OPERATOR’S MANUAL
MBT SERIES
POWER SUPPLY
360 WATT PROGRAMMMABLE POWER SUPPLIES
MODEL
MBT SERIES
POWER SUPPLY
ORDER NO. REV. NO.
IMPORTANT NOTES:
1) This manual is valid for the following Model and associated serial numbers:
MODEL SERIAL NO. REV. NO.
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®
©2009, KEPCO, INC
KEPCO, INC. z 131-38 SANFORD AVENUE z FLUSHING, NY. 11355 U.S.A. z TEL (718) 461-7000 z FAX (718) 767-1102
email: hq@kepcopower.com z World Wide Web: http://www.kepcopower.com
THE POWER SUPPLIER™
Declaration of Conformity
Application of Council directives:
Standard to which Conformity is declared:
EN61010-1:1993 (Safety requirements for electrical equipment for measurement,
control and laboratory use)
Manufacturer's Name and Address:
Importer's Name and Address:
Type of Equipment:
Model No.:
73/23/EEC (LVD)
93/68/EEC (CE mark)
KEPCO INC.
131-38 SANFORD AVENUE
FLUSHING, N.Y. 11355 USA
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Component Power Supply
[PRODUCT MODEL NUMBER]
Y
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.11355 USA
Saul Kupferberg
(Full Name)
Date:
228-1348 DC-COMP/INST 111609 A
VP OF SALES
(position)
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 Cl. 6, Cl. 7, Cl.8, Cl. 9 and EN610101 annex F)
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, and as such depends upon proper connection to protective earth for safety from electric shock. (EN61010-1 Cl. 6.5.4)
4. This power supply 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 Cl.
6.5.4 and Cl.6.10.1)
5. This power supply has secondary output circuits that are considered hazardous, and which exceed
240 VA at a potential of 2V or more.
6. The output wiring terminals of this power supply have not been evaluated for field wiring and, therefore, must be properly configured by the end product manufacturer prior to use.
7. 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. (EN61010-1 Cl.
9.6.2)
8. 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.
B 228-1351 COND/CONFORM 111609
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:
!
!
!
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.
This product is factory-wired for the nominal a-c mains voltage indicated on the rating nameplate located adjacent to the source power connection on the product's rear
panel. To reconfigure the product input for other nominal mains voltages as listed
herein, the product must be modified by a trained service technician.
2. Grounding
This product is a Class 1 device which utilizes protective earthing to ensure operator safety.
The PROTECTIVE EARTHING CONDUCTOR TERMINAL must be properly con-
!
nected 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.
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.
This symbol appears adjacent to any external terminals at which hazardous voltage
!
228-1352 SAFETY - (COVER REMOVAL) 111609 C/(D BLANK)
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.
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 .................................................................................................................................................. 1-5
1.4.1 Local Control...................................................................................................................................... 1-5
1.4.2 Remote Control.................................................................................................................................. 1-5
1.5 Options .................................................................................................................................................... 1-5
1.5.1 Option G - Single Board Computer.................................................................................................... 1-5
1.5.2 Option R - Output/Polarity Reversal Relays ...................................................................................... 1-5
1.6 Equipment Supplied ................................................................................................................................ 1-7
1.7 Accessories ............................................................................................................................................. 1-7
SECTION 2 - INSTALLATION
2.1 Unpacking and Inspection ....................................................................................................................... 2-1
2.2 Terminations and Controls ...................................................................................................................... 2-1
2.3 Source Power Requirements .................................................................................................................. 2-1
2.4 Cooling .................................................................................................................................................... 2-1
2.5 Preliminary Operating Procedures .......................................................................................................... 2-6
2.5.1 Node Address (Channel Number) Selection...................................................................................... 2-6
2.5.2 Preliminary Operational Check.......................................................................................................... 2-7
2.6 Installation ............................................................................................................................................... 2-9
2.6.1 Bench Top Use.................................................................................................................................. 2-9
2.6.2 Rack Mounting................................................................................................................................... 2-9
2.6.3 “G” Option Selector (MG and MGR Models)...................................................................................... 2-9
2.7 Wiring Instructions................................................................................................................................... 2-9
2.7.1 Safety Grounding............................................................................................................................... 2-9
2.7.2 Source Power Connections ............................................................................................................... 2-9
2.7.3 D-C Output Grounding....................................................................................................................... 2-10
2.7.4 Power Supply/Load Interface............................................................................................................. 2-10
2.7.5 Load Connection - General................................................................................................................ 2-11
2.7.6 Load Connection Using Local Sensing.............................................................................................. 2-11
2.7.7 Load Connection Using Remote Sensing.......................................................................................... 2-11
2.8 Operating Configuration .......................................................................................................................... 2-11
2.9 RS 232 Connections ............................................................................................................................... 2-12
SECTION 3 - OPERATION
3.1 General.................................................................................................................................................... 3-1
3.1.1 Actual Mode....................................................................................................................................... 3-1
3.1.2 Commanded Mode ............................................................................................................................ 3-2
3.1.3 Local Mode ........................................................................................................................................ 3-2
3.1.4 Remote Mode .................................................................................................................................... 3-3
3.2 Local Mode Operation ............................................................................................................................. 3-3
3.2.1 Local Mode Controls and Indicators .................................................................................................. 3-3
3.2.1.1 Front Panel Controls and Indicators. ........................................................................................... 3-3
3.2.1.2 Keypad Operation ........................................................................................................................ 3-6
3.2.1.3 Turning the Power Supply On...................................................................................................... 3-6
3.2.1.4 Setting Local Mode ...................................................................................................................... 3-6
3.2.1.5 Enabling/Disabling DC Output Power.......................................................................................... 3-9
3.2.1.5.1 M and MG Models...................................................................................................................3-9
3.2.1.5.2 MR and MGR Models..............................................................................................................3-10
3.2.1.6 Setting Output Voltage or Voltage Limit ....................................................................................... 3-11
3.2.1.6.1 Using Vadj and Numeric Keys — M, MG Models ...................................................................3-11
3.2.1.6.2 Using Vadj and Numeric Keys — MR, MGR Models ..............................................................3-12
3.2.1.6.3 Procedure Using Vadj and Numeric Keypad...........................................................................3-13
3.2.1.6.4 Slew (
3.2.1.6.5 Slew ( and ) Keys — MR, MGR Models..........................................................................3-15
MBT 55-7 111609 i
and ) Keys — M, MG Models ...............................................................................3-14
TABLE OF CONTENTS (Continued)
SECTION PAGE
3.2.1.6.6 Voltage Control — M, MG Models.......................................................................................... 3-17
3.2.1.6.7 Voltage Control — MR, MGR Models..................................................................................... 3-18
3.2.1.7 Setting Output Current or Current Limit ...................................................................................... 3-19
3.2.1.7.1 Using Iadj and Numeric Keys — M, MG Models .................................................................... 3-19
3.2.1.7.2 Using Iadj and Numeric Keys — MR, MGR Models............................................................... 3-20
3.2.1.7.3 Procedure Using Iadj and Numeric Keypad ........................................................................... 3-22
3.2.1.7.4 Slew (
3.2.1.7.5 Slew ( and ) Keys — MR, MGR Models ......................................................................... 3-23
3.2.1.7.6 Current Control — M, MG Models.......................................................................................... 3-24
3.2.1.7.7 Current Control — MR, MGR Models..................................................................................... 3-25
3.2.1.8 Setting Voltage Mode or Current Mode....................................................................................... 3-27
3.2.1.8.1 M, MG Models ........................................................................................................................ 3-27
3.2.1.8.2 MR, MGR Models................................................................................................................... 3-27
3.2.1.9 Reversing DC Output Polarity — MR, MGR Models................................................................... 3-30
3.2.1.10 Changing the GPIB Address ....................................................................................................... 3-31
3.2.1.11 Local Mode Programming of the Power Supply.......................................................................... 3-32
3.2.1.11.1 Entering Program Mode ......................................................................................................... 3-34
3.2.1.11.2 Creating a New Program........................................................................................................ 3-34
3.2.1.11.3 Running a Program ................................................................................................................ 3-37
3.2.1.11.4 Modifying a Program .............................................................................................................. 3-38
3.2.1.11.5 Cycling a Program.................................................................................................................. 3-39
3.2.1.11.6 Stopping a Program ............................................................................................................... 3-39
3.2.1.11.7 Exiting Program Mode............................................................................................................ 3-40
3.2.1.11.8 Sample Program Operation - Models M, MG ......................................................................... 3-40
3.2.2 Using the Menu System.................................................................................................................... 3-43
3.2.2.1 Speaker On/Off ........................................................................................................................... 3-43
3.2.2.2 Controls Lock-out ........................................................................................................................ 3-43
3.2.2.3 Remote Channel ......................................................................................................................... 3-44
3.2.2.3.1 General Notes for Remote Configurations Using IEEE 1118 Bus.......................................... 3-44
3.2.2.3.2 Remote Operation Using Keypad to Control Another MBT Power Supply............................. 3-45
3.2.2.4 Calibration ................................................................................................................................... 3-47
3.2.2.5 OVP, OCP Set-up ....................................................................................................................... 3-47
3.2.2.6 Slew Key Increments Set-up....................................................................................................... 3-48
3.2.2.7 Remote Display Blanking ............................................................................................................ 3-49
3.2.2.8 GPIB Addressing Mode............................................................................................................... 3-49
3.2.2.9 Compatiblity Mode ...................................................................................................................... 3-49
3.2.2.10 Command Language................................................................................................................... 3-50
3.3 Remote Mode Programming................................................................................................................... 3-50
3.3.1 General ............................................................................................................................................. 3-51
3.3.2 IEEE 488 (GPIB) Bus Protocol ......................................................................................................... 3-51
3.3.2.1 String Parsing.............................................................................................................................. 3-52
3.3.3 RS232-C Bus Protocol...................................................................................................................... 3-53
3.3.3.1 RS 232 Implementation............................................................................................................... 3-53
3.3.3.2 Echo Mode .................................................................................................................................. 3-54
3.3.3.3 Prompt Method............................................................................................................................ 3-54
3.3.3.4 XON XOFF Method..................................................................................................................... 3-55
3.3.3.5 Special Commands ..................................................................................................................... 3-55
3.3.4 Programming Techniques to Optimize Power Supply performance ................................................. 3-55
3.3.5 SCPI Programming ........................................................................................................................... 3-56
3.3.5.1 SCPI Messages .......................................................................................................................... 3-56
3.3.5.2 Common Commands/Queries..................................................................................................... 3-56
3.3.5.3 SCPI Subsystem Command/Query Structure ............................................................................. 3-56
3.3.5.4 Program Message Structure ....................................................................................................... 3-58
3.3.5.4.1 Keyword ................................................................................................................................. 3-59
3.3.5.4.2 Keyword Separator................................................................................................................. 3-60
and ) Keys — M, MG Models .............................................................................. 3-22
ii MBT 55-7 111609
TABLE OF CONTENTS (Continued)
SECTION PAGE
3.3.5.4.3 Query Indicator........................................................................................................................3-60
3.3.5.4.4 Data.........................................................................................................................................3-60
3.3.5.4.5 Data Separator........................................................................................................................3-60
3.3.5.4.6 Message Unit Separator .........................................................................................................3-60
3.3.5.4.7 Root Specifier..........................................................................................................................3-60
3.3.5.4.8 Message Terminator ...............................................................................................................3-60
3.3.5.5 Understanding The Command Structure ..................................................................................... 3-61
3.3.5.6 Addressing Multiple Power Supplies............................................................................................ 3-61
3.3.5.7 Understanding The Command Structure ..................................................................................... 3-62
3.3.5.8 Program Message Syntax Summary ........................................................................................... 3-63
3.3.5.9 Status Reporting .......................................................................................................................... 3-63
3.3.5.9.1 STATUS REPORTING STRUCTURE ....................................................................................3-63
3.3.5.9.2 Operational Status Register....................................................................................................3-64
3.3.5.9.3 QUEStionable Status Register................................................................................................3-64
3.3.5.9.4 Multiple Logical Instruments....................................................................................................3-65
3.3.5.10 SCPI Program Example............................................................................................................... 3-67
3.3.6 CIIL Programming.............................................................................................................................. 3-67
SECTION 4 - THEORY OF OPERATION
4.1 Introduction.............................................................................................................................................. 4-1
4.1.1 Voltage Source. ................................................................................................................................. 4-1
4.1.2 Current Source .................................................................................................................................. 4-2
4.1.3 Voltage Mode..................................................................................................................................... 4-2
4.1.4 Current Mode..................................................................................................................................... 4-2
4.1.5 Voltage/Current Reference ................................................................................................................ 4-3
4.1.6 A/D Conversion.................................................................................................................................. 4-3
4.1.7 Voltage/Current Comparison Errors .................................................................................................. 4-4
4.1.8 Protective Circuits.............................................................................................................................. 4-4
4.1.8.1 Overvoltage/Overcurrent Protection ............................................................................................ 4-4
4.1.8.2 Overtemperature Protection......................................................................................................... 4-4
4.1.8.3 Power Loss Protection................................................................................................................. 4-4
4.1.8.4 Path Fault Protection ................................................................................................................... 4-5
4.1.8.5 Crowbar and Turn-off Circuit........................................................................................................ 4-5
4.1.9 Response Time.................................................................................................................................. 4-5
4.1.10 Retention of Programmed Values...................................................................................................... 4-6
4.1.11 Output Enable/Disable and Polarity Reversal Relays — MR, MGR Models ..................................... 4-6
4.1.12 Output Enable/Disable....................................................................................................................... 4-6
4.1.12.1 M, MG Models.............................................................................................................................. 4-6
4.1.12.2 MR, MGR Models ........................................................................................................................ 4-7
4.1.13 Local Control...................................................................................................................................... 4-7
4.1.13.1 Set Output Voltage/Current Limit (Voltage Mode) ....................................................................... 4-7
4.1.13.2 Set Output Current/Voltage Limit (Current Mode)........................................................................ 4-8
4.1.13.3 Set Voltage/Current Mode ........................................................................................................... 4-8
4.1.13.4 Output Enable/Disable................................................................................................................. 4-8
4.1.13.5 Programmable Parameters.......................................................................................................... 4-8
4.1.13.6 Status........................................................................................................................................... 4-9
4.1.13.7 Menu-selectable Parameters ....................................................................................................... 4-9
4.1.14 Remote Control.................................................................................................................................. 4-9
4.2 MBT Series Block Diagram Circuit Description ....................................................................................... 4-10
4.3 Detailed Circuit Descriptions ................................................................................................................... 4-12
4.3.1 Analog Control Board A1................................................................................................................... 4-13
4.3.2 Relay and Flags Board A2................................................................................................................. 4-14
4.3.3 Digital Control Board A3 .................................................................................................................... 4-14
4.3.4 Auxiliary Supply Board A4 ................................................................................................................. 4-15
4.3.5 Mother Board A5................................................................................................................................ 4-16
4.3.6 A-C Input Circuit and Main D-C Supply (Chassis A6)........................................................................ 4-16
4.3.7 Heat Sink Assembly A7 ..................................................................................................................... 4-16
MBT 55-7 111609 iii
TABLE OF CONTENTS (Continued)
SECTION PAGE
4.3.8 Front Panel Board A8 ....................................................................................................................... 4-17
4.3.9 Sensing Resistor and Crowbar Circuit A10....................................................................................... 4-18
4.3.10 Alphanumeric Display (LCD) A11 ..................................................................................................... 4-18
4.3.11 Keypad A12 ...................................................................................................................................... 4-18
4.3.12 "G" Option Components — MG, MGR Models ................................................................................. 4-18
4.3.12.1 Single Board Computer (SBC) A13 — MG, MGR Models .......................................................... 4-19
4.3.12.2 Interface Board A14 — MG, MGR Models................................................................................. 4-19
4.3.13 "R" Option Components — MR, MGR Models................................................................................. 4-19
APPENDIX A - SCPI COMMON COMMAND/QUERY DEFINITIONS
A.1 Introduction............................................................................................................................................. A-1
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 *OPT? — Options Query ........................................................................................................................ A-3
A.10 *RST — Reset Command....................................................................................................................... A-4
A.11 *SRE — Service Request Enable Command ........................................................................................ A-4
A.12 *SRE? — Service Request Enable Query .............................................................................................. A-4
A.13 *STB? — Status Byte Register Query ................................................................................................... A-5
A.14 *TRG — Trigger Command ................................................................................................................... A-5
A.15 *TST? — Self Test Query....................................................................................................................... A-6
A.16 *WAI — Wait-to-Continue Command ..................................................................................................... A-6
APPENDIX B - SCPI COMMAND/QUERY DEFINITIONS
B.1 Introduction............................................................................................................................................. B-1
B.2 INITiate[:IMMediate] Command.............................................................................................................. B-1
B.3 INITiate:CONTinuous Command............................................................................................................ B-2
B.4 INITiate:CONTinuous? Query ................................................................................................................. B-2
B.5 INSTrument:CATalog? Query ................................................................................................................. B-2
B.6 INSTrument[:NSELect]
B.7 INSTrument[:SELect] Command ............................................................................................................ B-3
B.8 INSTrument[:SELect]? Query................................................................................................................. B-3
B.9 INSTrument:STATe Command ............................................................................................................... B-3
B.10 MEASure[:SCALar]:CURRent[:DC]? Query ........................................................................................... B-3
B.11 MEASure[:SCALar][:VOLTage][:DC]? Query.......................................................................................... B-4
B.12 OUTPut[:STATe] Command ................................................................................................................... B-4
B.13 OUTPut[:STATe] Query .......................................................................................................................... B-4
B.14 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude] Command.......................................................... B-4
B.15 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude]?
