KEPCO BHK-MG 200W User Manual
OPERATOR’S MANUAL
BHK-MG FULL RACK SERIES
VOLTAGE/CURRENT-STABILIZED DC SOURCE
KEPCO INC.
An ISO 9001 Company.
POWER SUPPLY
MODELS
BHK 300-0.6MG
BHK 500-0.4MG
BHK 1000-0.2MG
BHK 2000-0.1MG
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.
©2014, KEPCO, INC
P/N 243-1322f
KEPCO, INC. ! 131-38 SANFORD AVENUE ! FLUSHING, NY. 11355 U.S.A. ! TEL (718) 461-7000 ! FAX (718) 767-1102
email: hq@kepcopower.com ! World Wide Web: http://www.kepcopower.com
KEPCO®
THE POWER SUPPLIER™
Declaration of Conformity
Application of Council directives:
Standard to which Conformity is declared:
EN61010-1:2001 (Safety requirements for electrical equipment for measurement,
control and laboratory use - Part 1)
Manufacturer's Name and Address:
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
P
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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 022014 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. (EN61010-1:2001, Cl. 6, Cl. 7, Cl.8, and Cl. 9)
2. This power supply is designed for stationary installation, with mains power applied via a detachable
power supply cord or via direct wiring to the source power terminal block.
3. This power supply is considered a Class 1 (earthed) product. It is intended for use as part of equipment meant for test, measurement and laboratory use, and is designed to operate from single phase,
three wire power systems. This equipment must be installed within a suitably wired equipment rack,
utilizing a three wire (grounded) mains connection. See wiring section of this manual for complete
electrical wiring instructions. (EN61010-1:2001, Cl.6.10.1)
4. This power supply has secondary output circuits that are considered hazardous, and which exceed
240 VA at a potential of 2V or more.
5. The output wiring terminals of this power supply has not been evaluated for field wiring and, therefore,
must be properly configured by the end product manufacturer prior to use.
6. This power supply employs a supplementary circuit protector in the form of a circuit breaker mounted
on the front panel. This circuit breaker protects the power supply itself from damage in the event of a
fault condition. For complete circuit protection of the end product, as well as the building wiring, it is
required that a primary circuit protection device be fitted to the branch circuit wiring. (EN61010-1:2001,
Cl. 9.5)
7. Hazardous voltages are present within this power supply during normal operation. All operator adjustments to the product are made via externally accessible switches, controls and signal lines as specified within the product operating instructions. There are no user or operator serviceable parts within
the product enclosure. Refer all servicing to qualified and trained Kepco service technicians.
B 228-1351 COND/CONFORM 022014
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 set for the nominal a-c mains voltage indicated by the Voltage
Range Selector switch 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, follow the applicable instructions shown in this manual.
NOTE: Source power must be removed from the product prior to changing the setting of the Voltage Range Selector switch.
2. Grounding
This product is a Class 1 device which utilizes protective earthing to ensure operator safety.
The PROTECTIVE EARTHING CONDUCTOR TERMINAL must 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
!
228-1353 SAFETY - (SWITCH) 022014 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 .................................................................................................................................................. 1-8
1.4.1 Local Control...................................................................................................................................... 1-8
1.4.2 Remote Control.................................................................................................................................. 1-8
1.4.2.1 Digital Programming .................................................................................................................... 1-8
1.4.2.2 Analog Programming ................................................................................................................... 1-8
1.4.2.3 Analog Readback......................................................................................................................... 1-8
1.4.3 Digital Calibration............................................................................................................................... 1-8
1.4.4 Overvoltage/Overcurrent Protection .................................................................................................. 1-9
1.4.5 User-defined Voltage/Current Limits.................................................................................................. 1-9
1.4.6 Nonvolatile Storage of Programmed Sequences or Active Settings.................................................. 1-9
1.4.7 Current Scale..................................................................................................................................... 1-9
1.4.8 Fast Mode/Slow Mode Selection ....................................................................................................... 1-9
1.4.9 External Trigger Port.......................................................................................................................... 1-10
1.4.10 Built-in Protection............................................................................................................................... 1-10
1.4.11 Current Sink Capability...................................................................................................................... 1-11
1.4.12 Analog Readback and Flag Signals Available for Customer Use...................................................... 1-12
1.5 Equipment Supplied ................................................................................................................................ 1-12
1.6 Accessories ............................................................................................................................................. 1-13
1.7 Safety ...................................................................................................................................................... 1-13
SECTION 2 - INSTALLATION
2.1 Unpacking and Inspection ....................................................................................................................... 2-1
2.2 Terminations and Controls ...................................................................................................................... 2-1
2.3 Source Power Requirements .................................................................................................................. 2-6
2.4 Cooling .................................................................................................................................................... 2-6
2.5 Preliminary Operational Check................................................................................................................ 2-6
2.6 Installation ............................................................................................................................................... 2-8
2.6.1 Bench Top Use.................................................................................................................................. 2-8
2.6.2 Rack Mounting................................................................................................................................... 2-8
2.7 Wiring Instructions................................................................................................................................... 2-8
2.7.1 Safety Grounding............................................................................................................................... 2-8
2.7.2 Source Power Connections ............................................................................................................... 2-9
2.7.3 D-C Output Grounding....................................................................................................................... 2-9
2.7.4 Power Supply/Load Interface............................................................................................................. 2-9
2.7.4.1 Cable Recommendations............................................................................................................. 2-10
2.7.5 Load Connection - General................................................................................................................ 2-10
2.7.5.1 Local Sensing/Remote Sensing Select........................................................................................ 2-11
2.7.5.2 Fast Mode/Slow Mode Select ...................................................................................................... 2-11
2.7.5.3 Grounding Network Configuration................................................................................................ 2-11
2.7.5.4 Positive Output, Negative Terminal Grounded ............................................................................ 2-11
2.7.5.5 Negative Output, Positive Terminal Grounded ............................................................................ 2-12
2.8 Operating Configuration .......................................................................................................................... 2-13
2.9 Status Port............................................................................................................................................... 2-13
SECTION 3 - OPERATION
3.1 General.................................................................................................................................................... 3-1
3.2 Local Mode Operation ............................................................................................................................. 3-1
3.2.1 Front Panel Keypad and LCD............................................................................................................ 3-1
3.2.1.1 Command Entry Status................................................................................................................ 3-1
3.2.1.2 Data Entry Status......................................................................................................................... 3-1
3.2.1.3 Display (LCD)............................................................................................................................... 3-1
3.2.1.4 Keypad Functions ........................................................................................................................ 3-2
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3.2.2 Turning the Power Supply On........................................................................................................... 3-4
3.2.3 Error Conditions ................................................................................................................................ 3-5
3.2.4 Setting Local Mode ........................................................................................................................... 3-5
3.2.5 Adjusting LCD Contrast .................................................................................................................... 3-6
3.2.6 Enabling/Disabling Audible Beeps .................................................................................................... 3-6
3.2.7 Enabling/Disabling DC Output Power ............................................................................................... 3-6
3.2.7.1 Disabling DC Output when using Digital Inputs only (keypad and/or GPIB) ............................... 3-6
3.2.7.2 Disabling DC Output when using Analog control. ....................................................................... 3-6
3.2.7.3 Remote Shutdown using External Trigger Port ........................................................................... 3-7
3.2.7.4 Power Up DC Output Control...................................................................................................... 3-7
3.2.8 Reset Operation................................................................................................................................ 3-7
3.2.8.1 Setting Power-Up & Reset Current ............................................................................................. 3-7
3.2.9 Setting Output Voltage or Current..................................................................................................... 3-8
3.2.10 Changing Current Scale.................................................................................................................... 3-8
3.2.11 Setting Overvoltage or Overcurrent Protection ................................................................................. 3-9
3.2.12 Changing Maximum Voltage or Current Value ................................................................................. 3-10
3.2.13 Storing Power Supply Output Settings.............................................................................................. 3-10
3.2.14 Recalling Stored Output Settings...................................................................................................... 3-11
3.2.15 Firmware Version.............................................................................................................................. 3-11
3.2.16 Local Mode Programming of the Power Supply................................................................................ 3-11
