be filled by LIST:VOLT
command. The LIST:VOLT pointer is initially at 0 via *RST or LIST:CLE. For each data point entered
by a LIST:VOLT command the list pointer is incremented If LIST:VOLT:POIN? returns 5, the
LIST:VOLT pointer is at 5 indicating there are 5 data points comprising the list (locations 0 though 4)
and location 5 is the next to be filled. If LIST:CURR has any entries, an error message: -221,"Settings
conflict" is posted in the error queue. Related Commands: LIST:VOLT. (See example, Figure B-2.)
B.29 MEASure[:SCALar]:CURRent[:DC]? QUERY MEAS:CURR?
Syntax: Short Form: MEAS[:SCAL]:CURR[:DC]? Long Form: MEASure[:SCALar]:CURRent[:DC]?
Return Value: <num_value> (digits with decimal point and Exponent)
Description: Measures actual current. This query returns the actual value of output current (measured at the out-
put terminals) as determined by the programmed value of voltage and current and load conditions.
(See example, Figure B-1.) NOTE: The SCPI convention for this command allows the controller to
establish the range and accuracy of the measurement if nn,nn is added after the question mark; the
KLP accepts this format but sets the command warning bit (13) in the status questionable register and
ignores the extra characters.
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KLP 073008 B-7
FIGURE B-2. USING LIST COMMANDS AND QUERIES
B.30 MEASure:VOLTage[:SCALar][:DC]? QUERY MEAS:VOLT?
Syntax: Short Form: MEAS[:SCAL]:VOLT[:DC]? Long Form: MEASure[:SCALar]:VOLTage[:DC]?
Description: Measures actual voltage. This query returns the actual value of output voltage (measured at the out-
put terminals) as determined by the programmed value of voltage and current and load conditions.
(See example, Figure B-1.) NOTE: The SCPI convention for this command allows the controller to
establish the range and accuracy of the measurement if nn,nn is added after the question mark; the
KLP accepts this format but sets the command warning bit (13) in the status questionable register and
ignores the extra characters.
NOTE: The following example assumes KLP 75-33-1200 with virtual model set for 36V, 33.33A and out-
put operating in voltage stabilization mode. See Figure B-3 for directions on programming virtual
model limits.
LIST:CLE Clears main channel (LIST:CURR or LIST:VOLT) and LIST:DWEL
data tables and initializes the LIST processor to add entries.
LIST:DWEL 2 Sets the time duration for Location 0 to be 2 seconds. NOTE: If spe-
cific dwell times are not entered for the rest of the locations in the list
before running the list, this dwell time will be assigned to all entries.
LIST:VOLT 28,32,18 Starting at Location 0, fills the first three locations with the voltages
shown.
LIST:VOLT:POIN? Returns 3, indicating that 3 data points have been entered; also indi-
cates that the next data location to be filled is Location 3.
LIST:QUER? Returns 0 indicating list starting point (default location set by
LIST:CLE).
LIST:VOLT? Returns 2.8E1,3.2E1,1.8E1 (the contents of the filled locations).
LIST:VOLT 20,22,24,26,28 Adds five points to the list (Locations 3 through 7). The list now has
eight points.
LIST:VOLT:POIN? Returns 8.
LIST:QUER 3 Starts LIST queries from Location 3.
LIST:COUN 10 Specifies that upon receipt of VOLT:MODE LIST, the above
sequence will be executed 10 times.
LIST:COUN:SKIP 2 Specifies that the first two steps of the sequence will only be exe-
cuted during the first cycle through the list; thereafter, the list shall
execute Locations 2 through 7 an additional 9 times.
LIST:CURR 3 Programs output current to 3A for all locations. NOTE All active loca-
tions must have complete sets of data entered, or list will not run.
LIST: CONT 0 Programs relay control to de-energized state. NOTE: This command
is necessary only if the relay control is set to LIST (see PAR.
3.2.11.3).
OUTP ON Enables output.
VOLT 24;CURR 3 Initializes output voltage to 24V, output current to 3A.
