Kepco ABC-DM User Manual

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OPERATOR’S MANUAL

VOLTAGE/CURRENT-STABILIZED DC SOURCE

KEPCO INC.

ABC-DM SERIES

SWITCHING POWER SUPPLY

MODEL

ABC-DM 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, INC. z 131-38 SANFORD AVENUE z FLUSHING, NY. 11352 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

KEPCO®

THE POWER SUPPLIER™

GETTING STARTED

SIMPLIFIED OPERATING INSTRUCTIONS

These instructions are a quick reference for getting started with Kepco’s ABC power supply. For more detailed information you are encouraged to read the accompanying Operator’s Manual.

CONNECT THE LOAD.

The Sense terminals must be connected for the power

supply to work. For local sensing use the links supplied on the barrier strip at the rear.

For remote sensing, remove the links and make the 4-wire connections at your load. (See the Operator’s manual for more information.)

CONNECT SOURCE POWER.

power: 85-264V a-c, 47-63 Hz or 400Hz. The POWER switch turns the unit on and off. The power supply is equipped with a grounded North American 2-blade plug. Overseas users may substitute their national plug; the chassis end is a standard 15A IEC connector.

The power supply accepts a wide range of source

LOCAL OPERATION

THE ALPHANUMERIC DISPLAY (LCD)

and observed on the LCD. Optimize LCD contrast by pressing MENU once, then press numbers until viewing is optimum. The LCD displays the actual output voltage and current and the operating mode: Local or Remote and constant voltage (CV) or current (CC). and a blinking colon (:), or a blinking equal sign (=). Enter a command when you see a blinking colon (:), enter numbers when you see a blinking equal sign (=). Six keys have a dual function (command/number): the blinking colon (:) or equal sign (=) tells you which key function is effective.

USING THE KEYPAD

Use CLEAR if you make a mistake and don’t want to change the status quo. Valid entries are accompanied by a short beep; invalid entries by a longer buzz. (The speaker can be disabled by pressing MENU three times and entering 0.)

. Use ENTER to accept numbers entered or execute a command.

. Operations are done from the keypad

OUTPUT SETTINGS.

on the mode (CV or CC), one setting acts as a limit. (For example, in CC mode, V SET is the voltage limit and I SET is the output current setting.) The operating mode (CC or CV) is determined by the load combined with the V SET and I SET settings. The Î and Í keys can be used to increase or decrease output voltage (CV mode) or current (CC mode) by the least amount possible (approximately the maximum rating divided by 4000).

OUTPUT ON/OFF.

(OFF) sets output voltage and current to zero and the LCD reads “Output is OFF’”

RESET.

SET and OC SET at approximately 10% above rated output).

PROTECTION.

conditions. If the output attempts to exceed programmed OV SET or OC SET values, the LCD indicates which condition occurred, and the output goes to zero. RESET or cycle the power supply off and on to recover.

CALIBRATION.

tected). The initial password is the voltage rating plus current rating (e.g., 1010 for ABC 10-10DM). You can change it with using the MENU. The previous calibration is saved and can be restored. The original factory calibration can also be restored. (See Section 4 of the Operator’s Manual.)

Use RESET to restore the power-on defaults (output on, V SET and I SET at zero, OV

OV SET and OC SET establish protection for overvoltage and overcurrent

CALIB leads you through a digital calibration procedure (password pro-

V SET sets output voltage; I SET sets output current. Depending

(ON) enables programmed output settings to appear at the output

ABCCOND012703 A

STORAGE LOCATIONS.

to establish a local program that can be sequenced (EDIT PROG). STORE lets you save the active programmed settings (V SET, I SET, OV SET and OC SET). Just select a location (from 1 to 40). RECALL applies the V SET and I SET values previously stored.

Forty locations are available to either save active settings or

LOCAL PROGRAMMING.

gramming. Each location stores values for six parameters: output voltage, output current, overcurrent protection, overvoltage protection, time duration (between 0.01 and 300 seconds) for the programmed parameters, and the address of the next memory location in the program. Local programs are set up using EDIT PROG; a MEMORY LOCATION WORKSHEET table included in the Operator’s Manual helps you to program Kepco’s ABC.

Select the starting location and enter the desired values for each parameter. Use Î or Í key to scroll forward or backward to view the next parameter or memory location. Set the last address to 0 for the program to run once and stop. If you want the program to cycle indefinitely, set the last address to the starting address. After all parameters have been entered, use CLEAR or ENTER to exit EDIT PROG mode. To run the program one step at a time, press STEP, select a starting location, then press STEP to execute the next step. To run the program, press RUN and select the starting location. If the program is designed to cycle, press CLEAR or RESET to stop it. The TIME key offers a quick and easy way to change the time for any memory location without entering EDIT PROG mode.

MENU FEATURES.

exit, enter number(s) and press ENTER to change a feature. The following features are included:

Press MENU to scroll through the MENU functions. Press CLEAR to

The same forty locations are also available for local pro-

• Set LCD contrast: set from 1 to 9 for optimum viewing.

• Set GPIB address select: Set from1 to 30

• DCL Control: Allows DCL (Device Clear) to either set output to 0V or have no effect on output voltage

• Set speaker on/off: 0 to disable beeps and buzzes, 1 to enable.

• Change password (required for calibration):. Enter old password, then the new password.

• Restore previous calibration values: (See Section 4 of Operator’s Manual.)

• View Model number, Serial number and firmware version (not changeable)

• Set maximum values for V SET and I SET: To prevent damage to a sensitive load the maximum output voltage and current can be reduced from the rated value to a userselected maximum.

• Delay protection: To allow for large initial transients (e.g., from inductive loads), overvoltage and overcurrent protection can be delayed about 8 seconds by entering a count (count of 30 is about one second, maximum count is 255). If an overvoltage or overcurrent condition is still present at the end of the delay, protection trips the power supply off.

ABCSVC012703

Declaration of Conformity

Application of Council directives:

Standard to which Conformity is declared:

EN61010-1: 1993 +A2: 1995

EN61326-1:1997

Manufacturer's Name and Address:

Importer's Name and Address:

Type of Equipment:

73/23/EEC (LVD) 89/336/EEC(EMC) 93/68/EEC (CE mark)

(Safety requirements for electrical equipment for measurement, control and laboratory use)

(Electrical equipment for measurement, control and laboratory use - EMC requirements)

KEPCO INC. 131-38 SANFORD AVENUE FLUSHING, N.Y. 11352 USA

Power Supply

Model No.:

Year of Manufacture:

I, the undersigned, declare that the product specified above, when used in accordance with the product instruction manual, complies with the requirements of the Low Voltage Directive 73/23/EEC and the EMC Directive 89/336/EEC, which forms the basis for application of the CE Mark to this product.

Place: KEPCO Inc.

131-38 Sanford Ave. Flushing, N.Y.11352 USA

Date:

228-1346 DC-ABC 012703

ABC SERIES MODEL NUMBER]

Saul Kupferberg

(Full Name)

VP OF SALES

(position)

C/D Blank))

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 Local Control ........................................................................................................................................... 1-7

1.5 Remote Control ....................................................................................................................................... 1-7

1.6 Features .................................................................................................................................................. 1-7

1.6.1 Digital Calibration............................................................................................................................... 1-7

1.6.2 Overvoltage/Overcurrent Protection .................................................................................................. 1-7

1.6.3 Programmable Overvoltage/Overcurrent Delay................................................................................. 1-7

1.6.4 Non-volatile Storage of Programmed Sequences or Active Settings ................................................ 1-7

1.6.5 User-defined Voltage/Current Limits.................................................................................................. 1-8

1.7 Equipment Supplied ................................................................................................................................ 1-8

1.8 Accessories ............................................................................................................................................. 1-8

1.9 Safety ...................................................................................................................................................... 1-8

1.10 Ripple/Noise Measurement ..................................................................................................................... 1-9

SECTION 2 - INSTALLATION

2.1 Unpacking and Inspection ....................................................................................................................... 2-1

2.2 Terminations and Controls ...................................................................................................................... 2-1

2.3 Source Power Requirements .................................................................................................................. 2-2

2.4 Cooling .................................................................................................................................................... 2-2

2.5 Preliminary Operational Check................................................................................................................ 2-2

2.6 Installation ............................................................................................................................................... 2-3

2.7 Wiring Instructions................................................................................................................................... 2-3

2.7.1 Safety Grounding............................................................................................................................... 2-4

2.7.2 Source Power Connections ............................................................................................................... 2-4

2.7.3 D-C Output Grounding....................................................................................................................... 2-4

2.7.4 Power Supply/Load Interface............................................................................................................. 2-5

2.7.5 Load Connection - General................................................................................................................ 2-5

2.7.6 Load Connection Using Local Sensing.............................................................................................. 2-6

2.7.7 Load Connection Using Remote Sensing.......................................................................................... 2-7

2.8 Operating Configuration .......................................................................................................................... 2-7

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

3.2.2 Turning the Power Supply On............................................................................................................ 3-4

3.2.3 Setting Local Mode............................................................................................................................ 3-4

3.2.4 Adjusting LCD Contrast ..................................................................................................................... 3-5

3.2.5 Enabling/Disabling Audible Beeps..................................................................................................... 3-5

3.2.6 Enabling/Disabling DC Output Power................................................................................................ 3-5

3.2.6.1 Power Up Digital DC Output Control............................................................................................ 3-5

3.2.7 Reset ................................................................................................................................................. 3-5

3.2.8 Setting Output Voltage or Current ..................................................................................................... 3-5

3.2.9 Setting Overvoltage or Overcurrent Protection.................................................................................. 3-6

3.2.10 Changing Protection Delay ................................................................................................................ 3-6

3.2.11 Changing Maximum Voltage or Current Value .................................................................................. 3-6

3.2.12 Storing Power Supply Output Settings .............................................................................................. 3-7

3.2.13 Recalling Stored Output Settings....................................................................................................... 3-7

3.2.14 Local Mode Programming of the Power Supply. ............................................................................... 3-7

ABC 012703

TABLE OF CONTENTS

SECTION PAGE

3.2.14.1 Creating or Modifying a Program (Program Edit Mode).............................................................. 3-7

3.2.14.1.1 Modifying Programmed Time Interval..................................................................................... 3-8

3.2.14.1.2 Time Interval Accuracy........................................................................................................... 3-8

3.2.14.2 Running a Program..................................................................................................................... 3-8

3.2.14.3 Stepping Through a Program...................................................................................................... 3-8

3.2.14.4 Cycling a Program....................................................................................................................... 3-8

3.2.14.5 Running a Program Once ........................................................................................................... 3-10

3.2.14.6 Stopping a Program .................................................................................................................... 3-10

3.2.14.7 Stopping a Running Program...................................................................................................... 3-10

3.2.14.8 Sample Program ......................................................................................................................... 3-10

3.2.15 Calibration......................................................................................................................................... 3-10

3.3 Remote Mode Programming................................................................................................................... 3-11

3.3.1 IEEE 488 (GPIB) Bus Protocol ......................................................................................................... 3-11

3.3.2 DCL Control ...................................................................................................................................... 3-12

3.3.3 Changing the GPIB Address............................................................................................................. 3-13

3.3.4 ABC VISA Instrument driver ............................................................................................................. 3-13

3.3.4.1 VISA Instrument Driver Functions............................................................................................... 3-13

3.3.4.2 VISA Instrument Driver Programming Reference Manual .......................................................... 3-17

3.3.4.3 Demonstration Program Using the VISA Driver .......................................................................... 3-17

3.3.5 Programming Techniques to Optimize Power Supply performance ................................................. 3-19

3.3.5.1 Example of Proper Programming................................................................................................ 3-19

3.3.5.2 Explanation of Programming Techniques ................................................................................... 3-19

3.4 SCPI Programming................................................................................................................................. 3-20

3.4.1 SCPI Messages................................................................................................................................ 3-20

3.4.2 Common Commands/Queries .......................................................................................................... 3-20

3.4.3 SCPI Subsystem Command/Query Structure................................................................................... 3-20

3.4.3.1 ABORt Subsystem ...................................................................................................................... 3-20

3.4.3.2 DISPlay Subsystem ................................................................................................................... 3-20

3.4.3.3 INITiate Subsystem..................................................................................................................... 3-20

3.4.3.4 LIST Subsystem.......................................................................................................................... 3-21

3.4.3.5 MEASure Subsystem.................................................................................................................. 3-21

3.4.3.6 OUTPut Subsystem .................................................................................................................... 3-21

3.4.3.7 Protection Subsystem ................................................................................................................. 3-21

3.4.3.8 STATus Subsystem .................................................................................................................... 3-21

3.4.3.9 TRIGger subsystem .................................................................................................................... 3-21

3.4.3.10 [SOURce:]VOLTage and [SOURce:]CURRent Subsystems ...................................................... 3-21

3.4.3.11 CALibrate Subsystem ................................................................................................................. 3-21

3.4.4 Program Message Structure ............................................................................................................. 3-22

3.4.4.1 Keyword ...................................................................................................................................... 3-22

3.4.4.2 Keyword Separator ..................................................................................................................... 3-24

3.4.4.3 Query Indicator............................................................................................................................ 3-24

3.4.4.4 Data............................................................................................................................................. 3-24

3.4.4.5 Data Separator............................................................................................................................ 3-24

3.4.4.6 Message Unit Separator ............................................................................................................. 3-25

3.4.4.7 Root Specifier.............................................................................................................................. 3-25

3.4.4.8 Message Terminator ................................................................................................................... 3-25

3.4.5 Understanding The Command Structure .......................................................................................... 3-25

3.4.6 Program Message Syntax Summary ................................................................................................ 3-26

3.4.7 SCPI Program Examples .................................................................................................................. 3-26

3.5 Operator Maintenance............................................................................................................................ 3-27

SECTION 4 - CALIBRATION

4.1 General................................................................................................................................................... 4-1

4.2 Equipment Required............................................................................................................................... 4-1

4.3 Calibration Procedures........................................................................................................................... 4-1

4.3.1 Voltage Calibration............................................................................................................................ 4-2

4.3.2 Current Calibration............................................................................................................................ 4-2

4.4 Changing the Calibration Password ....................................................................................................... 4-3

ABC 012703

TABLE OF CONTENTS

SECTION PAGE

4.5 Restoring Previous Calibration Values.................................................................................................... 4-4

4.6 Restoring Factory Calibration Values...................................................................................................... 4-4

4.7 Setting Factory Calibration Values .......................................................................................................... 4-4

APPENDIX A - IEEE 488.2 COMMAND/QUERY DEFINITIONS

A.2 *CLS — Clear Status Command .......................................................................................................... A-1

A.3 *ESE — Standard Event Status Enable Command ............................................................................... A-1

A.4 *ESE? — Standard Event Status Enable Query .................................................................................... A-2

A.5 *ESR? — Event Status Register Query ................................................................................................ A-2

A.6 *IDN? — Identification Query ................................................................................................................. A-2

A.7 *OPC — Operation Complete Command............................................................................................... A-2

A.8 *OPC? — Operation Complete Query.................................................................................................... A-3

A.9 *OPT? — Options Query........................................................................................................................ A-3

A.10 *RCL — Recall Command...................................................................................................................... A-3

A.11 *RST — Reset Command ...................................................................................................................... A-4

A.12 * SAV — Save Command ..................................................................................................................... A-5

A.13 *SRE — Service Request Enable Command........................................................................................ A-5

A.14 *SRE? — Service Request Enable Query.............................................................................................. A-5

A.15 *STB? — Status Byte Register Query................................................................................................... A-5

A.16 *TRG — Trigger Command................................................................................................................... A-6

A.17 *TST? — Self Test Query....................................................................................................................... A-6

APPENDIX B - SCPI COMMAND/QUERY DEFINITIONS

B.1 Introduction............................................................................................................................................. B-1

B.2 ABORt Command................................................................................................................................... B-1

B.3 CALibrate:CURRent:LEVel Command ................................................................................................... B-2

B.4 CALibrate:CURRent[:DATA] Command................................................................................................. B-3

B.5 CALibrate:PASSword Command ........................................................................................................... B-3

B.6 CALibrate:SAVE Command ................................................................................................................... B-4

B.7 CALibrate:STATus Command................................................................................................................ B-4

B.8 CALibrate:STATus? Query..................................................................................................................... B-4

B.9 CALibrate:VOLTage:LEVel Command................................................................................................... B-4

B.10 CALibrate:VOLTage[:DATA] Command ................................................................................................. B-4

B.11 CALibrate:ZERO Command................................................................................................................... B-5

B.12 DISPlay:CONTrast Command................................................................................................................ B-5

B.13 DISPlay:CONTrast? Query .................................................................................................................... B-5

B.14 DISPlay:MODE Command..................................................................................................................... B-5

B.15 DISPlay:MODE? Query.......................................................................................................................... B-5

B.16 DISPlay:TEXT Command....................................................................................................................... B-6

B.17 DISPlay:TEXT? Query ........................................................................................................................... B-6

B.18 INITiate[:IMMediate] Command ............................................................................................................. B-6

B.19 INITiate:CONTinuous Command ........................................................................................................... B-6

B.20 INITiate:CONTinuous Query .................................................................................................................. B-6

B.21 INSTrument:STATe Command .............................................................................................................. B-6

B.22 LIST:CURRent Command...................................................................................................................... B-7

B.23 [SOUR:]LIST:CURRent? Query ............................................................................................................. B-7

B.24 [SOUR:]LIST:CURRent:PROTect Command......................................................................................... B-7

B.25 [SOUR:]LIST:CURRent:PROTect? Query.............................................................................................. B-8

B.26 [SOUR:]LIST:DWELl Command............................................................................................................. B-8

B.27 [SOUR:]LIST:DWELl? Query ................................................................................................................. B-8

B.28 [SOUR:]LIST:INDex Command.............................................................................................................. B-8

B.29 [SOUR:]LIST:INDex? Query................................................................................................................... B-8

B.30 [SOUR:]LIST:SEQuence:NEXT Command ............................................................................................ B-8

B.31 [SOUR:]LIST:SEQuence:NEXT? Query................................................................................................. B-8

B.32 [SOUR:]LIST:SEQuence:STARt Command ........................................................................................... B-9

B.33 [SOUR:]LIST:SEQuence:STARt? Query................................................................................................ B-9

ABC 012703

iii

TABLE OF CONTENTS

SECTION PAGE

B.34 [SOUR:]LIST:VOLTage Command......................................................................................................... B-9

B.35 [SOUR:]LIST:VOLTage? Query.............................................................................................................. B-9

B.36 [SOUR:]LIST:VOLTage:PROTect Command ......................................................................................... B-9

B.37 [SOUR:]LIST:VOLTage:PROTect Query................................................................................................ B-9

B.38 MEASure[:SCALar]:CURRent[:DC]? Query ........................................................................................... B-10

B.39 MEASure[:VOLTage][:SCALar][:DC]? Query ......................................................................................... B-10

B.40 OUTPut[:STATe] Command................................................................................................................... B-10

B.41 OUTPut[:STATe] Query.......................................................................................................................... B-10

B.42 OUTPut:PROTection:DELay Command................................................................................................. B-10

B.43 OUTPut:PROTection:DELay Query........................................................................................................ B-10

B.44 PROGram:SELect:STATe Command..................................................................................................... B-11

B.45 PROGram:SELect:STATe? Query ......................................................................................................... B-11

B.46 READ[:SCALar]:CURRent[:DC]? Query................................................................................................. B-11

B.47 READ[:VOLTage][:SCALar][:DC]? Query............................................................................................... B-11

B.48 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude] Command.......................................................... B-11

B.49 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude] Query................................................................. B-11

B.50 [SOURce:]CURRent:[:LEVel]TRIGgered[:AMPlitude] Command........................................................... B-11

B.51 [SOURce:]CURRent:[:LEVel]TRIGgered[:AMPlitude]? Query................................................................ B-12