3.2.16.1 Creating or Modifying a Program (Program Edit Mode).............................................................. 3-11
3.2.16.1.1 Modifying Programmed Time Interval..................................................................................... 3-12
3.2.16.1.2 Time Interval Accuracy........................................................................................................... 3-12
3.2.16.2 Running a Program ..................................................................................................................... 3-12
3.2.16.3 Stepping Through a Program...................................................................................................... 3-12
3.2.16.4 Cycling a Program....................................................................................................................... 3-14
3.2.16.5 Running a Program Once ........................................................................................................... 3-14
3.2.16.6 Stopping a Running Program...................................................................................................... 3-14
3.2.16.7 Sample Program ......................................................................................................................... 3-14
3.2.17 Calibration......................................................................................................................................... 3-15
3.3 Remote Mode Programming Using SCPI commands via IEEE 488 (GPIB). Bus .................................. 3-15
3.3.1 IEEE 488 (GPIB) Bus Protocol ......................................................................................................... 3-15
3.3.2 DCL Control ...................................................................................................................................... 3-17
3.3.3 Changing the GPIB Address............................................................................................................. 3-17
3.3.4 External Trigger ................................................................................................................................ 3-17
3.3.5 BHK-MG VISA Instrument driver ...................................................................................................... 3-18
3.3.6 Programming Techniques to Optimize performance ........................................................................ 3-18
3.3.6.1 Programming Voltage/Current Limit and Current/Voltage Limit .................................................. 3-18
3.3.6.2 Making Sure the Previous Command is Complete ..................................................................... 3-19
3.4 RS232-C Operation ................................................................................................................................ 3-20
3.4.1 Setting RS 232 Baud Rate................................................................................................................ 3-21
3.4.2 Serial Interface.................................................................................................................................. 3-21
3.4.3 RS 232 Implementation .................................................................................................................... 3-21
3.4.3.1 Echo Mode .................................................................................................................................. 3-22
3.4.3.2 Prompt Method............................................................................................................................ 3-22
3.4.3.3 XON XOFF Method..................................................................................................................... 3-22
3.4.4 Isolating RS 232 Communication Problems ..................................................................................... 3-23
3.5 SCPI Programming................................................................................................................................. 3-23
3.5.1 SCPI Messages ................................................................................................................................ 3-23
3.5.2 Common Commands/Queries .......................................................................................................... 3-24
3.5.3 SCPI Subsystem Command/Query Structure................................................................................... 3-24
3.5.3.1 ABORt Subsystem ...................................................................................................................... 3-24
3.5.3.2 INITiate Subsystem..................................................................................................................... 3-24
3.5.3.3 LIST Subsystem.......................................................................................................................... 3-24
3.5.3.4 MEASure Subsystem .................................................................................................................. 3-24
3.5.3.5 OUTPut Subsystem .................................................................................................................... 3-24
3.5.3.6 Instrument Subsystem ................................................................................................................ 3-24
ii BHK 500-0.4MG SVC 022014
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3.5.3.7 STATus Subsystem ..................................................................................................................... 3-25
3.5.3.8 System Subsystem ...................................................................................................................... 3-25
3.5.3.9 TRIGger subsystem..................................................................................................................... 3-25
3.5.3.10 [SOURce:]VOLTage and [SOURce:]CURRent Subsystems ....................................................... 3-25
3.5.3.11 CALibrate Subsystem .................................................................................................................. 3-25
3.5.4 Program Message Structure.............................................................................................................. 3-25
3.5.4.1 Keyword....................................................................................................................................... 3-26
3.5.4.2 Keyword Separator ...................................................................................................................... 3-26
3.5.4.3 Query Indicator ............................................................................................................................ 3-26
3.5.4.4 Data ............................................................................................................................................. 3-27
3.5.4.5 Data Separator............................................................................................................................. 3-27
3.5.4.6 Message Unit Separator .............................................................................................................. 3-27
3.5.4.7 Root Specifier .............................................................................................................................. 3-29
3.5.4.8 Message Terminator.................................................................................................................... 3-29
3.5.5 Understanding The Command Structure ........................................................................................... 3-29
3.5.6 Program Message Syntax Summary................................................................................................. 3-30
3.5.7 SCPI Program Examples................................................................................................................... 3-30
3.6 Remote Programming Using Analog Programming Terminals................................................................ 3-31
3.6.1 Analog Programming Warnings and Cautions................................................................................... 3-33
3.6.2 Programming with external resistance............................................................................................... 3-35
3.6.2.1 Voltage Mode............................................................................................................................... 3-37
3.6.2.2 Current Mode............................................................................................................................... 3-37
3.6.3 Programming with external voltage using a low impedance Voltage source..................................... 3-38
3.6.3.1 Voltage Mode............................................................................................................................... 3-42
3.6.3.2 Current Mode............................................................................................................................... 3-43
3.6.4 Programming with external voltage using a high impedance, low level (1V) Voltage source ............ 3-43
3.6.4.1 Voltage Mode............................................................................................................................... 3-46
3.6.4.2 Current Mode............................................................................................................................... 3-46
3.6.5 Programming with external current source (1 mA) ............................................................................ 3-47
3.6.5.1 Voltage Mode............................................................................................................................... 3-49
3.6.5.2 Current Mode............................................................................................................................... 3-49
3.7 Operating Modes..................................................................................................................................... 3-50
3.7.1 Slow/Fast mode of operation ............................................................................................................. 3-50
3.7.2 Series operation................................................................................................................................. 3-52
3.7.2.1 Automatic series operation .......................................................................................................... 3-53
3.7.2.2 Master-slave series operation (Automatic Tracking).................................................................... 3-56
3.7.2.2.1 Voltage Mode Operation .........................................................................................................3-56
3.7.2.2.2 Current Mode Operation .........................................................................................................3-59
3.7.3 Parallel operation............................................................................................................................... 3-61
3.7.3.1 Automatic parallel operation ........................................................................................................ 3-62
3.7.3.2 Master-slave parallel operation.................................................................................................... 3-64
3.7.3.2.1 Voltage Mode Operation .........................................................................................................3-65
3.7.3.2.2 Current Mode Operation .........................................................................................................3-67
SECTION 4 - CALIBRATION
4.1 General.................................................................................................................................................... 4-1
4.2 Equipment Required................................................................................................................................ 4-1
4.3 Calibration Procedures Using Front Panel Keypad ................................................................................. 4-1
4.3.1 Voltage Calibration ............................................................................................................................ 4-2
4.3.2 High Current Calibration .................................................................................................................... 4-3
4.3.3 Low Current Calibration..................................................................................................................... 4-4
4.4 Calibration Using VISA Driver ................................................................................................................. 4-5
4.4.1 GPIB Setup........................................................................................................................................ 4-5
4.4.2 Calibration Basics .............................................................................................................................. 4-5
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4.4.3 Calibration Procedure ....................................................................................................................... 4-7
4.5 Changing the Calibration Password ....................................................................................................... 4-9
4.6 Restoring Previous Calibration Values ................................................................................................... 4-10
4.7 Restoring Factory Calibration Values ..................................................................................................... 4-10