VOLT:MODE LIST Executes the list. For the first cycle the voltage will step to 28V and
32V in 2-second dwell increments, then begin a cycle of steps from
18V to 28V in 2V steps and 2-second dwell increments repeated ten
times, at the end of which time the output will remain constant at
28V and 3A.
VOLT:MODE FIX Halts execution of the list and maintains the outputs at their immedi-
ate settings.
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B-8 KLP 073008
B.31 OUTPut[:STATe] COMMAND OUTP
Syntax: Short Form: OUTP[:STAT] <boolean> Long Form: OUTPut[:STATe] <boolean>
<boolean>=(0 or OFF, 1 or ON)
Description: Enables or disables the power supply output (see PAR.3.7.1 for disabling if analog program-
ming used). Upon power up the output is enabled (OUTP ON). When OUTP OFF is executed, the
digitally programmed values of voltage and current are saved, then voltage and current are programmed to 0; analog programming is not affected. When OUTP ON is executed, the power supply
output is restored to the previously saved programmed values. The saved values of voltage and current can be viewed by VOLT? and CURR? queries. Related Commands: OUTP?. (See example, Figure B-1.)
B.32 OUTPut[:STATe] QUERY OUTP?
Syntax: Short Form: OUTP[:STAT]? Long Form: OUTPut[:STATe]?
Return Value: <int_value> (0 or 1)
Description: Indicates whether power supply output is enabled or disabled. Returns 0 if output disabled,
returns 1 if output enabled. Related Commands: OUTP. (See example, Figure B-1.)
B.33 OUTPut[:STATe]:PROTect:DELay COMMAND OUTP:PROT:DEL
Syntax: Short Form: OUTP[:STAT]:PROT:DEL NNNN Long Form: OUTPut[:STATe]:PROTect:DELay NNNN
where NNNN = 000.5 to 128.0 seconds in 0.5 second intervals.
Description: Determines the delay before the relay is energized when relay control is set to FLT mode and
either option
C->V or V->C is selected. (See PAR. 3.2.11.3 for details)
B.34 OUTPut[:STATe]:PROTect:DELay? QUERY OUTP:PROT:DEL?
Syntax: Short Form: OUTP[:STAT]:PROT:DEL? Long Form: OUTPut[:STATe]:PROTect:DELay?
returns NNNN where NNNN = 000.5 to 128.0 seconds in 0.5 second intervals.
Description: Returns the programmed delay before the energizing. Active only if relay control is set to FLT
mode and either option
C->V or V->C is selected. (See PAR. 3.2.11.3 for details)
B.35 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude] COMMAND CURR
Syntax: Short Form: [SOUR:]CURR[:LEV][:IMM][:AMP] <exp_value>
Long Form: [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude] <exp_value>
<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Sets programmed current level at power supply output. This command programs output current to
a specific value; actual output current will depend on load conditions. If the value exceeds the maximum for the model being programmed, error message -222,”Data out of range” is posted in output
queue. If value programmed exceeds the CURR:LIM:HIGH value, a value corresponding to the current limit will be programmed. If value programmed is lower than the model minimum, a value corresponding to the model minimum (see Table 1-1) will be programmed. Related Commands:
CURR:LIM:HIGH. (See example, Figure B-1.)
B.36 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude]? QUERY CURR?
Syntax: Short Form: [SOUR:]CURR[:LEV][:IMM][:AMP]? MIN, MAX
Long Form: [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude]? MIN, MAX
Return Value:<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Returns either the programmed value, maximum value, or minimum value of current. The
CURR? query returns the programmed value of current. Actual output current will depend on load conditions. The CURR? MAX query returns the maximum current allowed for a particular model. CURR?
Returns programmed current value. CURR? MAX returns maximum current allowed for power supply.
CURR? MIN returns minimum current allowed for the power supply model (see Table 1-1). Related
Commands: CURR. (See example, Figure B-1.)