B.52 [SOURce:]CURRent:PROTection[:LEVel] Command ............................................................................ B-12

B.53 [SOURce:]CURRent:PROTection[:LEVel]? Query ................................................................................. B-13

B.54 [SOURce:]CURRent:PROTection:CLEar Command.............................................................................. B-13

B.55 [SOURce:]CURRent:PROTection:TRIPped? Query............................................................................... B-13

B.56 [SOURce:]CURRent:LIMit:HIGH Command........................................................................................... B-13

B.57 [SOURce:]CURRent:LIMit:HIGH? Query................................................................................................ B-13

B.58 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude] Command.......................................................... B-13

B.59 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude]? Query............................................................... B-14

B.60 [SOURce:]VOLTage:[:LEVel]TRIGgered[:AMPlitude] Command........................................................... B-14

B.61 [SOURce:]VOLTage:[:LEVel]TRIGgered[:AMPlitude]? Query................................................................ B-14

B.62 [SOURce:]VOLTage:LIMit:HIGH Command........................................................................................... B-14

B.63 [SOURce:]VOLTage:LIMit:HIGH? Query................................................................................................ B-14

B.64 [SOURce:]VOLTage:PROTection[:LEVel] Command ............................................................................ B-14

B.65 [SOURce:]VOLTage:PROTection[:LEVel]? Query ................................................................................. B-15

B.66 [SOURce:]VOLTage:PROTection:CLEar Command.............................................................................. B-15

B.67 [SOURce:]VOLTage:PROTection:TRIPped? Query............................................................................... B-15

B.68 [SOURce:]FUNCtion:MODE? Query ...................................................................................................... B-16

B.69 STATus:OPERation:CONDition Query................................................................................................... B-16

B.70 STATus:OPEReration:ENABle Command ............................................................................................. B-16

B.71 STATus:OPEReration:ENABle? Query .................................................................................................. B-16

B.72 STATus:OPERation[:EVENt] Query....................................................................................................... B-16

B.73 STATus:PRESet Command ................................................................................................................... B-17

B.74 STATus:QUEStionable[:EVENt]? Query ................................................................................................ B-17

B.75 STATus:QUEStionable:CONDition? Query ............................................................................................ B-18

B.76 STATus::QUEStionable:ENABle Command........................................................................................... B-18

B.77 STATus:QUEStionable:ENABle? Query................................................................................................. B-18

B.78 SYSTem:ERRor[:NEXT]? Query ............................................................................................................ B-18

B.79 SYSTem:ERRor:CODE? Query ............................................................................................................. B-18

B.80 SYSTem:ERRor:CODE:ALL? Query...................................................................................................... B-18

B.81 SYSTem:KLOCk Command ................................................................................................................... B-20

B.82 SYSTem:KLOCk? Query........................................................................................................................ B-20

B.83 SYSTem:LANGuage? Query.................................................................................................................. B-20

B.84 SYSTem:LANGuage COMMAND........................................................................................................... B-20

B.85 SYSTem:PASSword:CENable Command.............................................................................................. B-20

B.86 SYSTem:PASSword:CDISable Command............................................................................................. B-20

B.87 SYSTem:PASSword:STATe? Query...................................................................................................... B-20

B.88 SYSTem:SECurity:IMMediate Command............................................................................................... B-21

B.89 SYSTem:SET Command........................................................................................................................ B-21

B.90 SYSTem:VERSion Query....................................................................................................................... B-21

ABC 012703

LIST OF FIGURES

FIGURE TITLE PAGE

1-1 ABC Series Power Supply .......................................................................................................................... viii

1-2 ABC Series Power Supply, Mechanical Outline Drawing............................................................................ 1-4

1-3 ABC Power Supply and RA 71 Rack Adapter, Outline Drawing................................................................. 1-5

1-4 Two ABC Power SUpplies and RA 72 Rack Adapter, Outline Drawing ...................................................... 1-6

1-5 Ripple and Spike Measurement Cables...................................................................................................... 1-9

2-1 ABC Series Front Panel.............................................................................................................................. 2-1

2-2 ABC Series Rear Panel .............................................................................................................................. 2-1

2-3 LCD Power On Defaults.............................................................................................................................. 2-3

2-4 Grounded Load Connections, Local Sensing ............................................................................................. 2-6

2-5 Isolated Load Connections, Local Sensing................................................................................................. 2-6

2-6 Grounded Load Connections, Remote Sensing ......................................................................................... 2-7

2-7 Isolated Load Connections, Remote Sensing............................................................................................. 2-7

3-1 LCD Power On Defaults.............................................................................................................................. 3-4

3-2 ABC VISA Application, Virtual Panel .......................................................................................................... 3-18

3-3 Tree Diagram of SCPI Commands Used with ABC Power Supply............................................................. 3-23

3-4 Message Structure...................................................................................................................................... 3-24

3-5 Typical Example Of ABC Power Supply Program Using SCPI Commands................................................ 3-27

A-1 GPIB Commands....................................................................................................................................... A-4

B-1 Programming the Output............................................................................................................................ B-2

B-2 Using Calibration Commands and Queries................................................................................................ B-3

B-3 Using Display Commands.......................................................................................................................... B-5

B-4 Using LIST Commands and Queries ......................................................................................................... B-7

B-5 Programming Current ................................................................................................................................ B-12

B-6 Programming Voltage ................................................................................................................................ B-15

B-7 Using Status Commands and Queries....................................................................................................... B-17

B-8 Using Sytem Commands and Queries....................................................................................................... B-21

ABC 012703

v/(vi Blank)

LIST OF TABLES

TABLE TITLE PAGE

1-1 Model Parameters .......................................................................................................................................1-1

1-2 Maximum Overvoltage and Overcurrent Settings .......................................................................................1-1

1-3 ABC Specifications .....................................................................................................................................1-2

1-4 Accessories .................................................................................................................................................1-8

1-5 Safety Symbols ...........................................................................................................................................1-8

2-1 Input/Output Pin Assignments for Remote Control .....................................................................................2-2

3-1 Key Functions .............................................................................................................................................3-2

3-2 Memory Location Worksheet ......................................................................................................................3-9

3-3 Sample Program (Model ABC 10-10DM) ....................................................................................................3-10

3-4 IEEE 488 (GPIB) Bus Interface Functions ..................................................................................................3-11

3-5 IEEE 488 (GPIB) Bus Command Mode Messages .....................................................................................3-12

3-6 IEEE 488 (GPIB) Bus Data Mode Messages ..............................................................................................3-12

3-7 ABC VISA Driver Functions ........................................................................................................................3-13

3-8 Rules Governing Shortform Keywords ........................................................................................................3-22

4-1 Factory Default Calibration Passwords .......................................................................................................4-3

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-5

B-1 SCPI Subsystem Command/query Index .................................................................................................. B-1

B-2 Operation Condition Register, Operation Enable Register,

and Operation Event Register Bits .......................................................................................................... B-16

B-3 Questionable Event Register, Questionable Condition Register

and Questionable Condition Enable Register Bits .................................................................................. B-17

B-4 Error Messages ..........................................................................................................................................B-19

B-5 Master Passwords ..................................................................................................................................... B-21

ABC 012703

vii

FIGURE 1-1. ABC SERIES POWER SUPPLY

viii

ABC 012703

1.1 SCOPE OF MANUAL

This manual contains instructions for the installation and operation of the ABC series of 100 Watt bench-top, voltage and current stabilized d-c power supplies manufactured by Kepco, Inc., Flushing, New York, U.S.A.

1.2 GENERAL DESCRIPTION

The Kepco ABC Power Supply Series (Figure 1-1) consists of six single-output models as listed in Table 1-1. ABC Series Power Supplies can be operated from a wide range of a-c input power sources (85-265V a-c, 47 - 63Hz). Although ABC is a stand-alone, bench top design, rack mounting can also be accommodated by rack adapters available for standard 19-inch wide racks (see Figures 1-3 and 1-4). Load connections may be made either at front panel terminals, or at a barrier terminal strip located at the rear.

ABC Series Power Supplies employ high frequency switch-mode conversion and power factor correction. ABC Power Supplies are full-range, automatic-crossover voltage/current stabilizers with a full rectangular output characteristic. The ABC is controlled digitally over the entire voltage/current range. Voltage and current are displayed on a two-line alphanumeric LCD display. Control of the ABC can either be local (via the front panel keypad) or remote (via the IEEE 488.2 GPIB communication bus) using SCPI commands.

FIGURE 0-1.

SECTION 1 - INTRODUCTION

1.3 SPECIFICATIONS

Table 1-1 below indicates parameters that vary for different ABC models; Table 1-2 lists the Overcurrent and Overvoltage Range for each model. Table 1-3 lists general specifications that apply to all ABC models.

d-c OUTPUT RIPPLE AND NOISE (mv) (See PAR. 1.10) EFFICIENCY

MODEL

NUMBER

ABC 10-10DM0-100-101002425320 65%

ABC 15-7DM0-150-71053738420 66%

ABC 25-4DM 0-25 0-4 100 5 10 5 10 5 20 66%

ABC 36-3DM 0-36 0-3 108 7 15 7 15 7 20 67%

ABC 60-2DM 0-60 0-2 120 12 24 12 24 12 24 68%

ABC 125-1DM 0-125 0-1 125 25 50 25 50 25 50 70%

RANGE POWER

VOLTS AMPS WATTS TYP MAX TYP MAX TYP MAX % MIN

TABLE 1-2. MAXIMUM OVERVOLTAGE AND OVERCURRENT SETTINGS

MODEL NUMBER

TABLE 1-1. MODEL PARAMETERS

ABC

10-10DM

2x SOURCE

FREQUENCY

ABC

15-7DM

SWITCHING

FREQUENCY

ABC

25-4DM

36-3DM

SPIKE (50MHz)

ABC

60-2DM

100% LOAD

85-264V a-c

ABC

125-1DM

MAXIMUM OVERVOLTAGE SETTING 11V 17 27 39 65 137

MAXIMUM OVERCURRENT SETTING 11 7.7 4.4 3.3 2.2 1.1

ABCOPR012703

1-1

TABLE 1-3. ABC SPECIFICATIONS

SPECIFICATION RATING/DESCRIPTION

CONDITION

INPUT CHARACTERISTICS

a-c Voltage nominal 100/120/220/240V a-c Single phase

range 85-264V a-c Wide range

Frequency nominal 50-60Hz

range 47-63Hz (400Hz)

>63Hz Input leakage current

exceeds specifications

Current 85V a-c 1.8A

120V a-c 1.3A

240V a-c 0.65A

Maximum at 100W output

264V a-c 0.60A

Initial turn-on surge 5A peak for <150 usec 85-264V a-c, 0-100% load

Power Factor (min) 120V 0.99

240V 0.97

100% load

EMC immunity to: Radiated RF EN 61000-4-3 level 3

Magnetic Field EN 61000-4-8 level 4

Electrostatic discharge EN 61000-4-2 level 2: contact,

level 3: 8KV air discharge

Conducted RF EN 61000-4-6 level 3

Electrical fast transient EN 61000-4-4 level 3

Surges EN 61000-4-5 level 4

EMC Emissions Conducted EN 55022 Class B 0.15-30 MHz

Radiated EN 55022 Class B 30-1000 MHz

Harmonics Conducted EN 61000-3-2 0-2 KHz

Leakage current 120V a-c <0.25mA

240V a-c <0.5mA

Source frequency in

47-63Hz range

Circuit type PFC Flyback converter

Output Forward converter

Switching Frequency 100KHz

OUTPUT CHARACTERISTICS

Type of Stabilizer Automatic crossover Voltage/Current

Adjustment range 0 to 100% of rating Voltage/Current

Source effect Voltage <0.01% E

Current <0.01% I

Load effect Voltage <0.01% E

Current <0.02% I

Temperature effect Voltage <0.01% E

Current <0.01% I

Time effect Voltage <0.01% E

Current <0.01% I

Error sense 0.5V per wire Voltage allowance

Isolation voltage 500V d-c or peak Output to ground

max

Nominal ±15%

of input voltage

0 to 100% load change

Per degree C

(0 to 50° C)

0.5-8.5 hours

1-2

ABCOPR012703

TABLE 1-3. ABC SPECIFICATIONS (Continued)

SPECIFICATION RATING/DESCRIPTION

CONDITION

OUTPUT CHARACTERISTICS (Continued)

Programming time 2ms max 0-100%

Programming accuracy

Voltage <0.025% E

Current

0.1% I

0.05% I

max

max ABC 25-4DM

ABC 10-10DM

ABC 15-7DM

ABC 36-3DM

0.025% I

max

ABC 60-2DM

ABC 125-1DM

max

50-100% load change

return to 1% E

max

Readback/Display accuracy

Transient recovery to load change

Voltage <0.05% E

Current <0.1% I

Excursion <5% E

Recovery <200 usec

Overshoot None Turn ON/OFF

Data entry Local 24 keypads Front panel

Remote GPIB SCPI commands

GENERAL (ENVIRONMENTAL) CHARACTERISTICS

Temperature Operating 0° to +50° C No derating, 100% PO max

Operating +50° to +70° C Linear derating to 40% P

max

Storage -20° to +70° C

Humidity

0 to 95% RH

Shock 20g, 11msec ±50%

half sine

Vibration 5-10Hz 10mm

double amplitude

Non condensing

operating & storage

3-axes

3 shocks each axis

Non operating

1 hour each axis

Altitude Sea level to 10,000 feet

Cooling Natural convection

PHYSICAL CHARACTERISTICS

Dimensions English 7.9” x 4.9” x 14” ±1/32”

Metric 200.8 x 124.6 x 355.6 mm

±0.8 mm

Weight English 11 lbs.

Metric 5 Kg

A-C input connections

Front Panel ON/OFF switch

Rear Detachable IEC 320 type

connector

Output connections

Remote control programming

Digital display front panel

Front 5 binding posts

Rear 5 terminal barrier strips

One standard

GPIB connector

Voltage, current, mode, status, menu, program,

etc.

See Outline Drawing, Figure 1-2.

For rack mounting see

Figures 1-3 and 1-4.

Unpacked

3 wire fused

±Output, ±Sense, Ground

Rear,

SCPI & IEEE 488.2 Commands

2 x 16 character alphanumeric

LCD with LED backlight

ABCOPR012703

1-3

FIGURE 1-2. ABC SERIES POWER SUPPLY, MECHANICAL OUTLINE DRAWING

1-4

ABCOPR012703

FIGURE 1-3. ABC POWER SUPPLY AND RA 71 RACK ADAPTER, OUTLINE DRAWING

ABCOPR012703

1-5

FIGURE 1-4. TWO ABC POWER SUPPLIES AND RA 72 RACK ADAPTER, OUTLINE DRAWING

1-6

ABCOPR012703

1.4 LOCAL CONTROL

Front panel 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 be run once or cycled. Calibration of the unit is facilitated by a password -protected, menu-driven procedure from the front panel.

1.5 REMOTE CONTROL

The ABC Power Supply can be remotely controlled directly via the IEEE 488.2 (GPIB) bus using SCPI commands. All features available in local mode can also be accessed remotely. The unit is shipped with a VISA (Virtual Instrumentation Software Architecture) driver to facilitate remote programming of the ABC Power Supply. The VISA translates function calls made in standard C language to SCPI commands.

1.6 FEATURES

1.6.1 DIGITAL CALIBRATION

The ABC Power Supply contains no internal adjustments. Calibration is done entirely via the keypad using digital entries and a calibrated DVM and precision shunt resistor. Calibration instructions appear on the front panel after a password is entered; previous calibration values are saved and can be restored if desired. The original factory calibration values can also be restored. (Refer to Section 4.)

1.6.2 OVERVOLTAGE/OVERCURRENT PROTECTION

Overvoltage and Overcurrent protection values can be individually programmed. The maximum values are listed in Table 1-2. Refer to PAR. 3.2.9.

1.6.3 PROGRAMMABLE OVERVOLTAGE/OVERCURRENT DELAY

Changing the output settings may cause large output transients (common with reactive loads) that can trip the overvoltage/overcurrent protection. The ABC can be programmed to delay tripping of overvoltage/overcurrent protection when output settings are changed to avoid inadvertent tripping. After the delay, the programmed overcurrent/overvoltage setting is effective. Protection can be delayed up to approximately 8 seconds after the output settings are changed. Refer to PAR. 3.2.10.

1.6.4 NON-VOLATILE STORAGE OF PROGRAMMED SEQUENCES OR ACTIVE SETTINGS

The ABC Power Supply contains 40 memory locations that can be used either to preprogram a sequence of output values or to store the 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 non-volatile memory, and are retained when the unit is turned off. Refer to PAR. 3.2.12.

The same 40 memory locations are also available to save the active programmed settings (V SET, I SET, OV SET and OC SET). The saved setting can be recalled by specifying the memory location.

ABCOPR012703

1-7

1.6.5 USER-DEFINED VOLTAGE/CURRENT LIMITS

The ABC output can be programmed not to exceed user-defined values. For example, the ABC 10-10DM, which has a maximum capacity of 10V, 10A, can be limited to 5.5V, 1A for working with circuitry that might be damaged by higher levels. Once the limits are set, the power supply becomes, in effect a 5.5V,1A supply and values exceeding the limit values will not be accepted. Refer to PAR. 3.2.11.

1.7 EQUIPMENT SUPPLIED

The unit is shipped with a standard Power Cord, IEC to 115 VAC (USA),

1.8 ACCESSORIES

Accessories for the ABC Power Supply are listed in Table 1-4.

TABLE 1-4. ACCESSORIES

ITEM FUNCTION

Rack Adapter Accepts a single ABC power supply for installation in

a 19-inch wide rack (see Figure 1-3).

Rack Adapter Accepts a two ABC power supplies for side by sided

installation in a 19-inch wide rack (see Figure 1-4).

IEEE 488 Cable, (1 meter long) Connects ABC power supply to GPIB bus SNC 488-1

IEEE 488 Cable, (2 meter long) Connects ABC power supply to GPIB bus SNC 488-2

IEEE 488 Cable, (4 meter longs) Connects ABC power supply to GPIB bus SNC 488-4

Fuse Circuit Protection (Replacement of Fuse A2FS1 is

authorized by service personnel only.)

1.9 SAFETY

There are no operator serviceable parts inside the case. Service must be referred to authorized personnel. Using the power supply in a manner not specified by Kepco. Inc. may impair the protection provided by the power supply. Observe all safety precautions noted throughout this manual. Table 1-5 lists symbols used on the power supply or in this manual where applicable.

TABLE 1-5. SAFETY SYMBOLS

SYMBOL Meaning

WARNING: RISK OF ELECTRIC SHOCK.

PART NUMBER

RA 71

RA 72

IEC TYPE T,

3.15A, 250V a-c

1-8

WARN ING

CAUTION

CAUTION: REFER TO REFERENCED PROCEDURE.

INDICATES THE POSSIBILITY OF BODILY INJURY OR DEATH.

INDICATES THE POSSIBILITY OF EQUIPMENT DAMAGE.

ABCOPR012703

1.10 RIPPLE/NOISE MEASUREMENT

To accurately verify that ABC Power Supply ripple and noise parameters are within the specification limits listed in Table 1-1, speciaized test cables are required (not supplied). Figure 1-5 illustrates the requirements for two cables, one for ripple measurement and one for spike measurement.

ABCOPR012703

FIGURE 1-5. RIPPLE AND SPIKE MEASUREMENT CABLES

1-9/(1-10 Blank)

SECTION 2 - INSTALLATION

2.1 UNPACKING AND INSPECTION

This instrument has been thoroughly inspected and tested prior to packing and is ready for operation. After careful unpacking, inspect for shipping damage before attempting to operate. Perform the preliminary operational check as outlined in PAR. 2.5. If any indication of damage is found, file an immediate claim with the responsible transport service.