4.8 Calibration Storage ................................................................................................................................. 4-10
APPENDIX A - IEEE 488.2 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-1
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-2
A.9 *RCL — Recall Command ...................................................................................................................... A-2
A.10 *RST — Reset Command....................................................................................................................... A-3
A.11 * SAV — Save Command....................................................................................................................... A-3
A.12 *SRE — Service Request Enable Command ......................................................................................... A-4
A.13 *SRE? — Service Request Enable Query .............................................................................................. A-4
A.14 *STB? — Status Byte Register Query .................................................................................................... A-4
A.15 *TRG — Trigger Command .................................................................................................................... A-4
A.16 *TST? — Self Test Query....................................................................................................................... A-4
APPENDIX B - SCPI COMMAND/QUERY DEFINITIONS
B-1 Introduction............................................................................................................................................. B-1
B.2 Numerical Values.................................................................................................................................... B-2
B.3 ABORt Command ................................................................................................................................... B-2
B.4 CAL Commands and Queries................................................................................................................. B-2
B.5 DISPlay:CONTrast Command ................................................................................................................ B-2
B.6 DISPlay:CONTrast? Query..................................................................................................................... B-2
B.7 DISPlay:MODE Command ..................................................................................................................... B-4
B.8 DISPlay:MODE? Query .......................................................................................................................... B-4
B.9 DISPlay:TEXT Command ....................................................................................................................... B-4
B.10 DISPlay:TEXT? Query............................................................................................................................ B-4
B.11 INITiate[:IMMediate] Command.............................................................................................................. B-4
B.12 INITiate:CONTinuous Command............................................................................................................ B-4
B.13 INITiate:CONTinuous? Query................................................................................................................. B-4
B.14 INSTrument:STATe Command............................................................................................................... B-5
B.15 INSTrument:STATe? Query ................................................................................................................... B-5
B.16 [SOURce:]LIST:CLEar Command .......................................................................................................... B-5
B.17 [SOURce:]LIST:COUNt Command......................................................................................................... B-5
B.18 [SOURce:]LIST:COUNt? Query.............................................................................................................. B-5
B.19 [SOURce:]LIST:COUNt:SKIP Command................................................................................................ B-5
B.20 [SOURce:]LIST:COUNt:SKIP? Query .................................................................................................... B-5
B.21 [SOURce:]LIST:CURRent Command ..................................................................................................... B-5
B.22 [SOURce:]LIST:CURRent? Query.......................................................................................................... B-6
B.23 [SOURce:]LIST:CURRent:POINts? Query ............................................................................................. B-6
B.24 [SOURce:]LIST:DIRection Command..................................................................................................... B-6
B.25 [SOURce:]LIST:DIRection? Query ......................................................................................................... B-6
B.26 [SOURce:]LIST:DWELl Command ......................................................................................................... B-6
B.27 [SOURce:]LIST:DWELl? Query.............................................................................................................. B-6
B.28 [SOURce:]LIST:DWELl:POINts? Query ................................................................................................. B-6
B.29 [SOURce:]LIST:QUERy Command ........................................................................................................ B-7
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B.30 [SOURce:]LIST:QUERy? Query............................................................................................................. B-7
B.31 [SOURce:]LIST:VOLTage Command..................................................................................................... B-7
B.32 [SOURce:]LIST:VOLTage? Query ......................................................................................................... B-7
B.33 [SOURce:]LIST:VOLTage:POINts? Query............................................................................................. B-7
B.34 MEASure[:SCALar]:CURRent[:DC]? Query ........................................................................................... B-9
B.35 MEASure:VOLTage[:SCALar][:DC]? Query ........................................................................................... B-9
B.36 OUTPut[:STATe] Command................................................................................................................... B-9
B.37 OUTPut[:STATe]? Query ....................................................................................................................... B-9
B.38 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude] Command.......................................................... B-10
B.39 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude]? Query .............................................................. B-10
B.40 [SOURce:]CURRent:LIMit[:HIGH] Command......................................................................................... B-10
B.41 [SOURce:]CURRent:LIMit[:HIGH]? Query ............................................................................................. B-10
B.42 [SOURce:]CURRent:MODE Command.................................................................................................. B-10
B.43 [SOURce:]CURRent:MODE? Query ...................................................................................................... B-11
B.44 [SOURce:]CURRent:PROTection[:LEVel] Command ............................................................................ B-11
B.45 [SOURce:]CURRent:PROTection[:LEVel]? Query ................................................................................. B-11
B.46 [SOURce:]CURRent:RANGe Command ................................................................................................ B-11
B.47 [SOURce:]CURRent:RANGe? Query..................................................................................................... B-11
B.48 [SOURce:]CURRent[:LEVel]:TRIGgered[:AMPlitude] Command........................................................... B-11
B.49 [SOURce:]CURRent[:LEVel]:TRIGgered[:AMPlitude]? Query ............................................................... B-12
B.50 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude] Command.......................................................... B-12
B.51 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude]? Query .............................................................. B-12
B.52 [SOURce:]VOLTage:LIMit[:HIGH] Command......................................................................................... B-12
B.53 [SOURce:]VOLTage:LIMit[:HIGH]? Query ............................................................................................. B-13
B.54 [SOURce:]VOLTage:MODE Command.................................................................................................. B-13
B.55 [SOURce:]VOLTage:MODE? Query ...................................................................................................... B-13
B.56 [SOURce:]VOLTage:PROTection[:LEVel] Command............................................................................ B-13
B.57 [SOURce:]VOLTage:PROTection[:LEVel]? Query................................................................................. B-13
B.58 [SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPlitude] Command........................................................... B-13
B.59 [SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPlitude]? Query ............................................................... B-14
B.60 [SOURce:]FUNCtion:MODE? Query ...................................................................................................... B-14
B.61 STATus:OPERation:CONDition? Query................................................................................................. B-14
B.62 STATus:OPERation:ENABle Command ................................................................................................ B-15
B.63 STATus:OPERation:ENABle? Query ..................................................................................................... B-15
B.64 STATus:OPERation[:EVENt]? Query..................................................................................................... B-15
B.65 STATus:PRESet Command ................................................................................................................... B-16
B.66 STATus:QUEStionable[:EVENt]? Query ................................................................................................ B-16
B.67 STATus:QUEStionable:CONDition? Query............................................................................................ B-16
B.68 STATus:QUEStionable:ENABle Command............................................................................................ B-16
B.69 STATus:QUEStionable:ENABle? Query ................................................................................................ B-16
B.70 SYSTem:BEEP Command..................................................................................................................... B-17
B.71 SYSTem:COMMunication:GPIB:ADDRess
B.72 SYSTem:COMMunication:GPIB:ADDRess? Query ............................................................................... B-17
B.73 SYSTem:COMMunication:SERial:BAUD Command.............................................................................. B-17
B.74 SYSTem:COMMunication:SERial:BAUD? Query................................................................................... B-17
B.75 SYSTem:COMMunication:SERial:ECHO Command ............................................................................. B-17
B.76 SYSTem:COMMunication:SERial:ECHO? Query .................................................................................. B-17
B.77 SYSTem:COMMunication:SERial:PACE Command.............................................................................. B-17
B.78 SYSTem:COMMunication:SERial:PACE? Query................................................................................... B-18
B.79 SYSTem:COMMunication:SERial:PROMpt CommanD ......................................................................... B-18
B.80 SYSTem:COMMunication:SERial:PROMpt? Query............................................................................... B-18
B.81 SYSTem:ERRor? Query ........................................................................................................................ B-18
B.82 SYSTem:ERRor:CODE? Query ............................................................................................................. B-18
Command......................................................................... B-17
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B.83 SYSTem:ERRor:CODE:ALL? Query ...................................................................................................... B-18
B.84 SYSTem:KLOCk Command ................................................................................................................... B-19
B.85 SYSTem:KLOCk? Query ........................................................................................................................ B-19