B.16 [SOURce:]CURRent:[:LEVel]TRIGgered[:AMPlitude] Command.......................................................... B-5
B.17 [SOURce:]CURRent:[:LEVel]TRIGgered[:AMPlitude]? Query................................................................ B-5
B.18 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude]
B.19 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude]? Query ............................................................... B-6
B.20 [SOURce:]VOLTage:[:LEVel]TRIGgered[:AMPlitude] Command ........................................................... B-6
B.21 [SOURce:]VOLTage:[:LEVel]TRIGgered[:AMPlitude]? Query ................................................................ B-6
B.22 [SOURce:]FUNCtion:MODE Command ................................................................................................. B-7
B.23 STATus:OPERation:CONDition? Query................................................................................................. B-7
B.24 STATus:OPERation:ENABle Command................................................................................................. B-7
B.25 STATus:OPERation:ENABle? Query...................................................................................................... B-7
B.26 STATus:OPERation[:EVENt]? Query ..................................................................................................... B-7
Command.......................................................................................................... B-2
Query............................................................... B-4
Command .......................................................... B-6
iv MBT 55-7 111609
TABLE OF CONTENTS
SECTION PAGE
B.27 STATus:PRESet Command ................................................................................................................... B-7
B.28 STATus:QUEStionable[:EVENt]? Query ................................................................................................ B-8
B.29 STATus:QUEStionable:CONDition? Query............................................................................................ B-8
B.30 STATus:QUEStionable:ENABle Command............................................................................................ B-9
B.31 STATus:QUEStionable:ENABle? Query................................................................................................. B-9
B.32 STATus:QUEStionable:INSTrument? Query.......................................................................................... B-9
B.33 STATus:QUEStionable:INSTrument1? Query........................................................................................ B-9
B.34 STATus:QUEStionable:INSTrument2? Query........................................................................................ B-10
B.35 STATus:QUEStionable:INSTrument:ENABle Command........................................................................ B-10
B.36 STATus:QUEStionable:INSTrument:ENABle? Query ............................................................................ B-10
B.37 STATus:QUEStionable:INSTrument1:ENABle
B.38 STATus:QUEStionable:INSTrument1:ENABle? Query .......................................................................... B-11
B.39 STATus:QUEStionable:INSTrument2:ENABle Command...................................................................... B-11
B.40 STATus:QUEStionable:INSTrument2:ENABle? Query .......................................................................... B-11
B.41 STATus:QUEStionable:INSTrument:ISUM? Query................................................................................ B-11
B.42 STATus:QUEStionable:INSTrument:ISUM:ENABle Command.............................................................. B-11
B.43 STATus:QUEStionable:INSTrument:ISUM:ENABle? Query .................................................................. B-11
B.44 SYSTem:COMMunication:GPIB:ADDRess Command........................................................................... B-11
B.45 SYSTem:COMMunication:SERial:BAUD
B.46 SYSTem:COMMunication:SERial:ECHO Command.............................................................................. B-12
B.47 SYSTem:COMMunication:SERial:PACE Command .............................................................................. B-12
B.48 SYSTem:COMMunication:SERial::PROMpt Command ......................................................................... B-12
B.49 SYSTem:ERRor[:NEXT]? Query ............................................................................................................ B-12
B.50 SYSTem:ERRor:CODE? Query ............................................................................................................. B-12
B.51 SYSTem:ERRor:CODE:ALL? Query ...................................................................................................... B-12
B.52 SYSTem:LANGuage Command ............................................................................................................. B-12
B.53 SYSTem:SET Command........................................................................................................................ B-13
B.54 SYSTem:VERSion Query ....................................................................................................................... B-13
Command ..................................................................... B-10
Command............................................................................. B-12
APPENDIX C - CIIL COMMAND DEFINITIONS
MBT 55-7 111609 v
TABLE OF CONTENTS
SECTION PAGE
vi MBT 55-7 111609
LIST OF FIGURES
FIGURE TITLE PAGE
1-1 MBT Series Programmable Power Supply..................................................................................................... x
1-2 MBT Series Power Supply, Mechanical Outline Drawing ........................................................................... 1-4
1-3 Remotely Controlled Power Supply Configurations Using Kepco Products................................................ 1-6
2-1 MBT Series Front Panel Controls and Indicators........................................................................................ 2-2
2-2 MBT Series Internal Controls Accessible Through Top Cover.................................................................... 2-2
2-3 MBT Series Rear Panel Connections ......................................................................................................... 2-5
2-4 Connector Pin Assignments........................................................................................................................ 2-5
2-5 Grounded Load Connections, Local Sensing ............................................................................................. 2-13
2-6 Isolated Load Connections, Local Sensing ................................................................................................. 2-13
2-7 Grounded Load Connections, Remote Sensing ......................................................................................... 2-14
2-8 Isolated Load Connections, Remote Sensing ............................................................................................. 2-14
3-1 Sample Program Operation for M, MG Models........................................................................................... 3-41
3-2 Sample Program Operation for MR, MGR Models...................................................................................... 3-42
3-3 RS 232 Implementation .............................................................................................................................. 3-54
3-4 Tree Diagram of SCPI Commands Used with MBT-G Power Supplies ...................................................... 3-58
3-5 Message Structure...................................................................................................................................... 3-59
3-6 Status Reporting Structure.......................................................................................................................... 3-65
3-7 Expansion of QUEStionable Register for Multiple Logical Instruments ...................................................... 3-66
3-8 Typical Example Of MBT-G Power Supply Program Using SCPI Commands ........................................... 3-67
4-1 Crossover Characteristics of the MBT Power Supply Showing the
Critical or Crossover Value of Load Resistance Rlx................................................................................. 4-1
4-2 Voltage Comparison Equivalent Circuit ...................................................................................................... 4-2
4-3 Current Comparison Equivalent Circuit....................................................................................................... 4-3
4-4 MBT Series Power Supply, Overall Block Diagram .................................................................................... 4-11
4-5 MBT Series Power Supply, Location of Major Components ....................................................................... 4-12
A-1 GPIB Commands ....................................................................................................................................... A-3
A-2 Using the *WAIt-to-continue Command ..................................................................................................... A-6
B-1 Use of INSTrument:CATalog Query ......................................................................................................... B-2
B-2 Identifying and Selecting Devices on BITBUS ........................................................................................... B-3
B-3 Programming the Output............................................................................................................................ B-5
B-4 Programming Current ................................................................................................................................ B-6
B-5 Using Status Commands and Queries....................................................................................................... B-8
C-1 FNC — Function Command....................................................................................................................... C-1
C-2 INX — Initiate Op Code Command............................................................................................................ C-2
C-3 FTH — Fetch Command............................................................................................................................ C-2
C-4 SET Command .......................................................................................................................................... C-3
C-5 OPN, CLS — Open, Close Relay Commands ........................................................................................... C-4
C-6 RST — Reset Command ........................................................................................................................... C-4
C-7 CNF, IST — Confidence Test, Internal Self Test Commands.................................................................... C-4
C-8 STA — Status Command........................................................................................................................... C-5
C-9 GAL — Go to Alternate Language Command .......................................................................................... C-6
MBT 55-7 111609
vii
LIST OF FIGURES (Continued)
FIGURE TITLE PAGE
viii MBT 55-7 111609
LIST OF TABLES
TABLE TITLE PAGE
1-1 Model Parameters .......................................................................................................................................1-1
1-2 General Specifications ................................................................................................................................1-2
1-3 Equipment Supplied ....................................................................................................................................1-7
1-4 Accessories .................................................................................................................................................1-7
2-1 Internal Controls Accessible Through Top Cover .......................................................................................2-3
2-2 Input/Output Pin Assignments for Remote Control .....................................................................................2-4
2-3 Node Address Selection .............................................................................................................................2-6
2-4 Internal Jumper Configuration .....................................................................................................................2-12
3-1 Front Panel Controls And Indicators ...........................................................................................................3-3
3-2 Key Functions .............................................................................................................................................3-4
3-3 Using Vadj and Keypad Entries To Set Output Voltage/Voltage Limit — Models M, MG ..........................3-12
3-4 Using Vadj and Keypad Entries To Set Output Voltage/Voltage Limit — Models MR, MGR ....................3-13
3-5 Using Slew Keys (
3-6 Using Slew Keys ( and ) to Set Output Voltage/Voltage Limit — Models MR, MGR ........................3-16
3-7 Using Voltage Control to Set Output Voltage/Voltage Limit — Models M, MG .........................................3-17
3-8 Using Voltage Control To Set Output Voltage/Voltage Limit — Models MR, MGR ....................................3-18
3-9 Using Iadj and Keypad Entries to Set Output Current/Current Limit — Models M, MG .............................3-20
3-10 Using Iadj and Keypad Entries To Set Output Current/Current Limit — Models MR, MGR .......................3-21
3-11 Using Slew Keys (
3-12 Using Slew Keys ( and ) to Set Output Current/Current Limit — Models MR, MGR ..........................3-24
3-13 Using Current Control To Set Output Current/Current Limit — Models M, MG .........................................3-25
3-14 Using Current Control to Set Output Current/Current Limit — Models MR, MGR .....................................3-26
3-15 Programming Mode Screens ......................................................................................................................3-33
3-16 Default Parameters for New Added Steps ..................................................................................................3-34
3-17 Sample Program (Assigned Program #2) ...................................................................................................3-35
3-18 Menu Functions ..........................................................................................................................................3-43
3-19 MBT-G Compatibility Modes .......................................................................................................................3-50
3-20 IEEE 488 (GPIB) Bus Interface Functions ..................................................................................................3-51
3-21 IEEE 488 (GPIB) Bus Command Mode Messages .....................................................................................3-52
3-22 IEEE 488 (GPIB) Bus Data Mode Messages ..............................................................................................3-52
3-23 XON XOFF Control .....................................................................................................................................3-55
3-24 SCPI Command Index ................................................................................................................................3-57
3-25 Rules Governing Shortform Keywords ........................................................................................................3-59
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-7
B-3 Questionable Event Register, Questionable Condition Register
and Questionable Condition Enable Register Bits ..................................................................................B-9
B-4 Questionable Instrument Register 0 Bits ...................................................................................................B-9
B-5 Questionable Instrument Register 1 Bits ...................................................................................................B-10
B-6 Questionable Instrument Register 2 Bits ...................................................................................................B-10
B-7 Error Messages .......................................................................................................................................... B-13
C-1 CIIL Subsystem Command/query Index ....................................................................................................C-1
C-2 CIIL Error Messages .................................................................................................................................. C-5
C-3 CIIL Error Handling Utility Commands .......................................................................................................C-6
and ) to Set Output Voltage/Voltage Limit — Models M, MG ...............................3-15
and ) to Set Output Current/Current Limit — Models M, MG ...............................3-23
MBT 55-7 111609 ix
FIGURE 1-1. MBT SERIES PROGRAMMABLE POWER SUPPLY
x MBTSVC111609
1.1 SCOPE OF MANUAL
This manual contains instructions for the installation and operation of the MBT series of 360
Watt (half rack), voltage and current stabilized d-c power supplies manufactured by Kepco, Inc.,
Flushing, New York, U.S.A.
1.2 GENERAL DESCRIPTION
The Kepco MBT Power Supply Series (Figure 1-1) consists of eight single-output models as
listed in Table 1-1. All models can be delivered with the following options, indicated as a suffix to
the Model Number (see PAR. 1.5):
M- basic unit
MG- with single board computer
MR- with output/polarity reversal relays
MGR- with single board computer and output/polarity reversal relays
MBT Series Power Supplies are of a stand-alone, bench top design whose half-rack cross section
permits mounting in a standard Kepco rack adapter (see Table 1-4). MBT Series Power Supplies
can be operated with 115V/230V (switch selectable) nominal a-c input power sources (47 - 63Hz).
FIGURE 0-1.
SECTION 1 - INTRODUCTION
MBT Series Power Supplies employ linear stabilization for accuracy and resolution. MBT Power
Supplies are full-range, automatic-crossover voltage/current stabilizers with a full rectangular output characteristic. The MBT is controlled digitally with 12 bits of resolution over the entire voltage/
current range. Voltage and current are displayed on an alphanumeric LCD display. The operational
status of the unit is displayed by five front panel LED's: VOLTAGE MODE, CURRENT MODE,
REVERSED POLARITY, REMOTE, and OUTPUT ENABLED. Control of the MBT can either be
local (via the from panel controls and keypad) or remote (via the IEEE 1118 communication bus, or
for option MG and MGR units, via the RS232C and IEEE 488.2 communication buses).
1.3 SPECIFICATIONS
Table 1-1 below indicates parameters that vary for different MBT models; Table 1-2 lists general
specifications that apply to all MBT models.
MODEL NUMBER
MBT 6-32M 0-6 0-32 192
MBT 15-20M 0-15 0-20 300
MBT 25-14M 0-25 0-14 350
MBT 36-10M 0-36 0-10 360
MBT 55-7M 0-55 0-7 385
MBT 75-5M 0-75 0-5 375
MBT 100-3.6M 0-100 0-3.6 360
TABLE 1-1. MODEL PARAMETERS
OUTPUT VOLTAGE RANGE
(VOLTS)
OUTPUT CURRENT RANGE
(AMPS)
MAXIMUM OUTPUT POWER
(WATTS)
MBT 150-2.4M 0-150 0-2.4 360
MBTSVC111609 1-1
TABLE 1-2. GENERAL SPECIFICATIONS
CHARACTERISTIC REQUIREMENT
INPUT
A-c Voltage (User selectable) 105-125V/210-250V a-c
A-c Input Frequency Range 47-63 Hz
115V a-c
A-c Input Current
Voltage/Current Adjustment
Range
Remote Sensing Range 0.5V per lead
D-C Isolation Voltage 500V d-c
Enable/Disable Output Power Using front panel or via the Digital Bus.
Polarity Reversal
(MR and MGR models only)
Protection
Programming Resolution/Accuracy
Data Read-back Accuracy
Output Display
Indicators (LED)
(nominal)
230V a-c
(nominal)
0 - 100% of rating, either continuously (inherent resolution), by step or by programmed setting.
Built-in polarity reversal power & sense relays.
Overvoltage Tracks programmed voltage, crowbars output & turns off input circuit
Overcurrent Tracks programmed current, crowbars output & turns off input circuit
Overtemperature Monitors heatsink temperature, crowbars output & turns off input circuit
External Polarity
Reversal
Power Loss Detects loss of a-c input power, disables output & turns
Overvoltage or
interruption
between Power
and Sensing Leads
Voltage 0.024% E
Current 0.024% I
Voltage 0.1% E
Current 0.15% I
2X16 Char. Alphanumeric LCD with LED Backlight Indicates Output Voltage, Output Current, Status and Menu. Output voltage displayed by four digits with either three, two, or one decimal(s),
depending on Model; output current displayed by either three or four digits (depending on Model)
with two decimals.
VOLTAGE MODE Green; lit when unit is in voltage mode.
CURRENT MODE Amber; lit when unit is in current mode.
POLARITY
REVERSED
REMOTE Green; lit when unit is operating in remote mode.
OUTPUT
ENABLED
7.5 Amperes
3.7 Amperes
OUTPUT
breaker.
breaker.
breaker.
Built-in diode protects unipolar supply output.
off input circuit breaker.
MR and MGR Models:
M and MG Models:
CONTROL-INDICATORS
Programming Resolution Accuracy
(12 Bits) 0.024% E
OMAX
(12 Bits) 0.1% I
OMAX
OMAX
OMAX
Red; lit when polarity reversed. (Operational for MR and MGR Models only.)
Green; lit when output is enabled.
Output voltage and current programmed to zero
and output relays opened.
Output voltage and current programmed to zero
and/or output crowbar activated and input circuit
breaker turned off
OMAX
OMAX
1-2 MBTSVC111609
TABLE 1-2. GENERAL SPECIFICATIONS (CONTINUED)
CHARACTERISTIC REQUIREMENT
STATIC
Source Effect
Load Effect
Time Effect (8 Hour Drift)
Temperature Coefficient
(per oC)
Ripple & Noise (rms/p-p)
Series/Parallel Operation Consult Kepco applications engineering.
Leakage Current Common mode current: 5
Temperature
Cooling Built-in fan, exhausts air to rear.
D-C Output Terminals Binding posts; barrier strip for remote sensing and monitor connections.
Local voltage/current control
Remote Error Sensing Provision for 4-terminal (Kelvin) connection to load; static drop of up to 0.5V/lead may be compen-
Voltage Recovery for a Step
Load Current
Dimensions See Figure 1-2.
Weight (lbs.) Model M: 35; Models MR, MG: 36; Model MGR:37
Source Connections Detachable IEC type 3-wire power entry.
Load Connections Binding Post
Remote Control Signal
Connections
Sense, Monitor Connections Barrier strip
Voltage 0.001% E
Current 0.005% I
Voltage 0.002% E
Current 0.024% I
Voltage 0.01% E
Current 0.02% I
Voltage 0.01% E
Current 0.02% I
Voltage 0.001%/0.01% E
Current 0.03%/0.3% I
Storage
Operating
Output can be controlled by entering the desired value via front panel keypad or continuously
(inherent resolution) adjusted via front panel control knobs.
sated.
100
µsec typical, 150 µsec max to recover within 10mV for a 10% to 100% step in rated load cur-
rent.
IEEE 1118 Two 9-Pin D-type connectors (female) in parallel for input/output daisy
RS232-C 9-Pin D-type connector (male)
IEEE 488 24-Pin connector (female)
−20
0o C to 50o C
chain.
OMAX
OMAX
OMAX
or 4mA (whichever is greater)
OMAX
OMAX
OMAX
OMAX
OMAX
or 0.3mV/3mV (whichever is greater)
OMAX
OMAX
MISCELLANEOUS
µA rms or 50 µA p-p @ 115V a-c
o
C to +70o C
PHYSICAL
MBTSVC111609 1-3
FIGURE 1-2. MBT SERIES POWER SUPPLY, MECHANICAL OUTLINE DRAWING
1-4 MBTSVC111609
1.4 FEATURES
1.4.1 LOCAL CONTROL
Two front panel optical encoder controls and/or keypad entries are utilized for setting and
adjusting output voltage and current under Local control. The keypad's keys are organized to
either directly execute commands, or to introduce a program that can either run once or be
cycled. Calibration of the unit is facilitated by a menu-driven procedure.
1.4.2 REMOTE CONTROL
Figure 1-3 shows remotely controlled Power Supply configurations using Kepco products.
All MBT models can be remotely controlled via the IEEE 1118 serial bus using the following
Kepco Power Supply Controllers (MG and MGR Models must have the “G” option disabled):
• TMA PC-27 Plugs into a DOS-compatible PC (half-card slot).
• TMA 4882-27 Stand-alone unit, connected to an RS232C or IEEE 488 bus.
• MST 488-27 Module (1/9 rack), plugs in Kepco RA 55 Rack Adapter where it inter-
• TMA VXI-27 Module, plugs into VXI main frame equipped with a GPIB Controller
faces with an RS232C or IEEE 488 bus.
Module; without a GPIB Controller, you must have a VXI-based embedded CPU and a TMA VXI-27 module.
MBT Power Supplies can also be controlled remotely via the keypad of any MBT Series Power
Supply connected to the daisy chain as long as there is one Models MG or MGR power supply
with the “G” option enabled included in the daisy chain. MBT Models MG and MGR with the “G”
option enabled can be controlled directly via the RS232-C bus or the IEEE 488 bus.
1.5 OPTIONS
1.5.1 OPTION G - SINGLE BOARD COMPUTER
The Single Board Computer (SBC) included on “G” option models (MG and MGR) enables the
RS232-C and GPIB (IEEE 488) communication buses and permits an MBT power supply to
function as a “master” to control other power supplies. A switch accessible through the top cover
allows disabling of the “G” Option circuitry to allow a “G” option unit to function as a “slave” and
be controlled by another “G” option unit functioning as a “master”. In configurations with more
than one MBT Series Power Supply, only one unit can have the “G” option enabled; if other “G”
option units are used, the “G” option must be disabled.
1.5.2 OPTION R - OUTPUT/POLARITY REVERSAL RELAYS
MBT units with the “R” option (MR and MGR) contain Output/Polarity Reversal relays and associated control circuits, allowing the output to be enabled/disabled, polarity reversed and the local
selection of current mode (with the output disabled) by connecting an internal shunt across the
output. Disabling the MBT as a voltage source requires opening the connection between the
MBT and its load. Disabling the MBT as a current source requires that the MBT output terminals
be shorted. The Polarity Reversal relays permit two-quadrant operation of the MBT.
MBTSVC111609 1-5
1-6 MBTSVC111609
FIGURE 1-3. REMOTELY CONTROLLED POWER SUPPLY CONFIGURATIONS USING KEPCO PRODUCTS
1.6 EQUIPMENT SUPPLIED
Equipment supplied with the unit is listed in Table 1-3.
TABLE 1-3. EQUIPMENT SUPPLIED
ITEM SUPPLIED WITH MODEL
Power Cord All units 118-0557
Cable with two 9-pin connectors for IEEE 1118 bus All units 118-0844
Terminator for IEEE 1118 bus All units 195-0086
PART NUMBER
1.7 ACCESSORIES
Accessories for the MBT Power Supply are listed in Table 1-4.
TABLE 1-4. ACCESSORIES
ITEM FUNCTION
Cable - two 5-pin connectors Daisy chain Kepco Power Supplies with 5-pin
connectors on IEEE 1118 bus.
Cable - one 5-pin and one 9-pin connector, ~6 ft. (2 m) Daisy chain MBT Power Supply and Kepco
Cable - one 5-pin and one 9-pin connector, ~12 ft. (4 m)
Cable - two 9-pin connectors, ~ 12 ft. (4 m) Daisy chain MBT Power Supply and Kepco
Rack Adapter Allows rack mounting of two MBT Series Power
Power Supplies with 5-pin connector on IEEE
1118 b u s.
Power Supplies with 9-pin connector on IEEE
1118 b u s.
Supplies in a standard 19-inch rack (see Figure
1-2).
PART NUMBER
118-0699
118-0749
118-0852
118-0853
RA 37
Filler plate Facilitate installation of MBT Power Supply in
RA 37 Rack Adapter.
Connector Mating connector for model MBT-G RS323C
connector.
128-1773 (left)
128-1774 (right)
143-0296
MBTSVC111609 1-7/1-8
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 Section 2.5. If any indication of damage
is found, file an immediate claim with the responsible transport service.
2.2 TERMINATIONS AND CONTROLS
a) Front Panel: Refer to Figure 2-1 and Table 3-1.
b) Internal Controls: Refer to Figure 2-2 and Table 2-1.
c) Rear Panel: Refer to Figure 2-3 and Table 2-2.
2.3 SOURCE POWER REQUIREMENTS
BEFORE APPLYING THE A-C SOURCE TO THE POWER SUPPLY, VERIFY THAT THE LINE VOLTAGE TO BE SUPPLIED MATCHES THE POSITION OF THE AC INPUT SELECTOR SWITCH AT THE REAR PANEL
(FACTORY DEFAULT IS 115V).
WARNING
This power supply operate with the installed circuit breaker from single phase a-c mains power
over the specified voltage and frequency ranges without adjustment or modification. The AC
INPUT SELECTOR switch located on the rear panel (Figure 2-3) allows selection of either 115V
a-c or 230V a-c source power.
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 an internal cooling fan. The fan
operates at low speed for low ambient temperatures and low internal dissipated power, and at
high speed for high ambient temperature and/or high internal dissipated power. ALL INLET AND
EXHAUST OPENINGS AROUND THE POWER SUPPLY CASE MUST BE KEPT CLEAR OF
OBSTRUCTION TO ENSURE PROPER AIR ENTRY AND EXHAUST. Periodic cleaning of the
power supply interior is recommended. 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).
MB T SVC 111 60 9 2-1
FIGURE 2-1. MBT SERIES FRONT PANEL CONTROLS AND INDICATORS
FIGURE 2-2. MBT SERIES INTERNAL CONTROLS ACCESSIBLE THROUGH TOP COVER
2-2 MBTSVC 111609
REFERENCE
DESIGNATION
TABLE 2-1. INTERNAL CONTROLS ACCESSIBLE THROUGH TOP COVER
CONTROL PURPOSE
A1R28 I
A1R20 E
A1R15 I
(NOTE 1) Used to adjust output current of power supply to initial value.
O ZERO
(NOTE 1) Used to adjust output voltage of power supply to zero.
O ZERO
CURRENT SENSING ZERO
(NOTE 1) Used to adjust current monitor amplifier to zero.
CONDITIONS: current mode, shunt at the output.
CONDITIONS: voltage mode, no load.
CONDITIONS: voltage mode, no load.
A1R16 I
A1R11 V
A1R12 I
FULL SCALE CURRENT ADJUST
(NOTE 1)
(NOTE 1) Used to calibrate full scale voltage.
REF
(NOTE 1) Used to adjust internal full scale current.
REF
Used to calibrate the full scale value of the output current.
CONDITIONS: current mode, shunt at the output.
CONDITIONS: voltage mode, no load.
CONDITIONS: current mode, shunt at the output.
A8S1 “G” Option Selector (NOTE 2) “G” Option Selector (NOTE 2)“G” option units only: Enables/Disables “G”
Option circuits so unit can function as “slave” unit under control of
another “G” option unit functioning as a “master.” Factory default position
is ON: unit functions as a “master.”
A8R7 Display Contrast Adjust Adjusts contrast of front panel alphanumeric display.
A3S1 Node Address (NOTE 3) Used to select Node address (node number or channel number) of the
MBT Power Supply from 1 - 31
A1TP1 Test Points Provides four test points used for testing/calibration
1 -CURRENT REFERENCE
2 -CURRENT MONITOR
3 - VOLTAGE REFERENCE
4 - COMMON
NOTES:
1. These adjustments must be done in accordance with the calibration procedure (see PAR. 5.5 or refer to procedure available at MBT front panel by entering MENU and selecting CALIBRATION (see PAR. 3.2.2.4).
2. This switch is not included on some older models; refer to Kepco applications engineering for assistance in disabling the
“G” option.
3. The NODE ADDRESS selector is not accessible through top cover on some older models; it is necessary to remove the
top cover to set the node address.
MB T SVC 111 60 9 2-3
TABLE 2-2. INPUT/OUTPUT PIN ASSIGNMENTS FOR REMOTE CONTROL
CONNECTOR PIN SIGNAL NAME FUNCTION
1 SGND Signal Ground
2RXD Receive Data
3 TXD Transmit Data
4 DTR ( not used)
RS232-C
J4
IEEE 1118
INPUT/OUTPUT
J2, J3
IEEE 488
PORT
J5
5 SGND Signal Ground
6 DSR See Note.
7 RTS See Note.
8 CTS Clear To Send (protocol not used)
9 SGND Signal Ground
NOTE: Jumper installed beteen DSR and RTS allows secondary GPIB addressing if SCPI mode (see
Table 2-4) is selected
1 Not used
2 SHIELD Shield
3 IEEE 1118 BUS Communicate via IEEE 1118 bus
4 Not used
5 Not used
6 Not used
7 SHIELD Shield
8 IEEE 1118 BUS Communicate via IEEE 1118 bus
9 Not used
1D
2D
3D
4D
5 EOI End or Identify
6 DAV Da ta Vali 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
14 D
15 D
16 D
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
I01 I/O Line
I02 I/O Line
I03 I/O Line
I04 I/O Line
I05 I/O Line
I06 I/O Line
I07 I/O Line
I08 I/O Line
2-4 MBTSVC 111609
FIGURE 2-3. MBT SERIES REAR PANEL CONNECTIONS
FIGURE 2-4. CONNECTOR PIN ASSIGNMENTS
MB T SVC 111 60 9 2-5
2.5 PRELIMINARY OPERATING PROCEDURES
After the unit is unpacked, and before the unit is installed, the following procedure is required to
set the node address.