2.2 TERMINATIONS AND CONTROLS

a) Front Panel: Refer to Figure 2-1 and Table 3-1.

b) Rear Panel: Refer to Figure 2-2 and Table 2-1.

ABC 012703

FIGURE 2-1. ABC SERIES FRONT PANEL

FIGURE 2-2. ABC SERIES REAR PANEL

2-1

TABLE 2-1. INPUT/OUTPUT PIN ASSIGNMENTS FOR REMOTE CONTROL

CONNECTOR PIN SIGNAL NAME FUNCTION

I/O Line

IEEE 488

PORT

5 EOI End or Identify

6DAV Data Valid

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

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

2.3 SOURCE POWER REQUIREMENTS

This power supply operates from single phase a-c mains power over the specified voltage and frequency ranges (Table 1-3) without any need for range selection.

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 convection. Periodic cleaning of the power supply interior is recommended. If the power supply is located 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 1-3).

2.5 PRELIMINARY OPERATIONAL CHECK

A simple operational check after unpacking and before equipment installation is advisable to ascertain whether the power supply has suffered damage resulting from shipping.

Refer to Figures 2-1 and 2-3 for location of operating controls and electrical connections. Tables 3-1 and 3-2 explain the functions of operating controls/indicators and keypad keys, respectively.

2-2

ABC 012703

1. With POWER switch set to off position, connect the power supply to source power.

2. With no load connected, set POWER switch to the ON position. Each time the unit is turned on and an internal self-test is performed. If the test is successful the indications of step 3 are visible.

3. The alphanumeric display (LCD) indicates the model and GPIB address. After approximately 2 seconds, the display changes to the power on default values: Local mode, Constant Voltage (CV) mode, 0.000V, 0.000A, output enabled, command entry status (see Figure 2-3). Overcurrent and Overvoltage protection are set to the maximum values (Table 1-2), but are not displayed.

Loc CV

0.000A0.000V

NOTE: indicates blinking colon (:), Command Entry status

indicates blinking equal sign (=), Data Entry status

FIGURE 2-3. LCD POWER ON DEFAULTS

NOTE: Six keys with dual functions are labeled with both a command and a number. The com-

mand label is referred to when the unit is in command entry status; the number is referred to when the unit is in data entry status.

4. Press VSET key. Verify bottom line of LCD reads Vset nn (where nn = voltage setting).

5. Connect a digital voltmeter (DVM) to the (+) and (–) terminals at either the front or rear panel.

6. Use number keys to enter rated maximum voltage (e.g. for ABC 25-4DM, 25V is the rated maximum voltage) and press ENTER. Output voltage will be displayed at bottom left of LCD.

7. Use

2.6 INSTALLATION

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 keypad and LCD display. For rack mounting, refer to Figures 1-3 and 1-4.

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.

and Í keys as necessary to adjust output precisely to rated maximum voltage. Verify DVM voltage reading agrees with displayed voltage on LCD within 0.01% of rated maximum (see Table 1-3). If the LCD reads VsetMAX= (value), you are entering a value higher than the maximum voltage setting; see PAR. 3.2.11.

ABC 012703

2-3

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 2-2) is connected to the ABC 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. See Table 1-3 for source power specifications.

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 “noise 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, 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.

2-4

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 ABC 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

ABC 012703

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 have a finite shunt impedance which decreases with frequency. The method of interface between the power supply output and the load must, therefore, take into account not only the size with regard to minimum voltage drop, but the configuration with regard to minimizing the impedance introduced by practical interconnection techniques (wire, bus bars, etc.). The series inductance of the load wire must be as small as possible as compared to the source inductance of the power supply: although the error sensing connection to the load compensates for the d-c voltage drop in the power leads, it cannot compensate for the undesirable output effects of the power lead inductance. These lead impedances (both power and sensing leads) are especially important if the load: is constantly modulated or step-programmed; 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 ABC power supply are achieved via the (+) and (–) binding posts located on the front panel. A barrier strip is provided at the rear panel for connection to the load (system applications).

NOTE REGARDLESS OF OUTPUT CONFIGURATION, OUTPUT SENSE LINES MUST BE

CONNECTED FOR OPERATION.

1. OBSERVE POLARITIES: The OUTPUT +S sensing wire must be connected to the

OUTPUT + load wire, and the OUTPUT –S sensing wire must be connected to the OUTPUT – load wire.

2. IF LOCAL SENSING IS USED, INSTALL LINKS (see Figures 2-4 and 2-5). Links may be installed at either the front or rear terminals, but not both (installing links at both the front and rear will degrade power supply performance).

ABC 012703

2-5

2.7.6 LOAD CONNECTION USING LOCAL SENSING

Figure 2-4 shows a typical configuration using local sensing and a grounded load; Figure 2-5 shows a typical configuration using local sensing with an isolated (“floating”) load.

FIGURE 2-4. GROUNDED LOAD CONNECTIONS, LOCAL SENSING

2-6

FIGURE 2-5. ISOLATED LOAD CONNECTIONS, LOCAL SENSING

ABC 012703

2.7.7 LOAD CONNECTION USING REMOTE SENSING

Figure 2-6 shows a typical configuration using remote sensing and a grounded load; Figure 2-7 shows a typical configuration using remote sensing with an isolated (“floating”) load.

FIGURE 2-6. GROUNDED LOAD CONNECTIONS, REMOTE SENSING

FIGURE 2-7. ISOLATED LOAD CONNECTIONS, REMOTE SENSING

2.8 OPERATING CONFIGURATION

ABC 012703

The operating configuration can be determined by pressing MENU nine times (with the unit in command entry status). The LCD top line reads ABC-VVAA (VV is Vmax, AA is Imax, e.g., for the ABC 125-1DM, top line reads 1251). The LCD bottom line displays a 6-digit number (factory calibration date) followed by a 3-digit number, followed by the firmware version number.

2-7/(2-8 Blank)

SECTION 3 - OPERATION

3.1 GENERAL

This section explains how to operate the ABC Power Supply. The power supply can be operated either in Local mode using the front panel keypad and LCD, or in Remote mode using SCPI commands via the GPIB bus. Operation in remote mode can be simplified by the use of the VISA driver supplied with the power supply.

Local mode operation includes a description of the interaction between the LCD and the front panel keypad. Each key of the front panel is described, with a reference to a paragraph detailing the use of that key.

3.2 LOCAL MODE OPERATION

Local operation of the ABC Power Supply is accomplished via the 24 key keypad on the front panel. All indications are provided by the 2-line LCD.

3.2.1 FRONT PANEL KEYPAD AND LCD (SEE FIGURE 2-1)

The front panel keypad is comprised of 24 key, 13 dedicated to command functions, 5 dedicated to data functions, and 6 keys that have both command and data functions When the power supply is in command entry status the command functions are effective; when the power supply is in data entry status the data functions are effective.

3.2.1.1 COMMAND ENTRY STATUS

Indicated by blinking colon (:) on bottom line of LCD; the power supply is waiting for a command to be entered; data will not be accepted (accompanied by brief audible buzz). The LCD indicates the actual voltage and current at the output terminals. When the output is disabled (LCD bottom line reads Output OFF), the power supply is in Command entry status even though the blinking colon is not visible.

NOTE: The blinking colon is indicated by in this manual.

3.2.1.2 DATA ENTRY STATUS

Indicated by blinking equal sign (=) on bottom line of LCD; the power supply is waiting for data to be entered. A command will not be accepted (accompanied by brief audible buzz). Enter new value (the key erases data entered). Press ENTER to accept new setting, or CLEAR to exit without changing setting.

NOTE: The blinking equal sign is indicated by in this manual.

3.2.1.3 DISPLAY (LCD)

The LCD is a 2-line display with a capacity of 16 characters per line. The information is generally arranged as follows (information that does not follow this format is self-explanatory).

• Top left: Loc/Rem/Rwl Local/Remote/Keypad locked Status (See PAR. 3.2.3 )

ABC 012703

• Top right CV/CC Constant voltage mode/constant current mode

3-1

• Bottom left: In command entry n.nnnV Output voltage In data entry: (parameter) e.g. OVset if OV SET key was pressed.

• Bottom middle: Command entry status

• Bottom right: In command entry n.nnnA Output current In data entry: n.nnn Present value of parameter, replaced by

3.2.1.4 KEYPAD FUNCTIONS

Keypad functions are listed in Table 3-1. Six keys have dual functions, depending on whether the power supply is in command entry status (waiting for a command to be entered), or data entry status (waiting for a number to be entered). Command entry status is indicted by a blinking colon and data entry status is indicated by a blinking equal sign .

NOTE: Keys with dual functions are labeled with both a command and a number. The com-

mand label is referred to when the unit is in command entry status; the number is referred to when the unit is in data entry status.

Data entry status

data entered

TABLE 3-1. KEY FUNCTIONS

KEY

OUTPUT

ON/OFF

V SET Command Entry

I SET Command Entry

LOCAL Command Entry

RESET Command Entry

MENU Command Entry

OV SET

POWER SUPPLY STATUS ACTIVE

Command Entry

Data Entry

DESCRIPTION

If bottom line of LCD reads Output OFF, press to enable the output. If output is on (voltage and current measurements displayed on bottom line of LCD), press to disable the output.

Press to set output voltage. After V SET is pressed, previous setting is displayed. Data entry required to enter new value of output voltage; press ENTER to accept displayed value.

Press to set output current. After I SET is pressed, previous setting is displayed. Data entry required to enter new value of output current; press ENTER to accept displayed value.

If the power supply is in remote mode, keypad is disabled except for LOCAL key. Press to enable keypad. If LCD reads KEYPAD LOCKED, The LOCAL key is disabled and can only be unlocked by remote operation.

Press to restore the power on default values: CV mode, output voltage = 0, output current = minimum (1-2% of I and overcurrent values per Table 1-2. Also resets overvoltage or overcurrent condition.

Press to enter Menu commands: press repeatedly to scroll through Menu functions: (1) set LCD contrast, (2) GPIB address, (3) DCL Control, (4) Power-Up Digital DC Output on/off, (5) Speaker on/off, (6) Calibration password, (7) previous calibration values, (8) factory calibration values, (9) view firmware serial number, (10) set maximum voltage, (11) set maximum current, (12) protection delay. Press ENTER or RESET to exit Menu.

Press to set overvoltage protection value. Data entry required to enter the overvoltage protection value; press ENTER to accept displayed value.

Press to enter number 7. 3.2.1.2

), output enabled, overvoltage

Omax

REFERENCE

PARAGRAPH

3.2.6

3.2.8

3.2.3

3.2.7

(1) 3.2.4, (2) 3.3.3, (3) 3.3.2, (4) 3.2.6.1 (5) 3.2.5, (6) 4.4, (7) 4.5, (8) 4.6 (9) 2.8, (10, 11) 3.2.11 (12) 3.2.10,

3.2.9

3-2

ABC 012703

TABLE 3-1. KEY FUNCTIONS (CONTINUED)

KEY

OC SET

CALIB

STORE Command Entry

EDIT PROG Command Entry

STEP

TIME

RUN

POWER SUPPLY STATUS ACTIVE

Command Entry

Data Entry

Command Entry

Data Entry

Command Entry

Data Entry

Command Entry

Data Entry

Command Entry

Data Entry

DESCRIPTION

Press to set overcurrent protection value. Data entry required to enter new overcurrent protection value; press ENTER to accept displayed value.

Press to enter number 8. 3.2.1.2

Press to enter Calibration status. Requires password entry; instructions appear on LCD.

Press to enter number 9. 3.2.1.2

Press to store present values of output voltage and current and overvoltage and overcurrent protection. Data entry required to select memory location where values are to be stored

Press to select the starting memory location to be edited. Then use or

to view or modify the parameters of a specific memory location or to

create a new program.

Press to select starting address of program to be executed one step at a time.

Press to enter number 4. 3.2.1.2

Press to edit time value for specific memory location. Select memory location (data entry), then enter time value, 0.01 to 300 seconds (data entry).

Press to enter number 5. 3.2.1.2

Press to run a program. Requires data entry to select starting location. Press ENTER to accept displayed value.

Press to enter number 6. 3.2.1.2

REFERENCE

PARAGRAPH

3.2.9

4.3

3.2.12

3.2.14.1

3.2.14.3

3.2.14.1

3.2.14.2

RECALL Command Entry

CLEAR Data Entry

1 Data Entry

2 Data Entry

3 Data Entry

ENTER Data Entry

Command Entry

Data Entry

0 Data Entry

( . ) Data Entry

Press to recall previously stored values of output voltage and current, and overvoltage and overcurrent protection. Data entry required to select memory location containing values to be recalled; press ENTER to accept displayed value.

Press to exit Data Entry status; any numbers entered are lost. Restores Command Entry status

Press to enter number 1. 3.2.1.2

Press to enter number 2. 3.2.1.2

Press to enter number 3. 3.2.1.2

Press to accept data entered and return to Command Entry status. 3.2.8

— In CV (constant voltage), press to decrease output voltage by increment equal to voltage resolution ( — In CC (constant current), press to decrease output current by increment equal to current resolution ( — In EDIT PROG status, changes the parameter displayed on LCD for a specific memory location and decrements memory location displayed on LCD.

Erases number to left, or decreases value shown (e.g. Display Contrast setting).

Press to enter number 0. 3.2.1.2

Press to enter decimal point 3.2.1.2

≤

.0.025% of EOmax).

≤

.0.025% of IOmax).

3.2.13

3.2.8

3.2.8, 3.2.14.1

3.2.8

ABC 012703

3-3

TABLE 3-1. KEY FUNCTIONS (CONTINUED)

KEY

POWER SUPPLY STATUS ACTIVE

Command Entry

Data Entry

— In CV (constant voltage), press to increase output voltage by increment equal to voltage resolution ( — In CC (constant current), press to increase output current by increment equal to current resolution ( — In EDIT PROG status, changes the parameter displayed on LCD for a specific memory location and increments memory location displayed on LCD

Not used. —

3.2.2 TURNING THE POWER SUPPLY ON

When the power supply is turned on, it performs a self-test and displays the status in the LCD. After completing the self-test the LCD first shows the power supply type, e.g., Kepco ABC10- 10 GPIB addr. = nn, where nn is the GPIB address (factory default GPIB address = 6).The LCD then shows the power on defaults (see Figure 3-1). The defaults are: output enabled, voltage mode, output voltage set to zero, output current set to a minimum value (1-2% of I Power on defaults also include setting maximum values for overcurrent and overvoltage protection indicated in Table 1-2.

NOTE: The power supply can be programmed to power up with output set to OFF. See PAR.

3.3.2 and Appendix B, PAR. B.89.

DESCRIPTION

≤

.0.025% of EOmax).

≤

.0.025% of IOmax).

REFERENCE

PARAGRAPH

3.2.8, 3.2.14.1

max).

Loc CV

NOTE: indicates blinking colon (:), Command Entry status

indicates blinking equal sign (=), Data Entry status

Depressing any key on the keypad during the power up sequence will cause the power supply to enter the keypad test. To return to normal operation, follow the prompts, depressing keypad keys as indicated on the LCD.

3.2.3 SETTING LOCAL MODE

When the power supply is turned on, it is automatically set to Local mode. If remote commands are accepted over the GPIB bus, the power supply will automatically go into Remote mode (Rem at the upper left of the LCD). Pressing the LOCAL key will restore Local mode. When in Remote mode, all keys except LOCAL are disabled.

The ABC incorporates a “keypad lockout” command which allows the LOCAL key to be disabled during remote operation, preventing inadvertent setting of the power supply to Local mode. When the keypad is locked, the LCD displays Rwl in place of LOC. If the keypad is

0.000A0.000V

FIGURE 3-1. LCD POWER ON DEFAULTS

3-4

ABC 012703

locked, it must be unlocked either by a remote command (see Appendix B, PAR. B.81), or cycling the power supply off then on.

3.2.4 ADJUSTING LCD CONTRAST

With the power supply in command entry status , press MENU key. Press or key to increase or decrease contrast for optimum viewing. The contrast can also be set directly by entering a number from 1 to 9. Press ENTER or CLEAR to exit menu.

3.2.5 ENABLING/DISABLING AUDIBLE BEEPS

With the power supply in command entry status , press MENU key five times. The top line indicates if the speaker is on or off (the factory default setting is speaker on). Enter 1 to enable the speaker, or 0 to disable the speaker. Press ENTER or CLEAR to exit menu.

3.2.6 ENABLING/DISABLING DC OUTPUT POWER

When the power supply is turned on, the output is automatically enabled, and the bottom line of the LCD gives voltage and current measurements at the output. To disable the output, press the red OUTPUT ON/OFF key; the lower line of the LCD reads: Output OFF. When the output is disabled, voltage and current are programmed to zero; the power supply remains in Command Entry status. Pressing the OUTPUT ON/OFF key again enables the output: the previously programmed values of voltage and current are restored and the LCD displays the mode (CV or CC) and actual values of output voltage and current.

3.2.6.1 POWER UP DIGITAL DC OUTPUT CONTROL

The output of the power supply can be programmed to be either enabled or disabled upon power-up. With the power supply in command entry status (:_:_:), press the MENU key four times. The top line indicates whether the Digital DC Output will be on (enabled) or off (disabled) upon power-up. Press 1 to enable the Digital DC Output upon power up. This sets the output to zero volt and current to the Power-up value. Press 0 to disable the output upon power up. Press

CLEAR or RESET to exit menu and return to command entry status.

3.2.7 RESET

RESET overrides all other local commands to reset the power supply to the power on defaults:

output enabled, voltage mode, output voltage set to zero, output current set to a minimum value (1-2% of I

max), overcurrent and overvoltage protection set to the maximum values per Table

1-2. The power supply remains in command entry status.

3.2.8 SETTING OUTPUT VOLTAGE OR CURRENT

V SET and I SET set output voltage and current limit, respectively, when the unit is in constant

voltage (CV) mode and set voltage limit and output current, respectively, when the unit is in constant current (CC) mode. The mode (CV or CC) is determined by the load together with the programmed settings. As long as the voltage across the load produces a current that is less than or equal to the I SET value, the unit operates in CV mode (voltage programmed to V SET value, current limited by I SET value). If the load changes to the point that current through the load reaches the I SET value, the unit automatically enters CC mode (current programmed to I SET value, voltage limited by V SET value).

ABC 012703

With the power supply in command entry status , press V SET (voltage) or I SET (current) key to put the power supply in data entry status . The lower right side of the LCD shows the programmed setting in effect when the key is pressed. Press ENTER or CLEAR to exit without

3-5

changing setting. Enter new value (the key erases data just entered) and press ENTER to accept new setting or CLEAR to exit witrhout changing setting.

With the power supply in command entry status , an alternative is to use (increase) or key (decrease) to change the output by the minimum increment (≤

age, ≤

0.025% of IOmax for current). In CC mode, these keys control output current; in CV mode they control output voltage. The and keys have no effect after the maximum (or programmed limit) has been reached.

If the value entered exceeds the maximum setting, the LCD bottom line flashes VsetMAX=nn V or IsetMAX=n.n A where n.n is the maximum setting (see PAR.3.2.11). The unit returns to waiting for a value that does not exceed the maximum.

3.2.9 SETTING OVERVOLTAGE OR OVERCURRENT PROTECTION

With the power supply in command entry status , press OV SET (overvoltage) or OC SET (overcurrent) to put the power supply in data entry status . The lower right side of the LCD shows the programmed setting in effect when the key is pressed. Press ENTER or CLEAR to exit without changing setting. Enter new value and press ENTER to accept new setting (the key erases data just entered), or CLEAR to exit without changing setting. To recover from overvoltage or overcurrent condition, press RESET; this restores the power on defaults (see PAR.

3.2.7).