B.86 SYSTem:PASSword:CENable Command .............................................................................................. B-19
B.87 SYSTem:PASSword:CDISable Command............................................................................................. B-19
B.88 SYSTem:PASSword:NEW Command .................................................................................................... B-19
B.89 SYSTem:PASSword:STATe? Query ...................................................................................................... B-19
B.90 SYSTem:SECurity:IMMediate Command............................................................................................... B-20
B.91 SYSTem:VERSion? Query ..................................................................................................................... B-20
B.92 TRIGger:SOURce Command ................................................................................................................. B-20
vi BHK 500-0.4MG SVC 022014
LIST OF FIGURES
FIGURE TITLE PAGE
1-1 BHK-MG Series Programmable Power Supply.............................................................................................. x
1-2 BHK Series Power Supply, Mechanical Outline Drawing............................................................................ 1-6
2-1 BHK-MG Series, Front Panel Controls, Indicators and Connectors............................................................ 2-1
2-2 BHK-MG Series, Rear Panel Controls and Connections ............................................................................ 2-3
2-3 LCD Power On Defaults.............................................................................................................................. 2-7
2-4 Local Sensing, Slow Mode Selected, Grounding Network Connected,
Floating Output (Factory Default Configuration)....................................................................................... 2-12
2-5 Remote Sensing, Fast Mode Selected, Positive Output Grounded ............................................................ 2-12
2-6 Status Port Opto-coupler Active “High” Configuration................................................................................. 2-13
2-7 Status Port Opto-coupler Active “Low” Configuration ................................................................................. 2-13
3-1 LCD Power On Defaults.............................................................................................................................. 3-5
3-2 Programming Example to Verify Previous Command has Completed........................................................ 3-20
3-3 RS 232 Implementation .............................................................................................................................. 3-22
3-4 Message Structure...................................................................................................................................... 3-27
3-5 Tree Diagram of SCPI Commands Used with BHK-MG Power Supply...................................................... 3-28
3-6 Typical Example Of BHK-MG Power Supply Program Using SCPI Commands......................................... 3-31
3-7 Analog Voltage Programming, Simplified Diagram ..................................................................................... 3-32
3-8 Analog Current Programming, Simplified Diagram ..................................................................................... 3-32
3-9 Analog Programming of Output Voltage (Voltage Mode)
or Voltage Limit (Current Mode) using Resistance.................................................................................. 3-35
3-10 Analog Programming of Output Current (Current Mode)
or Current Limit (Voltage Mode) using Resistance.................................................................................. 3-36
3-11 Analog Programming of Output Voltage (Voltage Mode) or Voltage Limit
(Current Mode) using Isolated (floating) Low Impedance Voltage Source (VS)...................................... 3-38
3-12 Analog Programming of Output Voltage (Voltage Mode) or Voltage
Limit (Current Mode) using Grounded Low Impedance Voltage Source (VS)......................................... 3-39
3-13 Analog Programming of Output Current (Current Mode) or Current Limit
(Voltage Mode) using Isolated (Floating) Low Impedance Voltage Source (VS) .................................... 3-40
3-14 Analog Programming of Output Current (Current Mode) or Current
Limit (Voltage Mode) using Grounded Low Impedance Voltage Source (VS) ........................................ 3-41
3-15 Analog Programming of Output Voltage (Voltage Mode) or Voltage
Limit (Current Mode) using High Impedance, Low Level (1V) Voltage Source (VS)............................... 3-44
3-16 Analog Programming of Output Current (Current Mode) or Current
Limit (Voltage Mode) using High Impedance, Low Level (1V) Voltage Source (VS)............................... 3-45
3-17 Analog Programming of Output Voltage (Voltage Mode) or Voltage
Limit (Current Mode) using Current Source (1mA) (CS)......................................................................... 3-47
3-18 Analog Programming of Output Current (Current Mode) or Current
Limit (Voltage Mode) using Current Source (1mA) (CS) ......................................................................... 3-48
3-19 Slow Mode/Fast Mode Operation ............................................................................................................... 3-51
3-20 Series Automatic Configuration .................................................................................................................. 3-55
3-21 Series Master-Slave (Voltage Mode) Configuration.................................................................................... 3-58
3-22 Series Master-Slave (Current Mode) Configuration .................................................................................... 3-59
3-23 Parallel Automatic Configuration................................................................................................................. 3-63
3-24 Parallel Master-Slave (Voltage Mode) Configuration .................................................................................. 3-65
3-25 Parallel Master-Slave (Current Mode) Configuration .................................................................................. 3-68
4-1 GPIB Setup Window ................................................................................................................................... 4-5
4-2 Main Panel (BHK 500-0.4MG, Typical) ....................................................................................................... 4-6
4-3 Calibration Panel......................................................................................................................................... 4-6
A-1 GPIB Commands ....................................................................................................................................... A-3
B-1 Programming the Output............................................................................................................................ B-3
B-2 Using Display Commands.......................................................................................................................... B-3
B-3 Using LIST Commands and Queries ......................................................................................................... B-8
B-4 Programming Current ................................................................................................................................ B-12
B-5 Programming Voltage ................................................................................................................................ B-14
B-6 Using Status Commands and Queries....................................................................................................... B-15
B-7 Using System Commands and Queries..................................................................................................... B-19
BHK 500-0.4MG SVC 022014
vii
LIST OF TABLES
TABLE TITLE PAGE
1-1 Model Parameters ...................................................................................................................................... 1-2
1-2 BHK-MG 200W Specifications ................................................................................................................... 1-2
1-3 Connector A2J5 Signal Descriptions .......................................................................................................... 1-12
1-4 Equipment Supplied ................................................................................................................................... 1-12
1-5 Accessories ................................................................................................................................................ 1-13
1-6 Safety Symbols .......................................................................................................................................... 1-13
2-1 Controls, Indicators, and Connectors ......................................................................................................... 2-2
2-2 Trigger Port Pin Assignments ..................................................................................................................... 2-2
2-3 RS232C Port Input/Output Pin Assignments .............................................................................................. 2-3
2-4 Status Port Connector Pin Assignments .................................................................................................... 2-4
2-5 IEEE 488 Port Connector Pin Assignments ............................................................................................... 2-4
2-7 Voltage Programming Terminal Strip TB2, Terminal Assignments ............................................................ 2-5
2-8 Current Programming Terminal Strip TB3, Terminal Assignments ............................................................ 2-5
2-6 Rear Output Terminal Strip TB1 Terminal Assignments ............................................................................ 2-5
2-9 Internal Jumper Configuration .................................................................................................................... 2-13
3-1 LCD Messages ........................................................................................................................................... 3-2
3-2 Key Functions ............................................................................................................................................. 3-2
3-3 Error Conditions ......................................................................................................................................... 3-5
3-4 Memory Location Worksheet ...................................................................................................................... 3-13
3-5 Sample Program (Model BHK-MG 500-0.4MG) ......................................................................................... 3-15
3-6 IEEE 488 (GPIB) Bus Interface Functions ................................................................................................. 3-15
3-7 IEEE 488 (GPIB) Bus Command Mode Messages .................................................................................... 3-16
3-8 IEEE 488 (GPIB) Bus Data Mode Messages ............................................................................................. 3-17
3-9 Rules Governing Shortform Keywords ....................................................................................................... 3-26
3-10 Feedback Resistor and Current Sensing Resistor Values ......................................................................... 3-36
4-1 Calibration Panel Functions ....................................................................................................................... 4-7
4-2 Factory Default Calibration Passwords ...................................................................................................... 4-9
4-3 Calibration Storage ..................................................................................................................................... 4-11
A-1 IEEE 488.2 Command/query Index ............................................................................................................A-1
A-2 Standard Event Status Enable Register and Standard Event Status Register Bits ...................................A-1
A-3 Service Request Enable and Status Byte Register Bits .............................................................................A-4
B-1 SCPI Subsystem Command/query Index ...................................................................................................B-1
B-2 Operation Condition Register, Operation Enable Register,
and Operation Event Register Bits ..........................................................................................................B-14
B-3 Questionable Event Register, Questionable Condition Register
and Questionable Condition Enable Register Bits ...................................................................................B-16
B-4 Error Messages ..........................................................................................................................................B-20
viii BHK 500-0.4MG SVC 022014
SERVICE
SAFETY INSTRUCTIONS
Read these safety instructions, as well as the applicable installation, operating and servicing instructions
contained in this manual before using the power supply.