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KLP 073008 B-9
B.37 [SOURce:]CURRent:LIMit:HIGH COMMAND
CURR:LIM:HIGH
Syntax: Short Form: [SOUR:]CURR:LIM:HIGH <exp_value>
Long Form: [SOURce:]CURRent:LIMit:HIGH <exp_value>
<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Sets Virtual Model maximum programmable limit for power supply output current (see PAR.
3.2.5). If the value is out of the acceptable current range for the power supply model, error message
-222,"Data out of range" is posted in the output queue. If the user tries to set an output current value
larger than the CURR:LIM:HIGH setting, a value corresponding to the current limit will be programmed
and error message -301,"Value bigger than limit" is posted in the output queue. Once the limit is
established, the unit will not allow values higher than the programmed limit. NOTE: If the Virtual Model
maximum programmable current limit is changed, previously stored trigger levels, (PAR. B.43), stored
settings (PAR. A.11) or programmed sequences using the LIST commands may be outside the range
established by the new virtual model. In this case, prior to execution, the value is cleared to the default
minimum (minimum A) and an “out of range” error message is generated. This command is password
protected, requires SYST:PASS:CEN prior to execution. Related Commands: CURR,
SYST:PASS:CEN. (See example, Figure B-3.)
B.38 [SOURce:]CURRent:LIMit:HIGH? QUERY CURR:LIM:HIGH?
Syntax: Short Form: [SOUR:]CURR:LIM:HIGH? Long Form: [SOURce:]CURRent:LIMit:HIGH?
Return Value:<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Returns value representing Virtual Model current limit set by CURR:LIM:HIGH command.
Related Commands: CURR:LIM:HIGH, CURR. (See example, Figure B-3.)
B.39 [SOURce:]CURRent:MODE COMMAND CURR:MODE
Syntax: Short Form: [SOUR:]CURR:MODE (FIX | LIST | TRAN) nn
Long Form: [SOURce:]CURRent:MODE (FIXed | LIST | TRANsient) nn
nn = <value> = time in seconds for transient
Description: Allows the user to execute or stop a list, or to execute a transient. The default mode is FIX: the
power supply executes commands normally, and LIST commands can be issued to establish the
parameters and sequence of a list.
When CURR:MODE LIST is issued, a list is executed (See LIST commands and Figure B-2). While
the list is being executed, LIST commands are not accepted and will produce a command error.
Issuing CURR:MODE FIX while the list is running will stop the execution of the list and return power
supply to settings in effect prior to running the list. If the list runs to completion, the settings of the last
step of the list will be in effect.
CURR:MODE TRAN nn (Not supported at this time, contact Kepco for more information).
Related Commands: LIST commands. (See example, Figure B-2.)
B.40 [SOURce:]CURRent:MODE? QUERY CURR:MODE?
Syntax: Short Form: [SOUR:]CURR[:LEV]:MODE?
Long Form: [SOURce:]CURRent[:LEVel]:MODE?
Return value: FIXED or LIST or TRAN
Description: Identifies active voltage mode. Returns LIST while list is being executed. TRAN (transient) is not
supported at this time, contact Kepco for more information. Returns FIXED while in fixed (default)
mode of operation. Related Commands: LIST commands. (See example, Figure B-2.)
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B-10 KLP 073008
FIGURE B-3. PROGRAMMING VIRTUAL MODELS
B.41 [SOURce:]CURRent:PROTection[:LEVel] COMMAND CURR:PROT
Syntax: Short Form: [SOUR:]CURR:PROT[:LEV] <exp_value>
Long Form: [SOURce:]CURRent:PROTection[:LEVel] <exp_value>
<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Sets overcurrent protection level for power supply. If the value is out of the acceptable overcur-
rent range for the power supply model, error message -222,"Data out of range" is posted in the output
queue. If the power supply output exceeds the current protection level programmed, then the power
supply output is disabled (programmed to 0V, minimum current (see Table 1-1) and the OC bit in the
Questionable Condition status register is set. (See example, Figure B-4.)
B.42 [SOURce:]CURRent:PROTection[:LEVel]? QUERY CURR:PROT?