2.5.1 NODE ADDRESS (CHANNEL NUMBER) SELECTION
The node address is set by Node Address selector DIP switch A3S1 accessed through the top
cover (see Figure 2-2). The address can be set to any number from 1 to 31 by setting the switch
positions to the binary value as shown in Table 2-3.
TABLE 2-3. NODE ADDRESS SELECTION
SELECTOR SWITCH SECTION
DECIMAL
ADDRESS
100001
200010
300011
400100
500101
600110
700111
801000
901001
1001010
1101011
1201100
1301101
1401110
1501111
1610000
1710001
1810010
1910011
2010100
2110101
2210110
2310111
2411000
2511001
2611010
2711011
2811100
2911101
3011110
3111111
A3S1-4
(A4)
A3S1-3
(A3)
(SIGNAL LINE)
A3S1-2
(A2)
A3S1-1
(A1)
A3S1-0
(A0)
2-6 MBTSVC 111609
2.5.2 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 2-3 for location of operating controls and electrical connections. Tables 3-1 and 32 explain the functions of operating controls/indicators and keypad keys, respectively.
BEFORE APPLYING THE A-C SOURCE TO THE POWER SUPPLY, VERIFY THAT THE LINE VOLTAGE TO BE SUPPLIED MATCHES THE POSITION OF THE AC INPUT SELECTOR SWITCH AT THE REAR PANEL
(FACTORY DEFAULT IS 115V).
1. With no load connected, set POWER circuit breaker to the ON position. As shown below, the
alphanumeric display indicates the model and options; VOLTAGE MODE status indicator is
on, all other status indicators are off.
STATUS
WARNING
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
KEPCO, INC.
MBT 100-3.6MGR
2. After approximately 2 seconds, the display changes to:
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
Output is OFF
***V ***A
3. Rotate VOLTAGE control first clockwise, then counterclockwise; verify voltage shown on display increases for clockwise rotation and decreases for counterclockwise rotation. If the voltage control has no effect, refer to PAR.s 3.2.2 and 3.2.2.2 to check whether the adjustments
are locked; unlock adjustments if necessary.
NOTE: If the voltage (or current) does not increase beyond a certain point, press SHIFT then
“.” keys (STATUS command) to see the overvoltage protection (OVP) and overcurrent
protection (OCP) values. Refer to PAR.s 3.2.2 and 3.2.2.5 set new values if necessary.
NOTE: ***V and ***A are the output volt-
age and current settings in effect
at time of last operation (for first
time use, the voltage and current
are set to 0).
4. Verify short beeps are audible when VOLTAGE control is rotated. If beeps are not heard
refer to PAR.s 3.2.2 and 3.2.2.1 to check whether the speaker is disabled; enable speaker if
necessary.
5. Rotate CURRENT control first clockwise, then counterclockwise; verify current shown on
display increases for clockwise rotation and decreases for counterclockwise rotation. Verify
short beeps are audible when CURRENT control is rotated.
MB T SVC 111 60 9 2-7
6. Press slew keys, first , then ; verify that beeps are heard and displayed programmed
voltage increases when , is pressed and decreases when
is pressed.
7. Press Vadj key, then enter a numeric value within the voltage range of the power supply and
press ENTER key. Verify that the display shows the new value for programmed voltage.
8. Press Iadj key, then enter a numeric value within the current range of the power supply and
press ENTER key. Verify that the display shows the new value for programmed current.
9. Connect a digital voltmeter (DVM) (see PAR. 5.5.1.a) to the OUTPUT and COMMON terminals at the rear panel.
10.Program the nominal value for current as specified in step 8 above (the nominal value refers
to the rating of the unit, e.g., for the MBT 100-2.4, nominal voltage is 100V and nominal cur-
rent is 2.4A).
11. Press DC ON to enable the output of the unit. The OUTPUT ENABLED status indicator goes
on and the display shows the actual output voltage and current (current = 0A) of the power
supply.
NOTE: If tolerances specified in the following steps are exceeded, calibration adjustments
may have changed during transit; refer to PAR. 5.5 and recalibrate the unit.
12.Compare the voltage shown on the front panel display with the voltage reading of the DVM;
the difference between the two should not exceed 0.1% of the nominal voltage of the unit.
13.Repeat step 7 using a different value for programmed voltage and compare the programmed
voltage with the voltage reading of the DVM; the difference between the two should not
exceed 0.024% of the nominal voltage of the unit.
14.Disable the output by pressing DC OFF key and repeat step 8 above using a different value
for output current.
15.Disconnect DVM and connect precision shunt (see PAR. 5.5.1.b) across OUTPUT and
COMMON terminals at rear panel; connect DVM across shunt (sensing terminals) and program nominal value for voltage.
16.Press DC ON key to enable the output of the unit. Verify VOLTAGE MODE indicator goes off
and CURRENT MODE indicator goes on. Verify that front panel display shows a small value
for output voltage (R
for current programmed in step 14. Note DVM reading (V
rent using the formula V
x I
S
where RS = resistance of shunt in ohms) and the actual value
Oprog
DVM
/RS.
) and calculate the output cur-
DVM
17.Compare the output current value shown on the front panel display with the value calculated
above (step 16); the difference between the two should not exceed 0.15% of the nominal
current of the unit.
18.Repeat step 8 using a different value for programmed current and compare the programmed
current. Calculate the output current using the DVM voltage (see step 16), then compare the
programmed current with the calculated output current; the difference between the two
should not exceed 0.1% of the nominal current of the unit.
19.Disable the output by pressing DC OFF key and turn off power supply.
2-8 MBTSVC 111609
2.6 INSTALLATION
2.6.1 BENCH TOP USE
If the unit is to be used as a bench top instrument, a bail located on the bottom of the unit can be
utilized to raise the front of the unit about two inches for ease of accessing the front panel controls, indicators, keypad, and LCD display.
2.6.2 RACK MOUNTING
If the unit is to be rack-mounted, refer to Figure 1-2 for instructions.
2.6.3 “G” OPTION SELECTOR (MG AND MGR MODELS)
If the unit is to be incorporated into a remote-controlled power system (Figure 1-3), certain considerations have to met:
• The Power System can only have one controller; therefor only one MBT Power Supply in
the system can have the “G” option enabled. To disable the “G” option on additional MBT
units in the Power System, set the “G” option ON/OFF selector switch accessed through
the top cover (Figure 2-2) to OFF. For “G” option models without this switch, contact
Kepco Inc. or a local representative for assistance. If controller other than an MBT “G”
option unit is used, disable the “G” option of all MBT units.
• Control of any MBT Power Supply in the system is possible from any MBT unit's keypad
in the “daisy chain” configured Power System.
• A remotely controlled Power System can have as many as 27 units. Each power supply
in the system must have a unique node address (see PAR. 2.5.1).
2.7 WIRING INSTRUCTIONS
Interconnections between an a-c power source and a 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.
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. The ground terminal of the source power connector (figure
2-4) is connected the the MBT chassis and 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 CONNECTIONS
Source power is connected to the power supply via the three-wire power input cable supplied.
MB T SVC 111 60 9 2-9
2.7.3 D-C OUTPUT GROUNDING
Connections between the power supply and the load and sensing connections may, despite all
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 output binding posts of MBT 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. Grounding a single point in the output circuit can be of great importance. 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.
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
2-10 MBTSVC 111609
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 size
with regard to minimum voltage drop, but 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: error sensing cannot compensate for reactive effects due to this. These dynamic
conditions are especially important if the load is constantly modulated or step-programmed, or
has primarily reactive characteristics, or where the dynamic output response of the power supply is critical to load performance.
2.7.5 LOAD CONNECTION - GENERAL
Load connections to the MBT power supply are achieved via the OUTPUT and COMMON binding posts located on the rear panel. A barrier strip is provided at the rear panel for connection of
error sensing and monitor connections.
NOTE REGARDLESS OF OUTPUT CONFIGURATION, OUTPUT SENSE LINES MUST BE
CONNECTED FOR OPERATION. OBSERVE POLARITIES: THE OUTPUT S SENSING WIRE MUST BE CONNECTED TO THE OUTPUT LOAD WIRE, AND THE COM
S SENSING WIRE MUST BE CONNECTED TO THE COMMON LOAD WIRE. IF
LOCAL SENSING IS USED, INSTALL LINKS AS SHOWN IN FIGURE 2-3.
For M and MG units (non-“R” option), the OUTPUT binding post is always positive with respect
to COMMON. For MR and MGR units, the OUTPUT is positive with respect to COMMON when
polarity is nonreversed, negative with respect to COMMON when polarity is reversed.
2.7.6 LOAD CONNECTION USING LOCAL SENSING
Figure 2-5 shows a typical configuration using local sensing and a grounded load; Figure 2-6
shows a typical configuration using local sensing with an isolated (“floating”) load.
2.7.7 LOAD CONNECTION USING REMOTE SENSING
Figure 2-7 shows a typical configuration using remote sensing and a grounded load; Figure 2-8
shows a typical configuration using remote sensing with an isolated (“floating”) load.
2.8 OPERATING CONFIGURATION
The complete operating configuration is defined by
• The Model Number (e.g. MBT 100-3.6M)
• Options included (“G” or “R,” see PAR. 1.5)
• Jumper configuration of internal boards.
Table 2-4 lists the location of the internal jumpers and their function. This information is provided
for reference purposes only, to indicate the configuration options available. Do not attempt to
alter the jumper configuration. For assistance in changing any jumper-selected parameter contact Kepco applications engineering.
MB T SVC 111 60 9 2-11
LOCATION FUNCTION
Establish the
Model
A1
Path Fault
Protection
Input Power Loss
Protection
A2
Control of OUTPUT ENABLED
Status Indicator
(M, MG Models
only)
Control of
Programming
A13
A14
Language
Permits Selection
of Secondary
Address
Determines
External Cable
Shield Connection
TABLE 2-4. INTERNAL JUMPER CONFIGURATION
JUMPER
INSTALLED
J1-J5 MBT 6-32M (G) (R)
J1-J4 J5 MBT 15-20M (G) (R)
J1-J3, J5 J4 MBT 25-14M (G) (R)
J1-J3 J4, J5 MBT 36-10M (G) (R)
J1, J2, J4, J5 J3 MBT 55-7M (G) (R)
J1, J2, J4 J3, J5 MBT 75-5M (G) (R)
J1, J2, J5 J3, J4 MBT 100-3.6M (G) (R)
J1, J2 J3-J5 MBT 150-2.4M (G) (R)
J7
(Default for
M, MG)
J5
(Default)
J4 pins 1-2
(Default)
J7
(Default)
J8
(Default)
J5
(Default)
JUMPER
NOT
INSTALLED
For M and MG units; enables crowbar protection
circuit to trip circuit breaker and shut off unit if
path fault detected.
For MR and MGR units; allows software com-
J7
(Default for
MR, MGR)
J5
J4 pins 2-3
J7
J8 Secondary address allowed.
J5
plete control of path fault protection. Outputs
(voltage and current) are programmed to zero
and relays opened to isolate load in case of path
fault.
Enables crowbar protection circuit to trip circuit
breaker and shut off unit when power loss
detected.
Disables crowbar protection circuit which trips
circuit breaker and shuts off unit when power
loss detected.
For M. MG units: front panel OUTPUT
ENABLED indicator illuminated only when the
output is enabled.
For M. MG units: front panel OUTPUT
ENABLED indicator illuminated whether or not
the output is enabled.
Selects SCPI programming language (see PAR.
3.3.5).
Selects CIIL programming language (see PAR.
3.3.6).
Secondary address not allowed.
Connects shield of external IEEE 488 cable to
signal common.
Disconnects shield of external IEEE 488 cable
from signal common.
DESCRIPTION
2.9 RS 232 CONNECTIONS
Since the MBT uses a 9-pin male connector, it is classified as a Data Terminal Equipment (DTE)
in accordance with the RS 232 Standard (equipment using a female connector is classified as
Data Communication Equipment, DCE).
Either a DTE to DTE or a null modem cable is required to connect the MBT-G to an IBM-PC
compatible computer. This cable has only three wires and connects RXD at one end to TXD at
the other end. The RS232-C port control lines (Table 2-2) are used to activate special feature by
means of jumpers, e.g., secondary addressing may be enabled by putting a jumper between
DSR and RTS at the RS 232 port (pins 6 and 7. Refer to PAR. 3.3.3.1 for RS 232 operation.
NOTE: Be sure the cable used has no unintended internal connections, particularly between
RTS and CTS.
2-12 MBTSVC 111609
FIGURE 2-5. GROUNDED LOAD CONNECTIONS, LOCAL SENSING
FIGURE 2-6. ISOLATED LOAD CONNECTIONS, LOCAL SENSING
MB T SVC 111 60 9 2-13
FIGURE 2-7. GROUNDED LOAD CONNECTIONS, REMOTE SENSING
FIGURE 2-8. ISOLATED LOAD CONNECTIONS, REMOTE SENSING
2-14 MBTSVC 111609
SECTION 1 -
SECTION 2 -
3.1 GENERAL
The MBT Power Supply can be operated in either Local or Remote modes. Upon turn on, the
Power Supply is in Local mode and restores the settings in place at previous turn off. The factory default settings for Voltage and Current are 0, Voltage Mode selected and, for MR and
MGR units, Non-reversed Polarity. MG and MGR (“G” option) units require initialization of the
SBC (single board computer), resulting in an additional initial delay.
Operation of the power supply requires an understanding of how the power supply works. The
MBT power supply is a linear power supply with an automatic crossover between Voltage mode
and Current mode. To avoid confusion, a distinction must be made between actual mode (the
actual mode the power supply operates in) and the commanded mode (the mode the power supply is commanded to enter either by keypad operation (either locally or remotely) or remotely by
a command issued by computer via a controller.
3.1.1 ACTUAL MODE
If the output is enabled, the unit will be in actual Voltage mode as long as the load is greater
than, or equal to, the value of programmed voltage divided by programmed current.
SECTION 3 - OPERATION
V
PROG
VOLTAGE MODE (V
OUT
V
PROG
) when R
≥=
L
--------------------I
PROG
If the output is enabled, the unit will be in actual Current mode as long as the load is less than
the value of programmed voltage divided by programmed current.
V
CURRENT MODE (I
OUTIPROG
) when R
PROG
---------------------<=
L
I
PROG
If the output is disabled, M and MG Models will always be in actual Voltage mode; for MR and
MGR models the actual mode will be the same as the commanded mode.
The STATUS indicators (VOLTAGE MODE and CURRENT MODE) always reflect actual mode.
When the unit operates in actual Voltage mode, the power supply will maintain the output voltage constant at the value programmed for Output Voltage; current will vary in accordance with
the value of the load within the limits established by programmed Current Limit. When the unit
operates in actual Current mode, the power supply will maintain the output current constant at
the value programmed for Output Current; the output voltage will vary in accordance with the
value of the load within the limit established by programmed Voltage Limit.
Note that V
When the unit is in actual Voltage mode, V
Current Limit; when the unit is in actual Current mode, V
PROG
and I
are either output or limit parameters, depending on the actual mode:
PROG
refers to Output Voltage and I
PROG
refers to Voltage Limit and
PROG
PROG
refers to
IPROG refers to Output Current.
MBTSVC111609 3-1
3.1.2 COMMANDED MODE
Two commands are available from the keypad (either locally or remotely) or, in a different form,
from a remote computer: Voltage mode and Current mode. After a Voltage mode command has
been issued, the power supply is considered to be in commanded Voltage mode; after a Current
command, the power supply is in commanded Current mode. These commands can not change
the actual mode. This means, for example, that the power supply can be in commanded Voltage
mode (Voltage mode command issued) and actual Current mode because R
The commanded mode is important during remote operation because it establishes which conditions the internal microcontroller of the power supply will monitor to determine whether an
error condition exists. For commanded Voltage mode the power supply reports a “voltage error”
if the output voltage exceeds the internal limits established for output voltage, and an “overload”
error if the output current reaches the programmed value for Current Limit. For commanded
Current mode the power supply reports a “current error” if the output current exceeds the internal limits established for output current, and an “overload” error if the output voltage reaches the
value programmed for Voltage Limit. Error messages are not used when operating in Local
mode.
When Models MR and MGR are in commanded Voltage mode, the slew keys are assigned to
increase/decrease output voltage, and when the output is disabled (DC OFF pressed), the output relays isolate the output from the load by disconnecting the output. Commanded Current
mode assigns the slew keys to increase/decrease current, and causes the output relays to isolate the output from the load by short-circuiting the output. This feature fully protects the load
regardless of commanded mode. When the output is enabled (DC ON pressed), the output
relays either connect the output to the load (commanded Voltage mode) or remove the short-circuit from the output (commanded Current mode).
< V
L
PROG/IPROG
.
For Models M and MG, commanded mode has virtually no effect on local operation with one
exception: if the unit was commanded to Current mode through remote operation prior to entering Local mode, the slew keys will be assigned to increase/decrease current until the first Voltage mode command is received from the keypad. After receiving a Voltage mode command, the
slew keys will be assigned to increase/decrease voltage. Subsequent Voltage and Current
mode commands have no effect; “No relay present” is displayed and the slew keys remain
allocated to voltage.
3.1.3 LOCAL MODE
In local mode, Voltage and Current can be set either via the front panel keypad or the VOLTAGE
and CURRENT controls (PAR.s 3.2.1.6 and 3.2.1.7). A pair of up/down slew controls provide an
alternate way to control the output incrementally. Selected keys on the keypad serve a dual purpose. These keys are identified by the alternate function labeled in blue; the alternate function is
accessed by pressing the SHIFT key prior to the dual function key.
A local programming feature (PAR. 3.2.1.11) allows the power supply parameters to be preset
and applied for a specified period of time. The Power Supply can be programmed to sequence
through as many as 89 steps which may be divided into a maximum of 10 programs.
A menu feature (PAR. 3.2.2) guides the operator through various operational sequences, including power supply calibration and remote operation of another power supply using the local keypad.
3-2 MBTSVC111609
3.1.4 REMOTE MODE
In Remote Mode the power supply settings are controlled via the IEEE 1118 bus using either a
computer with a Kepco controller or by another MBT unit operating in a remote configuration
with one MBT unit operating as a controller (“G” option enabled) (see PAR. 1.4.2 and Figure 1-
3). MBT Models MG and MGR with the “G” option enabled can also be controlled directly via
either the RS232C or IEEE 488 bus.
PAR. 3.2.2.3 provides instructions for using one MBT keypad to control another MBT power
supply in remote mode. PAR. 3.3 provides instructions for sending remote commands to an
MBT power supply in a computer/controller configuration using SCPI or CIIL programming languages.
3.2 LOCAL MODE OPERATION
3.2.1 LOCAL MODE CONTROLS AND INDICATORS
Local Mode operation is accomplished using the front panel controls, indicators and keypad
described in the following paragraphs.
3.2.1.1 FRONT PANEL CONTROLS AND INDICATORS.
Table 3-1 lists and describes the function of the front panel controls and indicators; see Figure 21 for the location of operating controls and indicators.
TABLE 3-1. FRONT PANEL CONTROLS AND INDICATORS
CONTROL/INDICATOR FUNCTION
POWER circuit breaker
VOLTAGE control
CURRENT control
VOLTAGE MODE
status indicator
CURRENT MODE
status indicator
POLARITY REVERSED
status indicator
REMOTE status indicator Illuminates (green) when power supply is in Remote Mode. 3.2.2.3
OUTPUT ENABLED
status indicator
Alphanumeric Display
Applies source power to the MBT Power Supply and shuts off power supply
upon detection various error conditions.
Used to increase (clockwise rotation) or decrease (counterclockwise) output
voltage (Voltage mode) or voltage limit (Current mode) value.
Used to increase (clockwise rotation) or decrease (counterclockwise) output
current (Current mode) or current limit (Voltage mode) value.
Illuminates (green) when power supply is in Voltage Mode. 3.2.1.8
Illuminates (amber) when power supply is in Current Mode. 3.2.1.8
Illuminates (red) when output polarity is reversed (operational only on MR
and MGR Models).
Illuminates (green) when the power supply output is applied to the load. 3.2.1.5
Displays output voltage and current as well as messages and other information in response to keypad entries.
REFERENCE
PARAGRAPH
3.2.1.2, 4.1.8
3.2.1.6.6,
3.2.1.6.7
3.2.1.7.6 and
3.2.1.7.7
3.2.1.9
3.2.1
ENTRY keypad
MBTSVC111609 3-3
Used to command output mode, adjust output current and voltage, and program power supply.
3.2.1.2
TABLE 3-2. KEY FUNCTIONS
FUNCTION KEY DESCRIPTION
ENTER ENTER
Select alternate
function
Numeric entries 0 - 9, .
CYCLE
PROGRAM
STATUS SHIFT then”.”
Slew voltage or
current
ADD STEP
SHIFT
SHIFT then 0
,
SHIFT then
Used to confirm or enter the input data of the parameter setting. -
Selects alternate function (screened in blue) of keys with dual function capability. SHIFT key press indicated by blinking “
“
sh” disappears if valid key (or SHIFT) pressed. When MBT keypad
is used to control another power supply in a remote configuration, the
“sh” changes to
Numerical keys and “.” are used to input all parameter values. 3.2.1.6, 3.2.1.7
Activated by pressing SHIFT, followed by “0” key when program is
being created or changed. This key function can be pressed at the
end of a local program to indicate that the program is to be recycled
continuously, or to change a program from a “cycle” to “single” run.
Displays programmed voltage, current, OVP (overvoltage protection),
and OCP (overcurrent protection) on alphanumeric display.