WARNING
Do not touch the output terminals. The high voltage output is dangerous. Electric shock can cause injury or
death.
Do not remove the cover or disassemble the unit. There are no operator serviceable components or
adjustments inside the unit. High voltage components inside the unit can cause serious injury even with
input power disconnected.
CAUTION
If this power supply is used in OEM equipment, the OEM equipment manufacturer is responsible for
attaching appropriate warning labels on the OEM equipment.
Operating the power supply outside the specified limits for input voltage, temperature, or other environmental conditions noted in this manual can damage the power supply and void the warranty.
Safety Messages
The BHK-MG can be controlled by digital and/or analog inputs. When OUTPUT is set to off from the keypad or the GPIB, an analog input will still produce an output from the BHK-MG which will be indicated on
the LCD. If the output is greater than 8 Volts and the current is higher than 2 LSB’s, a shutdown sequence
begins: the unit will beep, the LCD will flash DIGITAL IS OFF and SET ANALOG OFF, and the unit will shut
down within 25 seconds unless the analog input is turned off. The beeping and controlled shutdown function can be overridden by a jumper option (see Table 2-9.)
There are no operator serviceable parts inside the case. Service must be referred to authorized personnel.
Using the power supply in a manner not specified by Kepco. Inc. may impair the protection provided by the
power supply. Observe all safety precautions noted throughout this manual. The following table lists symbols used on the power supply or in this manual where applicable.
SAFETY SYMBOLS
SYMBOL Meaning SYMBOL Meaning
WARNING: RISK OF ELECTRIC
SHOCK. WARNING
CAUTION: REFER TO REFER-
!
ENCED PROCEDURE. CAUTION
INDICATES THE POSSIBILITY
OF BODILY INJURY OR DEATH.
INDICATES THE POSSIBILITY
OF EQUIPMENT DAMAGE.
BHK-MG 022014 ix
FIGURE 1-1. BHK-MG SERIES PROGRAMMABLE POWER SUPPLY
x BHK-MG022014
1.1 SCOPE OF MANUAL
This manual contains instructions for the installation and operation of the BHK-MG series of
200W output power stabilized voltage or current, d-c power supplies manufactured by KEPCO,
Inc., Flushing, New York, U.S.A.
DANGEROUS AND LETHAL POTENTIALS ARE PRESENT,
BOTH WITHIN THIS POWER SUPPLY, AND AT THE OUTPUT!
Before proceeding to use the power supply, read this manual very carefully. Caution must be used when working with, and making connections
to, this power supply. Use only wires with the proper voltage rating for
high voltage connections. Use the designated plugs for the front panel
output. Be extremely careful when analog programming inputs are used,
especially with the negative output of the power supply grounded.
Unless otherwise specified, always connect the test and measuring
equipment to the input power source using an isolating transformer having a suitable isolating voltage rating. Follow all instructions regarding the
grounding of the test set-up. Refer all servicing to qualified service personnel only.
SECTION 1 - INTRODUCTION
WARNING
1.2 GENERAL DESCRIPTION
The BHK-MG Power Supply Series (Figure 1-1) are full-range, automatic crossover, linear voltage/current stabilizers with a full rectangular output characteristic. Four single-output models
are available, each of which have two output current ranges as listed in Table1-1.
Although designed as a stand-alone bench top unit, the full-rack cross section permits mounting
in a standard 19-inch wide rack (see Table1-5). Connections can be made at both rear output
terminals (recommended for rack mounted configurations) and front output terminals (recommended for bench applications). Sensing output terminals are available at the rear terminals
only. These power supplies operate from either 115V or 230V a-c (nominal - switch selectable),
50 or 60 Hz (nominal) input source power. Since there are no internal adjustments, BHK-MG
Power Supplies offer excellent output voltage/current stability and easy calibration.
Output voltage and current are displayed on an alphanumeric Liquid Crystal Display (LCD).
Control of the BHK-MG can be either local, via the front panel keypad and display, or remote using either analog signals (applied to Analog Programming Terminals), or digital programming
via either the IEEE 488.2 (GPIB) or RS 232 communication bus using SCPI commands. Both
digital control (either local or remote) and analog control can be used simultaneously. Digital
control is done with 12 bits of resolution over the entire voltage/current range.
1.3 SPECIFICATIONS
Table 1-1 lists the parameters applicable to individual models. Table 1-2 lists general specifications applicable to all models except where otherwise noted.
BHK-MG (OPR) 022014 1-1
TABLE 1-1. MODEL PARAMETERS
OUTPUT
MODEL
NUMBER
BHK 300-0.6MG 0 - 300
BHK 500-0.4MG 0 - 500
BHK 1000-0.2MG 0 - 1000
BHK 2000-0.1MG 0 - 2000
VOLTAGE
RANGE
(VOLTS)
OUTPUT
CURRENT
RANGE
(mA)
0 - 600 180
0 - 60 18 33.3 0.008
0 - 400 200
0 - 40 20 83 0.007
0 - 200 200
0 - 20 20 333 0.003
0 - 100 200
0 - 10 20 1333 0.001
MAXIMUM
OUTPUT
POWER
(WATTS)
OUTPUT EQUIVALENT IMPEDANCE (FAST MODE)
VO LTA GE M O DE
(SERIES R–L)
R
(Ohms)
d-c
0.025 2.0
0.0625 3.6
0.25 6.0
1.0 35
L (mH)
CURRENT MODE
(PARALLEL R–C)
R
(MOhms)
d-c
3.33 0.013
8.3 0.012
33 0.005
133 0.002
C (µF)
TABLE 1-2. BHK-MG 200W SPECIFICATIONS
SPECIFICATION RATING/DESCRIPTION CONDITION
INPUT CHARACTERISTICS
a-c Voltage nominal (switch selectable) 115/230V a-c Single phase
range (switch selectable) 105-125/210-250V a-c
Frequency nominal 50-60Hz
range 47-63Hz
Current 115V a-c 4.0A a-c 200W at output
230V a-c 2.1A a-c
OUTPUT CHARACTERISTICS
NOTE: Current specifications contained in this table refer to source current (delivered by the unit to the load). Sink current (absorbed
by the unit from the load) occurs when the output voltage is programmed to a lower value. The sink current is constant, from
45% to 55% of High Current scale rating; it flows until the output reaches the lower voltage.
Type of Stabilizer Linear with automatic
Adjustment range
(Adjustment is either continuous using analog programming, or stepped using digital
programming)
Digital Programming
resolution
Digital Programming accuracy Voltage 0.025% of rating
Digital Data Readback
accuracy
Source effect Voltage 0.001% E
Load effect Voltage 0.005% E
Voltage and Current 0.025% of rating Current measurement requires calibrated
Voltage 0 to 100% of rating See PAR. 1.4.2.2 and 1.4.2.3 for details
Current 0-100% of rating,
Current 0.05% of rating Both current scales
Voltage 0.05% of rating
Current 0.05% of rating Both current scales, 10-100% of rating
Current 0.002% I
Current 0.015% I
crossover
or 0-10% of rating
0.005% of rating Both current scales, <10% of rating (auto-
max Input voltage
O
max
O
max no load - full load
O
max short - full load
O
Voltage/Current
about analog programming and readback.