Syntax: Short Form: [SOUR:]CURR:PROT[:LEV]? {MIN | MAX}
Long Form: [SOURce:]CURRent:PROTection[:LEVel]? {MIN | MAX}
Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Returns value representing current protection level.CURR:PROT? returns value set by
CURR:PROT. CURR:PROT?MAX returns maximum current protection value (see Table 1-2). This
value is determined at the factory and cannot be changed by the user. CURR:PROT?MIN returns the
minimum current protection value (see Table 1-1). (See example, Figure B-4.)
Description: Returns the current value established by CURR:TRIG command. (See example, Figure B-1.)
NOTE: The following example assumes KLP 75-33-1200 with virtual model set for 75V, 16A.
SYST:PASS:CEN 7533 Enables access to the protected commands. NOTE: Password
shown is factory default value for KLP 75-33-1200; values will
vary for other models (see Table 4-1) and can be altered by user.
VOLT:LIM:HIGH? Returns 7.5E1 (75V, virtual model voltage rating).
VOLT:LIM:HIGH 70 Programs virtual model voltage to 70V.
VOLT:LIM:HIGH? Returns 7.0E1 (70V, new virtual model voltage rating).
CURR:LIM:HIGH? Returns 1.6E1 (16A, virtual model current rating).
CURR:LIM:HIGH 30 Programs virtual model current to 30A.
CURR:LIM:HIGH? Returns 3E1 (30A, virtual model current rating).
VOLT:LIM:HIGH? Returns 4 E1 (40V, new virtual model voltage rating). Since model
is limited to 1200W maximum output, programming the maximum
virtual model current to 30A automatically forces the maximum
voltage to be no more than 1200 / 30 = 40V.
VOLT:LIM:HIGH 33 Programs virtual model voltage to 30A. Virtual model limits are now
set to 33V and 30A.
SYST:PASS:CDIS 7533 Disables access to the protected commands (password value must
match).
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KLP 073008 B-11
FIGURE B-4. PROGRAMMING AS A CURRENT STABILIZER
B.43 [SOURce:]CURRent:[:LEVEL]TRIGgered[:AMPlitude] COMMAND CURR:TRIG
Syntax: Short Form: [SOUR:]CURR[:LEV]:TRIG[:AMP] <exp_value>
Long Form: [SOURce:]CURRent[:LEVel]:TRIGgered[:AMPlitude] <exp_value>
<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Programs current value to be transferred to output by *TRG commands. Actual output current
will depend on load conditions. If the value exceeds the maximum for the model being programmed,
error message -222,”Data out of range” is posted in output queue. If value exceeds CURR:LIM:HIGH
value, a value corresponding to the current limit will be programmed. NOTE: A voltage trigger level
must be entered at least once. Related Commands: CURR. (See example, Figure B-1.)
B.44 [SOURce:]CURRent:[:LEVEL]TRIGgered[:AMPlitude]? QUERY CURR:TRIG?
Syntax: Short Form: [SOUR:]CURR[:LEV]:TRIG[:AMP]?
Long Form: [SOURce:]CURRent[:LEVel]:TRIGgered[:AMPlitude]?
Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
B.45 [SOURce:]FUNCtion:MODE COMMAND FUNC:MODE
Syntax: Short Form:FUNC:MODE {VOLT | CURR}
Long Form: FUNCtion:MODE {VOLT | CURR}
Description: Establishes the operating mode of the power supply. VOLT = Constant Voltage mode (CV).
CURR = Constant Current mode (CC). Default operating mode is CV.
NOTE: The following example assumes KLP 75-33-1200 with virtual model set for 36V, 33.33A and output
operating in current stabilization mode. See Figure B-3 for directions on programming virtual
model limits.
VOLT 32.1;CURR 4 Programs output voltage for 32.1V, output current for 4A.
OUTP ON Enables output. NOTE: Load determines output operating mode; if
load resistance is less than 32.1/4, output will operate as current stabilizer.
MEAS:CURR? Returns measured output current, approximately 4E0 assuming cur-
rent stabilizer operation.
CURR? Returns 4E0 (4A, programmed output current).