Slews the output voltage or current up or down with an increment
which can be set using the menu (see PAR. 3.2.2.6). (Current can be
slewed with these keys only on units commanded to enter Current
mode.) Can also be used to navigate through the screens of each
step of a local program (
Utilized to add steps to program being reviewed, changed, or cre-
ated. Refer to Table 3-16 for default values of new steps.
.
goes up, goes down).
REFERENCE
PARAGRAPH
-
sh” on display;
3.2.1.11.5
-
3.2.1.6.4,
3.2.1.6.5,
3.2.1.11
3.2.1.11.1
DEL (Delete)
STEP
Display/Adjust
Vol tag e
Command
VOLTAGE MODE
Display/Adjust
Current
Command
CURRENT MODE
CLEAR ENTRY CLEAR ENTRY
SHIFT then
Vad j
SHIFT then
Vad j
Iadj
SHIFT then
Iadj
Utilized to delete displayed step from program being reviewed/
changed. After the step has been deleted, the previous step will be
displayed.
Utilized to display or adjust either output voltage (Voltage Mode) or
voltage limit (Current Mode).
MR, MGR Models: If the unit is commanded to operate in Voltage
mode and the output is disabled, the output relays open (output disabled).
M, MG Models: Unavailable function (“
sage displayed).
Utilized to display or adjust current limit (Voltage Mode) or output
current (Current Mode).
MR, MGR Models: If the unit is commanded to operate in Current
mode and the output is disabled, the output relays close, shortcircuiting the output (output disabled).
M, MG Models: Unavailable function (“
sage displayed).
Clears the previous keypad entry and is effective if pressed prior to
the ENTER key being pressed. In addition, this key is used to stop a
running program at a step.
No Relay present” mes-
No Relay present” mes-
3.2.1.11.4
3.2.1.6.1,
3.2.1.6.2,
3.2.1.6.3,
3.2.1.8
3.2.1.7.1,
3.2.1.7.2,
3.2.1.7.3
3.2.1.8
3.2.1.11.6
3.2.1.11.7
3-4 MBTSVC111609
TABLE 3-2. KEY FUNCTIONS (CONTINUED)
FUNCTION KEY DESCRIPTION
Places power supply in Local Mode (front panel control) if the unit is
Command
LOCAL mode
RESET RESET
EXECUTE
PROGRAM
Enable Output DC ON
Disable Output DC OFF
SHIFT then
CLEAR ENTRY
SHIFT then
RESET
being operated remotely, otherwise this function is not operational. In
Remote Lock mode (power supply controlled remotely), all Local
Mode functions, including Local Mode selection are inhibited (see
PAR. 3.2.2.2.
M, MG Models: Programs output voltage and current to 0. In addition, this key is used to stop a local program in progress.
MR, MGR Models: In addition to above functions, sets the unit to
Voltage Mode and Positive polarity and isolate the power supply from
the load.
Runs the program selected with the REV/CHG PROGRAM function. 3.2.1.11.3
MR, MGR Models: Enables d-c output power, connecting the unit to
the load.
M, MG Models: Enables output values to be applied to the load.
MR, MGR Models: Disables d-c output power, disconnecting the unit
from the load.
M, MG Models: Programs output voltage and current to zero; the unit
will still display the previous output settings
REFERENCE
PARAGRAPH
3.2.1.11.2
3.2.1.11.6
3.2.1.11.7
3.2.1.5
3.2.1.5
CHANGE
POLARITY
Enter MENU
mode
REV/CHG.
(Review/Change)
PROGRAM
Set time duration
of program steps
GPIB ADDRESS
NEXT NEXT
PREVIOUS
SHIFT then DC
OFF
MENU ON/OFF
SHIFT then
MENU ON/OFF
DELAY (SEC)
SHIFT then
DELAY (SEC)
SHIFT then
NEXT
MR, MGR Models: Reverses output polarity.
M, MG Models: Unavailable function (“
sage displayed).
Toggles the MENU on and off. 3.2.2
Displays program on alphanumeric display (see NEXT and PREVIOUS, below). Used to review/change existing programs or enter new
programs into memory.
Utilized to program the time duration for each step of a program
entered via the keypad. Values are in seconds - 0.1 minimum to 9999
maximum (4 digits + decimal point allowed).
Displays unit’s GPIB address on alphanumeric display and allows
change of unit’s GPIB address via keypad entry.
Allows next step of program or new menu item to be displayed. Operates only when REV/CHG PROGRAM or MENU function selected.
Allows previous step of program to be displayed. Operates only when
REV/CHG PROGRAM or MENU functions selected.
No Relay present” mes-
3.2.1.9
3.2.1.11.1
3.2.1.11
3.2.1.10
3.2.1.11.2
-
MBTSVC111609 3-5
3.2.1.2 KEYPAD OPERATION
In Local mode, all parameter settings and operations are via a 24-key front panel keypad and
two controls. Alternate key functions, screened in blue on the keypad, are represented in italics
in the listing below. These alternate key functions require that the SHIFT key be pressed prior to
depressing the alternate function key. Valid key entries will be indicated with a quarter-second
beep; in most cases invalid entries will be indicated with a half-second (louder) beep. Table 3-2
lists the functions of the keys on the front panel keypad.LOCAL MODE PROCEDURES
3.2.1.3 TURNING THE POWER SUPPLY ON
CAUTION: DO NOT repeatedly toggle the circuit breaker/switch as this may cause unit to
fault.
1. Set Power ON/OFF circuit breaker/switch on front panel to ON. If actuator does not lock
when released, wait a few seconds before trying again. The circuit breaker is "trip-free"
design; if overload exists or the protection is activated, contacts cannot be held closed by
actuator.
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
KEPCO, INC.
MBT 100-3.6MGR
2. After approximately 2 seconds, the display changes to:
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
Output is OFF
***V ***A
3. The unit is now in Local mode.
3.2.1.4 SETTING LOCAL MODE
If the unit is being operated remotely (REMOTE indicator is on.), use the following procedure to
set the unit into LOCAL mode
REMOTE OUTPUT
REMOTE OUTPUT
ENABLED
ENABLED
NOTE: ***V and ***A are the output volt-
age and current settings in effect
at time of last operation (for first
time use, the voltage and current
are set to 0).
NOTE: In Remote Lock mode, all Local Mode functions, including Local Mode selection, are
inhibited. To enter Local mode it will be necessary turn MBT power off for approximately 10 seconds, then on.
1. Press SHIFT (blinking “sh” appears on alphanumeric display). Depending on the model,
and whether the output is enabled or disabled, one of the following displays (A-D) will
appear:
3-6 MBTSVC111609
NOTES: A blinking “:” is represented by “ ” to indicate that the values displayed on the bottom line
of the alphanumeric display are “live,” i.e., actual values at the power supply output.
A blinking “sh” is represented by
and the next key that is pressed will be interpreted with the alternate meaning.
indicates STATUS LED may be on or off, depending on the actual status of the
power supply.
*** indicates the values displayed are actual values for output voltage and current.
### indicates that the values displayed for voltage and current are the actual internal
values prior to passing through the output relays. For commanded voltage mode the
display will show the programmed value for output voltage and 0 A for current. For
commanded current mode the display will show 0 V for voltage and the programmed
value for output current.
A
M, MG models with
Output Enabled
sh to indicate that the SHIFT key has been pressed,
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Remote control
***V ***A sh
ENABLED
B
M, MG models with
Output disabled
C
MR, MGR models with
Output enabled
D
MR, MGR models with
Output disabled
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Remote control
0 V 0 A sh
VOLTAGE
MODE
CURRENT
MODE
STATUS
POLARITY
REVERSED
REMOTE OUTPUT
Remote control
***V ***A sh
VOLTAGE
MODE
CURRENT
MODE
STATUS
POLARITY
REVERSED
REMOTE OUTPUT
Remote control
###V ###A sh
ENABLED
ENABLED
ENABLED
MBTSVC111609 3-7
2. Press CLEAR ENTRY (LOCAL). Depending on the model, and whether the output is
enabled or disabled, one of the following displays (A-D) will appear:
NOTE: For explanation of symbols, see step 1 above.
A
M, MG models with
Output Enabled
B
M, MG models with
Output disabled
C
MR, MGR models with
Output enabled
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Keypad control
***V ***A
VOLTAGE
MODE
CURRENT
MODE
STATUS
POLARITY
REVERSED
REMOTE OUTPUT
Keypad control
0 V 0 A
VOLTAGE
MODE
CURRENT
MODE
STATUS
POLARITY
REVERSED
REMOTE OUTPUT
Keypad control
***V ***A
ENABLED
ENABLED
ENABLED
D
STATUS
MR, MGR models with
VOLTAGE
Output disabled
3-8 MBTSVC111609
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Output is OFF
###V ###A
ENABLED
3.2.1.5 ENABLING/DISABLING DC OUTPUT POWER
3.2.1.5.1 M AND MG MODELS
The DC OFF key will change the output voltage and current values to zero. The DC ON key
restores the previous output voltage and current values if these settings were not changed via
the keypad and/or VOLTAGE/CURRENT controls.
1. With the output disabled, the display reads:
STATUS
NOTE: This screen indicates the power sup-
ply is in local mode with output dis-
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
abled and is waiting for some
instruction (e.g., setting output volt-
Output is OFF
***V ***A
age, current, running or changing a
program, etc.).
*** Represents programmed values.
2. To enable the output, press DC ON; the display briefly changes to:
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Output ON
nnnV nnnA
ENABLED
NOTE: nnnV and nnnA represent the
actual output voltage and current of
the power supply.
then the display reads:
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Keypad control
nnnV nnnA
ENABLED
NOTE: This screen indicates the power
supply is in local mode with output
enabled and is waiting for some
instruction (e.g., setting output voltage, current, running or changing a
program, etc.).
If the value of the load is less than the programmed voltage divided by the programmed current
(R
< V
L
Prog
/ I
), the MBT power supply will be forced into Current mode and the VOLTAGE
Prog
MODE indicator will be off and the CURRENT MODE indicator will be on.
Pressing the DC OFF key causes the actual output voltage and current to go to zero; the display
shows the programmed values for voltage and current.
MBTSVC111609 3-9
3.2.1.5.2 MR AND MGR MODELS
If the unit is in commanded Voltage mode, the DC OFF key electrically disconnects the output
from the load; if the unit is in commanded Current mode, the DC OFF key short circuits the output. The DC ON key restores the previous status if these settings were not changed by the keypad and/or VOLTAGE/CURRENT controls.
1. With the output disabled, the display reads:
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
Output is OFF
***V ***A
REMOTE OUTPUT
ENABLED
NOTE: This screen indicates the power
supply is in local mode with output
disabled and is waiting for some
instruction (e.g., setting output voltage, current, mode. running/changing a program, etc.).
*** Represents programmed values.
Status LEDs show the commanded
mode (Voltage or Current).
*** Represents programmed values.
2. To enable the output, press DC ON; the display briefly changes to:
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Relay closed
nnnV nnnA
ENABLED
NOTE: nnnV and nnnA represent the
actual output voltage and current of
the power supply.
then the display reads:
VOLTAGE
MODE
CURRENT
MODE
STATUS
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
NOTE: This screen indicates the power
supply is in local mode with output
enabled and is waiting for some
instruction (e.g., setting output volt-
Keypad control
nnnV nnnA
age, current, mode. running/changing a program, etc.).
Status LEDs now show the actual
mode (Voltage or Current).
If the value of the load is less than the programmed voltage divided by the programmed current
(R
< V
L
Prog
/ I
), the MBT power supply will be forced into Current mode and the VOLTAGE
Prog
MODE indicator will go off and the CURRENT MODE indicator will go on.
Pressing the DC OFF key causes the relays to disconnect the load from the power supply output; the display shows the programmed values for voltage and current.
3-10 MBTSVC111609
3.2.1.6 SETTING OUTPUT VOLTAGE OR VOLTAGE LIMIT
There are three ways to set output voltage or voltage limit: 1) Vadj and numeric keys, 2) slew
keys, and 3) the VOLTAGE control. The display should be reading either “Output is off” if
the output is disabled, or “Keypad control” if the output is enabled.
3.2.1.6.1 USING VADJ AND NUMERIC KEYS — M, MG MODELS
The Vadj and numeric keys can be used to adjust either output voltage or voltage limit (either
the actual value or the programmed value). The effect of the numeric keypad entries is dependent upon the model, the previously commanded mode, whether the output is enabled or disabled, and the load value.
For M and MG models, when the output is disabled, the output voltage and current are programmed to zero, and the power supply remains in actual voltage mode. If the output is
enabled, the power supply will operate in voltage mode except for the case where the value of
the load is less than the programmed voltage divided by the programmed current (R
I
). In this case the MBT power supply will be forced into Current mode.
Prog
Table 3-3 summarizes the effect of the Vadj adjustment. The first three columns reflect the status of the unit before the Vadj command is issued. The fourth column shows the message on
the front panel display after the Vadj is pressed and the fifth column shows how the adjustment
will affect the status of the power supply. Refer to PAR.s 3.1.1 and 3.1.2 for more details regarding commanded and actual mode of operation (either voltage or current).
< V
L
Prog
/
If the output is enabled and the value of the load is greater than or equal to the value of programmed voltage divided by programmed current (R
≥ V
L
Prog
/ I
), the power supply oper-
Prog
ates in voltage mode and the keypad entries adjust actual output voltage, contrary to the display
indication.
If the output is enabled and the value of the load is less than the value of programmed voltage
divided by programmed current (R
L
< V
Prog
/ I
), the power supply is forced to operate in cur-
Prog
rent mode and the keypad entries adjust actual voltage limit.
If the power supply was operating in a remote configuration, setting output voltage or voltage
limit can also be influenced by the last command issued to the power supply before the unit is
put into Local Mode. If the power supply was commanded to operate in Current mode before
being set into Local mode, Table 3-3 indicates that if the load allows the power supply to operate
in voltage mode, Vadj and the keypad entries adjust either actual output voltage or programmed
voltage limit, depending on whether the load is enabled or disabled. If the load forces the power
supply to operate in current mode, Vadj and keypad entries will adjust actual voltage limit, contrary to the display indication.
Refer to PAR. 3.2.1.6.3 for procedure.
MBTSVC111609 3-11
TABLE 3-3. USING VADJ AND KEYPAD ENTRIES TO SET
OUTPUT VOLTAGE/VOLTAGE LIMIT — MODELS M, MG
POWER SUPPLY STATUS BEFORE Vadj PRESSED EFFECT AFTER Vadj PRESSED
COMMANDED
MODE
VOLTAGE DISABLED VOLTAGE***** CONST VOLT = Programmed output voltage
VOLTAGE ENABLED VOLTAGE CONST VOLT = Actual output voltage
VOLTAGE ENABLED CURRENT**** CONST VOLT = Actual Voltage limit **
CURRENT * DISABLED VOLTAGE***** VOLT LIMIT = Programmed voltage limit
CURRENT * ENABLED CURRENT VOLT LIMIT = Actual Voltage limit
CURRENT * ENABLED VOLTAGE**** VOLT LIMIT = Actual output voltage **
* If the unit was programmed to Current mode remotely before being set to Local Mode, the unit will stay in com-
manded current mode until a Voltage Mode command is received.
** “Overload” error message placed in error buffer (for use when operating in Remote mode).
*** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
**** Condition where load forces power supply mode.
***** Forced internally by the power supply.
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE ***
(DICTATED BY
LOAD)
DISPLAY
INDICATION
NUMERIC VALUE
SET BY KEYPAD
ADJUSTS:
3.2.1.6.2 USING VADJ AND NUMERIC KEYS — MR, MGR MODELS
The Vadj and numeric keys can be used to adjust either output voltage or voltage limit (either
the actual value or the programmed value). The effect of the numeric keypad entries is dependent upon the model, the previously commanded mode, whether the output is enabled or disabled, and the load value.
For MR and MGR models, when the output is disabled, the load is disconnected from the power
supply if the power supply is operating in Voltage mode, or the power supply output is short
circuited if the unit is operating in Current mode.
If the output is enabled, the power supply can operate either in voltage mode or current mode,
as determined by both the programmed output values (Voltage or Current) and the value of the
load. If the power supply is commanded to be in Voltage mode, the power supply will actually
operate in voltage mode when R
I
. Similarly if the power supply is commanded to be in Current mode, the power supply will
Prog
actually operate in Current mode when R
R
≥ V
L
Prog/ Prog
.
≥ V
L
Prog
/ I
, and current mode (forced) when RL < V
Prog
< V
L
Prog
/ I
, and in Voltage mode (forced) when
Prog
Prog
Table 3-4 summarizes the effect of the Vadj adjustment. The first three columns reflect the sta-
tus of the unit before the Vadj command is issued. The fourth column shows the message on
the front panel display after the Vadj key is pressed and the fifth column shows how the adjustment will affect the status of the power supply. Refer to PAR.s 3.1.1 and 3.1.2 for more details
regarding commanded and actual mode of operation (either voltage or current).
3-12 MBTSVC111609
/
If the output is enabled, and the power supply is commanded to operate in Voltage mode, but
R
L<VProg
/ I
forces the power supply to operate in current mode, the keypad entries adjust
Prog
the actual voltage limit, contrary to the display indication.
If the output is enabled, and the power supply is commanded to operate in Current mode, but
R
≥ V
L
Prog
/ I
forces the power supply to operate in Voltage mode, the keypad entries adjust
Prog
the actual output voltage, contrary to the display indication.
Refer to PAR. 3.2.1.6.3 for procedure.
TABLE 3-4. USING VADJ AND KEYPAD ENTRIES TO SET
OUTPUT VOLTAGE/VOLTAGE LIMIT — MODELS MR, MGR
POWER SUPPLY STATUS BEFORE Vadj PRESSED EFFECT AFTER Vadj PRESSED
COMMANDED
MODE
VOLTAGE DISABLED VOLTAGE**** CONST VOLT = Programmed output voltage
CURRENT DISABLED CURRENT**** VOLT LIMIT = Programmed voltage limit
VOLTAGE ENABLED VOLTAGE CONST VOLT = Actual output voltage
VOLTAGE ENABLED CURRENT * CONST VOLT = Actual voltage limit **
CURRENT ENABLED CURRENT VOLT LIMIT = Actual voltage limit
CURRENT ENABLED VOLTAGE * VOLT LIMIT = Actual output voltage **
* Condition where load forces power supply mode.
** “Overload” error message placed in error buffer (for use when operating in Remote mode).
*** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
**** Forced internally by the power supply.
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE ***
(DICTATED BY
LOAD)
DISPLAY
INDICATION
NUMERIC VALUE
SET BY KEYPAD
ADJUSTS:
3.2.1.6.3 PROCEDURE USING VADJ AND NUMERIC KEYPAD
1. Press Vadj.
VOLTAGE
MODE
CURRENT
MODE
STATUS
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
or
VOLTAGE
MODE
CURRENT
MODE
STATUS
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
Const Volt =
###V ###A
Volt limit =
###V ###A
NOTES: indicates LED may be either on or off.
###V and ###A will either be actual or programmed values of output voltage/voltage
limit and output current/current limit (see Tables 3-3 and 3-4).
indicates that blinking “:” appears only for OUTPUT ENABLED status.
MBTSVC111609 3-13
2. Enter voltage value via key pad, e.g., 25.6.
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
Const Volt = 25.6
###V ###A
3. Press ENTER to confirm or CLEAR ENTRY to correct. Display will return to “Output is
OFF” or “Keypad control” display with either the new setting (ENTER) or the old setting
(CLEAR ENTRY). If the entered value is too high, the display will indicate “Value too
high,” then return to either “Output is OFF” or “Keypad control” display, showing
the previous value.
NOTE: The display time for momentary messages, such as “Value too high,” can be
reduced by pressing any key until the message concludes; the ENTER key is convenient for this purpose.
3.2.1.6.4 SLEW ( AND ) KEYS — M, MG MODELS
As described in PAR. 3.2.1.6.1 (M, MG Models) for the Vadj and numeric keys, the effect of the
slew keys is dependent upon model, commanded mode, output enabled/disabled, actual mode,
and the load.
or
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Volt limit = 25.6
###V ###A
ENABLED
Table 3-5 summarizes the effect of the slew key adjustment. The first three columns reflect the
status of the unit before the slew key is pressed. The fourth column shows how the adjustment
will affect the status of the power supply. Refer to PAR.s 3.1.1 and 3.1.2 for more details regarding commanded and actual mode of operation (either voltage or current).
The slew keys are not operational when the power supply is in Remote mode, when you enter
the MENU (PAR. 3.2.2), or PROGRAM REV/CHG (PAR. 3.2.1.11.1) functions, or when a program is running (PAR.s 3.2.1.11.3 and 3.2.1.11.5).
Table 3-5 shows that with the power supply commanded to operate in voltage mode, with the
output disabled, the slew keys adjust the programmed output voltage.
If the output is enabled and the value of the load is greater than or equal to the value of programmed voltage divided by programmed current (R
L
≥ V
Prog
/ I
), the power supply operates
Prog
in Voltage mode and the slew keys adjust actual output voltage.
If the output is enabled and the value of the load is less than the value of programmed voltage
divided by programmed current (R
L
< V
Prog
/ I
), the power supply will be forced to operate in
Prog
Current mode and the slew keys will adjust actual voltage limit. This will not be apparent from
the display indication; to see the revised voltage limit it is necessary to view status by pressing
SHIFT then (.) on the keypad.
3-14 MBTSVC111609
.
TABLE 3-5. USING SLEW KEYS ( AND ) TO SET OUTPUT
VOLTAGE/VOLTAGE LIMIT — MODELS M, MG
POWER SUPPLY STATUS BEFORE SLEW KEY PRESSED
SLEW KEYS
COMMANDED
MODE
VOLTAGE DISABLED VOLTAGE***** Programmed output voltage
VOLTAGE ENABLED VOLTAGE Actual output voltage
VOLTAGE ENABLED CURRENT**** Actual Voltage limit **
OUTPUT ENABLED/
DISABLED
ACTUAL MODE ***
(DICTATED BY LOAD)
ADJUST:
CURRENT * Either DISABLED
or ENABLED
* If the unit was programmed to Current mode remotely before being set to Local Mode, the unit will stay in com-
manded current mode until a Voltage Mode command is received.