3.2.10 CHANGING PROTECTION DELAY

0.025% of EOmax for volt-

The overvoltage and overcurrent protection normally trips immediately upon detection of an overvoltage/overcurrent condition. However, changing output settings (particularly with reactive loads) large transients can cause inadvertent tripping of the protection. For this reason, tripping of the overvoltager/overcurrent protection can be delayed approximately 8 seconds after the output is changed.

With the power supply in command entry status , press MENU key twelve times. LCD reads Prot. Delay Count nn where nn is the active setting. A count of 0 means no delay, a count of 255 (highest value) means approximately 8 seconds delay (a count of 30 provides a delay of 1 second).

3.2.11 CHANGING MAXIMUM VOLTAGE OR CURRENT VALUE

The maximum values of voltage and current are determined by the model, e.g., 25V and 4A for the ABC 25-4DM. These values can be lowered by the user, e.g., to prevent inadvertent damage to a specific circuit under test. Changing the maximum values of the ABC 25-4DM to 10V and 1A, effectively makes the unit a 10V 1A power supply.

With the power supply in command entry status , press MENU key ten (voltage) or eleven (current) times. The LCD reads New MAXIMUM Vset (or Iset) nn where nn is the maximum value setting to be changed. Press ENTER or CLEAR to exit menu without changing setting. Press number keys to enter new value and press ENTER. Press ENTER again to exit the menu and return to command status .

If a value is entered that is higher than the rated maximum for the power supply, the bottom line of the LCD flashes Vset or Iset MAX = nn where nn is the rated maximum of the power supply. The unit remains in data entry status waiting for a value equal to or less than the rated maximum. Press CLEAR to exit without changing the value.

3-6

ABC 012703

Once the maximum value has been changed, if a value higher than the new maximum is attempted to be programmed, the LCD flashes Vset (or Iset) MAX = nn where nn is the pro- grammed maximum.

NOTE: If the programmed output value is higher than the new maximum value established

with the MENU key, the output will be limited to the new maximum value.

3.2.12 STORING POWER SUPPLY OUTPUT SETTINGS

The programmed settings of voltage, current, overvoltage protection and overcurrent protection can be stored in one of the 40 memory locations available for local programming (see PAR.

3.2.14).

With the power supply in command entry status , press STORE key. The LCD reads STORE mem nn where nn is the memory location where the settings are to be stored. Press ENTER or CLEAR to exit without changing setting. Enter memory location (from 1 to 40) and press ENTER. The programmed voltage, current, overvoltage protection and overcurrent protection settings in effect when ENTER is pressed are stored in the selected memory location. To recall stored settings, see PAR. 3.2.13

3.2.13 RECALLING STORED OUTPUT SETTINGS

With the power supply in command entry status , press RECALL. The LCD reads RECALL mem nn where nn is the memory location holding the settings to be retrieved. Press ENTER

or CLEAR to exit without changing setting. Enter memory location (from 1 to 40) and press ENTER. The stored settings for voltage, current, overvoltage protection and overcurrent protec-

tion replace the current values, and the unit returns to command entry status.

3.2.14 LOCAL MODE PROGRAMMING OF THE POWER SUPPLY.

Local mode programming offers the user 40 memory locations that can be used to program the power supply. Each location defines values for output voltage, output current, overcurrent protection, overvoltage protection, time duration (between 0.1 and 300 seconds) for the programmed settings, and the address of the next memory location in the program.

3.2.14.1 CREATING OR MODIFYING A PROGRAM (PROGRAM EDIT MODE)

Creating a program and modifying an existing program are identical except that a program modification requires only selected parameters to be changed rather than all new parameter values. With the power supply in command entry status , press EDIT PROG key. The top line indicates the STARTaddr. nn, where nn is one of 40 memory location. To select a different address, enter new value and press ENTER.

The top line of the LCD indicates the active memory location, e.g. ViewVAL Mem <n> where n is the memory location previously chosen. The bottom line of the LCD indicates the parameter on the left (Iset, Vset, OVset, OCset, TIMEval, NEXT STEP), the parameter’s value on the right, and data entry status in the middle. To modify time values see PAR.3.2.14.1.1.

Press ENTER to accept displayed value, or enter new value and press ENTER to accept new setting (the LCD displays the next parameter). Press CLEAR to exit Program Edit mode without changing value. Use or key to scroll forward (or backward) to view next (or previous) parameter or memory location. For a program to run once, then stop, see PAR. 3.2.14.6; to cycle a program continuously, see 3.2.14.4. After all program values have been set, press CLEAR or ENTER to exit Program Edit mode. Setting up a program can be made easier by

ABC 012703

3-7

copying the Memory Location Worksheet (Table 3-2) and filling in the values before programming the power supply.

3.2.14.1.1 MODIFYING PROGRAMMED TIME INTERVAL

The TIME key offers a quick and easy way to change the time for any memory location. With the power supply in command entry status , press TIME key. The unit displays TIME @ mem = 01 indicating the current step to be changed. To change a different step, enter the step number using the numeric keys. To proceed, depress ENTER. The LCD displays TIMEval = nn where nn is the time value set for the selected location. Press ENTER to accept displayed value, or enter new value (between 0.01 and 300 seconds) and press ENTER to accept new value or press CLEAR to exit without changing value. The unit returns to command entry status . Refer to PAR. 3.2.14.1.2 if accuracy of time values is important.

3.2.14.1.2 TIME INTERVAL ACCURACY

The accuracy of the time interval is +5% (specified time interval may be exceeded by a maximum of 5%).

3.2.14.2 RUNNING A PROGRAM

With the power supply in command entry status , press RUN key. The LCD bottom line indicates the start address of the program. Press ENTER key to run the program starting with that address. To change the starting address, enter new value and press ENTER to run the program. Press CLEAR to exit without running the program

3.2.14.3 STEPPING THROUGH A PROGRAM

The STEP function is useful for examining a program that has just been created or edited before running in real-time. With the power supply in command entry status , press STEP key. The LCD bottom line indicates the start address of the program; press ENTER to begin stepping at that address. To change the starting address, enter new value and press ENTER to begin stepping at the new address, press CLEAR to exit without stepping through the program.

The LCD top line shows LOC to indicate local mode, aa bb where aa is the memory location just executed, bb is the NEXT STEP location, and shows CV (constant voltage) or CC (constant current) to indicate the actual operating mode. The LCD bottom line shows the output voltage and current measurements for the location just executed, and indicates command status. Press STEP to execute location bb. The LCD will again display the location just executed, voltage and current measurements, and the NEXT STEP location. Continue to press STEP to execute the program one step at a time, or press CLEAR to exit Step function.

3.2.14.4 CYCLING A PROGRAM

To cycle a program, modify the program (see PAR. 3.2.14.1) and go to the last memory location to be executed and set the NEXT STEP address to the Starting address, causing the program to loop and repeat indefinitely. For example, if the last location is 14, and the starting location is 05, press EDIT PROG, enter 14, then press ENTER. Press until LCD reads ViewVAL Mem14 NEXT STEP . Enter 5 and press ENTER. When the program runs, it will start at location 05, continue to 14, then loop back to the location 05, and repeat indefinitely.

3-8

ABC 012703

TABLE 3-2. MEMORY LOCATION WORKSHEET

MEMORY

LOCATION

I SET

(Current)

(A)

V SET

(Voltage)

(V)

OCset

(Overcurrent

Protection)

(A)

OV set

(Overvoltage

Protection)

(V)

TIMEval

(0. to 300 Sec)

(Sec)

NEXT STEP

(Next location

to execute)

ABC 012703

3-9

3.2.14.5 RUNNING A PROGRAM ONCE

To set up a program to stop after running once, modify the program (see PAR. 3.2.14.1) and go to the last memory location to be executed and set the NEXT STEP address to 0. For example, with the power supply in command entry status , press EDIT PROG. Enter the last memory location you want executed (e.g. 14), then press ENTER. Press key until LCD reads ViewVAL Mem14 NEXT STEP . Enter 0 and press ENTER. The program will now stop after memory location 14 is executed. When the program stops, the power supply will continue to provide the output specified by the last location (in the above example, location 14).

3.2.14.6 STOPPING A PROGRAM

To set up a program to stop after running once, set the NEXT STEP address of the last memory location to be executed to 0. For example, with the power supply in command entry status , press EDIT PROG. Enter the last memory location you want executed (e.g. 14), then press

ENTER. Press key until LCD reads ViewVAL Mem14 NEXT STEP . Enter 0 and press ENTER. The program will now stop after memory location 14 is executed.

3.2.14.7 STOPPING A RUNNING PROGRAM

There are three ways to stop a program that is running:

• Press CLEAR key: the program immeditately stops at the step (location) that was being executed when the key was pressed. The power supply output remains at the values specified by that step.

• Press RESET key: The program stops and power on defaults are restored (see PAR.

3.2.7).

• Press OUTPUT ON/OFF key: the output is disabled (programmed to zero) and the program immeditately stops at the step (location) that was being executed when the key was pressed. Pressing the OUTPUT ON/OFF key again restores the output to the values specified by the step in effect when the program was stopped.

3.2.14.8 SAMPLE PROGRAM

Table 3-2 shows a sample program designed to cycle continuously; if the NEXT STEP value for location 3 is set to 00, the program will run once and stop.

TABLE 3-3. SAMPLE PROGRAM (MODEL ABC 10-10DM)

MEMORY

LOCATION

1 2.1 4.3 11 11 1.5 02

2 1.2 5.0 1.3 5.2 1.8 03

3 4.5 6.2 4.8 6.4 1.0 01

I SET

(Current)

(A)

V SET

(Voltage)

(V)

OCset

(Overcurrent

Protection)

(A)

OV set

(Overvoltage

Protection)

(V)

TIMEval

(0. to 300)

(Sec)

NEXT STEP

(Next location

to execute)

3.2.15 CALIBRATION

See Section 4.

3-10

ABC 012703

3.3 REMOTE MODE PROGRAMMING

ABC Power Supplies may be programmed over a control bus using SCPI (Standard Commands for Programmable Instruments). SCPI provides a common language conforming to IEEE 488.2 for instruments used in an automatic test system. The control bus used must be the IEEE 488 standard communication bus (General Purpose Interface Bus, GPIB). Refer to Table 2-1 for input/output signal allocations.) Most power supply functions available from the keypad can be programmed via remote commands, in addition to some that are not available from the keypad (e.g. triggering, and local lockout).

This section includes a discussion of GPIB bus protocols (PAR. 3.3.1), instructions for changing the GPIB address (PAR. 3.3.3), a discussion of the VISA (Virtual Instrumentation Software Architecture) driver supplied with the unit (PAR. 3.3.4), followed by a detailed explanation of SCPI programming (PAR. 3.4)

3.3.1 IEEE 488 (GPIB) BUS PROTOCOL

Table 3-4 defines the interface capabilities of the ABC power supply (Talker/Listener) relative to the IEEE 488 (GPIB) bus (reference document ANSI/IEEE Std 488: IEEE Standard Digital Interface for Programmable Instrumentation) communicating with a Host Computer—Controller (Talker/Listener). Tables 3-5 and 3-6 define the messages sent to the ABC, or received by the ABC, 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 ABC power supply operating as either a Talker or a Listener.

TABLE 3-4. 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 e r 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 DT1 Respond to *TRG and <GET> trigger functions.

SUBSET

SYMBOL

COMMENTS

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 ABC executes front panel commands, but can be set to remote mode via IEEE 488 bus. When in Remote mode all front panel keys are disabled except LOCAL. LOCAL key can be disabled using keypad lockout command (see Appendix B, PAR. B.81) so that only the controller or a power on condition can restore Local mode.

Complete Capability. ABC accepts DCL (Device Clear) and SDC (Selected Device Clear).

ABC 012703

Controller C0 No Capability

3-11

TABLE 3-5. IEEE 488 (GPIB) BUS COMMAND MODE MESSAGES

MNEMONIC

ATN Attention Received

DAC Data accepted Received or Sent

DAV Data Valid Received or Sent

DCL Device Clear Received (see PAR. 3.3.2)

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

MESSAGE

DESCRIPTION

COMMENTS

TABLE 3-6. IEEE 488 (GPIB) BUS DATA MODE MESSAGES

MNEMONIC MESSAGE DESCRIPTION COMMENTS

DAB

END

EOS

RQS

STB

3.3.2 DCL CONTROL

The device clear (DCL) and selected device clear can be set to operate in two modes. In the “output = 0V” mode, when the device clear is received, the output of the power supply is set to zero volts. In the “output unchanged” mode sending DCL or selected DCL has no effect on output voltage and current as required by IEEE specification 488.2. The factory default value is “output unchanged” mode. NOTE: When set to “output = 0V” mode, the power supply will power up with OUTPUT set to OFF.

3-12

Data Byte Received or Sent

End Received or Sent

End of String Received or Sent

Request Service Sent

Status Byte Sent

ABC 012703

To change the DCL mode the unit must be in command entry mode , then depress the MENU key three times. The top line of the display will show the current setting: either DCL sets

OUTP=0V or DCL = OUTP UNCHNG. The bottom line of the display reads depress 1 to toggle. Depressing 1 toggles the DCL mode and updates the displayed message. Depressing

the RESET key leaves the mode unchanged. Depressing 0, ENTER, or MENU updates the DCL mode and displays the next selection.

3.3.3 CHANGING THE GPIB ADDRESS

When the power supply is in local mode, command entry status , press MENU key twice. The top line of the LCD indicates the current GPIB address. Enter new value and press ENTER to accept new setting, or CLEAR to exit without changing setting.

3.3.4 ABC VISA INSTRUMENT DRIVER

The VISA instrument driver supplied with the ABC Power Supply is provided to simplify programming with a VISA compatible GPIB controller. Included on the diskette are:

• source code (C) for all VISA functions (kp_abc.c)

• a complete programming reference manual (kp_abc.doc)

• a sample application of the VISA functions (written in C) which can be used to program one or more ABC power supplies using a virtual front panel observed on a computer monitor (kp_appl.c)

Although the software drivers supplied by Kepco are VISA compliant, they also require the installation of the proper VISA driver from your GPIB card supplier. Many vendors supply this software with the hardware; National Instruments (http://www.natinst.com) has the driver for their cards available on the internet at a file transfer site (ftp://ftp.natinst.com — find the folder for suppport and VISA drivers).

3.3.4.1 VISA INSTRUMENT DRIVER FUNCTIONS

Kepco’s ABC VISA instrument driver provides programming support for Kepco’s ABC Power Supply (VISA I/O). It contains functions for opening, configuring, taking measurements from, and closing the instrument. To successfully use this module, the instrument must be connected to the GPIB and the GPIB address supplied to the initialize function must match the GPIB address of the instrument.

Table 3-7 lists the functions that are available.

TABLE 3-7. ABC VISA DRIVER FUNCTIONS

Purpose Function Name Description

INITIALIZE FUNCTION

Initialize KpAbc_init Initializes the instrument and sets it to a default configuration.

APPLICATION FUNCTIONS — This class of functions contains high-level test and measurement routines. These functions call other instrument driver functions to configure, start, and get readings from the instrument.

Set and Measure KpAbc_ApplicSetMeas Used to either set and read back, or just read back the output voltage,

current and operating mode of the power supply

ABC 012703

3-13

TABLE 3-7. ABC VISA DRIVER FUNCTIONS (CONTINUED)

Purpose Function Name Description

Get/Set Memory Value KpAbc_GetSetListValue This function can either get or set the values stored in any one of the 40

CONFIGURATION FUNCTIONS — This class of functions configures the instrument by setting system configuration parameters.

Set Program Start Address

Get Program Start Address

Set Maximum Limit Val ue

Get Minimum or Maximum Value

Set Trigger Voltage and Current

Set Trigger Value KpAbc_SetTrigValue Sets the trigger voltage or trigger current level, depending on the switch

Get Trigger Value KpAbc_GetTrigValue Gets the trigger voltage or the trigger current level, depending on the

Set Overvoltage and Overcurrent

Set Protection Delay KpAbc_setProtDelay Sets the protection delay: the delay between the moment the output

Get Protection Delay KpAbc_getProtDelay Displays the protection delay count for the power supply. A count of 30

ACTION/STATUS FUNCTIONS — This class of functions executes commands and queries. It also provides functions which allow the user to determine the current status of the instrument.

Set Voltage and Current KpAbc_Set_Volt_Curr Sets the output voltage and current at the same time.

Set Value KpAbc_SetValue Sets the output voltage, the output current, the overvoltage level, or the

Get Value KpAbc_GetValue Gets the output voltage, the output current, the overvoltage level, or the

Trigger KpAbc_Trig Triggers the instrument once. The output will go to the trigger voltage

Measure Output Value KpAbc_MeasValue Measures the value of output voltage or current depending on the

Get Source Mode KpAbc_GetSourceMode Gets the operating mode of the power supply.

KpAbc_SetStartAddr Sets the memory start address for the program chain. The program

KpAbc_GetStartAddr Gets the memory start address for the program chain. The program

KpAbc_SetMaxLimValue Sets the temporary voltage limit or current limit of the power supply.

KpAbc_GetMinMaxValue Gets the minimum or the maximum output voltage, output current,

KpAbc_SetTrig_Volt_Curr Sets the trigger voltage and trigger current at the same time

KpAbc_Set_OVvolt_OVcurr Sets both the overvoltage and overcurrent values.

available memory locations. Six parameter values can be stored in any one of the 40 locations: voltage level, current level, overvoltage level, overcurrent level, duration of the setting (if used in a program) and next memory address (if used in a program). Depending on the slide selection position, and the value of get/set switch, one of these values is read or set. The values are checked against the maximum acceptable values for the corresponding power supply.

chain can also be executed in local mode. The start memory address range is from 1 to 40.

The limit reduces the output range of the power supply. For example, the output voltage range of a 0 to 10V power supply can be limited to the range of 0 to 5.25V by setting the voltage limit to 5.25V.

overvoltage level, or overcurrent level of the power supply depending on the min_max switch and slide selection position.

position.

switch position.

voltage and current are changed and the moment the overvoltage and overcurrent protections are enabled.

represent ~ 1 second. The protection delay is the delay between the moment the output voltage and current are changed and the moment the overvoltage and overcurrent protections are enabled.

overcurrent level of the power supply, depending on the slide selection position. The values are checked against the maximum acceptable values for the corresponding power supply.

overcurrent level of the power supply depending on slide selection position.

and current values.

switch position.

3-14

ABC 012703

TABLE 3-7. ABC VISA DRIVER FUNCTIONS (CONTINUED)

Purpose Function Name Description

Output On/Off KpAbc_OutputOnOff Sets the output on or off.

Get Output Status KpAbc_getOutputState Returns the output status (on or off).

Get Protection Status KpAbc_getProtectionStatus Gets the status of overvoltage or overcurrent protection (triggered or

Clear Protection KpAbc_clearProtection Clears the overvoltage or overcurrent protection.

Abort Measurement KpAbc_abortMeas Sends the abort command.

Beep KpAbc_beep The selected ABC power supply will emit a beep.

DATA FUNCTIONS — This class of functions transfers data to or from the instrument.

Set Memory Index KpAbc_SetIndex Sets the index pointer to one of the 40 available memory locations The

Get Memory Index KpAbc_GetIndex Gets the value of the index pointer.

Set Memory Value KpAbc_SetListValue Depending on the slide selection position, this function sets the value of

Get Memory Value KpAbc_GetListValue Depending on the slide selection position, this function gets the value

Save/Recall Settings KpAbc_SaveRecSet Saves the current settings to the selected memory location or restores

UTILITY FUNCTIONS — This class of functions provides lower level functions to communicate with the instrument and to change instrument parameters.

Identify Power Supply KpAbc_identify Returns the full message returned by the power supply to the *IDN?

Revision Query KpAbc_RevisionQuery Returns the revision numbers of the instrument driver and instrument

Model Query KpAbc_ModelQuery Return the model number of the ABC power supply.