CURR 3.3E-1 Programs output current to 0.33A. NOTE: For this model, 0.4A is the
minimum load current (see Table 1-1), therefore although 0.33 value
is programmed; load current will not be less than 0.4A. No explicit
indication is given regarding this change.
CURR? Returns 4E-1 (0.4A).
CURR? MAX Returns 3.333E1 (33.33A, the virtual model current setting).
CURR:PROT .5 For this model, minimum overcurrent protection is 0.6 x 33.33 =
20A,(see PAR. 3.2.7), therefore power supply returns error message
-222 (Data out of range, ESR bit 4 =1) and the limit remains
unchanged.
CURR:PROT 25 Programs overcurrent protection limit to 25A.
CURR:PROT? Returns 2.5E1 (25A).
CURR 26 Returns error message -301 (Value bigger than limit, ESR bit 3=1) and
current setting remains unchanged at 0.4A.
CURR:PROT?MAX Returns 4E1 (maximum allowable overcurrent protection limit for
model is 40A, 20% above maximum current (33.33A) for KLP 75-33-
1200, regardless of virtual model setting).
Page 98
B-12 KLP 073008
B.46 [SOURce:]FUNCtion:MODE? QUERY FUNC:MODE?
Syntax: Short Form: FUNC:MODE? Long Form: [SOURce:]FUNCtion:MODE?
Return Value: String1,String2 where string 1is the actual operating mode: VOLT = Constant Voltage
mode (CV).CURR = Constant Current mode (CC) and string 2 is the mode that was commanded
using FUNC:MODE.
Description: Identifies the operating mode and commanded operating of the power supply.
B.47 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude] COMMAND 0 VOLT
Syntax: Short Form: [SOUR:]VOLT[:LEV][:IMM][:AMP] <exp_value>
Long Form: [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude] <exp_value>
<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Sets programmed voltage level at power supply output. This command programs output voltage
to a specific value; actual output voltage will depend on load conditions. If the value exceeds the maximum for the model being programmed, error message -222,”Data out of range” is posted in output
queue. If value programmed exceeds the VOLT:LIM:HIGH value, a value corresponding to the voltage
limit will be programmed. Related Commands: VOLT:LIM:HIGH. (See example, Figure B-1.
B.48 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude]? QUERY VOLT?
Syntax: Short Form: [SOUR:]VOLT[:LEV][:IMM][:AMP]? {MIN | MAX}
Long Form: [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude]? {MIN | MAX}
Description: Identifies programmed voltage, maximum allowable voltage, or minimum voltage (always 0).
The VOLT? query returns the programmed value of voltage. Actual output voltage will depend on load
conditions. The VOLT? MAX query returns the maximum voltage allowed for a particular model (e.g.,
25V for ABC25-4DM). VOLT? MINReturns minimum voltage allowed for power supply (always 0).
Related Commands: VOLT. (See example, Figure B-5.)
B.49 [SOURce:]VOLTage:LIMit:HIGH COMMAND VOLT:LIM:HIGH
Syntax: Short Form: [SOUR:]VOLT:LIM:HIGH <exp_value>
Long Form: [SOURce:]VOLTage:LIMit:HIGH <exp_value>
<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Sets Virtual Model limit for maximum power supply output voltage (see PAR. 3.2.5). If the value
is out of the acceptable current range for the power supply model, error message -222,"Data out of
range" is posted in the output queue. If the user tries to set an output voltage value larger than the
VOLT:LIM:HIGH setting, a value corresponding to the voltage limit will be programmed and error message -301,"Value bigger than limit" is posted in the output queue. NOTE: If the Virtual Model voltage
limit is changed, all associated parameters are cleared and must be reprogrammed (see PAR. 3.2.5).
Once the limit is established, the unit will not allow values higher than the programmed limit. NOTE: If
the Virtual Model maximum programmable voltage limit is changed, previously stored trigger levels,
(PAR. B.55), stored settings (PAR. A.11) or programmed sequences using the LIST commands may
be outside the range established by the new virtual model. In this case, prior to execution, the value is
cleared to the default minimum (0V) and an “out of range” error message is generated. This command
is password protected, requires SYST:PASS:CEN prior to execution. Related Commands: VOLT,
SYST:PASS:CEN. (See example, Figure B-3.)