** Overload” error message placed in error buffer (for use when operating in Remote mode).
*** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
**** Condition where load forces power supply mode.
***** Forced internally by power supply.
Either VOLTAGE
or CURRENT
No effect on voltage. (Refer to table
3-9 for effect on current/current limit.)
If the power supply was operating in a remote configuration, and the slew keys will be used to
locally adjust voltage/voltage limit, it is advisable to press SHIFT and Vadj to ensure that the
power supply has been commanded to operate in Voltage mode. If the power supply was commanded to operate in current mode before being set into Local mode, the slew keys will have no
effect on output voltage or voltage limit.
Pressing the key increases the output voltage/voltage limit (see Table 3-5) by the slew key V
range value which was previously set using the MENU (see PAR. 3.2.2). For example, if the output voltage is 25.6V (Voltage mode, output enabled), and the slew key V range value is 0.10V,
pressing the key twice changes the output voltage to 25.8V. The key operates similarly to
decrease output voltage by the slew key V range value.
3.2.1.6.5 SLEW ( AND ) KEYS — MR, MGR MODELS
As described in PAR. 3.2.1.6.2 (MR, MGR Models) for the Vadj and numeric keys, the effect of
the slew keys is dependent upon model, commanded mode, output enabled/disabled, actual
mode, and the load.
Table 3-6 (MR, MGR Models) summarizes the effect of the slew key adjustments for different
conditions. The first three columns reflect the status of the unit before the slew key is pressed.
The fourth column shows how the adjustment will affect the status of the power supply. Refer to
PAR.s 3.1.1 and 3.1.2 for more details regarding commanded and actual mode of operation
(either voltage or current).
MBTSVC111609 3-15
TABLE 3-6. USING SLEW KEYS ( AND ) TO SET OUTPUT
VOLTAGE/VOLTAGE LIMIT — MODELS MR, MGR
POWER SUPPLY STATUS BEFORE SLEW KEY PRESSED
COMMANDED
MODE
VOLTAGE DISABLED VOLTAGE**** Programmed output voltage
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE **
(DICTATED BY LOAD)
SLEW KEYS
ADJUST:
CURRENT Either DISABLED
or ENABLED
VOLTAGE ENABLED VOLTAGE Actual output voltage
VOLTAGE ENABLED CURRENT*** Actual voltage limit *
* “Overload” error message placed in error buffer (for use when operating in Remote mode).
** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
*** Condition where load forces power supply mode.
**** Forced internally by power supply.
Either CURRENT or VOLTAGE
No effect on voltage. (Refer to table
3-11 for effect on current/current
limit.)
The slew keys are not operational when the power supply is in Remote mode, when you enter
the MENU (PAR. 3.2.2), or PROGRAM REV/CHG (PAR. 3.2.1.11.1) functions, or when a program is running (PAR.s 3.2.1.11.3 and 3.2.1.11.5).
Table 3-6 shows that with the power supply commanded to operate in Voltage mode, with the
output disabled, the slew keys adjust the programmed output voltage.
If the output is enabled and the value of the load is greater than or equal to the value of programmed voltage divided by programmed current (R
L
≥ V
Prog
/ I
), the power supply operates
Prog
in Voltage mode and the slew keys adjust actual output voltage.
If the output is enabled and the value of the load is less than the value of programmed voltage
divided by programmed current (R
< V
L
Prog
/ I
), the power supply will be forced to operate in
Prog
Current mode and the slew keys will adjust actual voltage limit. This will not be apparent from
the display indication; to see the revised voltage limit it is necessary to view status by pressing
SHIFT then (.) on the keypad.
If the power supply was operating in a remote configuration, and the slew keys will be used to
locally adjust voltage/voltage limit, it is advisable to press SHIFT and Vadj to ensure that the
power supply has been commanded to operate in Voltage mode. If the power supply was commanded to operate in current mode before being set into Local mode, the slew keys will have no
effect on output voltage or voltage limit.
Pressing the key increases the output voltage/voltage limit (see Table 3-6) by the slew key V
range value which was previously set using the MENU (see PAR. 3.2.2). For example, if the output voltage is 25.6V (Voltage mode, output enabled), and the slew key V range value is 0.10V,
pressing the key twice changes the output voltage to 25.8V. The key operates similarly to
decrease output voltage by the slew key V range value.
3-16 MBTSVC111609
3.2.1.6.6 VOLTAGE CONTROL — M, MG MODELS
As described in PAR. 3.2.1.6.1 (M, MG Models) for the Vadj and numeric keys, the effect of the
VOLTAGE control is dependent upon model, commanded mode, output enabled/disabled,
actual mode, and the load.
Table 3-7 (M, MG Models) summarizes the effect of the VOLTAGE control adjustments for dif-
ferent conditions. The first three columns reflect the status of the unit before the VOLTAGE con-
trol is adjusted. The fourth column shows how the adjustment will affect the status of the power
supply. Refer to PAR.s 3.1.1 and 3.1.2 for more details regarding commanded and actual mode of
operation (either voltage or current).
TABLE 3-7. USING VOLTAGE CONTROL TO SET OUTPUT
VOLTAGE/VOLTAGE LIMIT — MODELS M, MG
POWER SUPPLY STATUS BEFORE VOLTAGE CONTROL ADJUSTED
COMMANDED
MODE
VOLTAGE DISABLED VOLTAGE***** Programmed output voltage
VOLTAGE ENABLED VOLTAGE Actual output voltage
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE ***
(DICTATED BY LOAD)
VOLTAGE CONTROL
ADJUSTS:
VOLTAGE ENABLED CURRENT**** Actual voltage limit **
CURRENT * DISABLED Either VOLTAGE
or CURRENT
CURRENT * ENABLED CURRENT Actual voltage limit
CURRENT * ENABLED VOLTAGE Actual output voltage
* If the unit was programmed to Current mode remotely before being set to Local Mode, the unit will stay in com-
manded current mode until a Voltage Mode command is received.
** Overload” error message placed in error buffer (for use when operating in Remote mode).
*** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
**** Condition where load forces power supply mode.
***** Forced internally by the power supply.
Programmed voltage limit
The VOLTAGE control is not operational when the power supply is in Remote mode or when
you enter the MENU (PAR. 3.2.2), PROGRAM REV/CHG (PAR. 3.2.1.11.1) functions, or when a
program is running (PAR.s 3.2.1.11.3 and 3.2.1.11.5).
Rotating the VOLTAGE control clockwise increases output voltage/voltage limit; counterclock-
wise decreases output voltage/voltage limit.
Table 3-7 shows that with the power supply commanded to be in Voltage mode and the load disabled, the VOLTAGE control adjusts the programmed output voltage.
If the output is enabled and the value of the load is greater than or equal to the value of programmed voltage divided by programmed current (R
≥ V
L
Prog
/ I
), the power supply operates
Prog
in Voltage mode and the VOLTAGE control adjusts actual output voltage.
If the output is enabled and the value of the load is less than the value of programmed voltage
divided by programmed current (R
MBTSVC111609 3-17
< V
L
Prog
/ I
), the power supply will be forced to operate in
Prog
Current mode and the VOLTAGE control will adjust actual voltage limit. This will not be apparent
from the display indication; to see the revised voltage limit it is necessary to view status by
pressing SHIFT then (.) on the keypad.
3.2.1.6.7 VOLTAGE CONTROL — MR, MGR MODELS
As described in PAR. 3.2.1.6.2 (MR, MGR Models) for the Vadj and numeric keys, the effect of
the VOLTAGE control is dependent upon model, commanded mode, output enabled/disabled,
actual mode, and the load.
Table 3-8 (MR, MGR Models) summarizes the effect of the VOLTAGE control adjustments for
different conditions. The first three columns reflect the status of the unit before the VOLTAGE
control is adjusted. The fourth column shows how the adjustment will affect the status of the
power supply. Refer to PAR.s 3.1.1 and 3.1.2 for more details regarding commanded and actual
mode of operation (either voltage or current).
TABLE 3-8. USING VOLTAGE CONTROL TO SET OUTPUT
VOLTAGE/VOLTAGE LIMIT — MODELS MR, MGR
POWER SUPPLY STATUS BEFORE VOLTAGE CONTROL ADJUSTED
COMMANDED
MODE
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE **
(DICTATED BY LOAD)
VOLTAGE CONTROL
ADJUSTS:
VOLTAGE DISABLED VOLTAGE**** Programmed output voltage
CURRENT DISABLED CURRENT**** Programmed voltage limit
VOLTAGE ENABLED VOLTAGE Actual output voltage
VOLTAGE ENABLED CURRENT *** Actual Voltage limit *
CURRENT ENABLED CURRENT Actual Voltage limit
CURRENT ENABLED VOLTAGE Actual output voltage
* Overload” error message placed in error buffer (for use when operating in Remote mode).
** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
*** Condition where load forces power supply mode.
**** Forced internally by the power supply
The VOLTAGE control is not operational when the power supply is in Remote mode or when
you enter the MENU (PAR. 3.2.2), PROGRAM REV/CHG (PAR. 3.2.1.11.1) functions, or when a
program is running (PAR.s 3.2.1.11.3 and 3.2.1.11.5).
Rotating the VOLTAGE control clockwise increases output voltage/voltage limit; counterclock-
wise decreases output voltage/voltage limit.
Table 3-8 shows that if the output is disabled, with the power supply commanded to be in Voltage mode the VOLTAGE control adjusts the programmed output voltage, with the power supply
commanded to be in Current mode the VO LTA G E control adjusts programmed voltage limit.
If the output is enabled and the value of the load is greater than or equal to the value of programmed voltage divided by programmed current (R
L
≥ V
Prog
/ I
), the power supply operates
Prog
in Voltage mode and the VOLTAGE control adjusts actual output voltage.
3-18 MBTSVC111609
If the output is enabled and the value of the load is less than the value of programmed voltage
divided by programmed current (R
< V
L
Prog
/ I
), the power supply operates in Current mode
Prog
and the VOLTAGE control adjusts actual voltage limit. This will not be apparent from the display
indication; to see the revised voltage limit it is necessary to view status by pressing SHIFT then
(.) on the keypad.
3.2.1.7 SETTING OUTPUT CURRENT OR CURRENT LIMIT
There are three ways to set output current or current limit: 1) Iadj and numeric keys, 2) slew
keys, 3) the CURRENT control. The display should be reading either “Output is off” (PAR.
3.2.1.5.2, step 1) if the output is disabled, or “Keypad control” (PAR. 3.2.1.5.1, step 2) if the
output is enabled.
NOTE: If the power supply is operating in a remote configuration, the operation of Local con-
trols can be influenced by the last mode command sent via remote mode before the
unit was set to Local mode. For this reason it is advisable to set the power supply
mode locally using SHIFT then Vadj (commanded Voltage mode) or SHIFT then Iadj
(commanded Current mode) before setting current/current limit values
3.2.1.7.1 USING IADJ AND NUMERIC KEYS — M, MG MODELS
The Iadj and numeric keys can be used to adjust either output current or current limit (either the
actual value or the programmed value). The effect of the numeric keypad entries is dependent
upon the model, commanded mode, whether the output is enabled or disabled, and the load.
For M and MG models, when the output is disabled, the load is disconnected from the power
supply. If the load is enabled, the power supply will operate in voltage mode except for the case
where the value of the load is less than the programmed voltage divided by the programmed
current (R
< V
L
Prog
/ I
). In this case the MBT power supply will be forced into Current mode.
Prog
Table 3-9 (M, MG Models) summarizes the effect of the Iadj and numeric keys for different conditions. The first three columns reflect the status of the unit before the Iadj command is issued.
The fourth column shows the message on the front panel display after the Iadj key is pressed
and the fifth column shows how the adjustment will affect the status of the power supply. Refer
to PAR.s 3.1.1 and 3.1.2 for more details regarding commanded and actual mode of operation
(either voltage or current).
Table 3-9 shows that with the power supply operating in Voltage mode, with the output disabled,
Iadj and keypad entries adjust the programmed current limit.
If the load is enabled and the value of the load is greater than or equal to the value of programmed voltage divided by programmed current (R
≥ V
L
Prog
/ I
), the power supply operates
Prog
in Voltage mode and the Iadj and keypad entries adjust actual current limit.
If the load is enabled and the value of the load is less than the value of programmed voltage
divided by programmed current (R
< V
L
Prog
/ I
), the power supply is forced to operate in cur-
Prog
rent mode and the Iadj and keypad entries adjust actual output current.
MBTSVC111609 3-19
TABLE 3-9. USING IADJ AND KEYPAD ENTRIES TO SET OUTPUT
CURRENT/CURRENT LIMIT — MODELS M, MG
POWER SUPPLY STATUS BEFORE Iadj PRESSED EFFECT AFTER Iadj PRESSED
COMMANDED
MODE
CURRENT * DISABLED CURRENT CONST CURR = Programmed output current
CURRENT * ENABLED CURRENT CONST CURR = Actual output current
CURRENT * ENABLED VOLTAGE **** CONST CURR = Actual current limit **
VOLTAGE DISABLED VOLTAGE CURR LIMIT = Programmed current limit
VOLTAGE ENABLED VOLTAGE CURR LIMIT = Actual current limit
VOLTAGE ENABLED CURRENT **** CURR LIMIT = Actual output current **
* If the unit was programmed to Current mode remotely before being set to Local Mode, the unit will stay in current
mode until a Voltage Mode command is received.
** “Overload” error message placed in error buffer (for use when operating in Remote mode).
*** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
**** Condition where load forces power supply mode.
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE ***
(DICTATED BY
LOAD)
DISPLAY
INDICATION
NUMERIC VALUE
SET BY KEYPAD
ADJUSTS:
If the power supply is operating in a remote configuration, setting output current or current limit
can also be influenced by the last command issued to the power supply before the unit is put
into Local Mode. If the power supply was commanded to operate in Current mode before being
set into Local mode, Table 3-9 indicates that if the load allows the power supply to operate in
current mode, Iadj and the keypad entries adjust either programmed or actual output current
depending on whether the load is disabled or enabled. If the load forces the power supply to
operate in voltage mode, Iadj and keypad entries will adjust actual current limit, contrary to the
display indication.
Refer to PAR. 3.2.1.7.3 for procedure.
3.2.1.7.2 USING IADJ AND NUMERIC KEYS — MR, MGR MODELS
The Iadj and numeric keys can be used to adjust either output current or current limit (either the
actual value or the programmed value). The effect of the numeric keypad entries is dependent
upon the model, commanded mode, whether the output is enabled or disabled, and the load.
For MR and MGR models, when the output is disabled, the load is disconnected from the power
supply if the power supply is operating in Voltage mode, or the power supply output is short
circuited if the unit is operating in Current mode.
If the output is enabled, the power supply can operate either in voltage mode or current mode,
as determined by both the programmed output values (Voltage or Current) and the value of the
load. If the power supply is commanded to be in Voltage mode, the power supply will actually
operate in voltage mode when R
I
. Similarly if the power supply is commanded to be in Current mode, the power supply will
Prog
actually operate in Current mode when R
R
≥ V
L
Prog/ Prog
.
≥ V
L
Prog
/ I
, and current mode (forced) when RL < V
Prog
< V
L
Prog
/ I
, and in Voltage mode (forced) when
Prog
Prog
3-20 MBTSVC111609
/
Table 3-10 (MR, MGR Models) summarizes the effect of the Iadj and numeric keys for different
conditions. The first three columns reflect the status of the unit before the Iadj command is
issued. The fourth column shows the message on the front panel display after the Iadj key is
pressed and the fifth column shows how the adjustment will affect the status of the power supply. Refer to PAR.s 3.1.1 and 3.1.2 for more details regarding commanded and actual mode of
operation (either voltage or current).
Table 3-10 shows that with the power supply output disabled, the Iadj and keypad entries adjust
the programmed output current (Current mode) or current limit (Voltage mode). The Iadj and
keypad entries operate similarly to control actual output current/current limit if the power supply
output is enabled, and the value of the load permits the power supply to operate in the commanded mode, Current/Voltage.
TABLE 3-10. USING IADJ AND KEYPAD ENTRIES TO SET
OUTPUT CURRENT/CURRENT LIMIT — MODELS MR, MGR
POWER SUPPLY STATUS BEFORE Iadj PRESSED EFFECT AFTER Iadj PRESSED
COMMANDED
MODE
CURRENT DISABLED CURRENT***** CONST CURR = Programmed output current
VOLTAGE DISABLED VOLTAGE***** CURR LIMIT = Programmed current limit
CURRENT ENABLED CURRENT CONST CURR = Actual output current
CURRENT ENABLED VOLTAGE **** CONST CURR = Actual current limit **
VOLTAGE ENABLED VOLTAGE CURR LIMIT = Actual current limit
VOLTAGE ENABLED CURRENT **** CURR LIMIT = Actual output current **
* If the unit was programmed to Current mode remotely before being set to Local Mode, the unit will stay in current
mode until a Voltage Mode command is received.
** “Overload” error message placed in error buffer (for use when operating in Remote mode).
*** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
**** Condition where load forces power supply mode
***** Forced by the power supply.
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE ***
(DICTATED BY
LOAD)
DISPLAY
INDICATION
NUMERIC VALUE
SET BY KEYPAD
ADJUSTS:
If the load is enabled, and the power supply is commanded to operate in Current mode, but
R
≥ V
L
Prog
/ I
forces the power supply to operate in voltage mode, the keypad entries adjust
Prog
the actual current limit, contrary to the display indication.
If the load is enabled, and the power supply is commanded to operate in Voltage mode, but
R
< V
L
Prog
/ I
forces the power supply to operate in Current mode, the keypad entries adjust
Prog
the actual output current, contrary to the display indication.
Refer to PAR. 3.2.1.7.3 for procedure.
MBTSVC111609 3-21
3.2.1.7.3 PROCEDURE USING IADJ AND NUMERIC KEYPAD
1. Press Iadj.
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
or
Curr limit =
###V ###A
NOTES: indicates LED may be either on or off.
###V and ###A will either be actual or programmed values of output voltage/voltage
limit and output current/current limit (see Tables 3-9 and 3-10).
indicates that blinking “:” appears only for OUTPUT ENABLED status.
2. Enter current value via key pad, e.g., 2.1.
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
or
Curr limit = 2.1
###V ###A
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Output Curr =
###V ###A
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Output curr = 2.1
###V ###A
ENABLED
ENABLED
3. Press ENTER to confirm or CLEAR ENTRY to correct. Display will return to “Output is
OFF” or “Keypad control” display with either the new current value (ENTER) if the unit is
in current mode, or the old current value (CLEAR ENTRY). If the entered value is too high,
the display will indicate “Value too high,” then return to either “Output is OFF” or
“Keypad control” display, showing the previous value.
3.2.1.7.4 SLEW ( AND ) KEYS — M, MG MODELS
As described in PAR. 3.2.1.7.1 (M, MG Models) for the Iadj and numeric keys, the effect of the
slew keys is dependent upon model, commanded mode, output enabled/disabled, actual mode,
and the load.
Table 3-11 (M, MG Models) summarizes the effect of the slew keys for different conditions. The
first three columns reflect the status of the unit before the slew key is pressed. The fourth column shows how the adjustment will affect the status of the power supply. Refer to PAR.s 3.1.1
and 3.1.2 for more details regarding commanded and actual mode of operation (either voltage or
current).
3-22 MBTSVC111609
TABLE 3-11. USING SLEW KEYS ( AND ) TO SET OUTPUT
CURRENT/CURRENT LIMIT — MODELS M, MG
POWER SUPPLY STATUS BEFORE SLEW KEY ADJUSTED
COMMANDED
MODE
CURRENT * DISABLED VOLTAGE***** Programmed output current
CURRENT * ENABLED CURRENT Actual output current
CURRENT * ENABLED VOLTAGE **** Actual current limit **
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE **
(DICTATED BY LOAD)
SLEW KEYS
ADJUST:
VOLTAGE Either DISABLED
or ENABLED
* If the unit was programmed to Current mode remotely before being set to Local Mode, the unit will stay in current
mode until a Voltage Mode command is received.
** Overload” error message placed in error buffer (for use when operating in Remote mode).
*** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
**** Condition where load forces power supply mode.
***** Forced by the power supply
Either VOLTAGE
or CURRENT
No effect on current
The slew keys are not operational when the power supply is in Remote mode, when you enter
the MENU (PAR. 3.2.2), or PROGRAM REV/CHG (PAR. 3.2.1.11.1) functions, or when a program is running (PAR.s 3.2.1.11.3 and 3.2.1.11.5).
Table 3-11 shows that with the power supply commanded to operate in voltage mode, the slew
keys have no effect on current.
If the power supply was operating in a remote configuration, it is possible to use the slew keys to
locally adjust current/current limit only if the power supply was commanded to operate in Current mode before being set into Local mode. If the output is disabled, the slew keys adjust programmed output current. If the output is enabled and the load permits the power supply to
operate in Current mode, the slew keys adjust actual output current; If the load forces the power
supply to operate in Voltage mode, the slew keys adjust actual current limit.
Pressing the key increases the output current/current limit (see Table 3-11) by the slew key
I range value which was previously set using the MENU (see PAR. 3.2.2). For example, if the
current limit is 1.0A (Current mode, output enabled), and the slew key I range value is 0.10A,
pressing the key twice changes the output current to 1.2A. The key operates similarly to
decrease current limit by the slew key I range value.
3.2.1.7.5 SLEW ( AND ) KEYS — MR, MGR MODELS
As described in PAR. 3.2.1.7.2 (MR, MGR Models) for the Iadj and numeric keys, the effect of
the slew keys is dependent upon model, commanded mode, output enabled/disabled, actual
mode, and the load.
Table 3-12 (MR, MGR Models) summarizes the effect of the slew keys for different conditions.
The first three columns reflect the status of the unit before the slew key is pressed. The fourth
column shows how the adjustment will affect the status of the power supply. Refer to PAR.s
MBTSVC111609 3-23
3.1.1 and 3.1.2 for more details regarding commanded and actual mode of operation (either voltage or current).
TABLE 3-12. USING SLEW KEYS ( AND ) TO SET OUTPUT
CURRENT/CURRENT LIMIT — MODELS MR, MGR
POWER SUPPLY STATUS BEFORE SLEW KEY ADJUSTED
SLEW KEYS
ADJUST:
COMMANDED
MODE
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE **
(DICTATED BY LOAD)
VOLTAGE Either DISABLED
or ENABLED
CURRENT DISABLED CURRENT**** Programmed output current
CURRENT ENABLED CURRENT Actual output current
CURRENT ENABLED VOLTAGE *** Actual Current limit *
* Overload” error message placed in error buffer (for use when operating in Remote mode).
** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
*** Condition where load forces power supply mode.
**** Forced by the power supply.
Either VOLTAGE
or CURRENT
No effect on current
The slew keys are not operational when the power supply is in Remote mode, when you enter
the MENU (PAR. 3.2.2), or PROGRAM REV/CHG (PAR. 3.2.1.11.1) functions, or when a program is running (PAR.s 3.2.1.11.3 and 3.2.1.11.5).
Table 3-12 shows that with the power supply commanded to operate in Voltage mode, the slew
keys have no effect on current or current limit.
If the power supply is commanded to operate in a Current mode and the output is disabled, the
slew keys adjust programmed output current. If the output is enabled and the load permits the
power supply to operate in Current mode, the slew keys adjust actual output current; if the load
forces the power supply to operate in Voltage mode, the slew keys adjust actual current limit.
Pressing the key increases the output current/current limit (see Table 3-12) by the slew key
I range value which was previously set using the MENU (see PAR. 3.2.2). For example, if the
current limit is 1.0A (Current mode, output enabled), and the slew key I range value is 0.10A,
pressing the key twice changes the output current to 1.2A. The key operates similarly to
decrease current limit by the slew key I range value.
3.2.1.7.6 CURRENT CONTROL — M, MG MODELS
As described in PAR. 3.2.1.7.1 above for the Iadj and numeric keys, the effect of the CURRENT
control is dependent upon model, commanded mode, output enabled, actual mode, and the
load.
Table 3-13 (M, MG Models) summarizes the effect of the CURRENT control adjustments for different conditions. The first three columns reflect the status of the unit before the CURRENT control is adjusted. The fourth column shows how the adjustment will affect the status of the power
supply. Refer to PAR.s 3.1.1 and 3.1.2 for more details regarding commanded and actual mode of
operation (either voltage or current).
3-24 MBTSVC111609
The CURRENT control is not operational when the power supply is in Remote mode or when
you enter the MENU (PAR. 3.2.2), PROGRAM REV/CHG (PAR. 3.2.1.11.1) functions, or when a
program is running (PAR.s 3.2.1.11.3 and 3.2.1.11.5).
Rotating the CURRENT control clockwise increases output current/current limit; counterclockwise decreases output current/current limit.
TABLE 3-13. USING CURRENT CONTROL TO SET OUTPUT
CURRENT/CURRENT LIMIT — MODELS M, MG
POWER SUPPLY STATUS BEFORE CURENT CONTROL ADJUSTED
COMMANDED
MODE
VOLTAGE DISABLED VOLTAGE***** Programmed current limit
VOLTAGE ENABLED VOLTAGE Actual current limit
VOLTAGE ENABLED CURRENT **** Actual output current **
CURRENT * DISABLED VOLTAGE***** Programmed output current
CURRENT * ENABLED CURRENT Actual output current
CURRENT * ENABLED VOLTAGE **** Programmed current limit **
* If the unit was programmed to Current mode remotely before being set to Local Mode, the unit will stay in current
mode until a Voltage Mode command is received.
** “Overload” error message placed in error buffer (for use when operating in Remote mode).
*** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
**** Condition where load forces power supply mode.
***** Forced by the power supply.
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE ***
(DICTATED BY LOAD)
CURRENT CONTROL
ADJUSTS:
Table 3-13 shows that with the power supply commanded to be in Voltage mode and the output
disabled, the VOLTAGE control adjusts the programmed output voltage.
If the output is enabled and the value of the load is greater than or equal to the value of programmed voltage divided by programmed current (R
in Voltage mode and the CURRENT control adjusts actual current limit. This will not be apparent
from the display indication; to see the revised current limit it is necessary to view status by
pressing SHIFT then (.) on the keypad.
If the output is enabled and the value of the load is less than the value of programmed voltage
divided by programmed current (R
< V
L
Prog
/ I
Current mode and the CURRENT control will adjust actual output current.
When conditions dictate that the CURRENT control adjusts current limit, it will not be apparent
from the display indication; to see the revised current limit it is necessary to view status by
pressing SHIFT then (.) on the keypad
3.2.1.7.7 CURRENT CONTROL — MR, MGR MODELS
As described in PAR. 3.2.1.7.1 above for the Iadj and numeric keys, the effect of the CURRENT
control is dependent upon model, commanded mode, output enabled, actual mode, and the
load.
≥ V
L
), the power supply will be forced to operate in
Prog
Prog
/ I
), the power supply operates
Prog
MBTSVC111609 3-25
Table 3-14 (MR, MGR Models) summarizes the effect of the CURRENT control adjustments for
different conditions. The first three columns reflect the status of the unit before the CURRENT
control is adjusted. The fourth column shows how the adjustment will affect the status of the
power supply. Refer to PAR.s 3.1.1 and 3.1.2 for more details regarding commanded and actual
mode of operation (either voltage or current).
The CURRENT control is not operational when the power supply is in Remote mode or when
you enter the MENU (PAR. 3.2.2), PROGRAM REV/CHG (PAR. 3.2.1.11.1) functions, or when a
program is running (PAR.s 3.2.1.11.3 and 3.2.1.11.5).
Rotating the CURRENT control clockwise increases output current/current limit; counterclockwise decreases output current/current limit.
TABLE 3-14. USING CURRENT CONTROL TO SET OUTPUT
CURRENT/CURRENT LIMIT — MODELS MR, MGR
POWER SUPPLY STATUS BEFORE CURENT CONTROL ADJUSTED
COMMANDED
MODE
CURRENT DISABLED CURRENT***** Programmed output current
VOLTAGE DISABLED VOLTAGE***** Programmed current limit
CURRENT ENABLED CURRENT Actual output current
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE ***
(DICTATED BY LOAD)
CURRENT CONTROL
ADJUSTS:
CURRENT ENABLED VOLTAGE **** Actual Current limit **
VOLTAGE ENABLED VOLTAGE Actual Current limit
VOLTAGE ENABLED CURRENT **** Actual output current **
* If the unit was programmed to Current mode remotely before being set to Local Mode, the unit will stay in current
mode until a Voltage Mode command is received.
** “Overload” error message placed in error buffer (for use when operating in Remote mode).
*** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
**** Condition where load forces power supply mode.
***** Forced by the power supply.
Table 3-14 shows that if the output is disabled, with the power supply commanded to be in Cur-
rent mode, the CURRENT control adjusts the programmed output current; with the power sup-
ply commanded to be in Voltage mode, the CURRENT control adjusts programmed current
limit.
With the power supply commanded to be in Current mode, if the output is enabled and the value
of the load is less than the value of programmed voltage divided by programmed current
(R
L
< V
Prog
/ I
), the power supply operates in Current mode and the CURRENT control
Prog
adjusts actual output current. If the output is enabled and the value of the load is greater than or
equal to the value of programmed voltage divided by programmed current (R
≥ V
L
Prog
the power supply will be forced to operate in Voltage mode and the CURRENT control will
adjust actual current limit (this will not be apparent from the display indication; to see the revised
current limit it is necessary to view status by pressing SHIFT then (.) on the keypad).
/ I
Prog
),
If the power supply is commanded to be in Voltage mode with the load enabled and the load
permits the power supply to operate in Voltage mode, the CURRENT control adjusts the actual
current limit (this will not be apparent from the display indication; to see the revised current limit
3-26 MBTSVC111609
it is necessary to view status by pressing SHIFT then (.) on the keypad). If the load forces the
power supply to operate in Current mode, the CURRENT control adjusts actual output current.
3.2.1.8 SETTING VOLTAGE MODE OR CURRENT MODE
Although all MBT Power Supplies automatically switch between Voltage mode and Current
mode depending upon the programmed values for output voltage/current, the voltage/current
limit values, and the value of the load (see PAR. 3.2.1.7.1), commanding the power supply to go
into Voltage mode or Current Mode causes the internal microcontroller to monitor either voltage
or current, respectively, for fault and overload error conditions. If an error condition is detected,
an error message is stored in the error buffer (this has no effect when operating in Local mode).
3.2.1.8.1 M, MG MODELS
The M and MG models can be commanded to Voltage mode from the front panel. Current mode
can not be set from the front panel, but units installed in a remote configuration can be commanded to go into Current mode using remote commands. If the power supply was commanded
to be in Current mode before being set to Local mode, the slew keys will adjust current (see
PAR.s 3.2.1.6.4 and 3.2.1.7.4). For the slew keys to adjust voltage it is necessary to command
the unit to be in Voltage mode as follows:
1. The display should be reading either “Output is off” (PAR. 3.2.1.5.1, step 1) if the output is disabled, or “Keypad control” (PAR. 3.2.1.5.1, step 2) if the output is enabled.
2. To ensure that the power supply is set to Voltage mode, press SHIFT then Vadj keys. The
message “No relay present” appears briefly, then the display will revert back to either
“Output is off” if the output is disabled, or “Keypad control” if the output is enabled.
(Pressing SHIFT then Iadj will cause the same messages to appear, but will have no other
effect.)
3.2.1.8.2 MR, MGR MODELS
The MR and MGR models can be commanded to either Voltage Mode or Current mode from the
front panel. Internal relays within the power supply act to establish the commanded mode. For
Voltage mode the relays will either connect (output enabled) or disconnect (output disabled) the
load. For Current mode the relays either short the output internally with the load connected (output disabled) or remove the short with the load connected (output enabled); refer to PAR.s
4.1.11 and 4.1.13 for details regarding enabling and switching sequences.
VOLTAGE MODE — Commanding the power supply to go into Voltage mode causes the internal microprocessor to compare the output voltage to the programmed voltage and the output
current to the current limit to determine when an error condition has occurred. While the power
supply is in Voltage mode with the load enabled, the output voltage will remain constant at the
programmed value, while the current will vary depending on the value of the load. If the load is
less than the programmed voltage divided by programmed current, the power supply will operate in Current mode (forced).
Commanding the power supply to go into Voltage mode (with output disabled) from Current
mode causes the output relays to disconnect the load and remove the internal short across the
power supply output. With the output disabled the VOLTAGE MODE indicator will go on and the
CURRENT MODE indicator will go off. If the output is enabled, the actual mode will be determined by the programmed voltage and current values relative to the load (see PAR. 3.2.1.7.1).
To command the power supply to go into Voltage mode, proceed as follows:
MBTSVC111609 3-27
1. Press SHIFT key; display resembles A or B below.
STATUS
A
MR, MGR models with
VOLTAGE
Output disabled
(commanded) Current
Mode
NOTE: A blinking “sh” is represented by sh to indicate that the SHIFT
key has been pressed, and the next key that is pressed will be
interpreted with the alternate meaning.
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
Output is OFF
***V ***A sh
NOTE:
***V and ***A are
the output voltage and current
settings in effect
at time of last
operation (for
first time use, the
voltage and current are set to 0).
B
STATUS
MR, MGR models with
VOLTAGE
Output enabled
(actual) Voltage Mode
NOTE: Although Current mode is shown above, the actual mode is
dependent upon the value of the load relative to programmed
voltage and current.
2. Press Vadj key to command the power supply to go into Voltage mode.; the display will
briefly display the message shown below:, then return to the “Output is OFF” or “Keypad
Control” message displayed before the SHIFT key was pressed.
STATUS
VOLTAGE
MODE
CURRENT
MODE
Const VOLT mode
***V ***A
NOTE: If output is enabled, a blinking “:” appears at the center of the
bottom line of the display and the VOLTAGE MODE and CURRENT MODE indicators reflect the actual mode of the power
supply as determined by the load
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Keypad control
***V ***A sh
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
ENABLED
CURRENT MODE — Commanding the power supply to go into Current mode causes the internal microprocessor to compare the output current to the programmed current and the output
voltage to the voltage limit to determine when an error condition has occurred. While the power
supply is in Current mode with the output enabled, the output current will remain constant at the
programmed value, while the voltage will vary depending on the value of the load. If the load is
3-28 MBTSVC111609
greater than or equal to the programmed voltage divided by programmed current, the power
supply will operate in Voltage mode (forced).
Commanding the power supply to go into Current mode (with output disabled) from Voltage
mode causes the output relays to put an internal short across the power supply output (allowing
the load to be connected/disconnected). With the output disabled the CURRENT indicator will
go on and the VOLTAGE indicator will go off. If the output is enabled, the actual mode will be
determined by the programmed voltage and current values relative to the load (see PAR.
3.2.1.7.1). To command the power supply to enter Current mode, proceed as follows:
1. Press SHIFT key; display resembles A or B below.
A
STATUS
MR, MGR models with
VOLTAGE
Output disabled
(commanded) Voltage
Mode
NOTE: (If previously set to Current mode, VOLTAGE MODE indicator
is off and CURRENT MODE indicator is on (internally relays
short the output).
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Output is OFF
***V ***A sh
STATUS
ENABLED
B
MR, MGR models with
Output enabled
(actual) Voltage Mode
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Keypad control
***V ***A sh
ENABLED
NOTE:
***V and ***A are
the output voltage and current
settings in effect
at time of last
operation (for
first time use, the
voltage and current are set to 0).
NOTE: Although Voltage mode is shown above, the actual mode is
dependent upon the value of the load relative to programmed
voltage and current.
MBTSVC111609 3-29
2. Press Iadj key to command the power supply to go into Current mode.; the display will
briefly display the message shown below:, then return to the “Output is OFF” or “Key-
pad Control” message displayed before the SHIFT key was pressed.
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
Const CURR mode
***V ***A
NOTE: If output is enabled, a blinking “:” appears at the center of the
bottom line of the display and the VOLTAGE MODE and CURRENT MODE indicators reflect the actual mode of the power
supply as determined by the load.
3.2.1.9 REVERSING DC OUTPUT POLARITY — MR, MGR MODELS
The display should be reading either “Output is off” (PAR. 3.2.1.5.1, step 1) if the output is
disabled, or “Keypad control” (PAR. 3.2.1.5.1, step 2) if the output is enabled.
1. Press SHIFT key. (Blinking “sh” appears on display.)
2. Press DC OFF (CHANGE POLARITY) key.
a. If changing from non-reversed to reversed, the display briefly shows:
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
NOTE: ###V and ###A represent
Polar Reversed
###V ###A
ENABLED
either actual power supply
output voltage and current
(output enabled) or programmed output and limit values (output disabled).
NOTES: indicates that blinking “:” appears only for OUTPUT ENABLED status.
The POLARITY REVERSED indicator will only go on when the output is
enabled.
A blinking “sh” is represented by
sh to indicate that the SHIFT key has
been pressed, and the next key that is pressed will be interpreted with the
alternate meaning.
3-30 MBTSVC111609
b. If changing from reversed to non-reversed, the display briefly shows
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
Polar Nonrevrsed
###V ###A
NOTE: indicates that blinking “:” appears only for OUTPUT
ENABLED status.
c. Display returns to “Output is OFF” or “Keypad control” display.
3. To go back to previous polarity, press SHIFT then DC OFF.
3.2.1.10 CHANGING THE GPIB ADDRESS
The display should be reading either “Output is off” (PAR. 3.2.1.5.1, step 1) if the output is
disabled, or “Keypad control” (PAR. 3.2.1.5.1, step 2) if the output is enabled.
1. Press SHIFT key. (Blinking “sh” appears on display.)
2. Press DELAY (GPIB ADDRESS key).
STATUS
REMOTE OUTPUT
ENABLED
NOTE: ###V and ###A represent
either actual power supply
output voltage and current
(output enabled) or programmed output and limit values (output disabled).
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
NOTE: ###V and ###A represent
either actual power supply
output voltage and current
GPIB address = 6
###V ###A
(output enabled) or programmed output and limit values (output disabled).
NOTE: The factory default address is 6.
3. If the GPIB Address is correct, press ENTER or CLEAR ENTRY to accept the GPIB
address displayed. Display returns to either “Output is off” (PAR. 3.2.1.5.1, step 1) if
the output is disabled, or “Keypad control” (PAR. 3.2.1.5.1, step 2) if the output is
enabled.
4. Enter new GPIB address — valid addresses are 0 to 30 (e.g., for address 9, enter 9).
STATUS
VOLTAGE
MODE
CURRENT
MODE
POLARITY
REVERSED
REMOTE OUTPUT
ENABLED
GPIB address = 9
###V ###A
MBTSVC111609 3-31
5. Press ENTER to confirm the new GPIB address or CLEAR ENTRY to accept previous setting. In either case the display returns to either “Output is off” (PAR. 3.2.1.5.1, step 1)
if the output is disabled, or “Keypad control” (PAR. 3.2.1.5.1, step 2) if the output is
enabled.
NOTE: The new GPIB address will be in effect the next time the unit is turned on; to make it
effective immediately, turn power to the MBT off, then on again.
3.2.1.11 LOCAL MODE PROGRAMMING OF THE POWER SUPPLY
The Local mode programming feature of the MBT Series Power Supply allows up to ten separate programs (0 to 9) to be set up via the keypad. Each program is a series of commands
(steps) which are set up prior to execution. A total of 99 steps are available, and since each program uses at least one step, this leaves 89 steps which can be split, as desired, among a maximum of ten programs; a single program may contain a maximum of 90 steps. Each step of a
program allows the MBT to be set to specific parameters for a specified period of time. Table 315 defines the five screens used to program each step.
Once a program is entered into the power supply, it remains in non-volatile memory, so that the
program can be recalled and executed again even if the unit was previously turned off.
For M and MG Models, each step allows the unit to select:
• Values for output voltage and current limit (Screen 0)
• the active time period for these values (screen 1)
NOTE: If the unit is forced into Current mode by the value of the load relative to programmed
current and voltage, the values programmed for output voltage and current limit will be
used for voltage limit and output current, respectively
For MR and MGR Models, each step allows the user to select:
• output voltage and current limit or output current or voltage limit values (Screen 0)
• the active time period for these values (Screen 1)
• voltage mode or current mode (Screen 2)
• polarity non-reversed or reversed
• output enabled or disabled.
3-32 MBTSVC111609
TABLE 3-15. PROGRAMMING MODE SCREENS
SCREEN FUNCTION DISPLAY
Displays voltage and current settings.
Screen 0
(Sc: 0)
Voltage and Current
Settings
Screen 1
(Sc: 1)
Delay
Screen 2
(Sc: 2)
Voltage/Current Mode
Select
Pr# Program number selected
Stp: Step number
Sc: Screen number
***V Programmed voltage value
Voltage Mode: output voltage
Current mode: voltage limit
***A Programmed current value
Voltage Mode: current limit
Current mode:output current
Displays delay time.
***s Time duration (in seconds) for
which programmed values of displayed
step will be active
Displays selected mode.
Pr#2 Stp: 0 Sc:0
***V ***A
NOTE: While the programming mode
screens are active (creating, changing, or observing screens 0 through
4) the status LEDs above the display
reflect the actual status of the power
supply, not the settings that are displayed for the programming mode
screens. (These settings are active
only when the program is executed.)
Pr#2 Stp: 0 Sc:1
Delay = ***s
Pr#2 Stp: 0 Sc:2
Const VOLT mode
or
(Models MR, MGR only)
Screen 3
(Sc: 3)
Polarity Select
(Models MR, MGR only)
Screen 4
(Sc: 4)
Output Enabled/Dis-
abled
(Models MR, MGR only)
Displays selected polarity.
Displays status of output.
Pr#2 Stp: 0 Sc:2
Const CURR mode
Pr#2 Stp: 0 Sc:3
Polar Nonrevrsed
or
Pr#2 Stp: 0 Sc:3
Polar Reversed
Pr#2 Stp: 0 Sc:4
Output Enabled
or
Pr#2 Stp: 0 Sc:4
Output Disabled
MBTSVC111609 3-33
3.2.1.11.1 ENTERING PROGRAM MODE
1. Press SHIFT key. (Blinking sh appears on display.)
2. Press MENU ON/OFF (REV/CHG PROGRAM) key
Rev/change PRG #
***V ***A
NOTE: indicates that a blinking “:” will
appear if output is enabled.
3. Select a Program # (0 to 9) by pressing the corresponding number key. (It is not necessary
to press ENTER.)
a. If the program is new (empty - no programmed steps stored), the display changes to:
Stp 0
End of program
Proceed to PAR. 3.2.1.11.2 to create a program.
b. If the Program # selected (e.g., 2) has been previously stored, the display changes to
one of the screens shown in Table 3-15. (The screen displayed is related to the last
screen displayed during a prior programming session.)
Proceed to PAR. 3.2.1.11.3 to execute the program, or PAR. 3.2.1.11.4 to modify the
program.
3.2.1.11.2 CREATING A NEW PROGRAM
To create a new program (display appears as shown in PAR. 3.2.1.11.1, step 3, above) it is necessary to insert “blank” steps using the ADD STEP function. These “blank” steps have the following default values listed in Table 3-4. Once the desired number of steps have been added,
programming the values is the same as described for reviewing/changing an existing program.
TABLE 3-16. DEFAULT PARAMETERS FOR NEW ADDED STEPS
PARAMETER VALUE
VOLTAGE 0 V
CURRENT 0 A
DELAY 0.1 SEC
MODE VOLTAGE
POLARITY NON-REVERSED
OUTPUT ENABLED
NOTE: The default values shown above are only for a completely new step. If the step was previ-
ously programmed, deleted, and then added again, the previous values will appear.
3-34 MBTSVC111609
The following step-by-step procedure explains how to enter a simple program to illustrate the
programming technique. The program to be entered is shown in Table 3-17; the values are arbitrary, for instructional purposes only.
TABLE 3-17. SAMPLE PROGRAM (ASSIGNED PROGRAM #2)
PROGRAM
STEP
(Stp: )
0 1.0V 2.1A 20s VOLTAGE
1 2.0V 1.3A 15s VOLTAGE REVERSED ENABLED
2 5.2V 3.3A 10s CURRENT
* MR and MGR Models only.
NOTE: It is recommended that programs be entered either by first adding the “blank” steps, then programming the values for
each screen of each step, or alternatively, by adding step 0, programming the values for each screen of step 0, then
adding step 1, programming the values for step 1, etc. There are, however, no restrictions on the sequence of programming steps other than “blank” steps must be added before they can be assigned values.