Use Menu program to change current
scale (See PAR 3.2.10)
shunt (see PAR. 4.2)
matic 10X magnifier)
105-125/210-250V a-c
1-2 BHK-MG (OPR) 022014
TABLE 1-2. BHK-MG 200W SPECIFICATIONS (Continued)
SPECIFICATION RATING/DESCRIPTION CONDITION
OUTPUT CHARACTERISTICS (CONTINUED)
Temperature effect
(per degree C)
Time effect Voltage 0.01% E
Ripple
Voltage: Fast Mode
(rms/p-p)
Fast Mode = internal output
Current: Fast Mode
capacitor not connected.
Slow Mode (default) = internal
output capacitor connected
Voltage 0.01% EO max Ambient temperature
Current 0.02% I
Current 0.02% I
0.002% / 0.02% E
Slow Mode
0.001% / 0.01% E
0.02% / 0.2% I
Slow Mode
0.01% / 0.1% I
max
O
max 0.5-8.5 hours
O
max
O
O
O
max
O
max
O
0 to 50° C
Ambient temperature: 25° C
max
Minus output terminal connected to GND.
max
Current: Short with calibrated shunt.
Voltage: Nominal load
Programming
rise time (R)/fall time (F)
Voltage: Fast Mode
Slow Mode
µs (R)/180µs (F)
180
90ms (R)/175ms (F)
Load ≥ EO max/IO max,
Vout between zero and E
sured between 10% and 90% of E
Current: Fast Mode
Slow Mode
µs (R)/200µs (F)
200
90ms (R)/175ms (F)
Load ≤ EO max/IO max,
Iout between zero and I
between 10% and 90% of I
Transient recovery to load
change (Amplitude/time constant)
Small signal 3-dB Bandwidth
(Fast Mode)
Voltage Fast Mode
Slow Mode
Current Fast Mode 50% I
Voltage 2.5 KHz Load = E
5% E
max/100 µsec
O
0.5% E
max/1 msec
O
max/100 µsec Iout = IO max
O
Vout=400 Vdc and load switched between
infinity and 400/IO max
and load switched between
0.1 x E
Vprog out = 200V d-c (from keypad)
≤ E
max/IO max
O
max/IO max and
O
max/IO max,
O
Vv analog in = 0.2 V rms (from analog
input terminal)
Current 2.3 KHz Load = E
max/IO max,
O
Iprog out = 200 x I
keypad)
Vc analog in = 0.2 V rms (from analog
input terminal)
Slew rate (Fast Mode) Voltage >1.2% E
max (V/µs) Load ≥ EO max/IO max,
O
Measured as the chord of the exponential
response to a square waveform between
Current >1.1% I
zero and E
max (mA/µs) Load = calibrated shunt
O
Measured as the chord of the exponential
O
response to a square waveform between
zero and I
O
Overshoot None Turn ON/OFF
Output Impedance See Table 1-1.
Remote Sensing Range
(default = local sensing)
D-C Isolation voltage BHK 300-0.6MG,
BHK 500-0.4MG,
0.5 V d-c per lead Provisions for 4-terminal (Kelvin) connection to load
1KV d-c or p-p plus max.
Between either output terminal and ground
output voltage
BHK 1000-0.2MG
BHK 2000-0.1MG 0.5KV d-c or p-p plus max.
Between either output terminal and ground
output voltage
max, mea-
O
max, measured
O
max
O
max/EO max (from
O
max and back to zero.
max and back to zero.
O
max
BHK-MG (OPR) 022014 1-3
TABLE 1-2. BHK-MG 200W SPECIFICATIONS (Continued)
SPECIFICATION RATING/DESCRIPTION CONDITION
OUTPUT CHARACTERISTICS (CONTINUED)
Withstand voltage (All models) 1350V a-c/1 min Between shorted inputs and chassis
BHK 300-0.6MG 1950V d-c/1 min Between shorted outputs and chassis.
BHK 500-0.4MG 2250V d-c/1 min
BHK 1000-0.2MG
BHK 2000-0.1MG
Chassis connection to ground
resistance
Leakage Current 25
Enable/Disable Output Power Local Front panel Keypad Enables/disables digital programming sig-
Remote - IEEE 488 (GPIB) port
Output Display Output voltage is displayed with two decimals for BHK 300-0.6MG and
Protection Overtemperature: See PAR. 1.4.10a
Overvoltage/Overcurrent: 0 to 1.1 x EOmax
Uneven voltage/current
in pass element:
Fan failure: See PAR. 1.4.10d
AC line failure: See PAR. 1.4.10e
Interruption between sens-
ing and power terminals:
Overload of main or
auxiliary power transformer:
Internal Output Capacitor
(Default state = internal output
capacitor connected.)
Reference Voltages for analog
programming:
Status port Type Output transistor (open collector) from an optocoupler
Series Connection Automatic or Master-
Parallel Connection Automatic or Master-
BHK 300-0.6MG 20
BHK 500-0.4MG 10
BHK 1000-0.2MG 4
BHK 2000-0.1MG 2
Output Ratings Ic = 8mA d-c, Vceo = 40V d-c, Pd = 150mW@25° C
2800V d-c/1 min
100 mohms max. Between ground input connection and
chassis @ 30A
µA rms /100 uA p-p, for 115V a-c input voltage
(chassis to EARTH-GND)
nals only. Shutdown line is for disable only
- RS 232 port
- Trigger port (shutdown
line)
BHK 500-0.4MG and one decimal for BHK 1000-0.2MG and BHK
2000-0.1MG.Output current for all models is displayed with two decimals when current range is set to High, and three decimals when current range is set to Low.
0 to 1.1 x IOmax (except
BHK 300-0.6MG)
0 to 1.08 x IOmax (BHK
300-0.6MG only)
- removing the signal does not reenable
the output (See PAR. 3.2.7.3).
See PAR. 1.4.4
See PAR. 1.4.10c
See PAR. 1.4.10f
See PAR. 1.4.10g
µF ±6%
µF ±6%
µF±10%
All internal output capacitors are
non-polarized type.
µF±10%
+10 ±-0.2V d-c
–10 ±-0.2V d-c
Logic Saturated transistor when AC line is present
For slave unit, use analog programming
Slave Operation, limited
by the d-c isolation limit
voltage
Slave Operation
only.
For slave unit, use analog programming
only.
max.10 mA d-c
1-4 BHK-MG (OPR) 022014
TABLE 1-2. BHK-MG 200W SPECIFICATIONS (Continued)
SPECIFICATION RATING/DESCRIPTION CONDITION
GENERAL (ENVIRONMENTAL) CHARACTERISTICS
Temperature Operating 0° to +50° C
Storage -20° to +70° C
Humidity
Shock 20g, 11msec ±50%
Vibration 5-10Hz 10mm
Cooling Built-in Fan, exhaust air to rear
0 to 95% RH
half sine
double amplitude
Non condensing
operating & storage
Non operating, 3-axes,
3 shocks each axis
Non operating, 3-axes,
1 hour each axis
PHYSICAL CHARACTERISTICS
Dimensions See Figure 1-2.
Weight English 45 lbs. Unpacked
Metric 20 Kg
a-c source connections Front Circuit Breaker, 2-pole
Rear Detachable IEC 3-wire
type connector
Interlock switch, 1-pole
d-c output terminals Rear panel Terminal Block (11 posi-
tions),
Front panel Jacks (2) ±Output
Control Local: Digital control using front panel keypad(24 pads) and LCD
Remote: Digital control using rear panel IEEE 488 Bus (24 pin female connec-
tor). Analog control using two rear panel terminal strips (10 positions)
for voltage and current
Digital display
front panel
Voltage, current, mode,
settings, menu, program,
etc.
Interlock switch monitors plastic cover
over rear panel terminals.