Serial Number Query KpAbc_SerialnQuery Returns the serial number of the ABC power supply. The serial number

Query SCPI Version KpAbc_GetScpiVersion Returns the power supply answer to the Query SCPI Version com-

Set/Reset Keypad Lock KpAbc_setResetKeybLock Locks or unlocks keypad operation. Used to prevent changing the set-

Keypad Lock Status KpAbc_keybLockStat Return the status of the local keypad access: 0 if local access enabled;

Display Text KpAbc_display Configures the front panel display of the instrument. In normal mode

Get Display Text KpAbc_getDisplay Gets the string which is displayed on the second line of the display.

Get Display Contrast KpAbc_getContrast Gets the contrast value of the front panel display of the instrument

not triggered).

subsequent memory value changes will affect the memory location pointed to by the index pointer.

the specified parameter (voltage level, current level, overvoltage level, overcurrent level, time value, next memory address value) for the memory location pointed to by the index pointer.

of the specified parameter (voltage level, current level, overvoltage level, overcurrent level, time value, next memory address value) for the memory location pointed to by the index pointer.

previously stored settings from a memory location. The memory location range is from 1 to 40.

query. This message contains four fields: manufacturer, power supply type, serial number and firmware version.

firmware version from the *idn? query. This instrument driver's Revision Number is "Rev 1.0, 9/95, CVI 3.1" and the ABC firmware version is Firmware Version "1.0". This data is necessary when requesting technical support.

is extracted from the answer to the *idn? query.

mand. Checks the Standard Commands for Programmable Instruments (SCPI) language version.

tings of the power supply from the local keypad.

1 if local access is disabled.

the values measured at the output of the power supply are displayed. In text mode a user defined string can be displayed on the second row of the display.

(between 0.1 and 0.9).

ABC 012703

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TABLE 3-7. ABC VISA DRIVER FUNCTIONS (CONTINUED)

Purpose Function Name Description

Set Display Contrast KpAbc_setContrast Configures the contrast of front panel display of the instrument (value

Write To Instrument KpAbc_writeInstrData This function writes commands and queries to the instrument to modify

Read Instrument Data KpAbc_readInstrData This function reads data from the instrument's output buffer and returns

Reset KpAbc_psReset Resets the instrument to a known state and sends initialization com-

Self-Test KpAbc_selfTest Runs the instrument's self test routine and returns the test result(s).

Error-Query KpAbc_errorQuery Reads an error code from the instrument's error queue.

Error Message KpAbc_errorMessage Takes the Status Code returned by the instrument driver functions,

Calibration Status On/Off KpAbc_CalStatus Used to enter or exit the calibration state. To enter the calibration state

Calibration Mode KpAbc_CalMode Allows the user to select the calibration mode (either voltage or current

Calibration DigPot KpAbc_CalDigPot Allows a more accurate full scale calibration in both voltage or current

Calibration Output KpAbc_CalOutput Allows the user to perform the power supply calibration in both voltage

Calibration Zero KpAbc_CalZero Used to zero the output of the power supply before switching from volt-

Calibration Save KpAbc_CalSave Stores the calibration results in the nonvolatile calibration memory of

Security Code KpAbc_CalCode Allows the user to change the password to prevent accidental or unau-

Close KpAbc_close This function takes the instrument off-line.

between 0.1 and 0.9).

parameters and query device settings.

it to the specified variable in memory. Because the instrument may return both numeric and text data in response to queries, this function returns the data in string format. NOTE: If valid data is not available at the instrument's output buffer when this function is called, the instrument will hang up and the function will not return until it times out. If the time-out is disabled,` this function will hang indefinitely and it may be necessary to reboot the computer to break out.

mands to the instrument.

interprets it and returns it as a user readable string.

a 4 digits password is required. When the instrument is shipped from the factory the calibration password is the 4 digit model number. The password protects the instrument against unauthorized calibrations.

calibration) and also allows selection of 0 (min) or full scale (max) calibration.

mode. Moving the digital potentiometer allows the user to approach the nominal full scale value of the corresponding power supply. This is a coarse adjustment for the full scale value which must be followed by a fine adjustment done with the Calibration Output function.

or current mode. By moving the digital to analog converter the number of LSB's specified in the repeat count, the user can approach the 0 or full scale value of the corresponding power supply. This is a fine adjustment for the 0 or full scale value. The user can specify a repeat count between 1 and 9 in order to avoid having to repeat sending the command

age calibration to current calibration (to allow a calibration resistor to be connected between the power supply output terminals.

the instrument.

thorized calibrations of the instrument. The password is stored in nonvolatile memory, and does not change when power has been off or after a reset. To change the password, the instrument must already be in calibration status, ensuring that the user knows the current password. If the password is lost, call the factory for support.

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ABC 012703

3.3.4.2 VISA INSTRUMENT DRIVER PROGRAMMING REFERENCE MANUAL

A programming reference manual is supplied on the VISA driver diskette (file kp_abc.doc). It describes each function in Kepco’s ABC Power Supply (VISA I/O). The functions are listed in alphabetical order with a description of the function, the C syntax of the function, a description of each parameter, and possible error codes. The sample application program included on the diskette can also be referenced and used as a programming guide, since it is debugged and illlustrates successful programming techniques.

Error codes are returned as the return value of each instrument driver function. A program should examine this value after each call to an instrument driver function to determine if any error occurred. Possible error codes and their meanings are listed with the corresponding instrument driver function.

3.3.4.3 DEMONSTRATION PROGRAM USING THE VISA DRIVER

The demonstration program is intended to illustrate the use of the VISA functions included with the ABC power supply. The program can be used as is, or used as a starting point for a custom user-designed program. The source file (kp_appl.c) is included on the VISA driver diskette. The demonstration program is installed under Windows by running SETUP.EXE. The program can be used to program and view the virtual front panels of up to 10

ABC Power Supplies. After the

program is installed, double click on kepcoabc.exe to run the program.

You must enter the GPIB address of the ABC power supply to connect to the VISA interface. Once you are connected, you will see the virtual front panel (Figure 3-2, upper left).

The virtual front panel can show all power supply parameters simultaneously, without the having to execute local controls and read the corresponding display. The virtual panel is a real-time display of output values and programmed parameters. All local functions are also available from the virtual panel. The virtual panel is shown at the upper left of Figure 3-2; additional windows for Protections, Limits, Program Memories (below the panel), Edit Program Memory, Program, Display Change, and Display message (To the right of the panel) are also illustrated.

At the top of the panel, the Mode indicators light to indicate whether the power supply is operating in either CV (constant voltage) or CC (constant current) mode. At the top left and right are analog meters that read actual output voltage and current; a Display window at the center provides a more precise digital readout of actual output voltage and current. Above the display window, between the two analog meters, is the Output button which either applies the programmed settings to the output terminals (ON) or keeps the output voltage and current at zero (OFF). Indicators on either side of the digital display window, V limit and C limit, light (red) if the programmed voltage or current limit is exceeded. The Set Voltage and Set Current windows are adjacent to the limit indicators. Displayed settings can be changed either by clicking on the arrows to the left of the display window, or by using the mouse to highlight the setting, then typing in the new value.

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FIGURE 3-2. ABC VISA APPLICATION, VIRTUAL PANEL

Additional features can be accessed by twelve buttons arranged in two rows of six at the bottom of the panel. The Beep button causes the selected power supply to beep. The Protection button opens the Protection window that shows the overvoltage, overcurrent and protection delay settings, the OV/OC Protection CLEAR button resets the overvoltage and overcurrent protection if it has tripped (voltage and current are reset to the programmed values in effect when protection tripped). The Memory button opens the Program Memories window that allows the active values for output current and voltage, and programmed settings for overvoltage and overcurrent protection to be stored in one of the 40 available memory locations, or be recalled from a previously stored location. The Trigger button opens the Trigger window which allows trigger voltage and current values to be set; the Trigger button within the Trigger window causes the power supply output to be programmed to the settings of trigger voltage and current. The Cali- brate button is used to recalibrate the unit (see Section 4). The Reset button resets the unit to the power on defaults: output voltage and current set to zero, overvoltage and overcurrent set to approximately 10% above rated maximum.

The ABOUT button displays the model, serial number and firmware version number. The Limit button opens the Limits window that reveals the Voltage and Current Limit settings. The Pro-

gram button opens two windows used to control local programming. The Edit Program Memory window is used to view or change any of the six stored parameters for the memory location selected by the Memory window. The V > OV and C > OC indicators light (red) if the Edit Program values for voltage or current exceed the Edit Program values for Overvoltage or Overcur- rent. The Program Window is used to execute the local program established by the Edit Program Window. The Step button executes one memory location at a time, starting at the Start Address; the Step Mode indicator lights after the first step is executed. As each step is

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ABC 012703

executed, the corresponding values for each parameter are displayed in the Edit Program Memory window. The Run button causes the program to be executed starting at the location in the Start Address display window; the Running indicator lights (green) while the program is running. The Clear button stops a program that is running.

The Keypad button either enables (UNLOCK) or disables (LOCK) the local keypad of the selected ABC power supply. The Display button opens the Display Change window which allows adjustment of the local LCD contrast, and selection of Normal/Text mode for the LCD. In Normal mode, the bottom line of the local LCD displays output voltage and current. In Text mode, the text typed in the Display Message window is displayed on the bottom line of the LCD. The QUIT button is used to exit the sample VISA application.

Once the program is started, actual values of output current and voltlage are displayed. If you exit the program while the power supply is still on, the programmed settings in effect at that time are maintained after exiting the program.

3.3.5 PROGRAMMING TECHNIQUES TO OPTIMIZE POWER SUPPLY PERFORMANCE

Proper programming techniques can offer significant response time improvement and reduce undesirable transients at the power supply output. The key to performance optimization is to minimize mode changes (voltage mode/current limit to current mode/voltage limit or vice versa). Mode changes should be limited to changes in load conditions (to which the power supply will respond automatically), or by programming the limit parameter when required by the user application.

The proper way to program the power supply is to initially program the operating parameter to zero and the complementary limit parameter to the desired maximum value. Subsequent commands should change only the operating parameter. (The operating parameter is the parameter that controls the output, e.g., voltage controls the output in voltage mode, current in current mode.) The complementary limit parameter should be programmed only when there is a need to change it.

3.3.5.1 EXAMPLE OF PROPER PROGRAMMING

Assume the power supply is intended to operate in a test application that requires a set of specific output voltages. The initial set of commands should program output voltage and current limit. If the same current limit applies to the rest of the test, all subsequent commands should only program output voltage.

3.3.5.2 EXPLANATION OF PROGRAMMING TECHNIQUES

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. In addition to increasing the time before the output reflects the programmed command, undesirable transients may also be present at the output during this period.

ABC 012703

By sending only the operating command, 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.

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3.4 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 ABC Power Supply as ASCII output strings within the selected programming language (PASCAL, BASIC, etc.) in accordance with the manufacturer’s requirements for the particular GPIB controller card used.

Different programming languages (e.g., BASIC, C, PASCAL, etc.) have different ways of representing data that is to be put on the IEEE 488 bus. It is up to the programmer to determine how to output the character sequence required for the programming language used. Address information (GPIB address) must be included before the command sequence. (See PAR.3.3.3 to establish the ABC Power Supply GPIB address.)

3.4.1 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.

3.4.2 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 4-4). Refer also to syntax considerations (PARs 3.4.3 through 3.4.6).

3.4.3 SCPI SUBSYSTEM COMMAND/QUERY STRUCTURE

Subsystem commands/queries are related to specific power supply functions (such as setting output voltage, current limit, etc.) Figure 3-3 is a tree diagram illustrating the structure of SCPI subsystem commands used in the ABC Power Supply with the “root” at the left side, and specific commands forming the branches. The following paragraphs introduce the subsystems; subsystem commands are defined and explained in Appendix B.

3.4.3.1 ABORT SUBSYSTEM

This subsystem allows pending trigger levels to be cancelled.

3.4.3.2 DISPLAY SUBSYSTEM

This subsystem controls the second line of the LCD. The first line will always display the LOCal or REMote operation status and the constant Voltage (CV) or constant Current functioning mode (CC).

3.4.3.3 INITIATE SUBSYSTEM

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This subsystem enables the trigger system. When a trigger is enabled, the triggering action will occur upon receipt of a GPIB <GET>, *TRG or TRIGger command. If a trigger circuit is not enabled, all trigger commands are ignored.

ABC 012703

3.4.3.4 LIST SUBSYSTEM

The LIST subsystem is represented by the 40 memory locations (groups of settings) which are stored in the nonvolatile memory. Each setting contains values for: Current, Voltage, Overcurrent, Overvoltage, Next memory location, and Time. The range for the first four values is the maximum available range for the specific power supply. The Next memory location is the address of the next group of settings and is between 1 and 40. A value of 0 means end of chain. The Time setting is between 0.01 and 300 seconds. In order to access one of the 40 memory locations an index value must be provided. The 40 memory locations can be very useful in remote mode using the *RCL command (see Appendix A, PAR. A.10.)

3.4.3.5 MEASURE SUBSYSTEM

This query subsystem returns the voltage and current measured at the power supply's output terminals.

3.4.3.6 OUTPUT SUBSYSTEM

This subsystem controls the power supply's voltage and current outputs

3.4.3.7 PROTECTION SUBSYSTEM

This subsystem allows overvoltage/overcurrent protection tripping to be delayed to prevent brief transients (caused by application of power to a reactive load) from tripping overvoltage/overcurrent protection.

3.4.3.8 STATUS SUBSYSTEM

This subsystem programs the power supply status register. The power supply has two groups of status registers: Operation and Questionable. Each group consists of three registers: Condition, Enable, and Event.

3.4.3.9 TRIGGER SUBSYSTEM

This subsystem controls the remote triggering of the power supply.

3.4.3.10 [SOURCE:]VOLTAGE AND [SOURCE:]CURRENT SUBSYSTEMS

These subsystems program the output voltage and current of the power supply.

3.4.3.11 CALIBRATE SUBSYSTEM

The ABC series of power supplies support software calibration. A full calibration consist of a voltage calibration and a current calibration. Both voltage and current calibrations consist of a zero and a full scale calibration. There are two ways to perform the calibration: locally using the front panel keys, or remotely sending commands through the GPIB bus. These two ways cannot be combined.

In order to enter the calibration mode the correct calibration access code (password) must be entered. If the password has been forgotten call the factory and a secret password (which has been assigned to your power supply) will be provided. During the calibration, new calibration data is computed which is than stored in the non volatile memory.

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3-21

The following equipment is required for calibration: Digital Voltmeter (DVM) with 6 digits Dc accuracy. Shunt 0.1 Ohm, 0.04%, minimum 15A, power > 50W (100W recommended)

Because the voltage measured will be used as reference for calibration, the DVM itself must be calibrated accurately. During voltage calibration, the voltage, overvoltage and voltage readback are calibrated and during current calibration the current, overcurrent and current readback are calibrated. The normal procedure is to calibrate voltage first and then current. However, you do not have to do a complete calibration each time. If required, you may calibrate only the voltage or the current and then proceed to saving the calibration results. For voltage calibration all loads must be disconnected and the sense terminals connected to the corresponding output terminals. The digital voltmeter will be connected to the output of the power supply. For current calibration after disconnecting all loads an appropriate shunt resistor will be connected across output terminals and the digital voltmeter will be connected across the sense terminals of the shunt resistor.

3.4.4 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 (“newline” character). Sending a character with EOL line asserted is another way of sending a message terminator. The message unit is a keyword consisting of a single command or query word followed by a message terminator (e.g., CURR?<newline> or TRIG<end-of-line>). The message unit may include a data parameter after the keyword 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 3-4 illustrates the message structure, showing how message units are combined. The following subparagraphs explain each component of the message structure.

NOTE: An alternative to using the message structure for multiple messages defined in the fol-

lowing paragraphs is to send each command as a separate line. In this case each command must use the full syntax shown in Appendix B.

3.4.4.1 KEYWORD

Keywords are instructions recognized by a decoder within the ABC, referred to as a “parser.” Each keyword describes a command function; all keywords used by the ABC are listed in Figure 3-3.

Each keyword has a long form and a short form. For the long form the word is spelled out completely (e.g. STATUS, OUTPUT, VOLTAGE, and TRIGGER are long form keywords). For the short form only the first three or four letters of the long form are used (e.g., STAT, VOLT, OUTP, and TRIG). The rules governing short form keywords are presented in Table 3-8.

IF NUMBER OF LETTERS IN

LONGFORM KEYWORD IS:

4 OR FEWER (DOES NOT MATTER) ALL LONG FORM LETTERS MODE

5 OR MORE

TABLE 3-8. RULES GOVERNING SHORTFORM KEYWORDS

AND FOURTH LETTER

IS A VOWEL?

YES

THEN SHORT FORM

CONSISTS OF:

THE FIRST FOUR

LONG FORM LETTERS

THE FIRST THREE

LONG FORM LETTERS

MEASure, OUTPut, EVENt

LEVel, IMMediate, ERRor

EXAMPLES

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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.

ABC 012703

ROOT :

(colon)

ABORt subsystem

ABORt

INITiate subsystem

INITiate

[:IMMediate]

:CONTinuous bool :CONTinuous?

CALibrate subsystem

CALibrate

:STATus <boolean> ,password :STATus? :VOLTage

:LEVel (MIN | MAX, ZERO) [:DATA] val GAIN (UP | DOWN)

:CURRent

:LEVel (MIN | MAX, ZERO) [:DATA] val

GAIN (UP | DOWN) :ZERO :SAVE

DISPlay subsystem

DISPlay

:CONTrast 0 to 1 :CONTrast?

[:WINDow]:TEXT[:DATA] “....”

[:WINDow]:TEXT[:DATA]? [:WINDow]:STATe (0 | 1) [:WINDow]:STATe?

PROGram subsystem

:PROGram (RUN | STOP)

:STATe :STATe?

[SOURce:] subsystem

[SOURce:] VOLTage

[:LEVel]

[:IMMediate]

[:AMPLitude] val [:AMPLitude]? MIN, MAX

:TRIGgered

[:AMPLitude] val [:AMPLitude]? MIN, MAX

:PROTection

:TRIPped? :CLEar

:LIMit

:HIGH val :HIGH? MIN, MAX

CURRent

[:LEVel]

[:IMMediate]

[:AMPLitude] val [:AMPLitude]? MIN, MAX

:TRIGgered

[:AMPLitude] val [:AMPLitude]? MIN, MAX

:PROTection

:TRIPped? :CLEar

:LIMit

:HIGH val :HIGH? MIN, MAX

FUNCtion

:MODE VOLTage CURRent :MODE?

LIST subsystem

LIST

:CURRent

[:LEVel] val [:LEVel]? :PROTection val :PROTection?

:VOLTage

[:LEVel] val [:LEVel]? :PROTection val

:PROTection? :INDex val :INDex? :SEQuence

:STARt val

:STARt ?

:NEXT val

:NEXT? :DWELl val :DWELl?

STATus subsystem

STATus

:OPERation

:CONDition? :ENABle val :ENABle?

[:EVENt]? :PRESet :QUEStionable

:CONDition?

:ENABle val

:ENABle?

[:EVENt]?

:VOLTage

:CONDition? :ENABle val :ENABle? :[:EVENt]?

:CURRent

:CONDition? :ENABle val :ENABle? :[:EVENt]?

SYSTem subsystem

SYSTem

:ERRor

[:NEXT]?

:CODE?

[:NEXT]? :ALL?

:PASSword

[:CENAble] (code)

:STATe? :CDISenable (code) :NEW (OLD | NEW)

:SECUrity

:IMMediate

:LANGuage(SCPI | COMPatibility) :BEEP :VERSion? :KLOCk <boolean> :KLOCk?