VOLTAGE CURRENT DELAY MODE * POLARITY * OUTPUT *
SCREEN 0 SCREEN 1 SCREEN 2 * SCREEN 3 * SCREEN 4 *
NON-
REVERSED
NON-
REVERSED
ENABLED
DISABLED
1. Press SHIFT, then press (ADD STEP) to add step 0. The display shows one of the
screen listed in Table 3-15 (depending upon the last screen displayed during a prior programming session).
NOTE: The screens may be programmed in any order. It is not necessary to change values if
the default values are correct, however it is recommended that all screens be checked.
2. Repeat step 1 above twice to add steps 1 and 2 to the program.
3. Press NEXT
Stp 3
End of program
4. Press NEXT again to display step 0.
NOTE: If Sc: 0 is not displayed, use or to
Pr#2 Stp: 0 Sc:0
***V ***A
cycle through the screens until Sc:0 is
displayed. (Remember, even though we
are programming screen 0 first, the
screens and steps may be programmed
in any order.)
5. You are ready to begin changing the default values of the added steps to new values.
Press Vadj
Const VOLT =
0.0V 0.00A
MBTSVC111609 3-35
6. Enter 1 (it is not necessary to key in insignificant zeroes, e.g., for 0.010, key in .01).
Const VOLT = 1
0.0V 0.00A
NOTE: If you make a mistake entering the value, press ENTER to confirm the incorrect
value, then repeat steps 5 and 6 to correct the voltage. This applies any time the
wrong value is keyed. If you press CLEAR ENTRY you will exit the Program mode,
and the display will return to either “Output is OFF” or “Keyboard control.”
7. Press ENTER.
Pr#2 Stp: 0 Sc:0
1.0V 0.00A
8. Press Iadj.
Curr limit =
1.0V 0.00A
9. Enter 2.1 and press ENTER.
Pr#2 Stp: 0 Sc:0
1.0V 2.10A
10. Press to display Sc: 1.
Pr#2 Stp: 0 Sc:1
Delay = 0.1s
11. Press DELAY (SEC).
Delay =
Delay = 0.1s
12. Enter 20 and press ENTER.
Pr#2 Stp: 0 Sc:1
Delay = 20s
NOTE: Steps 13 through 19 apply only to MR and MGR Models.
13. Press to display Sc: 2.
Pr#2 Stp: 0 Sc:2
Voltage mode
or
Pr#2 Stp: 0 Sc:2
Current mode
3-36 MBTSVC111609
14. If Voltage mode is already selected, proceed to step 15. To set Voltage mode, press
SHIFT, then Vadj. (When Current mode is desired, press SHIFT, then Iadj.)
15. Press to display Sc: 3.
Pr#2 Stp: 0 Sc:3
Polar nonrevrsed
16. If Polarity is already set to non-reversed, proceed to step 17. To set Polarity to nonreversed, press SHIFT, then DC OFF. (Pressing SHIFT then DC OFF will toggle Polarity
between reversed and non-reversed.)
17. Press to display Sc: 4.
Pr#2 Stp: 0 Sc:4
Output enabled
18. If Output is already set to Enabled, proceed to step 19. To set Output to Enabled, press DC
ON. (To select Output disabled press DC OFF.)
19. Press to display Sc: 0.
or
or
Pr#2 Stp: 0 Sc:3
Polar reversed
Pr#2 Stp: 0 Sc:4
Output disabled
Pr#2 Stp: 0 Sc:0
1.0V 2.10A
20. Press NEXT to display Sc: 0 for program step 1 (Stp: 1)
.
Pr#2 Stp: 1 Sc:0
0.0V 0.00A
21. Repeat procedural steps 5 through 12 (steps 5 through 19 for MR and MGR Models) above
to load the values for the screens (0 and 1, or 0 through 4) for program steps 1 and 2 (Stp:1
and Stp: 2) as specified in Table 3-17.
22. Press NEXT to display Stp: 3
Stp 3
End of program
3.2.1.11.3 RUNNING A PROGRAM
To run a program you must first enter Program mode (PAR. 3.2.1.11.1). Press SHIFT and
RESET (EXECUTE PROGRAM function) to execute the program once you have selected a program, created a new program (PAR. 3.2.1.11.2) or modified a program (PAR. 3.2.1.11.4). While
MBTSVC111609 3-37
the program is running, the display indicates the output voltage and current for each step (n)
while it is being executed:
VOLTAGE
MODE
CURRENT
MODE
Running Stp: n
###V ###A
The program will execute all steps once, and stop with the display reading:
VOLTAGE
MODE
CURRENT
MODE
Stp: n
End of program
3.2.1.11.4 MODIFYING A PROGRAM
1. To modify a program, you must first enter program mode and select the program (PAR.
3.2.1.11.1).
STATUS
POLARITY
REVERSED
STATUS
POLARITY
REVERSED
REMOTE OUTPUT
REMOTE OUTPUT
ENABLED
ENABLED
NOTE: ###V and ###A represent
either actual power supply output voltage and current (output
enabled), or programmed output and limit values (output disabled).
NOTE: For the sample program (PAR.
3.2.1.11.2), n = 2.
2. Press NEXT or PREVIOUS (SHIFT then NEXT) to display the step(s) that require modification.
3. Press or to display the Screen(s) that require modification.
4. Change the parameters by pressing the appropriate key(s) and changing the value (e.g., to
change the time duration for a step, display Screen 1 and press DELAY, enter the new
value, and press ENTER; this value has now been modified). After all parameters selected
for modification have been changed, press SHIFT then RESET to execute the program.
Once a parameter has been modified, the new value is stored, even if the unit is turned off.
5. To delete a step (with the exception of step 0), go to the step using NEXT (or SHIFT then
NEXT); press SHIFT then (DEL STEP function). The step is deleted and the display
shows the previous step.
6. To delete step 0, all the other steps must be deleted first. Use NEXT until display shows
the last step of the program.
Stp n
End of program
NOTE: n = the last step of the
program selected
3-38 MBTSVC111609
Then press SHIFT then (DEL STEP function), until display reads:
Stp 0
End of program
NOTE: If step 0 is deleted, the initial values for step 0 of a new program will be the same as
the deleted step 0.
3.2.1.11.5 CYCLING A PROGRAM
1. To cycle a program, first enter program mode and select a program. Press NEXT until the
display reaches the end of the program:
Stp n
End of program
2. Press SHIFT and 0. The display changes to:
Stp n Cycle On
End of program
3. Press SHIFT then RESET to execute the program. The program will run continuously, proceeding to execute step 0 after the last step is executed.
3.2.1.11.6 STOPPING A PROGRAM
There are two ways to stop a program:
1. Press CLEAR ENTRY key. The program will stop at the step in progress when CLEAR
ENTRY is pressed. The values programmed by that step will remain at the power supply
output. The display will be as shown below:
VOLTAGE
MODE
CURRENT
MODE
Pr# x Stp: x Sc:x
xxx...
STATUS
POLARITY
REVERSED
NOTE: n = the last step of the
REMOTE OUTPUT
ENABLED
program selected
NOTE: xxx = the message will depend
on which screen is displayed.
The screen displayed prior to
running the program will be
displayed when the program
stops.
2. Press RESET key. Operation of RESET is similar to CLEAR ENTRY above, with the fol-
lowing exception: pressing RESET forces the power supply output voltage and current to
zero. (For MR and MGR Models, the output is also disconnected from the load.)
To restart the program, press SHIFT then RESET to execute the program; the program will
restart from step 0 (Stp: 0).
MBTSVC111609 3-39
/1014
3.2.1.11.7 EXITING PROGRAM MODE
To exit Program Mode press CLEAR ENTRY after the program has been stopped (see PAR.
3.2.1.11.6).
1. If the output is enabled when CLEAR ENTRY is pressed, the display reverts to “Keypad
control” (PAR. 3.2.1.5.1, step 2).
2. If the output is disabled when CLEAR ENTRY is pressed, the display reverts to “Output
is off” (PAR. 3.2.1.5.2, step 1), except for Models M and MG where the program was
stopped with RESET: the display reverts to “Keypad control.”
3.2.1.11.8 SAMPLE PROGRAM OPERATION - MODELS M, MG
The following paragraphs describes how the MBT power supply operates, using the Sample
Program (3-17) for illustration. Figures 3-1 (M and MG Models) and 3-2 (MR and MGR Models)
show output voltage and current for the sample program (PAR. 3.2.1.11.2) when R
and when R
= 1 ohm
L
NOTE: Whenever a program is running, the STATUS indicators on the front panel represent
the actual condition of the power supply regarding Voltage or Current mode of operation, the polarity of the output, and whether the output is enabled or disabled.
During step 1, the programmed values of voltage/current with a load of either 1 ohm or 2 ohms
allow the power supply to operate in Voltage mode (current drawn by the load is within the current limit of 2.1A).
= 2 ohms,
L
During step 2, the power supply continues to operate in voltage mode with the 2 ohm load, however with a 1 ohm load, the power supply is forced into Current mode (even though the commanded mode is Voltage mode) since 2V into a load of 1 ohm would produce a current (2A)
greater than the current limit (1.3A). Current is limited to 1.3A and voltage is at 1.3V (1.3A into a
1 ohm load). For MR and MGR Models, since polarity is reversed for this step, Figure 3-2 shows
negative values for voltage and current.
For M and MG models, during step 3 the power supply continues to operate in voltage mode for
the 2 ohm load. For the 1 ohm load, however, current is limited to 3.3A, so the power supply is
forced into Current mode with the voltage at 3.3V (3.3A into a 1 ohm load).
For MR and MGR models, during step 3 the power supply is commanded to operate in Current
mode with the output disabled, so the output/polarity reversal relays short the output, forcing
output voltage and current to zero.
3-40 MBTSVC111609
FIGURE 3-1. SAMPLE PROGRAM OPERATION FOR M, MG MODELS
MBTSVC111609 3-41
FIGURE 3-2. SAMPLE PROGRAM OPERATION FOR MR, MGR MODELS
3-42 MBTSVC111609
SECTION 321118217 -
3.2.2 USING THE MENU SYSTEM
To enter the Menu, press the MENU ON/OFF Key. The functions listed in Table 3-18 are available and can be displayed one at a time by pressing NEXT, or SHIFT then NEXT (PREVIOUS),
to “navigate” through the Menu options. To select the displayed option, press ENTER key.
TABLE 3-18. MENU FUNCTIONS
DISPLAY FUNCTION
Speaker On/Off
Control lockout
Remote channel
Calibration
OVP, OCP setup
Slew key set-up
Rem Dsp Blanking
GPIB addressing
Compatible Mode
Command Language
Enables or disables audible beep heard when keypad keys are pressed (factory default =
speaker on).
Disables VOLTAGE and CURRENT controls (factory default = controls unlocked).
Enter Remote mode to control another power supply from keypad.
Provides procedure for calibrating the power supply.
Establishes Overvoltage and Overcurrent protection values.
Establishes the increment for voltage/current increase/decrease produced by one press of a
slew key.
Disables display updateing during remote operation
Allows selection of primary or secondary GPIB addressing
Allows selection of Compatibility mode for certain features
Allows selection of SCPI or CIIL for remote programming
3.2.2.1 SPEAKER ON/OFF
1. Press MENU ON/OFF to enter the Menu, then press NEXT until “Speaker On/Off” is
displayed:
Speaker On/Off
Next/Enter
press ENTER to select this function.
2. Screen displays either “Speaker Enabled” or “Speaker Disabled”. Use the slew keys
to toggle between the two options.
3. Once the unit is set to the desired option, press MENU ON/OFF key to return to menu
level; press it again to exit the menu system.
3.2.2.2 CONTROLS LOCK-OUT
This option is used to lock-up (disable) the VOLTAGE and CURRENT controls and the slew
keys. When locked, the voltage and current parameters can only be modified by numeric keypad entry using Vadj and Iadj keys.
1. Press MENU ON/OFF to enter the Menu, then press NEXT until “Control lockout”
message is displayed; press ENTER to select this function.
MBTSVC111609 3-43
2. The display shows either “Controls unlocked” or “Controls locked;” use the slew
keys to toggle between the two options.
3. Press MENU ON/OFF to return to menu level; press it again to exit the menu system.
3.2.2.3 REMOTE CHANNEL
This function is used to remotely control other power supplies from the front panel of an MBT
power supply included in the remote configuration (see PAR. 1.4.1 and 1.4.2).
3.2.2.3.1 GENERAL NOTES FOR REMOTE CONFIGURATIONS USING IEEE 1118 BUS
1. The remote configuration must have one (and only one) MBT configured as a controller
(“G” option enabled) on the IEEE 1118 bus.
2. Each power supply in the configuration must be preset with unique node addresses.
3. No more than 27 units can be connected to a remote configuration.
4. The units must remain powered down for approximately 10 seconds before power is
restored to allow the internal memory chips to stabilize.
5. When applying power to units in a remote configuration, the unit with the “G” option
enabled must be the last unit powered up.
6. Any MBT front panel (keypad and display) can be used to control any other power supply in
the configuration (regardless of which power supply has the “G” option enabled).
7. Upon initiating remote operation, it is necessary to send commands for output status,
polarity (MR and MGR Models) and mode, for the display to be updated.
8. Status LEDs of the controlling power supply reflect the controlling power supply status, not
the controlled power supply.
9. It is possible for an MG or MGR Model to be remote controlled using its own keypad, thus a
single unit with “G” option enabled could be operated in remote mode using its own keypad. As an example, an MG Model could be commanded to enter Current mode by remote
control even though a Current mode command will not be accepted through Local mode
SHIFT then Iadj command.
10. Remote control only affects the controlled power supply after the first command is issued.
Once the first command is issued, the display of the controlled power supply reads
“Remote control” and its Local keypad is disabled.
11. The controlled power supply remains in “Remote control” status even after the controlling power supply exits remote control operation. To put the controlled power supply into
Local mode, press SHIFT then CLEAR ENTRY.
3-44 MBTSVC111609
12. The functions available from the controlling power supply keypad are:
Voltage Mode SHIFT then Vadj
Current Mode SHIFT then Iadj
Change Polarity SHIFT then DC OFF (for MR, MGR Models only)
Output Enable DC ON
Output Disable DC OFF
Voltage Adjust Vadj, numeric, then ENTER
Current Adjust Iadj, numeric, then ENTER
Reset RESET
3.2.2.3.2 REMOTE OPERATION USING KEYPAD TO CONTROL ANOTHER MBT POWER SUPPLY
The following steps are performed at the controlling power supply.
1. Press MENU ON/OFF to enter the Menu, then press NEXT until “Remote Channel” is
displayed; press ENTER to select this function.
Enter Node #
2. Enter the node number (address) of the power supply to be controlled. This is a number
between 1 and 31 (the node address is set via DIP switch A3S1 accessed through the top
cover; see PAR. 2.6.1). MBT power supplies are shipped with the node address set to a
default value of 1. Enter the node number and press ENTER.
a. If the node address does not exist, or the connection through the IEEE 1118 bus is not
valid, the display will briefly read:
Communication
ERROR
then the unit will return to Menu level with the display reading “Remote Channel.”
Press MENU ON/OFF again to exit the Menu.
b. If the selected unit (node) is present and the control lines operational, the display reads
wait...
followed by
MDL X - Y
NOTE: MDL X -Y refers to the MBT Model, of
the power supply to be controlled (e.g.,
MBT 100-3.6), where X is the nominal
voltage rating (100) and Y is the nominal current rating (3.6).
:
MBTSVC111609 3-45
followed by
#n M1; M2; M3
***V ***A
NOTE: the status LEDs above the dis-
play reflect the actual status of
NOTE: A blinking “:” is represented by “ ” to
indicate that the values displayed on
the bottom line of the alphanumeric
display are “live,” i.e., actual values at
the power supply output.
the controlling power supply,
not the settings of the controlled power supply.
n = node address of the controlled power supply
M1 = message showing the commanded mode of operation for the controlled power sup-
ply:
VM — Voltage Mode
CM — Current Mode
VL — Voltage Limit: indicates that the controlled power supply was commanded to
be in Current mode but the load is forcing it to operate in Voltage mode.
CL — Current Limit: indicates that the controlled power supply was commanded to
be in Voltage mode, but the load is forcing it to operate in Current mode.
M2 = message showing the commanded polarity of the controlled power supply:
P+ — Polarity plus (non-reversed)
P- — Polarity minus (reversed) (available on MR and MGR Models only)
M3 = message showing the commanded output status of the controlled power supply:
OD — Output Disabled
OE — Output Enabled
***V and ***A indicate the output values of the controlled power supply:
If the controlled MBT power supply is an M or MG Model, this represents actual output
values of the controlled power supply. (When output is disabled, 0V and 0A are the
true outputs.)
If the controlled MBT power supply is an MR or MGR Model, this represents actual
output values of the controlled power supply if the output is enabled; if the output is
disabled, this represents the internal output of the controlled power supply since the
load will either be isolated (commanded Voltage mode) or short-circuited (commanded Current mode). The display will show programmed voltage and 0A for commanded Voltage mode, and 0V and programmed current for commanded Current
mode.
3-46 MBTSVC111609
NOTE: You can now use the keypad of the controlling power supply to set parameters for the
controlled power supply. However, the messages and values displayed in step 2 above
are not valid at this time. These messages/values are stored in the buffer of the controlling power supply; they are updated with valid information from the controlled power
supply only by executing the commands indicated in steps 3 through 5 below.
3. Ensure that the controlled power supply output is disabled by pressing DC OFF. Message
M3 in the upper right corner of the display reads OD. (Remember, this command must be
executed even if the display already reads OD to begin with.)
4. If the controlled power supply is a Model MR or MGR unit, press SHIFT then DC OFF.
Read Message M2 on the display to establish the existing polarity of the controlled power
supply (P+, non-reversed or P−, reversed). To toggle the polarity press SHIFT then DC
OFF. (Again, this command must be executed even if the original polarity displayed is the
desired polarity.)
5. Set the commanded mode of the controlled power supply by pressing SHIFT and either
Vadj (for commanded Voltage mode) or Iadj (for commanded Current mode). Message M1
on the display will verify that the controlled power supply is commanded to Voltage mode
(VM) or Current mode (CM). (Again, this command must be executed even if the display
originally showed the correct mode.)
6. If the controlled power supply is an M or MG Model, it is recommended that the voltage and
current values be reintroduced, even if the values shown are correct (If these values are
not set at this time and the output is disabled, then enabled, the output values will stay at
zero when the output is enabled.)
NOTE: When the controlled power supply is an M or MG Model, sending an output voltage or
output current parameter will cause the output to be enabled.
Set output voltage or voltage limit by pressing Vadj, entering the numeric value, and pressing ENTER; set output current or current limit by pressing Iadj, entering the numeric value,
and pressing ENTER.
7. To end the remote controlling operation press MENU ON/OFF; the unit will return to Menu
level with the display reading “Remote Channel.” Press MENU ON/OFF again to exit the
Menu.
3.2.2.4 CALIBRATION
1. Press MENU ON/OFF to enter the Menu, then press NEXT until “Calibration” is displayed; press ENTER to select this function.
2. The steps on the display guide you through the calibration procedure (refer to PAR. 5.5 for
details). Press NEXT to advance to the next step of the procedure.
3. Once “End of Calibration” screen is reached, press either NEXT or MENU ON/OFF
keys to return to menu. Press MENU ON/OFF again to exit the menu system.
3.2.2.5 OVP, OCP SET-UP
This function is used to set Over-Voltage (OVP) and Over-Current (OCP) protection values. The
unit will not allow programmed values or actual outputs above these limits.
MBTSVC111609 3-47
NOTE: The OVP and OCP function is inoperative when the power supply is being controlled
remotely (Remote mode). Remote operation automatically establishes the nominal values of the power supply as the OVP and OCP values. When the power supply is subsequently placed in Local mode, the nominal values for OVP and OCP remain. (For
example, the MBT 100-3.6 will be programmed to OVP value of 100V and OCP value
of 3.6A when placed into Local mode after remote operation.
1. Press MENU ON/OFF to enter the Menu, then press NEXT until “OVP, OCP Set-up” is
displayed; press ENTER to select this function.
OVP = ***
OCP = ***
2. Unit displays the actual programmed values. Factory default values are the nominal output
Voltage and Current. (e.g., for Model MBT 15-20MG, factory default values are OVP=15.00
V and OCP=20.00 A).
3. To set different values press Vadj key and enter new OVP value and/or Iadj key and enter
new OCP value.
OVP = ***
Max Volt =
4. Press ENTER to accept new value; the display will be similar to step 1 above, with the new
value.
NOTE: If the programmed value is larger than the nominal value for the power supply (e.g.,
setting OVP on a Model 100-3.6 to 120V), the OVP will be set to the nominal value (in
this case 100V) instead of the programmed value without any warning message.
Repeat step 3 if readjustment is desired.
5. Press MENU ON/OFF to return to menu level. Press it again to exit the menu system.
NOTE: *** indicates values set
for overvoltage and overcurrent protection.
OCP = ***
Max Curr =
3.2.2.6 SLEW KEY INCREMENTS SET-UP
The slew keys can be adjusted to increment/decrement voltage/current by a specific value. The
slew key values range from a minimum of one digit above the resolution of the unit adjustment
to a maximum of 1V for voltage and 1A for current. The resolution of the slew key adjustment is
1 LSB (least significant bit, equal to 0.024% of nominal value).
1. Press MENU ON/OFF to enter the Menu, then press NEXT until “Slew key Set-up” is
displayed; press ENTER to select this function.
2. The unit displays the actual programmed values. Factory default values are: 0.1V for voltage and 0.1A for current.
3. To set different values, press Vadj key and enter the new value for voltage increment. Similarly, press Iadj key and enter the new value for current increment.
NOTE: When entering the slew key increment value, notice that the display allocates room for
a figure of four decimal places (maximum). After pressing ENTER (step 4. below), the
3-48 MBTSVC111609
displayed value for slew key increment will only show two decimal places, however the
true four-decimal place value is stored internally and is the actual value added/subtracted when a slew key is pressed. (For example, entering an increment of “.0055”
will result in a displayed value of “0.00;” pressing the slew key continuously for a
period of time in “Output is OFF” or Keypad control” status will verify that the programmed or actual value is changing.)
4. Press ENTER to accept the new value; the display shows the new slew key increment values.
NOTE: If a value greater than 1 (V or A) is entered, the adjustment will be set to 1 (maximum
value) without any warning message. Repeat step 3. to readjust, as desired.