B.50 [SOURce:]VOLTage:LIMit:HIGH? QUERY VOLT:LIM:HIGH?
Syntax: Short Form: [SOUR:]VOLT:LIM:HIGH? Long Form: [SOURce:]VOLTage:LIMit:HIGH?
Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Returns value representing Virtual Model voltage limit set by VOLT:LIM:HIGH command.
Related Commands: VOLT:LIM:HIGH, VOLT. (See example, Figure B-5.)
Page 99
KLP 073008 B-13
B.51 [SOURce:]VOLTage:MODe COMMAND
VOLT:MODE
Syntax: Short Form: [SOUR:]VOLT:MODE (FIX | LIST | TRAN) nn
Long Form: [SOURce:]VOLTage:MODE (FIXed | LIST | TRANsient) nn
nn = <value> = time in seconds for transient
Description: Allows the user to execute or stop a list, or to execute a transient. The default mode is FIX: the
power supply executes commands normally, and LIST commands can be issued to establish the
parameters and sequence of a list.
When VOLT:MODE LIST is issued, a list is executed (See LIST commands and Figure B-2). While
the list is being executed, LIST commands are not accepted and will produce a command error.
Issuing VOLT:MODE FIX while the list is running will stop the execution of the list and return power
supply to settings in effect prior to running the list. If the list runs to completion, the settings of the last
step of the list will be in effect.
VOLT:MODE TRAN nn (Not supported at this time, contact Kepco for more information).
Related Commands: LIST commands. (See example, Figure B-2.)
B.52 [SOURce:]VOLTage:MODe? QUERY VOLT:MODE?
Syntax: Short Form: [SOUR:]VOLT[:LEV]:MODE?
Long Form: [SOURce:]VOLTage[:LEVel]:MODE?
Return value: FIXED or LIST or TRAN
Description: Identifies active voltage mode. Returns LIST while list is being executed. TRAN (transient) is not
supported at this time, contact Kepco for more information. Returns FIXED while in fixed (default)
mode of operation. Related Commands: LIST commands. (See example, Figure B-2.)
B.53 [SOURce:]VOLTage:PROTection[:LEVel] COMMAND VOLT:PROT
Syntax: Short Form: [SOUR:]VOLT:PROT[:LEV] <exp_value>
Long Form: [SOURce:]VOLTage:PROTection[:LEVel] <exp_value>
<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Sets overvoltage protection level for power supply.If the value is out of the acceptable overvoltage
range for the power supply model, error message -222,"Data out of range" is posted in the output
queue. If the power supply output exceeds the voltage protection level programmed, then the power
supply output is disabled (programmed to 0) and the OV bit in the Questionable Condition status register is set. An overvoltage condition can be cleared with the VOLT:PROT:CLE command. The voltage
protection level can be programmed independently of the output voltage level. Setting voltage protection to a value lower than the output voltage causes the voltage protection mechanism to trigger immediately. (See example, Figure B-5.)
B.54 [SOURce:]VOLTage:PROTection[:LEVel]? QUERY VOLT:PROT?
Syntax: Short Form: [SOUR:]VOLT:PROT[:LEV] MIN, MAX
Long Form: [SOURce:]VOLTage:PROTection[:LEVel] MIN, MAX
Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Identifies overvoltage protection setting, maximum allowable overvoltage protection, or mini-
mum overvoltage protection. VOLT:PROT? returns value set by VOLT:PROT. VOLT:PROT? MAX
returns maximum voltage protection value (see Table 1-2 ); this value is determined at the factory and
cannot be changed by the user. VOLT:PROT? MIN returns the minimum voltage protection value
(always 0). (See example, Figure B-5.)