INSTRument subsystem

INSTrument

:CATalog? :NSELect val :NSELect? [:SELect] val [:SELect]? :STATe? :STATe (ON | OFF)

ABC 012703

MEASure subsystem

MEASure

[:SCALar]:CURRent[:DC]? [:SCALar]:[VOLTage][:DC]?

OUTPut subsystem

OUTPut

[:STATe] ON or OFF [:STATe]?

FIGURE 3-3. TREE DIAGRAM OF SCPI COMMANDS USED WITH ABC POWER SUPPLY

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KEYWORD

ROOT SPECIFIER

MESSAGE UNIT SEPARATOR

DATA SEPARATOR

DATA

DATA SEPARATOR

KEYWORD

KEYWORD SEPARATOR

KEYWORD

To identify the short form and long form in this manual, keywords are written in upper case letters to represent the short form, followed by lower case letters indicating the long form (e.g., IMMediate, EVENt, and OUTPut). The parser, however, is not sensitive to case (e.g., outp, OutP, OUTPUt, ouTPut, or OUTp are all valid).

MESSAGE UNIT SEPARATOR

ROOT SPECIFIER

KEYWORD

QUERY INDICATOR

MESSAGE TERMINATOR

CURR:LEV 3.5;:OUTP ON;:CURR?<NL>

MESSAGE UNIT

FIGURE 3-4. MESSAGE STRUCTURE

3.4.4.2 KEYWORD SEPARATOR

If a command has two or more keywords, adjacent keywords must be separated by a colon (:) which acts as the keyword separator (e.g., CURR:LEV:TRIG). The colon can also act as a root specifier (paragraph 3.4.4.7).

3.4.4.3 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?).

3.4.4.4 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

3.4.4.5 DATA SEPARATOR

Data must be separated from the last keyword by a space (e.g., VOLT:LEV:TRIG 14 or SOUR:VOLT? MAX

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ABC 012703

3.4.4.6 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).

3.4.4.7 ROOT SPECIFIER

The root specifier is a colon (:) that precedes the first keyword of a program message. This places the parser at the root (top left, Figure 3-3) of the command tree. Note the difference between using the colon as a keyword separator and a root specifier in the following examples:

VOLT:LEV:IMM 16 Both colons are keyword separators.

:CURR:LEV:IMM 4 The first colon is the root specifier, the other two are keyword separators.

VOLT:LEV 6;:CURR:LEV 15 The second colon is the root specifier, the first and third are keyword separators

:INIT ON;:TRIG;:MEAS:CURR?;VOLT? The first three colons are root specifiers.

3.4.4.8 MESSAGE TERMINATOR

The message terminator defines the end of a message. One message terminator is permitted:

• new line (<NL>), ASCII 10 (decimal) or 0A (hex)

NOTE: Kepco power supplies require a message terminator at the end of each program mes-

sage. The examples shown in this manual assume a message terminator will be added at the end of each message. Where a message terminator is shown it is represented as <NL> regardless of the actual terminator character.

3.4.5 UNDERSTANDING THE COMMAND STRUCTURE

Understanding the command structure requires an understanding of the subsystem command tree illustrated in Figure 3-3. The “root” is located at the top left corner of the diagram. The parser goes to the root if:

• a message terminator is recognized by the parser

• a root specifier is recognized by the parser

Optional keywords are enclosed in brackets [ ] for identification; optional keywords can be omitted and the power supply will respond as if they were included in the message. The root level keyword [SOURce] is an optional keyword. Starting at the root, there are various branches or paths corresponding to the subsystems. The root keywords for the ABC Power Supply are :ABORt, :CALibrate, :DISPlay, :INITiate, :LIST, :MEASure, :OUTPut, [:SOURce], :STATus, :SYSTem and :TRIGger. Because the [SOURce] keyword is optional, the parser moves the path to the next level, so that VOLTage, CURRent, and FUNCtion commands are at the root level.

Each time the parser encounters a keyword separator, the parser moves to the next indented level of the tree diagram. As an example, the STATus branch is a root level branch that has three sub-branches: OPERation, PRESet, and QUEStionable. The following illustrates how SCPI code is interpreted by the parser:

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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.

3.4.6 PROGRAM MESSAGE SYNTAX SUMMARY

• Common commands begin with an asterisk (*).

• Queries end with a question mark (?).

• Program messages consist of a root keyword and, in some cases, one or more message units separated by a colon (:) followed by a message terminator. Several message units of a program message may be separated by a semicolon (;) without repeating the root keyword.

• If a program message has more than one message unit, then a colon (:) must precede the next keyword in order to set the parser back to the root (otherwise the next keyword will be taken as a subunit of the previous message unit).

e.g., the command meas:volt?;curr? will read output voltage and output current since both volt? and curr? are interpreted as subunits of the meas command.

• Several commands may be sent as one message; a line feed terminates the message. Commands sent together are separated by a semicolon (;). The first command in a message starts at the root, therefor a colon (:) at the beginning is not mandatory.

e.g., the command meas:volt?;:curr? will read output voltage and programmed current since the colon preceding curr? indicates that curr? is not part of the meas command and starts at the root.

• UPPER case letters in mnemonics are mandatory (short form). Lower case letters may either be omitted, or must be specified completely (long form) e.g., INSTrument (long form) has the same effect as INST (short form).

• Commands/queries may be given in upper/lower case (long form) e.g., SoUrCe is allowed.

• Text shown between brackets [ ] is optional. e.g., :[SOUR]VOLT:[LEV] TRIG has the same effect as :VOLT TRIG

3.4.7 SCPI PROGRAM EXAMPLES

Refer to Appendix B, Figures B-1 through B-7 for examples illustrating the use of SCPI commands.

3-26

Figure 3-5 is an example of a program using SCPI commands to program the ABC Power Supply. The program illustrated is for a configuration using an IBM PC or compatible with a National

ABC 012703

Instruments GPIB interface card. (It will be necessary to consult the manufacturer’s data to achieve comparable functions with an interface card from a different manufacturer.) This program sets output voltage (Voltage mode) or voltage limit (Current mode) to 5V, and current limit (Voltage mode) or output current (Current mode) to 1A, then reads the measured (actual) voltage and current, then prints the measurements.

3.5 OPERATOR MAINTENANCE

1. Twice a year, clean exterior surfaces using a dry lint-free cloth to wipe all exterior surfaces of the power supply to remove dust and other contaminants.

2. Once a year, clean the front panel as follows:

• Disconnect the unit from mains power

• Using a damp, lint-free cloth, wipe the front panel to remove any accumulated dirt.

• Reconnect a-c power to the unit.

/**************************************************************************/ /* Sample Program For KEPCO power supply, using National Instruments */ /* GPIB interface card and IBM PC or compatible computer */ /**************************************************************************/

#include <stdio.h> #include "decl.h"

char rd_str[80]; // Input buffer char dat_str[80]; // Output buffer int bd,adr;

main() {

adr = ibfind("DEV6"); // Open DEV6 (defined by IBCONF) bd = ibfind ("GPIB0"); // Open GPIB card ibsic (bd); // Send Interface Clear ibsre(bd,1); // Set remote line true

strcpy(dat_str,"VOLT 5;CURR 1"); // Define a set command strcat(dat_str,"\r\n"); // Append delimiter ibwrt(adr,dat_str,strlen(dat_str)); // Send string to power supply

strcpy(dat_str,"MEAS:VOLT?;CURR?"); // Define a measure command strcat(dat_str,"\r\n"); // Append delimiter ibwrt(adr,dat_str,strlen(dat_str)); // Send string to power supply

strset(rd_str,'\0'); // Clear input buffer ibrd(adr,rd_str,64); // Read result of measure printf("received : %s\n",rd_str); // Print voltage and current

FIGURE 3-5. TYPICAL EXAMPLE OF ABC POWER SUPPLY PROGRAM USING SCPI COMMANDS

ABC 012703

3-27/(3-28 Blank)

4.1 GENERAL

This section contains the calibration instructions for the Power Supply. It is recommended that the user be familiar with Local Mode operation (PAR.3.2) before calibrating the unit.

A full calibration consist of a voltage calibration and a current calibration. Both voltage and current calibrations consist of a zero and a full scale calibration. There are two ways to perform the calibration: locally using the front panel keys or remotely sending commands through the GPIB bus. These two ways cannot be combined.

In order to enter the calibration mode the correct calibration access code (password) must be entered. If the password has been forgotten, call the factory and a special password (which has been assigned to your power supply) will be provided. During the calibration, new calibration data is computed which is then stored in the nonvolatile memory.

4.2 EQUIPMENT REQUIRED

The following equipment is required to calibrate the ABC Power Supply.

• Digital Voltmeter (DVM) with 6 digits d-c accuracy.

• Shunt Resistor: During the calibration procedure the LCD displays the minimum requirements for the shunt resistor. However, to avoid problems due to drift caused by heat dissipation at higher power levels, Kepco recommends the following:

SECTION 4 - CALIBRATION

– ABC 10-10DM: 0.1 Ohm, 0.04%, 15A, 50W minimum (100W recommended)

– ABC 15-7DM: 0.1 Ohm, 0.04%, 15A, 50W minimum (100W recommended)

– ABC 25-4DM: 0.25 Ohm, 0.04%, 15A, 50W minimum (100W recommended)

– ABC 36-3DM: 0.25 Ohm, 0.04%, 15A, 50W minimum (100W recommended)

– ABC 60-2DM: 1.0 Ohm, 0.04%, 15A, 50W minimum (100W recommended)

– ABC 125-1DM: 1.0 Ohm, 0.04%, 15A, 50W minimum (100W recommended)

NOTE: Because the voltage measured will be used as reference for calibration, the DVM used

must be accurately calibrated prior to calibrating the ABC power supply.

4.3 CALIBRATION PROCEDURES

During voltage calibration, the voltage, overvoltage and voltage readback are calibrated and during current calibration the current, overcurrent and current readback are calibrated. The normal procedure is to calibrate voltage first and then current. However, you do not have to do a complete calibration each time. If required, you may calibrate only the voltage or the current and then proceed to saving the calibration results. For either voltage or current calibration, BOTH zero AND full scale calibrations must be performed.

For voltage calibration all loads must be disconnected and the sense terminals connected to the corresponding output terminals. The digital voltmeter will be connected to the output of the power supply. For current calibration after disconnecting all loads an appropriate shunt resistor will be connected across output terminals and the digital voltmeter will be connected across the sense terminals of the shunt resistor.

ABC 012703

4-1

NOTES: Keys with dual functions are labeled with both a command and a number. The com-

mand label is referred to when the unit is in command entry status; the number is referred to when the unit is in data entry status.

1. With the power supply in command entry status , press CALIB key. power supply enters Calibration mode, data entry status .

2. Enter password (4 digits) and press ENTER. If password is incorrect, **WRONG PASS- WORD** flashes, then LCD returns to command status. (See PAR. 4.4 to change the password).

3. If password is correct, LCD reads VOLTAGE CALIB. Enter 1 for voltage calibration (see PAR. 4.3.1), enter 0 to proceed to current calibration.

4. LCD reads CURRENT CALIB. Enter 1 for current calibration (see PAR. 4.3.2), enter 0 to exit Calibration mode.

4.3.1 VOLTAGE CALIBRATION

1. With LCD reading VOLTAGE CALIB. Connect Instr., connect DVM to output (+) and (– ) terminals of power supply. then press ENTER.

2. With LCD reading Vout ZERO adj., monitor DVM and use decrease output voltage as necessary to get DVM reading as close to zero as possible (without going to negative value). Press ENTER when complete.

NOTE: During calibration the

ments. If necessary, use the 1 (decrease) and 3 (increase) keys for coarse adjustment, then use the

3. LCD will flash Vout F.S.adj. **WAIT** then Vout F.S. adj < >. Monitor DVM and use

or Í keys to increase or decrease output voltage as necessary to get DVM reading as close as possible to full scale value (without exceeding full scale value). E.g., for ABC 254DM, adjust for DVM reading as close to 25.000V as possible. Press ENTER when complete.

4.3.2 CURRENT CALIBRATION

1. LCD reads CONNECT SHUNT <n OHM >zz A (n and zz values are determined by ABC model being calibrated.; e.g., for ABC 10-10DM LCD reads <1 OHM, >50 W). Refer to PAR.

4.2 for shunt requirements. Press ENTER.

2. LCD reads CONNECT DVM TO SHUNT. Connect Precision Shunt across output (+) and (–) terminals of power supply and connect DVM to sense terminals of shunt. Press ENTER when connections are complete.

NOTE: During calibration the

ments. If necessary, use the 1 (decrease) and 3 (increase) keys for coarse adjustment, then use the

(increase) or Í (decrease) keys are used for fine adjust-

or Í keys.

(increase) or Í (decrease) keys are used for fine adjust-

or Í keys.

or Í keys to increase or

4-2

3. With LCD reading Iout ZERO adj., monitor DVM and use decrease output current as necessary to get DVM reading as close to zero as possible (without going to negative value). Press ENTER when complete.

or Í keys to increase or

ABC 012703

4. LCD will flash Iout F.S.adj. **WAIT** then Iout F.S. adj < >. Monitor DVM and use or keys to increase or decrease output voltage as necessary to get DVM reading as close as possible to value listed below (without exceeding value listed).

– ABC 10-10DM: 1.000V

– ABC 15-7DM: 0.700V

– ABC 25-4DM: 1.000V

– ABC 36-3DM: 0.750V

– ABC 60-2DM: 2.000V

– ABC 125-1DM: 1.000V

5. Press ENTER when complete.

4.4 CHANGING THE CALIBRATION PASSWORD

The 4-digit password is required for to enter calibration mode. The factory default passwords are listed in Table 4-1.

TABLE 4-1. FACTORY DEFAULT CALIBRATION PASSWORDS

MODEL PASSWORD

ABC 10-10DM 1010

ABC 15-7DM 1507

ABC 25-4DM 2504

ABC 36-3DM 3603

ABC 60-2DM 6002

ABC 125-1DM 1251

1. If the unit is not in command entry status , press CLEAR or RESET to put the unit in command entry status.

2. Press MENU key si times. LCD reads Change Passw. OldPass .

3. Enter the old password and press ENTER. Then enter the new 4-digit Password and press ENTER.

4. The new password is accepted and the LCD shows the next Menu screen GoTo Previous CALIB? 1 Yes.

5. Press CLEAR to exit the Menu, press 1 to restore the previous calibration values (see PAR.

4.5), or MENU for additional menu screens.

ABC 012703

4-3

4.5 RESTORING PREVIOUS CALIBRATION VALUES

Each time the unit is calibrated, the previous calibration values are retained in non-volatile memory. If it is determined that a new calibration is erroneous, the previous calibration values can be restored.

1. If the unit is not in command entry status , press CLEAR or RESET to put the unit in command entry status.

2. Press MENU key seven times. LCD reads GoTo Previous CALIB? 1 .

3. Press 1, then ENTER. LCD reads Calibration ! PassWord .

4. Enter 4-digit password and press ENTER. Previous calibration values are restored.

4.6 RESTORING FACTORY CALIBRATION VALUES

The original factory calibration values can be restored.

1. If the unit is not in command entry status , press CLEAR or RESET to put the unit in command entry status.

2. Press MENU key eight times. LCD reads GoTo Factory CALIB? 1 .

3. Press 1, then ENTER. LCD reads Calibration ! PassWord .

4. Enter 4-digit password and press ENTER. Factory calibration values are restored.

4.7 SETTING FACTORY CALIBRATION VALUES

After a unit has been repaired, is operating correctly, and has been calibrated, the new calibration values should be saved as the new factory calibration values. This can only be accomplished via the GPIB interface.

To save the current calibration values to the non-volatile RAM as factory default values, send the following strings via the GPIB interface:

SYSTEM:PASS:CENABLE xxxx DIAG:NEW_FACTORY_CAL

where xxxx = the current password of the power supply.

4-4

ABC 012703

APPENDIX A - IEEE 488.2 COMMAND/QUERY DEFINITIONS

A.1 INTRODUCTION

This appendix defines the IEEE 488.2 commands and queries used with the ABC Power Supply These commands and queries are preceded by an asterisk (*) and are defined and explained in Figures A-1 through A-14, arranged in alphabetical order. Table A-1 provides a quick reference of all IEEE 488.2 commands and queries supported in the ABC Power Supply.

COMMAND PAR. COMMAND PAR.

*CLS A.2 *RST A.11

*ESE, ? A.3, A.4 *SAV A.12

*ESR? A.5 *SRE, ? A.13, A.14

*IDN? A.6 *STB? A.15

*OPC, ? A.7, A.8 *TRG A.16

*OPT A.9 *TST? A.17

*RCL A.10

TABLE A-1. IEEE 488.2 COMMAND/QUERY INDEX

A.2 *CLS — CLEAR STATUS COMMAND

*CLS

Syntax: *CLS

Description: Clears status data. Clears the error queue of the instrument. It also clears the following registers

without affecting the corresponding Enable Registers: Standard Event Status Register (ESR), Operation Status Event Register, Questionable Status Event Register, and Status Byte Register (STB). Related commands: *OPC *OPC?. (See example, Figure A-1.)

A.3 *ESE — STANDARD EVENT STATUS ENABLE COMMAND

*ESE

Syntax: *ESE <integer> where <integer> = positive whole number: 0 to 255 per Table A-2.

Default Value: 0

Description: This command programs the standard Event Status Enable register bits. The contents function

as a mask to determine which events of the Event Status Register (ESR) are allowed to set the ESB (Event Summary Bit) of the Status Byte Register. Enables the Standard events to be summarized in the Status Byte register (1 = set = enable function, 0 = reset = disable function). All of the enabled events of the standard Event Status Enable register are logically ORed to cause ESB (bit 5) of the Sta-

tus Byte Register to be set (1 = set = enable, 0 = reset = disable)

(See example, Figure A-1.)

TABLE A-2. STANDARD EVENT STATUS ENABLE REGISTER AND

STANDARD EVENT STATUS REGISTER BITS

CONDITION PON NU CME EXE DDE QUE NU OPC

BIT 76543210

VALUE 128 64 32 16 8 4 2 1

PON Power On NU (Not Used) CME Command Error EXE Execution Error DDE Device Dependent Error QUE Query Error OPC Operation Complete

ABC 012703

A-1

A.4 *ESE? — STANDARD EVENT STATUS ENABLE QUERY

Syntax: *ESE? Return value: Integer> value per Table A-2.

Description: Returns the mask stored in the Standard Event Status Enable Register. Contents of Standard

Event Status Enable register (*ESE) determine which bits of Standard Event Status register (*ESR) are enabled, allowing them to be summarized in the Status Byte register (*STB). All of the enabled events of the Standard Event Status Enable Register are logically ORed to cause ESB (bit 5) of the Status Byte Register to be set (1 = set = enable function, 0 = reset = disable function). (See example, Figure A-1.)

*ESE?

A.5 *ESR? — EVENT STATUS REGISTER QUERY

Syntax: *ESR?

Return value: <integer> (Value = contents of Event Status register as defined in Table A-2.)

Description: Causes the power supply to return the contents of the Standard Event Status register. After it

has been read, the register is cleared. The Standard Event Status register bit configuration is defined in Table A-2 (1 = set, 0 = reset). The error bits listed in Table A-2 are also related to error codes produced during parsing of messages and to errors in the power supply (see PAR. B.79) (See example, Figure A-1.)

• Any 1xx type error sets the Command error bit (5).

• Any 2xx type error sets the Execution error bit (4).

• Any 3xx type error sets the Device error bit (3).

• Any 4xx type error sets the Query error bit (2).

A.6 *IDN? — IDENTIFICATION QUERY

Syntax: *IDN?