5. Press MENU ON/OFF to return to the menu level. Press it again to exit the menu system.
3.2.2.7 REMOTE DISPLAY BLANKING
The front panel display may be blanked or disabled during remote operation. This may improve
the response time of the MBT unit during quick, successive remote operations. The dispaly may
be disabled either temporarily for a selected number of seconds, or continuously once a remote
command is received, until the unit is powered off. While the display is disabled, it will show the
message "REMOTE CONTROL".
1. Press MENU ON/OFF to enter the menu, then NEXT until "Rem Dsp Blanking" is displayed; press ENTER to select this function.
2. The unit will display "Don't Blank," "Stay Blank," or the number of seconds (1, 3,
or 10) to keep the display disabled. Use the slew keys to select the mode that you prefer.
3. Press MENU ON/OFF to return to menu level. Press it again to exit menu system.
3.2.2.8 GPIB ADDRESSING MODE
The MBT-G supports either Primary or Secondary addressing mode for GPIB remote programming. In the Secondary addressing mode, the secondary address is the channel number to
which the command will be sent. Otherwise, the channel number is selected by use of the
"INSTR" command, or by appending the channel number to the command itself.
1. Press MENU ON/OFF to enter the menu, then NEXT until "GPIB addressing" is displayed; press ENTER to select this function.
2. The display shows either "Pri.Addressing" or "Sec.Addressing." Use the slew
keys to toggle between the two modes.
3. Press MENU ON/OFF to return to menu level. Press it again to exit menu system.
3.2.2.9 COMPATIBLITY MODE
The MBT-G has 2 compatibilty modes, Off and ON. When selected to be ON, the unit is backward compatible with older Kepco products. When OFF, the unit is completely compatible with
the 488.2 and SCPI standards. Table 3-19 below describes the differences.
MBTSVC111609 3-49
TABLE 3-19. MBT-G COMPATIBILITY MODES
Function MODE 0 (OFF) MODE 1 (ON)
Device Clear Does not reset power modules Resets all power modules
Status Uses Status Instrument Registers Does not use Status Instrument Registers
PON enable All status register enables are set to 0 All status register enables are set to 32767
syst:vers? returns 1997.0 returns blank string
1. Press MENU ON/OFF to enter the menu, then NEXT until "Compatible Mode" is displayed; press ENTER to select this function.
2. The display shows either "Compatibility ON" or "Compatibility OFF." Use the
slew keys to toggle between the 2 modes.
3. Press MENU ON/OFF to return to menu level. Press it again to exit menu system.
3.2.2.10 COMMAND LANGUAGE
The MBT-G allows selection of either SCPI or CIIL command languages for remote programming.
1. Press MENU ON/OFF to enter the menu, then NEXT until "Command Language" is dis-
played; press ENTER to select this function.
2. The display shows either "SCPI Programming" or "CIIL Programming." Use the
slew keys to toggle between the 2 modes.
3. Press MENU ON/OFF to return to menu level. Press it again to exit menu system.
3.3 REMOTE MODE PROGRAMMING
NOTE: The VISA query function (included in the latest versions of the VISA libraries) is not
supported by the MBT Power Supply. In newer XP and Vista computers a delay is
needed to insure the MBT Power Supply has time to return the response to the query.
The VISA query has no provisions to add a delay, nor can it issue a series of read
strobes between sending the request and receiving data from the device. Instead of
the VISA query, use one of the two methods described below. Method 2 is recommended.
1. Use a VISA Write followed by VISA Read with a small delay between the functions.
The delay is determined by computer speed. A 2 millisecond delay between the Write
and Read functions will be sufficient to insure that there is enough time to receive a
response for all valid queries.
2. Follow the VISA Write with a series of VISA Read strobes while waiting for the data
available bit to be true, followed by the VISA Read function when data is available. This
method provides the highest throughput.
3-50 MBTSVC111609
3.3.1 GENERAL
Kepco MBT Power Supplies (Models MG and MGR, with the “G” option enabled) may be programmed over a control bus using either SCPI (Standard Commands for Programmable Instruments) or CIIL (Control Interface Intermediate Language) commands. SCPI and CIIL provide a
common language conforming to IEEE488.2 for instruments used in an automatic test system.
The control bus can be either the IEEE 488 standard communication bus (General Purpose
Interface Bus, GPIB), or the RS232C communication bus. (Refer to Table 2-2 for input/output
signal allocations.) Most power supply functions available from the keypad can be programmed
via Remote command.
3.3.2 IEEE 488 (GPIB) BUS PROTOCOL
Table 3-20 defines the interface capabilities of the MBT power supply (Talker/Listener) relative
to the IEEE 488 (GPIB) bus (reference document ANSI/IEEE Std 488: IEEE Standard Digital Inter-
face for Programmable Instrumentation) communicating with a Host Computer—Controller (Talker/
Listener).
TABLE 3-20. IEEE 488 (GPIB) BUS INTERFACE FUNCTIONS
FUNCTION
Source Handshake SH1 Complete Capability (Interface can receive multiline messages)
Acceptor Handshake AH1 Complete Capability (Interface can receive multiline messages)
Ta lk er T 6
Listener L4 Basic listener, unaddress if MTA (My Talk Address) (one-byte address).
Service Request SR1
Remote/Local RL1
Parallel Poll PP0 No Capability
Device Clear DC1
Device Trigger DT0 No Capability
Controller C0 No Capability
SUBSET
SYMBOL
Basic talker, serial poll, unaddress if MLA (My Listen Address) (one-byte
address)
Complete Capability. The interface sets the SRQ line true if there is an
enabled service request condition.
Complete capability. Interface selects either local or remote information. In
local mode the MBT executes front panel commands, but can be set to
remote mode via IEEE 488 bus. When in Remote mode (REMOTE status
indicator on) all front panel keys except LOCAL function (SHIFT then
CLEAR ENTRY) are disabled. LOCAL function can be disabled using programmed local lockout command so that only the controller or a power on
condition can restore Local mode.
Complete Capability. MBT accepts DCL (Device Clear) and SDC (Selected
Device Clear).
COMMENTS
Tables 3-21 and 3-22 define the messages sent to the MBT, or received by the MBT, 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 MBT power supply operating is either
a Talker or a Listener.
MBTSVC111609 3-51
3.3.2.1 STRING PARSING
When the MBT power supply is in listen mode, strings are accepted. When the host controller
sends the last byte it can assert the EOI line to indicate the string is complete. The GPIB listener
function automatically adds a LF to terminate the string input. The parsing software then processes the string and if there are valid commands, the power supply is updated with the new
control input. Some GPIB host controllers do not have the ability to assert the EOI control line,
however the GPIB listener function will also terminate the string input when either a carriage
return (0d
) or Line Feed (0AH) character is received.
H
TABLE 3-21. IEEE 488 (GPIB) BUS COMMAND MODE MESSAGES
MNEMONIC MESSAGE DESCRIPTION COMMENTS
ATN Attention Received
DAC Data accepted Received or Sent
DAV Data Valid Received or Sent
DCL Device Clear Received
IFC Interface Clear Received
MLA My Listen Address Received
MTA My Talk Address Received
OTA Other Talk Address Received
RFD Ready for Data Received or Sent
SDC Selected Device Clear Received
SPD Serial Poll Disable Received
SPE Serial Poll Enable Received
SRQ Service Request Sent
UNL Unlisten Received
UNT Untalk Received
TABLE 3-22. IEEE 488 (GPIB) BUS DATA MODE MESSAGES
MNEMONIC MESSAGE DESCRIPTION COMMENTS
DAB
END
EOS
RQS
Data Byte Received or Sent
End Received or Sent
End of String Received or Sent
Request Service Sent
STB
Status Byte Sent
3-52 MBTSVC111609
3.3.3 RS232-C BUS PROTOCOL
The MBT power supply may be operated remotely via an RS232-C terminal, or from a PC using
a terminal emulation program. The following settings must be observed:
• Baud rate: 9600
• Parity: None
•Data Bits8
• Stop Bits 1
• Echo ON
• XON OFF
The above settings are established by the firmware and cannot be changed by the user
although firmware with alternate settings can be ordered. It is recommended that the user program the computer’s serial interface to match the above setting. Refer to Figure 2-4 and Table
2-2 for RS232 connections. See PAR. 3.3.3.1 for a description of RS 232 implementation.
Upon power-up, the RS 232 port provides the following message:
KEPCO POWER SUPPLY CONTROLLER V.4.6;MBTG=6;PROGMODE=2
where
V4.6 indicates the software Version number
MBTG=6 indicates the first device is an MBT G Option with the GPIB address set to 6
PROGMODE=x is defined as follows:
x = 0 = CIIL
x = 1 = SCPI (secondary addressing enabled)
x = 2 = SCPI (standard)
x = 3 = SCPI (compability mode enabled)
3.3.3.1 RS 232 IMPLEMENTATION
The following paragraphs are provided to help the user understand how the RS 232 serial interface is implemented in the MBT-G option. 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 MBT power supply controller, thus avoiding a more complex
“handshake” protocol.
When the MBT-G power supply is in the RS 232 echo mode it returns all data sent to the host
controller. The MBT-G 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 MBT-G power supply. As shown in
Figure 3-3, there are times when the MBT-G power supply does not echo back the character
from the controller, requiring that the controller resend the character. By using the handshake
options (prompt and XON XOFF) the host controller can ensure that serial data interrupts occurring after parsing of the incoming message do not result in lost data.
Figure 3-3 illustrates the default echo mode, the prompt method and the XON XOFF method
described in the following paragraphs.
MBTSVC111609 3-53
FIGURE 3-3. RS 232 IMPLEMENTATION
Only four control characters (characters between 00H and 1FH) are acknowledged by the power
supply:
• Carriage Return (CR, 0D
• Line Feed (LF, 0A
• Back Space (BS, 08
• Escape (ESC, 01B
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 MBT-G
power supply by the command originator. When the line is parsed and the commands are sent
to the individual power supplies via the IEEE 1118 bus, the MBT-G power supply sends the line
terminator sequence CR LF to the command originator.
The ESC character is used for synchronization, causing the MBT-G to reset its input buffer and
return a CR LF sequence.
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 3-3).
3.3.3.2 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.
)
H
)
H
)
H
)
H
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 3-3).
3.3.3.3 PROMPT METHOD
The command originator sends a message line (command) to the MBT-G and waits until the
prompt sequence CR LF > (3E
, 6210) is received. The MBT-G sends the prompt sequence CR
H
LF > to the command originator indicating the power supply is ready to receive the next com-
3-54 MBTSVC111609
mand and 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 while the IEEE 1118 bus (BITBUS) is active. The operation of
the MBT-G is identical for echo mode and prompt mode; implementation of prompt mode is at
the command originator.
3.3.3.4 XON XOFF METHOD
The XON XOFF method allows the MBT-G 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
) has been received; the command originator stops sending data after receiving the
H
XOFF (transmission off) character (013
sending additional data. The XON XOFF method can be implemented independently of the
echo method using the special commands described below (PAR 3.3.3.5).
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 MBT-G returns the
normal sequence of CR LF (if echo mode is enabled).
3.3.3.5 SPECIAL COMMANDS
The serial parser supports the command RSMODE to allow quick changes to RS 232 protocol.
RSMODEn This command is used to implement the XON XOFF method and control whether
echo mode is on or off. The RSMODE sequence is followed by a number n: 0,
through 5, defined in Table 3-23. This command must be the first command on a
line.
), and waits until the XON character is received before
H
TABLE 3-23. XON XOFF CONTROL
VALUE OF n ECHO PROMPT XON XOFF
0 OFF OFF DISABLED
1 ON ON DISABLED
2 OFF ON DISABLED
3 OFF OFF ENABLED
4 ON ON ENABLED
5 OFF ON ENABLED
3.3.4 PROGRAMMING TECHNIQUES TO OPTIMIZE POWER SUPPLY PERFORMANCE
Kepco's auto-crossover digital supplies can operate in either voltage mode with current limit, or
current mode with voltage limit. The operating mode is determined by the voltage and current
commands received, as well as the load. Each time voltage and current commands are
received, the unit must evaluate the commands and the load conditions to determine the proper
operating mode. Reducing the number of times this evaluation must be made is desirable
because Kepco's digital auto-crossover supplies employ two separate feedback loops. Each
time there is a potential mode change, there is always an uncontrolled period of a few milliseconds while the two feedback loops compete for control of the output. By changing only the
active parameter (e.g., voltage for voltage mode), there is no doubt as to what the operating
mode will be, so the unit is never uncontrolled, response is quick and no transients are possible.
Recommended programming techniques are:
MBTSVC111609 3-55
1. Minimize programmed mode (voltage or current) changes. Unless absolutely required by the
test parameters, allow the power supply to automatically switch modes as determined by the
load. This will improve response time and reduce undesirable transients. For those power
supplies that employ relays (Kepco's MBT with "R" option, MAT and MST) this will also
increase the life of the relay.
2. Once the mode (voltage or current) is programmed, program the active parameter to zero
and the complementary limit parameter to the maximum anticipated for application. Then
program only the active parameter. The active parameter is the parameter that controls the
output, e.g., voltage controls the output in voltage mode.
3. Never program both the active and complementary limit parameter to zero. This can result in
long response times. Set the active parameter to zero and the complementary limit parameter to a minimum, e.g., 10% of maximum, to ensure that the active mode is defined.
3.3.5 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 MBT-G Power Supply as output strings within the selected programming
language (PASCAL, BASIC, etc.) in accordance with the manufacturer’s requirements for the
particular GPIB interface 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. 3.2.1.10 to
establish the MBT-G power supply GPIB address.)
3.3.5.1 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.
3.3.5.2 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 (see Table 3-24).
Refer also to syntax considerations (PAR.s 3.3.5.3 through 3.3.5.8).
3.3.5.3 SCPI SUBSYSTEM COMMAND/QUERY STRUCTURE
Subsystem commands/queries are related to specific power supply functions (such as setting
output voltage, current limit, etc.) Figure 3-4 is a tree diagram illustrating the structure of SCPI
subsystem commands used in MBT-G power supplies with the “root” at the left side, and specific
commands forming the branches. The subsystem commands are defined and explained in
Appendix B (see Table 3-24).
3-56 MBTSVC111609
TABLE 3-24. SCPI COMMAND INDEX
COMMAND
*CLS A.2 MEAS:VOLT? B.11 STAT:QUES:ENAB? B.31
*ESE A.3 OUTP:[STAT] B.12 STAT:QUES:INST? B.32
*ESE? A.4 OUTP:[STAT}? B.13 STAT:QUES:INST1? B.33
*ESR? A.5 [SOUR]:CURR B.14 STAT:QUES:INST2? B.34
*IDN? A.6 [SOUR]:CURR? B.15 STAT:QUES:INST:ENAB, ? B.35, B.36
*OPC, *OPC? A.7, [SOUR]:CURR:TRIG B.16 STAT:QUES:INST1:ENAB, ? B.37, B.38
OPT? A.9 [SOUR]:CURR:TRIG? B.17 STAT:QUES:INST2:ENAB, ? B.39, B.40
*RST A.10 [SOUR]:VOLT B.18 STAT:QUES:INST:ISUM? B.41
*SRE A.11 [SOUR]:VOLT? B.19 STAT:QUES:INST:ISUM:ENAB, ? B.42, B.43
*SRE? A.12 [SOUR]:VOLT:TRIG B.20 SYS:COMM:GPIB:ADDR B.44
*STB? A.13 [SOUR]:VOLT:TRIG? B.21 SYST:COMM:SER:BAUD B.45
*TRG A.14 [SOUR]:FUNC:MODE B.22 SYST:COMM:SER:ECHO B.46
*TST A.15 STAT:OPER:COND? B.23 SYST:COMM:SER:PACE B.47
*WAI A.16 STAT:OPER:ENAB B.24 SYST:COMM:SER:PROM B.48
INIT[:IMM] B.2 STAT:OPER:ENAB? B.25 SYST:ERR B.49
INIT:CONT B.3 STAT:OPER? B.26 SYST:ERR:CODE? B.50
INIT:CONT? B.4 STAT:PRES B.27 SYST:ERR:CODE:ALL? B.51
PAR.
REFERENCE
COMMAND
PAR .
REFERENCE
COMMAND
PAR .
REFERENCE
INST:CAT B.5 STAT:QUES? B.28 SYST:LANG B.52
INST, INST? B.6, B.7, B.8 STAT:QUES:COND? B.29 SYST:SET B.53
INST:STAT B.9 STAT:QUES:ENAB B.30 SYST:VERS? B.54
MEAS:CURR? B.10
MBTSVC111609 3-57
ROOT : (colon)
INITiate
[:IMMediate]
:CONTinuous
INSTrument
:CATalog
:NSELect
:SELect
:STATe
MEASure
[:SCALar]
:CURRent?
:VOLTage?
OUTPut
[:STATe]
[SOURce:]
VOLTage
[:LEVel]
[:IMMediate]
:TRIGgered
CURRent
[:LEVel]
[:IMMediate]
:TRIGgered
FUNCtion
:MODE
STATus
:OPERation
:CONDition?
:ENABle
[:EVENt]?
:PRESet
:QUEStionable
:CONDition?
:ENABle
[:EVENt]?
:INSTrument?
:ENB
:ISUM
:INSTrument1?
:ENB
:INSTrument2?
:ENB
SYSTem
:COMMunication
:GPIB:ADDRess
:SERial
:BAUD
:ECHO
:PACE
:PROM
:ERRor?
:CODE?
:ALL?
:LANGuage
:SET
:VERSion?
FIGURE 3-4. TREE DIAGRAM OF SCPI COMMANDS USED WITH MBT-G POWER SUPPLIES
3.3.5.4 PROGRAM MESSAGE STRUCTURE
SCPI program messages (commands from controller to power supply) consist of one or more
message units ending in a message terminator. The message terminator is not part of the syntax; it
is defined by the way your programming language indicates the end of a line (such as a “newline” or “end-of-line” 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-ofline>). The message unit may include a data parameter after the keyword separated 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 3-5 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.
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KEYWORD
ROOT SPECIFIER
MESSAGE UNIT SEPARATOR
DATA SEPARATOR
DATA
DATA SEPARATOR
KEYWORD
KEYWORD SEPARATOR
KEYWORD
3.3.5.4.1 KEYWORD
Keywords are instructions recognized by a decoder within the MBT-G Power Supply, referred to
as a “parser.” Each keyword describes a command function; all keywords used by the MBT-G
Power Supply are listed in Figure 3-4.
DATA
CURR:LEV 3.5;:OUTP ON;:CURR?<NL>
FIGURE 3-5. MESSAGE STRUCTURE
MESSAGE UNIT SEPARATOR
ROOT SPECIFIER
KEYWORD
QUERY INDICATOR
MESSAGE TERMINATOR
MESSAGE UNIT
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 3-25.
TABLE 3-25. RULES GOVERNING SHORTFORM KEYWORDS
IF NUMBER OF LETTERS IN
LONGFORM KEYWORD IS:
4 OR FEWER (DOES NOT MATTER) ALL LONG FORM LETTERS MODE
5 OR MORE NO
5 OR MORE YES
AND FOURTH LETTER
IS A VOWEL?
THEN SHORT FORM
CONSISTS OF:
THE FIRST FOUR
LONG FORM LETTERS
THE FIRST THREE
LONG FORM LETTERS
EXAMPLES
MEASure, OUTPut, EVENt
LEVel, IMMediate, ERRor
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.,
MBTSVC111609 3-59
IMMediate, EVENt, and OUTPut). The parser, however, is not sensitive to case (e.g., outp,
OutP, OUTPUt, ouTPut, or OUTp are all valid).
3.3.5.4.2 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 (PAR. 3.3.5.4.7).
3.3.5.4.3 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?).
3.3.5.4.4 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
3.3.5.4.5 DATA SEPARATOR
Data must be separated from the last keyword by a space (e.g., VOLT:LEV:TRIG 14 or
SOUR:VOLT? MAX
3.3.5.4.6 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).
3.3.5.4.7 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 3-4) 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.
3.3.5.4.8 MESSAGE TERMINATOR
The message terminator defines the end of a message. Three message terminators are permitted:
• new line (<NL>), ASCII 10 (decimal) or 0A (hex)
• (<CR>), ASCII 13 (decimal) or 0D (hex)
• both of the above (<CR> <NL>)
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Your GPIB interface card software will automatically send a message terminator. For example,
the HP BASIC OUTPUT statement inserts <NL> after the last data byte. When binary data is
exchanged, <END> must be used. The combination <NL><END> terminator can be used for all
data except binary data.
NOTE: Kepco power modules 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.
3.3.5.5 UNDERSTANDING THE COMMAND STRUCTURE
Understanding the command structure requires an understanding of the subsystem command
tree illustrated in Figure 3-4. 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 MBT-G power supply are
:INITiate, :MEASure, :OUTPut, [:SOURce], :STATus, and :SYSTem. 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.
3.3.5.6 ADDRESSING MULTIPLE POWER SUPPLIES
Power supplies on the IEEE 1118 bus are selected by node address, also referred to as node
number or channel number. Refer to the applicable manuals for the power modules connected
to the IEEE 1118 bus to set each power module to a unique node number, from 1 to 31 (a maximum of 27 power modules may be connected to the bus).
The node number may follow any part of a SCPI command. Note that there must be no space
preceding the node number
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e.g., meas2:volt? or meas:volt2? both measure output voltage of the power supply at node
number 2.
e.g., func3:mode volt or func:mode3 volt both set the power supply at node number 3 to
commanded voltage mode.
e.g., stat1:ques? or stat:ques1? or stat:ques:cond1? all read Questionable Register
status of the power supply at node number 1.
Upon power turn-on, commands sent without a node (channel) number will go to the default
node address (1) until another node number is specified. Once another node number is specified, the new number becomes the default until another is specified.
NOTE: An alternate means of selecting the node, is to use IEEE 488 secondary addressing,
where the secondary address is the power supply node address (refer to PAR. 2.9 to
enable this feature).
The node selected can also be changed using the INSTrument:SELect <N> command.
This allows subsequent commands to operate on the specified node (e.g. INST:SEL 10
causes node 10 to be selected).
3.3.5.7 UNDERSTANDING THE COMMAND STRUCTURE
Understanding the command structure requires an understanding of the subsystem command
tree illustrated in Figure 3-4. 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 MBT-G power supply controller are :INITiate, :MEASure, :OUTPut, [:SOURce], :STATus, and :SYSTem. 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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