±Output, ±Sense, Ground, Internal Capacitor (–), Grounding Network
2 x 16 character alphanumeric LCD with
LED backlight
BHK-MG (OPR) 022014 1-5
FIGURE 1-2. BHK SERIES POWER SUPPLY, MECHANICAL OUTLINE DRAWING (SHEET 1 OF 2)
1-6 BHK-MG (OPR) 022014
FIGURE 1-2. BHK SERIES POWER SUPPLY, MECHANICAL OUTLINE DRAWING (SHEET 2 OF 2)
BHK-MG (OPR) 022014 1-7
1.4 FEATURES
1.4.1 LOCAL CONTROL
Front panel keypad entries and an LCD type display are utilized for setting and/or 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 be run once or cycled. Calibration
of the unit is facilitated by a password -protected, menu-driven procedure from the front panel.
Refer to PAR. 3.2 for more information.
1.4.2 REMOTE CONTROL
Remote control of the BHK-MG Power Supply can be accomplished either through digital or
analog programming.
1.4.2.1 DIGITAL PROGRAMMING
Digital control is available directly via either the IEEE 488.2 (GPIB) or RS 232 bus using SCPI
commands. Nearly all features available in local mode can be accessed in remote mode
through digital programming. Refer to PAR’s. 3.3 and 3.5 for more information.
1.4.2.2 ANALOG PROGRAMMING
BHK-MG Power Supplies can also be controlled remotely using analog means, such as analog
voltage or current, fixed or variable resistors, or a combination of them. This great flexibility is
made possible by two uncommitted amplifiers (for voltage and current) and two reference voltages (+10V d-c and -10V d-c) available at the rear panel analog programming terminals. The
chosen means of control (voltage, current, resistance, or a combination) must deliver 0 to –10V
d-c at the output of the uncommitted amplifiers in order to have control over the entire range of
the output voltage/current limit or output current/voltage limit. The analog programming port is
not calibrated, however the zero point is accurate to less than 0.1%. The full scale tolerance is
2% maximum when using the preamplifier with external matched-pair resistors. Refer to PAR.
3.6 for more information about remote programming using the analog programming terminals.
1.4.2.3 ANALOG READBACK
The output voltage and current analog readback signals (uncalibrated), as well as some flag signals, are available for testing and customer usage via an internal connector (A2J5). Refer to
Table 1-3 for details about A2J5 signals; refer to Table 1-5 to obtain the A2J5 mating connector.
Wires (with isolation rated for at least the nominal output voltage of the unit) can be routed
through the wire entry bushing at the rear panel (see Figure 2-2).
1.4.3 DIGITAL CALIBRATION
The BHK-MG Power Supply contains no internal adjustments. Calibration is done entirely via
the front panel keypad and LCD, using a calibrated DVM and a corresponding precision shunt
resistor. Calibration instructions appear on the front panel LCD after a password is entered.
Calibration constants for programming and read-back activities are calculated by the microcontroller and stored in the non-volatile memory. No internal adjustments are necessary The previous calibration is saved and can be restored if desired. The original factory calibration can also
be restored. Refer to Section 4 for more information.
1-8 BHK-MG (OPR) 022014
1.4.4 OVERVOLTAGE/OVERCURRENT PROTECTION
Overvoltage and Overcurrent protection values can be individually programmed. The range for
overvoltage and overcurrent values are 0 to 1.1 x E
max, 0 to 1.1 x IOmax. If the output volt-
O
age/current is maintained at or above the overvoltage/overcurrent protection value for more
than 9ms, the protection circuit latches the pass element off, discharges the output capacitor,
trips the POWER circuit breaker to OFF and sends a flag on a dedicated line (status port connector). The default values are 1.1 x E
max for overvoltage protection, and 1.1 x IOmax for
O
overcurrent protection. Refer to PAR. 3.2.11 for more information.
1.4.5 USER-DEFINED VOLTAGE/CURRENT LIMITS
The BHK-MG Power Supply can be programmed not to exceed user-defined values that can be
lower than the maximum values. For example, the BHK 500-0.4MG, which has maximum output
values of 500V d-c, 0.4A d-c, can be limited to 100V d-c, 0.1A d-c for working with circuitry that
might be damaged by higher levels. Once the limits are set, the power supply becomes, in effect
a 100V d-c, 0.1A d-c supply and values exceeding the limit values will not be accepted. Refer to
PAR. 3.2.12 for more information.
1.4.6 NONVOLATILE STORAGE OF PROGRAMMED SEQUENCES OR ACTIVE SETTINGS
The BHK-MG Power Supply contains 40 memory locations for each current range that can be
used either to preprogram a sequence of output values or to store active settings. For programming sequences each memory location accommodates six parameters: output voltage, output
current, overvoltage, overcurrent, time (how long the parameters are in effect) and the next
address in the sequence. Values are stored in the nonvolatile memory, and are retained when
the unit is turned off. Refer to PAR. 3.2.16 for more information.
The same 40 memory locations are also available to save the active programmed settings (voltage, current, overvoltage, overcurrent). The saved setting can be recalled by specifying the
memory location. Refer to PAR’s. 3.2.13 and 3.2.14 for more information.
1.4.7 CURRENT SCALE
Output current of the power supply can be scaled down by a factor of 10, while at the same time
increasing the current resolution by a factor of 10. For example the BHK 500-0.4MG has maximum output values of 500V d-c, 0.4A d-c and a current resolution of 0.1mA d-c; scaling down
the output current results in a power supply with maximum values of 500V d-c, 0.04A d-c with a
current resolution of 0.01mA d-c. Current scaling is easily accomplished using the Menu. Refer
to PAR. 3.2.10 for more information.
Measurement of a decreasing output current of the power supply that falls below 8.98% ±0.01%
of the rated value is automatically measured with increased resolution/accuracy by a factor of
10 until the current rises above 9.69% ±0.01% of rated value.
The factory setting is for the high current range, shown on the top line of the LCD in command
entry status by the message “Ihigh.” The current scale setting is retained, and displayed upon
turn-on as either Ihigh or Ilow.
1.4.8 FAST MODE/SLOW MODE SELECTION
BHK-MG Series Power Supplies can be configured by external strapping for either slow mode
operation with the internal output capacitor connected to the output, or fast mode operation with
the internal output capacitor disconnected from the output. The slow mode (default state) is recommended for voltage stabilization because of its low output noise and low recovery amplitude
BHK-MG (OPR) 022014 1-9
to a dynamically changing load. The fast mode offers a faster response to step or dynamic programming of the output voltage (in voltage mode), when the power supply is used as a power
amplifier. Fast mode is also recommended for current stabilization because of its fast response
to a dynamically changing load. Refer to PAR. 3.7.1 for more information.
1.4.9 EXTERNAL TRIGGER PORT
The external trigger port provides two functions: a trigger input can be used to restore the output
to previously defined settings using SCPI commands (see PAR. 3.3.4) and a shutdown input
can be used to immediately shut down the power supply output (see PAR. 3.2.7.3).
1.4.10 BUILT-IN PROTECTION
BHK-MG Series Power Supplies provide built-in protection against the following:
a. Overtemperature of the pass element. Heatsink temperature is monitored. If an overtem-
perature condition is maintained for more than 0.5ms, the following actions are initiated: the
pass element is cut off and latched off, the output capacitor is discharged, the LCD displays
the error message “BHK FAILURE“ and an error message is sent on the IEEE 488 Bus.
b. Overvoltage/overcurrent at the output. See PAR. 1.4.4
c. Uneven voltage/current in the pass element. Voltage is monitored across different transis-
tors of the pass element while current is monitored through the different branches. If uneven
voltage/current continues for more than 11ms, the pass element is latched off, the output
capacitor is discharged, the POWER circuit breaker is tripped to OFF and a flag is sent to the
host computer on a dedicated line (Status Port connector)
d. Fan failure. If fan current drops below predetermined value continuously for more than
16ms, the pass element is latched off, the output capacitor is discharged, the LCD displays
the error message “BHK FAILURE” and an error message is sent on IEEE 488 Bus.
e. AC line failure. If AC line is missing for more than 8 ms, a flag is sent to the host computer
on a dedicated line (Status Port connector). In addition, if the jumper at A7-J12 is installed
(default state), the pass element is latched off, the output capacitor is discharged, and the
POWER circuit breaker is tripped to OFF.
f. Interruption between the sensing and corresponding power output terminals. If there
is an interruption between the sensing and power terminals, two diodes connected in parallel
between the sensing lead and the corresponding power lead (one forward biased and one
reverse biased), allow the power supply to continue to function.
g. Overload of the main or auxiliary power transformer. If input current of the main trans-
former exceeds 7A a-c @ 115V a-c or 3.5A a-c @ 230V a-c, the input POWER circuit
breaker is tripped to OFF, the pass element is latched off, the output capacitor is discharged,
and a flag is sent to the Status Port connector. The reaction time is inversely proportional to
the input overcurrent: from a minimum of 10ms for 10 times nominal overcurrent, to a maximum of 100 seconds for 25% above nominal current.