Return value: Character string

Description: Identifies the instrument. This query requests identification. The power supply returns a string

which contains the manufacturer name, the model, the serial number and the firmware level. The character string contains the following fields: <Manufacturer>, <Model>, <Serial Number>, <Firmware revision> where: <Manufacturer> = KEPCO, <Model> = ABC-VVAA (V V is Vmax, AA is Imax, e.g.

1010), <Serial Number> = MM,DD,YY-SSS (MM - month, DD - day, YY - year, SSS - serial number in that day) <Firmware revision>=n.m (n.m revision, e.g, 1.0) (See example, Figure A-1.)

*ESR?

*IDN?

A.7 *OPC — OPERATION COMPLETE COMMAND

Syntax: *OPC

Description: Causes power supply to set status bit 0 (Operation Complete) when pending operations are

complete This command sets Standard Event Status Register bit 0 (see Table A-2) to “1” when all previous commands have been executed and changes in output level have been completed. This command does not prevent processing of subsequent commands, but bit 0 will not be set until all pending operations are completed. (1 = set = enable function, 0 = reset = disable function). (See example, Figure A-1.) As an example, the controller sends command(s), then sends *OPC. If controller then sends *ESR?, the power supply responds with either a “0” (if the power supply is busy executing the programmed commands), or a “1” (if the previously programmed commands are complete). (See example, Figure A-1.)

A-2

*OPC

ABC 012703

A.8 *OPC? — OPERATION COMPLETE QUERY

Syntax: *OPC?

Return value: <1> (ASCII) placed in output queue when power supply has completed operation.

Description: Indicates when pending operations have been completed.When all pending operations are com-

plete (all previous commands have been executed and changes in output level have been completed) a “1” is placed in the Output Queue. Subsequent commands are inhibited until the pending operations are completed. *OPC? is intended to be used at the end of a command line so that the application program can monitor the bus for data until it receives the “1” from the power supply Output Queue. (See example, Figure A-1.)

*OPC?

A.9 *OPT? — OPTIONS QUERY

Syntax: *OPT?

Returns string determined by power supply model.

Description: Causes the power supply to return an ASCII string which defines the functionality of the power supply.

The functionality is defined as follows:

STRING DATA MEANING

CAL Support for CALibrate is present.

RL3

M40 Indicates the number of memory steps supported.

D16 Indicates the number of characters supported for user messages on LCD.

Hardware switch controlling remote/local is functional. Unit can be used to take measurements in local mode, but all other functions requeire the unit to be in remote mode (REN must be asserted).

A.10 *RCL — RECALL COMMAND

Syntax: *RCL <integer> (1 to 40)

Description: Restores power supply to previously defined levels of output voltage, output current, overvolt-

age protection, and overcurrent protection.This command selects one of the 40 power supply memory locations, each of which stores values for output current, output voltage, overvoltage protection, and overcurrent protection. The following parameters are affected by *RCL: CURR[:LEV][:IMM] VOLT[:LEV][:IMM] CURR:PROT[:LEV] VOLT:PROT[:LEV]. The recall function also sets the unit to operating parameters to SCPI compatible mode, or device clear operation and output on or off. If the recall value was not initialized by the *SAV command, but from an edit save or front panel save, the output condition will remain unchanged along with the language preferences. (See example, Figure A-1.)

*OPT?

*RCL

ABC 012703

A-3

*CLS Power supply clears status data. *ESE 60 Power supply enables bits 5, 4, 3 and 2, allowing command error, execution

error, device dependent error and query error to set the Event Status

Summary bit when an STB command is executed. *ESE? Returns 60, (value of the mask) verifying that bits 5, 4, 3 and 2 are enabled. *ES Unknown command will set command error (Bit 5). *ESR? Returns 32 (bit 5 set), indicating Command Error has occurred since the last

time the register was read. *IDN? Power supply returns: KEPCO, ABC-1010, 082495-001, 1.0. LIST:IND 21 Selects memory location 21. LIST:CURR 2.35E-1 Sets output current value of memory location 21 to 0.235A. LIST:VOLT 14 Sets output voltage value of memory location 21 to 14V. *OPC Allows status bit 0 to be set when pending operations complete VOLT 21;CURR 3 Sets output voltage to 21V, output current to 3A *SAV 33 The present state of the power supply is stored in memory location 33. *ESR? Returns 129 (128 + 1, power on, bit 7 = 1, operation complete, bit 1 = 1) *ESR? Returns 0 (event status register cleared by prior *ESR?) VOLT 15;CURR 5;*OPC? Sets output voltage to 15V, output current to 5A, puts “1” on output bus when

command operations are complete. *RCL 21 Values in memory location 21 recalled (21V, 3A). *RST Power supply reset to power on default state. *SRE 40 When ESB or QUES bits are set (Table A-3), the Request for Service bit will

be set. *SRE? Returns the value of the mask (40). *STB? For example, the Power supply responds with 96 (64 + 32) if MSS and the

Event Status Byte (Table A-3) summary bit have been set. The power supply

returns 00 if no bits have been set. VOLT 25 Power supply voltage commanded to 25V. VOLT:TRIG 12 Programs power supply voltage to 12V when *TRG received. INIT Trigger event is initialized. *TRG Power supply reverts to commanded output voltage of 12V. *TST? Power supply executes self test and responds with 0 if test completed

successfully, with 1 if test failed.

FIGURE A-1. GPIB COMMANDS

A.11 *RST — RESET COMMAND

Syntax: *RST

Description: Resets power supply to the power on default state. The power supply is programmed to the power

on values of the following parameters: CURR[:LEV][:IMM] = 0, VOLT[:LEV][:IMM] = 0, CURR:PROT[:LEV] = max overcurrent value (see Table 1-2, VOLT:PROT[:LEV] = (maximum overvoltage value (see Table 1-2), OUTP[:STAT] = OFF. If the power supply is in either an overvoltage or overcurrent state, this condition is reset by *RST. (See example, Figure A-1.)

A-4

*RST

ABC 012703

A.12 * SAV — SAVE COMMAND

Syntax: *SAV <integer> (1 to 40)

Description: Saves the present state of output voltage, output current, overvoltage and overcurrent to the

specified memory location. This command stores the present state of the power supply to one of 40 memory locations. The following parameters are stored by *SAV: CURR[:LEV][:IMM], VOLT[:LEV][:IMM], CURR:PROT[:LEV], and VOLT:PROT[:LEV]. The *SAV command also saves the language status and output on/off state. The stored values can be restored by the *RCL command. (See example, Figure A-1.)

*SAV

A.13 *SRE — SERVICE REQUEST ENABLE COMMAND

Syntax: *SRE<integer> where <integer> = value from 0 - 255 per Table A-3, except bit 6 cannot be pro-

grammed.

Description: Sets the condition of the Service Request Enable register. The Service Request Enable register

determines which events of the Status Byte Register are summed into the MSS (Master Status Summary) and RQS (Request for Service) bits. RQS is the service request bit that is cleared by a serial poll, while MSS is not cleared when read. A "1" (1 = set = enable, 0 = reset = disable) in any Service Request Enable register bit position enables the corresponding Status Byte bit to set the RQS and MSS bits. All the enabled Service Request Enable register bits then are logically ORed to cause Bit 6 of the Status Byte Register (MSS/RQS) to be set. Related Commands: *SRE?, *STB?. (See example, Figure A-1.)

*SRE

TABLE A-3. SERVICE REQUEST ENABLE AND STATUS BYTE REGISTER BITS

OPER Operation Status Summary

CONDITION OPER

BIT 76543210

VALUE 128 64 32 16 8 4 2 1

MSS RQS

ESB MAV QUES

ERR

QUE

NU NU

A.14 *SRE? — SERVICE REQUEST ENABLE QUERY

Syntax: *SRE? Response: <integer> = value from 0 - 255 per Table A-3.

Description: Reads the Service Enable Register. Used to determine which events of the Status Byte Register are

programmed to cause the power supply to generate a service request (1 = set = function enabled, 0 = reset = function disabled). Related Commands: *SRE, *STB? (See example, Figure A-1.)

MSS Master Status Summary RQS Request for Service ESB Event Status Byte summary MAV Message available QUES QUEStionable Status Summary ERR QUE 1 or more errors occurred (see

NU (Not Used)

PAR. B.78)

*SRE?

A.15 *STB? — STATUS BYTE REGISTER QUERY

Syntax: *STB? Response: <integer> value from 0 to 255 per Table A-3.

Description: Reads Status Byte Register without clearing it. This Query reads the Status Byte Register (bit 6 =

MSS) without clearing it (1 = set = function enabled, 0 = reset = function disabled). The register is cleared only when subsequent action clears all set bits. MSS is set when the power supply has one ore more reasons for requesting service. (A serial poll also reads the Status Byte Register, except that bit 6 = RQS, not MSS; ands RQS will be reset.) Related Commands: *SRE, *SRE?. (See example, Figure A-1.)

ABC 012703

*STB?

A-5

A.16 *TRG — TRIGGER COMMAND

Syntax: *TRG

Description: Triggers the power supply to be commanded to preprogrammed values of output current and

voltage. When the trigger is armed (checked by examining WTG bit in Status Operational Condition register) *TRG generates a trigger signal. The trigger will change the output of the power supply to the output voltage and current levels specified by VOLT:TRIG and CURR:TRIG commands and clear the WTG bit in the Status Operation

subsystem is immediately rearmed for subsequent triggers, and the WTG bit is again set to

1. *TRG or GET are both addressed commands (only devices selected as listeners will execute the command).

example, Figure A-1.)

Related Commands:

Condition register. If INIT:CONT has been issued, the trigger

ABOR, INIT, TRIG, CURR:TRIG, VOLT:TRIG.

*TRG

(See

A.17 *TST? — SELF TEST QUERY

Syntax: *TST? Returned value: 0 or 1 (0 = pass test, 1 = fail test)

Description: Power Supply test.This query causes the power supply to do a self test and provide the controller

with pass/fail results. A cyclic redundancy check (CRC) is performed on non-volatile RAM. A “1” is returned if there is an error.

*TST?

A-6

ABC 012703

APPENDIX B - SCPI COMMAND/QUERY DEFINITIONS

B.1 INTRODUCTION

This appendix defines the SCPI subsystem commands and queries used with the ABC Power Supply. Subsystem commands are defined in PAR. B.2 through B.90, arranged in groups as they appear in the tree diagram, Figure 3-3. Table B-1 provides a quick reference of all SCPI subsystem commands and queries used in the Interface Card.

TABLE B-1. SCPI SUBSYSTEM COMMAND/QUERY INDEX

COMMAND PAR. COMMAND PAR.

ABORt B.2 [SOUR:]CURR[:LEV][:IMM][:AMP], ? B.48, B.49

CAL:VOLT:GAIN B.3 [SOUR:]CURR[:LEV]:TRIG[:AMP], ? B.50, B.51

CAL:CURR[:DATA] B.4 [SOUR:]CURR:PROT[:LEV], ? B.52, B.53

CAL:PASS, ? B.5 [SOUR:]CURR:PROT:CLE B.54

CAL:CURR:GAIN B.6 [SOUR:]CURR:PROT:TRIP B.55

CAL:STAT, ? B.7, B.8 [SOUR:]CURR:LIM:HIGH, ? B.56, B.57

CAL:VOLT:LEV B.9 [SOUR:]VOLT[:LEV][:IMM][:AMP], ? B.58, B.59

CAL:VOLT[:DATA] B.10 [SOUR:]VOLT[:LEV]:TRIG[:AMP]? B.60, B.61

CAL:ZERO B.11 [SOUR:]VOLT:LIM:HIGH, ? B.62, B.63

DISP:CONT, ? B.12, B.13 [SOUR:]VOLT:PROT:LEV, ? B.64, B.65

DISP:MODE, ? B.14 ,B.15 [SOUR:]VOLT:PROT:CLE B.66

DISP:TEXT, ? B.16, B.17 [SOUR:]VOLT:PROT:TRIP? B.67

INIT[:IMM] B.18 [SOUR:]FUNC:MODE? B.68

INIT:CONT, ? B.19, B.20 STAT:OPER:COND? B.69

INST:STAT B.21 STAT:OPER:ENAB, ? B.70, B.71

[SOUR:]LIST:CURR, ? B.22, B.23 STAT:OPER[:EVENT]? B.72

[SOUR:]LIST:CURR:PROT, ? B.24, B.25 STAT:PRES B.73

[SOUR:]LIST:DWELL, ? B.26, B.27 STAT:QUES[:EVENT]? B.74

[SOUR:]LIST:IND, ? B.28, B.29 STAT:QUES:COND? B.75

[SOUR:]LIST:SEQ:NEXT, ? B.30, B.31 STAT:QUES:ENAB, ? B.76, B.77

[SOUR:]LIST:SEQ:START, ? B.32, B.33 SYST:ERR? B.78

[SOUR:]LIST:VOLT, ? B.34, B.35 SYST:ERR:CODE? B.79, B.80

[SOUR:]LIST:VOLT:PROT, ? B.36, B.37 SYST:KLOCK, ? B.81, B.82

MEAS:CURR? B.38 SYST:LANG, ? B.83, B.84

MEAS:VOLT? B.39 SYST:PASS CEN, DIS B.85, B.86

OUTP[:STAT], ? B.40, B.41 SYST:PASS:STAT B.87

OUTP:PROT:DEL, ? B.42, B.43 SYST:SEC B.88

PROG:STAT, ? B.44, B.45 SYST:SET B.89

READ:CURR? B.46 SYST:VERS? B.90

READ:VOLT? B.47

B.2

ABORt

COMMAND

ABOR

Syntax: Short Form: ABOR Long Form: ABORt

Description: Cancels previously stored trigger levels, resets WTG. The ABORt command cancels any pending

trigger levels previously stored by the CURR:TRIG or VOLT:TRIG commands. The pending level is set equal to the corresponding immediate value. ABORt also resets the WTG (Wait TriGger) bit in the

ABC 012703

B-1

Operation Condition status register. If INIT:CONT ON has been programmed, the trigger system rearms itself immediately after ABORt, thereby setting WTG. WTG is bit 5 in the STATUS OPERATION CONDITION register. The ABORt is executed each time power is turned on. Related Commands: INIT, *RST, *TRG. (See example, Figure B-1.)

NOTES: 1. The power supply is assumed to be operating in constant voltage (CV) mode.

2 Examples below are intended only to illustrate command functions. Refer to PAR. 3.3.5 for pro-

gramming techniques to optimize performance.

OUTP ON Output enabled. OUTP? Power supply returns “1” (output enabled). VOLT 21; CURR 1.5 Power supply output programmed to go to 21V, current limit 1.5A INIT:CONT ON Continuous triggers enabled. INIT:CONT? Power supply returns “1.” VOLT:TRIG 15;CURR:TRIG 3 Power supply output programmed to return to 15V, current limit

3A upon receipt of trigger. *TRG Power supply output returns to 15V,current limit 3A. VOLT 21; CURR 5E-2 Power supply output programmed to go to 21V, current limit 0.05A MEAS:VOLT? If actual value of output voltage is 20.9V, power supply

returns 2.09E+1. MEAS:CURR? If actual value of output current is 0.0483A, power supply

returns 4.83E-2. FUNC:MODE? Returns VOLT if power supply operating in constant voltage

mode, CURR for constant current mode. CURR:TRIG? Returns 3 (current value established by CURR:TRIG. VOLT:TRIG? Returns 15 (voltage value established by VOLT:TRIG. ABOR Pending trigger levels changed to 21V, 0.05A (immediate

values) VOLT 17; CURR 2 Power supply output programmed to

go to 17V, 2A *TRG Power supply output returns to 21V, current limit 0.05A. INIT:CONT 0 Triggers disabled. INIT:CONT? Power supply returns “0.” OUTP OFF Output disabled. OUTP? Returns 0 (output disabled). MEAS:VOLT? Returns 0. (measured output voltage). VOLT? Returns 17.(programmed output voltage)/ CURR? Returns 1.5 (programmed current) CURR? MAX Returns 4 (assuming maximum allowable current for power

supply being addressed is 4A, i.e. ABC 25-4DM). CURR? MIN Returns 0 (minimum allowable current). CURR:PROT 2.6 Current protection set to 2.6A. CURR? Returns 1.5, indicating programmed current value = 1.5A. CURR:PROT? Returns 2.6 , indicating programmed overcurrent protection

current value = 2.6A. CURR:PROT?MAX For ABC 25-4DM, returns 4.4A (see Table 1-2). SYST:VERS? Returns 1997.0.

FIGURE B-1. PROGRAMMING THE OUTPUT

B.3 CALibrate:CURRent:LEVel COMMAND

Syntax: Short Form: CAL:CURR:LEV {MIN | MAX} Long Form: CALibrate:CURRent:LEVel {MIN | MAX}

Description: Selects Current calibration, only effective with power supply in Calibrate status.

CAL:CURR:LEV MIN selects Current Zero Calibration. CAL:CURR:LEV MAX selects Current Full Scale Calibration. Normally Current Zero is done first, then Current Full Scale Calibration. Related Commands: CAL:STAT, CAL:PASS, CAL:VOLT, CAL:CURR, CAL:ZERO, CAL:SAVE. (See example, Figure B-2.)

CAL:CURR:LEV

B-2

ABC 012703

B.4 CALibrate:CURRent[:DATA] COMMAND

Syntax: Short Form: CAL:CURR[:DATA] {0 | 1 | 2 | 3} Long Form: CALibrate:CURRent[:DATA] {0 | 1 | 2 | 3}

Description: Increases or decreases output current during calibration only. CAL:CURR[:DATA] 0 decreases

output current by small increment. CAL:CURR[:DATA] 1 increases output current by small increment. CAL:CURR[:DATA] 2 decreases output current by large increment. CAL:CURR[:DATA] 3 increases output current by large increment. This command is used during current calibration to adjust the output current for current zero calibration as well as full scale current calibration. Output current is monitored on a calibrated digital multimeter (reading voltage at the sense terminals of the shunt resistor) and increased or decreased as required using this command.This command is only effective if Calibration status and either Current Zero or Current Full Scale calibration are active. This command is equivalent to the on the front panel left and right arrow keys for fine adjustment and the 1 and 3 keys for coarse adjustment. Related Commands: CAL:STAT, CAL:PASS, CAL:VOLT, CAL:CURR, CAL:ZERO, CAL:SAVE. CAL:STAT, CAL:PASS, CAL:VOLT, CAL:CURR, CAL:ZERO, CAL:SAVE. (See example, Figure B-2.)

CAL:STAT ON,1234 Power supply enters Calibrate status. CAL:STAT? Returns 1 indicating power supply in Calibrate status. CAL:VOLT:LEV MIN Voltage Zero Calibration selected. CAL:VOLT 1 Output voltage increased CAL:VOLT:LEV MAX Voltage Full Scale Calibration selected, voltage zero values

stored in volatile memory CAL:VOLT 0 Output voltage decreased. CAL:ZERO Output voltage and current set to zero. Voltage maximum

and values establishedanalog to digital conversion values

read calculations performed. Voltage and current output

set to zero.

--- * User disconnects shunt and connects DVM to output. CAL:CURR:LEV MIN Current Zero Calibration selected. CAL:CURR 1 Output current increased CAL:CURR:LEV MAX Current Full Scale Calibration selected, current zero values

stored in volatile memory CAL:CURR 0 Output current decreased. CAL:SAVE Calibration values saved. current maximum values calculated

based on power supply settings an measurements. The

non-volatile current calibration constants are moved to

area of non-voltatile memory reserved for previous

calibration data. New volatile constants are stored in

memory. CAL:STAT 0 Power supply exits Calibrate mode. CAL:STAT? Returns 0 indicating power supply not in Calibrate status

CAL:CURR

FIGURE B-2. USING CALIBRATION COMMANDS AND QUERIES

B.5 CALibrate:PASSword COMMAND

Syntax: Short Form: CAL:PASS new_password (new_password is 4 digits)

Long Form: CALibrate:PASSword new_password (new_password is 4 digits)

Description: Changes the password used to put the power supply in Calibrate status. To execute this com-

mand, the power supply must be in Calibrate status (see CAL:STAT). password = 4 digits, required to enter Calibrate status. Related Commands: CAL:PASS, CAL:VOLT, CAL:CURR, CAL:ZERO, CAL:SAVE. (See example, Figure B-2.)