B.55 [SOURce:]VOLTage:[:LEVel]TRIGgered[:AMPlitude] COMMAND VOLT:TRIG
Syntax: Short Form: [SOUR:]VOLT[:LEV]:TRIG[:AMP] <exp_value>
Long Form: [SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPlitude] <exp_value>
<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Programs voltage value to be transferred to output by *TRG commands. Actual output voltage
will depend on load conditions. If the value exceeds the maximum for the model being programmed,
error message -222,”Data out of range” is posted in output queue. If value exceeds VOLT:LIM:HIGH
value, a value corresponding to the voltage limit will be programmed. NOTE: A current trigger must be
entered at least once. (See example, Figure B-1.)
Page 100
B-14 KLP 073008
FIGURE B-5. PROGRAMMING AS VOLTAGE STABILIZER
B.56 [SOURce:]VOLTage:[:LEVel]TRIGgered[:AMPlitude]? QUERY VOLT:TRIG?
Syntax: Short Form: [SOUR:]VOLT[:LEV]:TRIG[:AMP]?
Long Form: [SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPlitude]?
Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1
Description: Returns value representing voltage value to be programmed by *TRG command established by
VOLT:TRIG command). (See example, Figure B-1.)
B.57 STATus:OPERation:CONDition QUERY STAT:OPER:COND?
Syntax: Short Form: STAT:OPER:COND? Long Form: STATus:OPERation:CONDition?
Return Value: <int_value> 0 to 1313 (1 + 32 + 256 + 1024).
Description: Returns the value of the Operation Condition Register (see Table B-2). The Operation Condition
Register contains unlatched real-time information about the operating conditions of the power supply.
Bit set to 1 = function enabled (active, true); bit reset to 0 = function disabled (inactive, false). (See
example, Figure B-6.)
NOTE: The following example assumes KLP 75-33-1200 with virtual model set for 36V, 33.33A and
output operating in voltage stabilization mode. See Figure B-3 for directions on programming
virtual model limits.
VOLT 21.8;CURR .5 Programs output voltage for 21.8V, output current for 0.5A.
OUTP ON Enables output. NOTE: Load determines output operating mode; if
load resistance is greater than 21.8/0.5, output will operate as
voltage stabilizer.
MEAS:VOLT? Returns measured output voltage, approximately 2.18E1 (21.8V)
assuming voltage stabilizer operation.
VOLT? Returns 2.18E1 ( (21.8V, programmed output voltage).
VOLT 2.15 Programs output voltage to 2.15V.
VOLT? Returns 2.15E0 (2.15V, programmed output voltage).
VOLT? MAX Returns 3.6E1 (36V, the virtual model voltage setting).
VOLT? MIN Returns 0 (minimum allowable program voltage).
VOLT:PROT 6.5 For this model, minimum overvoltage protection is 0.2 x 75 = 15V,
therefore power supply returns error message -222 (Data out of
range, ESR bit 4 =1) and the limit remains unchanged.
VOLT:PROT 25 Sets overvoltage protection limit to 25V.
VOLT:PROT? Returns 2.5E1 (25V).
VOLT 26 Returns error message -301 (Value bigger than limit, ESR bit 3=1)
and current setting remains unchanged at 2.15V.
VOLT:PROT?MAX Returns 9E1 (maximum allowable overvoltage protection limit for
model is 90V, 20% above maximum voltage (75V) for KLP 75-33-
1200, regardless of virtual model setting).
TABLE B-2. OPERATION CONDITION REGISTER, OPERATION ENABLE REGISTER,
AND OPERATION EVENT REGISTER BITS
CONDITION NU PR NU CC NU CV NU WTG NU CAL
BIT 15 14 11-13 10 9 8 7 - 6 5 4 - 1 0
VALUE 32,768 16,384
2048 -
8192
1024 512 256
128
- 64
32
16 -
2
1
CAL - INTERFACE COMPUTING NEW CALIBRATION
CONSTANTS
CC - POWER SUPPLY IN CONSTANT CURRENT
MODE
CV - POWER SUPPLY IN CONSTANT VOLTAGE
MODE
NU - NOT USED
PR - PROGRAM RUNNING
WTG - WAIT FOR TRIGGER (SET BY TRIG
SUBSYSTEM)
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