If input current of the auxiliary power transformer exceeds a predetermined value, in most
cases the input POWER circuit breaker is tripped to OFF (if jumper A7J12 is installed), the
pass element is latched off, the output capacitor is discharged, and a flag is sent to the Status Port connector. If the cause of the overload is a problem in the protection circuit, the input
POWER circuit breaker may not trip off: the pass element will be latched off and the output
capacitor will discharge more slowly, and a flag is sent to the status port. The reaction time in
this case is determined by PTC (positive temperature coefficient) thermistor A5R1 between
30 and 100 seconds.
1-10 BHK-MG (OPR) 022014
h. Current Limit. The current through the main branch of the pass element is monitored. If this
current is maintained between 1.8 to 2.2 times larger than the nominal value for more than
11ms, the pass element is latched off, the output capacitor is discharged, and the POWER
circuit breaker is tripped to OFF.
1.4.11 CURRENT SINK CAPABILITY
BHK-MG 200W Series power supplies are able to sink up to 5% of the nominal current when in
voltage mode and 50% of the unit's maximum rated current when in current mode. The fixed
current mode sink value is model dependent and has a tolerance of 10%. Since negative current is not displayed on the front panel meter, it is transparent to the user when the unit enters
sink mode.
This capability is useful in applications such as capacitor testing, where the sink capability
allows the rapid discharge of the device under test, permitting subsequent tests to be started
earlier, thus increasing the throughput of the testing process.
The sink current in current mode is quite stable, allowing this feature to be used with the discharging process to determine the value of a capacitor under test by measuring the discharge
time, using the formula C = T x I / V (the charge time, which is more accurate, can also be used
in the formula), where
T = discharge or charge time
V = change in voltage from fully charged to fully discharged, or vice versa.
I = discharging or charging current (BHK-MG charging current has a tolerance of
0.05% of nominal value, discharge current has a tolerance of 10% of nominal value)
The value of the capacitor under test can be calculated directly by measuring T and either using
the above formula and the appropriate tolerance for I, or by comparing T to that of a known
capacitor value.
Once the capacitor under test completely discharges, current from the power supply’s internal
current generator will flow through the output protection diode (or, in some models, multiple
diodes), resulting in a slight reverse voltage at the output which will be clamped to the value of
the voltage drop across the diode(s).
BHK-MG (OPR) 022014 1-11
1.4.12 ANALOG READBACK AND FLAG SIGNALS AVAILABLE FOR CUSTOMER USE
Some internal signals produced by the unit are available at connector A2J5 for either monitoring
or testing purposes. Refer to Table 1-3 for a description of available signals
TABLE 1-3. CONNECTOR A2J5 SIGNAL DESCRIPTIONS
SIGNAL PIN. NO. VALUE TYPE
Current Scale Flag 1
Step Down Flag 2
Power GND 3 N/A
V-C Mode Flag 4
Signal GND 5, 7 N/A
Current Monitor
(not calibrated)
Voltage Monitor
(not calibrated)
* Recommended load equal to or greater than 10K ohms.
6
8
≈ 0V for HIGH current scale
> +13V for LOW current scale
< -11V for steady or step-up output
> +11V for step-down output, or when protection circuit has functioned and “BHK
FAILURE” error message is displayed
< -11V for CV (Constant Voltage) mode
> +11V for CC (Constant Current) mode
0V ± 10mV (for IO = 0mA) to
+10V ± 0.12V (for IO = Full Scale)
0V ± 10mV (for EO = 0V to)
+10V ± 0.25V (for EO = Full Scale)
1.5 EQUIPMENT SUPPLIED
Equipment supplied with the unit is listed in Table 1-4.
Collector of PNP transistor (A2Q3)
through 1K resistance.*
Output of open loop Op Amp
(A2U4B) through 1K resistance.*
Recommended to be used as Return
for signals at pins 1, 2, and 4.*
Output of open loop Op Amp
(A2U4A) through 1K resistance.*
Recommended to be used as Return
for signals at pins 6 and 8.*
Output of closed loop Op Amp
(A2U7) *
Output of closed loop Op Amp
(A2U1) *
TABLE 1-4. EQUIPMENT SUPPLIED
ITEM
Power Cord 118-0557 1
Plug, 2-contact for ± front panel output jacks 142-0489 1
Contact, pin type (used on plug 142-0489) 107-0361 2
Status Port mating connector 143-0296 1
Two-terminal Link for rear panel output 172-0300 2
Three-terminal Link for rear panel output 172-0305 2
Four-terminal Link for rear panel output (installed) 172-0407 2
Five-terminal Link for rear panel output 172-0321 1
Six-terminal Link for rear panel output 172-0408 1
PART NUMBER QUANTITY
1-12 BHK-MG (OPR) 022014
1.6 ACCESSORIES
Accessories for the BHK Power Supply are listed in Table 1-5.
TABLE 1-5. ACCESSORIES
ITEM FUNCTION
IEEE 488 (GPIB) Cable, 1m long Connect BHK-MG Power Supply to GPIB bus. SNC 488-1
IEEE 488 (GPIB) Cable, 2m long Connect BHK-MG Power Supply to GPIB bus. SNC 488-2
IEEE 488 (GPIB) Cable, 4m long Connect BHK-MG Power Supply to GPIB bus. SNC 488-4
Slide (2) Allows rack-mounted units to slide in and out. CS-01, -02, -03 (Kepco)
External Trigger Port mating connector Allows access to external trigger function. 142-0527 (Kepco)
RS 232 Port Adapter Cable Kit Contains RJ 45 Patch cord, two RS 232 adapt-
ers (one with male pins to connect to DTE
equipment and one with female pins to connect
to a personal computer), and an RS 232 Loop
Back test Connector (to test RS 232 communication and aid in isolating RS 232 communication problems).
Mating connector for A2J5 (Analog Readback and Flags)
Allow user access to analog readback and flag
signal; see Table 1-3 for details.
PART NUMBER
110-QD-14-2 (Jonathan)
SP-2501 (CUI)
KIT 219-0436
143-0359
1.7 SAFETY
There are no operator serviceable parts inside the case. Service must be referred to authorized
personnel. Using the power supply in a manner not specified by Kepco. Inc. may impair the protection provided by the power supply. Observe all safety precautions noted throughout this manual. Table 1-6 lists symbols used on the power supply or in this manual where applicable.
TABLE 1-6. SAFETY SYMBOLS
SYMBOL MEANING
CAUTION: RISK OF ELECTRIC SHOCK.
CAUTION: REFER TO REFERENCED PROCEDURE.
!
WARNING INDICATES THE POSSIBILITY OF BODILY INJURY OR DEATH.
CAUTION INDICATES THE POSSIBILITY OF EQUIPMENT DAMAGE.
BHK-MG (OPR) 022014 1-13/(1-14 Blank)
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