ABC 012703

CAL:PASS

B-3

B.6 CALibrate:SAVE COMMAND

Syntax: Short Form: CAL:SAVE Long Form: CALibrate:SAVE

Description: Saves computed calibration values in non-volatile memory. The Analog to Digital (A/D) converter

is read to establish the final values of the calibration state. For example, if VOLT:MAX was the last calibration state, the voltage A/D converter is read and the volts per step multiplier is calculated. The voltage per step for the voltage Digital to Analog (D/A) converter is also calculated and the non-voltaile memory is updated from the volatile calibration constants. Previous values are not lost, and can be restored using Local mode (see PAR. 4.5 ). This command should be the last command before exiting Calibrate status. CAL:STAT, CAL:PASS, CAL:VOLT, CAL:CURR, CAL:ZERO, CAL:SAVE. (See example, Figure B-2.)

CAL:SAVE

B.7 CALibrate:STATus COMMAND

Syntax: Short Form: CAL:STAT <boolean>[,password]

Long Form: CALibrate:STATus <boolean>[,password] where boolean = 0 or OFF, 1 or ON, password = 4 digits, required if<boolean = 1 or ON>

Description: Sets the power supply to Calibrate status. <boolean> 1 or ON causes power supply to enter Cali-

brate status. <boolean> 0 or OFF causes power supply to exit Calibrate status. Upon entering Calibrate status the current calibration constants are stored in the volatile memory. If the state is 0, the non-volatile calibration constants are supplied to the ASC working calibration. password = 4 digits, required to enter Calibrate status. If the wrong password is entered, error message -224 is posted to the queue. Related Commands: CAL:PASS, CAL:VOLT, CAL:CURR, CAL:ZERO, CAL:SAVE. (See example, Figure B-2.)

B.8 CALibrate:STATus? QUERY

Syntax: Short Form: CAL:STAT? Long Form: CALibrate:STATus?

Return Value: <boolean> (boolean = 0 or OFF, 1 or ON)

Description: Identifies whether the power supply is in Calibrate status. 1 indicates power supply is in Calibrate

status. 0 indicates power supply is not in Calibrate status. (See example, Figure B-2.)

B.9 CALibrate:VOLTage:LEVel COMMAND

Syntax: Short Form: CAL:VOLT:LEV {MIN | MAX} Long Form: CALibrate:VOLTage:LEVel {MIN | MAX}

Description: Selects Voltage calibration, only effective with power supply in Calibrate status.

CAL:VOLT:LEV MIN selects Voltage Zero Calibration. CAL:VOLT:LEV MAX selects Voltage Full Scale Calibration. Normally Voltage Zero is done first, then Voltage Full Scale Calibration. CAL:VOLT:MAX causes the maximum value to be read and saved in calibration xx. The power supply then raises the output level to maximum and waits for CAL:VOLT[:DATA] commands. Related Commands: CAL:STAT, CAL:PASS, CAL:VOLT, CAL:CURR, CAL:ZERO, CAL:SAVE. (See example, Figure B-2.)

CAL:VOLT:LEV

CAL:STAT

CAL:STAT?

B.10 CALibrate:VOLTage[:DATA] COMMAND

Syntax: Short Form: CAL:VOLT[:DATA] {0 | 1 | 2 | 3} Long Form: CALibrate:VOLTage[:DATA] {0 | 1 | 2 | 3}

Description:

B-4

Increases or decreases output voltage during calibration only.

CAL:VOLT[:DATA] 0 decreases output voltage by small increment. CAL:VOLT[:DATA] 1 increases output voltage by small increment. CAL:VOLT[:DATA] 2 decreases output voltage by large increment. CAL:VOLT[:DATA] 3 increases output voltage by large increment. This command is used during voltage calibration to adjust the output voltage for voltage zero calibration as well as full scale voltage calibration. Output voltage is monitored on a calibrated digital multimeter and increased or decreased as required using this command. This command is only effective if Calibration status and either Voltage Zero or Voltage Full Scale calibration are active. This command is equivalent to the front panel left and right arrow keys for fine adjustment and the 1 and 3 keys for coarse adjustment. Related Commands: CAL:STAT, CAL:PASS, CAL:VOLT, CAL:CURR, CAL:ZERO, CAL:SAVE. (See example, Figure B-2.)

CAL:VOLT

ABC 012703

B.11 CALibrate:ZERO

Syntax: Short Form: CAL:ZERO Long Form: CALibrate:ZERO

Description: Sets output to zero while calibration equipment connections are changed.This command is used when

changing from Voltage to Current calibration or vice-versa. CAL:ZERO sets output voltage and current to zero. The user then connects or disconnects the shunt resistor or the digital voltmeter from the output terminals of the power supply as required for the subsequent Voltage or Current calibration. The next command should select the new parameter to be calibrated. Related Commands: CAL:STAT, CAL:VOLT, CAL:CURR, CAL:SAVE. (See example, Figure B-2.)

COMMAND

CAL:ZERO

B.12 DISPlay:CONTrast COMMAND

Syntax: Short Form: DISP:CONT <num_value> (0 to 1)

Long Form: DISPlay:CONTrast <num_value> (0.0 to 1.0)

Description: Sets the contrast of the front panel LCD. The contrast value from (0.1 to 0.9) is stored in the non-

volatile memory and is retained when the power supply is turned off. A contrast value of 0 is best when looking up at the display, 1 is best when looking down at the display. Values in between provide adjustment for optimum viewing. Setting the values to 0.1 or 0.9 are not reported back and are rounded to 0 oe 1 respectively. Related Commands: DISP:CONT?. (See example, Figure B-3.)

DISP:CONT 0.9 Sets LCD contrast value to 0.9. DISP:CONT? Returns 0.9. DISP:MODE NORM Changes LCD to Normal metering mode. DISP:MODE? Returns NORMAL. DISP:MODE TEXT Changes LCD to Text mode. DISP:TEXT “**ABC IS IN USE” Second line of display reads **ABC IS IN USE. DISP:MODE? Returns “TEXT” DISP:TEXT? Returns “**ABC IS IN USE”

FIGURE B-3. USING DISPLAY COMMANDS

B.13 DISPlay:CONTrast? QUERY

Syntax: Short Form: DISP:CONT? Long Form: DISPlay:CONTrast?

Return Value: Numerical value from 0 to 1 indicating contrast setting.

DISP:CONT

DISP:CONT?

Description: Identifies LCD contrast setting. Returns 0 if LCD is at minimum setting, 1 if at maximum setting.

Cand= return values between 0.2 through 0.8 for other contrast settings. Related Commands: DISP:CONT. (See example, Figure B-3.)

B.14 DISPlay:MODE COMMAND

Syntax: Short Form: DISP:MODE NORM or DISP:MODE TEXT

Long Form:: DISPlay:MODE NORMal or DISPlay:MODE TEXT

Description: Switches the LCD display between Normal and Text mode. Switches the display between its nor-

mal metering mode and a mode in which it displays text sent by the user on the second line. The default status at power up or after *RST is NORMal. In order to display text on the second line the display mode has to be changed to TEXT. Related Commands: DISP:MODE?, DISP:TEXT, DISP:TEXT?, *RST. (See example, Figure B-3.)

B.15 DISPlay:MODE? QUERY

Syntax: Short Form: DISP:MODE? Long Form: DISPlay:MODE?

Return Value: NORMAL or TEXT.

Description: Identifies the LCD mode. Returns NORMAL when the display is in normal mode, TEXT when the dis-

play is in text mode. Related Commands: DISP:MODE, DISP:TEXT, *RST. (See example, Figure B-3.)

ABC 012703

DISP:MODE

DISP:MODE?

B-5

B.16 DISPlay:TEXT COMMAND

Syntax: Short Form: DISP:TEXT[:DATA] <char_string> Long Form: DISPlay:TEXT [:DATA] <char_string>

Description: Allows entry of character string to be viewed when LCD display is set to Text mode. Allows for

character strings of maximum 16 characters to be displayed (on the second line of the LCD) when the display mode is TEXT, e.g., DO NOT TOUCH or ABC IS IN USE, etc. The LCD has the following character set: A to Z, 0 to 9 and special characters as < > + - / = : ... If the message exceeds the display capacity only the first 16 characters will be displayed and no error message will be generated. Upon executing *RST, character string set to 16 spaces:” “. Related Commands: DISP:TEXT?, DISP:MODE, DISP:MODE?, *RST. (See example, Figure B-3.)

DISP:TEXT

B.17 DISPlay:TEXT? QUERY

Syntax: Short Form: DISP:TEXT? Long Form: DISPlay:TEXT]?

Return Value: Character string displayed on second line of LCD display.

Description: Returns the text displayed on second line of LCD in TEXT mode. When the display set to TEXT

mode, returns the character string entered by DISP:TEXT. If the display set to NORMAL mode, returns information displayed on second line of display. (This can be used to see the monitored values presently being displayed on the second line of the LCD.) Related Commands: DISP:MODE, DISP:TEXT, *RST. (See example, Figure B-3.)

B.18 INITiate[:IMMediate] COMMAND

Syntax: Short Form: INIT:[IMM] Long Form: INITiate[:IMMediate]

Description: Enables a single trigger. If INIT:CONT is OFF, then INIT[:IMM] arms the trigger system for a single

trigger. If INIT:CONT is ON, then the trigger system is continuously armed and INIT[:IMM] is redundant. This command enables a single trigger. A GPIB <GET>, *TRG or command completes the sequence. Upon receipt of the <GET> or *TRG command, the power supply will return to the programmed values of voltage and current established by the VOLT:TRIG and CURR:TRIG commands. After a GPIB <GET> or *TRG command has been received, subsequent GPIB <GET>, *TRG commands have no effect unless preceded by INIT or INIT:CONT ON. Related Commands: <GET>, *RST, *TRG. (See example, Figure B-1.)

B.19 INITiate:CONTinuous COMMAND

Syntax: Short Form: INIT:CONT {ON | OFF} or {1 | 0} ( 1 = on, 0 = off)

Long Form: INITiate:CONTinuous {ON | OFF} or {1 | 0} ( 1 = on, 0 = off)

DISP:TEXT?

INIT[:IMM]

INIT:CONT

Description: INIT:CONT ON enables continuous triggers.; INIT:CONT OFF disables continuous triggers. If

INIT:CONT is OFF, then INIT[:IMM] arms the trigger system for a single trigger. If INIT:CONT is ON, then the trigger system is continuously armed and INIT[:IMM] is redundant. Executing *RST command sets INIT:CONT to OFF. (See example, Figure B-1.)

B.20 INITiate:CONTinuous QUERY

Syntax: Short Form: INIT:CONT? Long Form: :INITiate:CONTinuous?

Return Value: 1 or 0

Description: Determines whether continuous triggers are enabled or disabled. Power supply returns value of

INIT:CONT flag: “1” = continuous triggers are enabled (INIT:CONT ON); “0” = continuous triggers disabled (INIT:CONT OFF). (See example, Figure B-1.)

B.21 INSTrument:STATe COMMAND

Syntax: Short Form :INST:STAT <val> Long Form: INSTrument:STATe <val>

Description: Operation is identical to OUTPut:STATe command (PAR. B.40) and is provided for compatibility with

other vendors products.

B-6

INIT:CONT?

INST:STAT

ABC 012703

B.22 LIST:CURRent COMMAND

Syntax: Short Form: LIST:CURR[:LEV] <exp_value> Long Form: LIST:CURRent[:LEVel] <exp_value>

<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Sets the current (Amps) value for the memory location selected by LIST:IND. If the value is out of

the acceptable current range for the power supply model, an error message: -222,"Data out of range" is posted in the output queue. The current value is stored in non-volatile memory and is retained when the power supply is turned off. Related Commands: LIST:IND. LIST:IND?, LIST:CURR?. (See example, Figure B-4.)

LIST:CURR

B.23 [SOUR:]LIST:CURRent? QUERY

Syntax: Short Form: LIST:CURR[:LEV]? Long Form: LIST:CURRent[:LEVel]?

Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Returns current value (Amps) stored in indexed memory location selected by LIST:IND. Related

Commands: LIST:IND. LIST:IND?, LIST:CURR. (See example, Figure B-4.)

B.24 [SOUR:]LIST:CURRent:PROTect COMMAND

Syntax: Short Form: LIST:CURR:PROT<num_value> Long Form: LIST:CURRent:PROTect <num_value>

<num_value> = digits with decimal point and Exponent

Description: Sets the current protection (Amps) value for the memory location selected by LIST:IND. If the

value is out of the acceptable current range for the power supply model, an error message:

-222,"Data out of range" is posted in the output queue. The current value is stored in non-volatile memory and is retained when the power supply is turned off. Related Commands: LIST:IND. LIST:IND?, LIST:CURR:PROT?. (See example, Figure B-4.)

LIST:IND 21 Selects memory location 21. LIST:IND? Returns 21. LIST:CURR 2.35E-1 Sets output current value of memory location 21 to 0.235A. LIST:CURR? Returns 2.35E-1. LIST:CURR:PROT 1.67E+1 Sets output current value of memory location 21 to 16.7A. LIST:CURR:PROT? Returns 1.67E+1. LIST:VOLT:PROT 2.77E+1 Sets voltage protection value of memory location 21 to 27.7V. LIST:VOLT:PROT? Returns 2.77E+1. LIST:DWEL 0.6 Sets memory location 21 time value to 0.6 second. During program

execution, after parameters specified by memory location 21 have been applied for 0.6 second, power supply will switch to parameters specified by memory location 21 sequence number.

LIST:SEQ:NEXT 39 Sets memory location sequence number to 39. During program

execution, when memory location 21 is complete, the next location

to be executed will be 39. LIST:SEQ:NEXT? Returns 39. LIST:IND 22 Selects memory location 22 . LIST:IND? Returns 22. LIST:VOLT 1.256E+2 Sets output voltage value of memory location 22 to 125.6V. LIST:VOLT? Returns 1.256E+2. LIST:SEQ:STAR 21 Sets memory location 21 as the starting location for executing a

program. LIST:SEQ:STAR? Returns 21. PROG:SEL:STAT RUN Sequence starting at location 21 and ending at location 22 will be run

continuously

PROG:SEL:STAT STOP Programmed sequence stops running.

LIST:CURR:PROT

LIST:CURR?

ABC 012703

FIGURE B-4. USING LIST COMMANDS AND QUERIES

B-7

B.25 [SOUR:]LIST:CURRent:PROTect? QUERY

Syntax: Short Form: LIST:CURR[:LEV]? Long Form: LIST:CURRent[:LEVel]?

Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Returns current protection value (Amps) stored in indexed memory location selected by

LIST:IND. Related Commands: LIST:IND. LIST:IND?, LIST:CURR. (See example, Figure B-4.)

LIST:CURR:PROT?

B.26 [SOUR:]LIST:DWELl COMMAND

Syntax: Short Form: LIST:DWEL <value> (0.01 to 300) Long Form: LIST:DWELl <value> (0.01 to 300)

Description: Determines the execution time duration during a programmed sequence for the memory loca-

tion selected by LIST:IND. Sets time value (from 0.01 to 300) in seconds for memory location selected by LIST:IND. A value of 0 means that this memory location will be skipped during the RUN command (LOCal mode). The time value is stored in non-volatile memory and is retained when the power supply is turned off. Related Commands: LIST:IND. LIST:IND?, LIST:DWEL?, LIST:SEQ. (See example, Figure B-4.)

B.27 [SOUR:]LIST:DWELl? QUERY

Syntax: Short Form: LIST:DWEL? Long Form: LIST:DWELl?

Return Value: <value> (0.01 to 300)

B.28 [SOUR:]LIST:INDex COMMAND

Syntax: Short Form: LIST:IND <int_value> (from 1 to 40) Long Form: LIST:INDex <int_value> (from 1 to 40)

Description: Selects one 40 memory locations for viewing or modification of parameter selected by subse-

quent LIST:CURR, LIST:CURR:PROT, LIST:VOLT, LIST:VOLT:PROT commands or queries. The index value (the selected memory location) is stored in non-volatile memory and is retained when the power supply is turned off. Related Commands: LIST:IND?. (See example, Figure B-4.)

B.29 [SOUR:]LIST:INDex? QUERY

Syntax: Short Form: LIST:IND? Long Form: LIST:INDex?

Return Value: <int_value> 1 to 40

LIST:DWEL

LIST:DWEL?

LIST:IND

LIST:IND?

Description: Returns index value. Identifies which one 40 memory locations has been selected for viewing or

modification by subsequent LIST:CURR, LIST:CURR:PROT, LIST:VOLT, LIST:VOLT:PROT commands or queries. Related Commands: LIST:IND?. (See example, Figure B-4.)

B.30 [SOUR:]LIST:SEQuence:NEXT COMMAND

Syntax: Short Form: LIST:SEQ:NEXT <int_value> (0 to 40)

Long Form: LIST:SEQuence:NEXT <int_value> (0 to 40)

Description: Determines the next memory location to be addressed during a programmed sequence.Sets

sequence number (from 1 to 40) of next memory location to be addressed. Sequence number is set for memory location selected by LIST:IND. Setting sequence number to 0 indicates the end of the program chain, and the programmed sequence will stop. The sequence number is stored in non-volatile memory and is retained when the power supply is turned off. Related Commands: LIST:IND. LIST:IND?, LIST:SEQ?. (See example, Figure B-4.)

B.31 [SOUR:]LIST:SEQuence:NEXT? QUERY

Syntax: Short Form: LIST:SEQ:NEXT? Long Form: LIST:SEQuence:NEXT?

Return Value: <int_value> (0 to 40)

Description: Returns sequence number stored in memory location selected by LIST:IND. Related Com-

mands: LIST:IND. LIST:IND?, LIST:SEQ. (See example, Figure B-4.)

LIST:SEQ:NEXT

LIST:SEQ:NEXT?

B-8

ABC 012703

B.32 [SOUR:]LIST:SEQuence:STARt COMMAND

Syntax: Short Form: LIST:SEQ:STAR <int_value> (1 to 40)

Long Form: LIST:SEQuence:STARt <int_value> (1 to 40)

Description: Determines the first memory location (start of sequence) to be addressed during a pro-

grammed sequence. Sets memory location (from 1 to 40) of first memory location to be addressed when a program (chain of memory locations) is executed. This is the start address for the STEP and RUN commands (LOCal mode). The starting sequence number is stored in non-volatile memory and is retained when the power supply is turned off. Related Commands: LIST:SEQ:STAR?. (See example, Figure B-4.)

LIST:SEQ:STAR

B.33 [SOUR:]LIST:SEQuence:STARt? QUERY

Syntax: Short Form: LIST:SEQ:STAR? Long Form: LIST:SEQuence:STARt?

Return Value: <int_value) between 1 and 40

Description: Identifies the starting address for program execution. Returns the starting sequence location set

by LIST:SEQ:STAR command. Related Commands: LIST:SEQ:STAR. (See example, Figure B-4.)

B.34 [SOUR:]LIST:VOLTage COMMAND

Syntax: Short Form: LIST:VOLT[:LEV] <exp_value> Long Form: LIST:VOLTage[:LEVel] <exp_value>

<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Sets the voltage value for the memory location selected by LIST:IND. If the value is out of the

acceptable voltage range for the power supply model, an error message: -222,"Data out of range" is posted in the output queue. The voltage value is stored in non-volatile memory and is retained when the power supply is turned off. Related Commands: LIST:IND. LIST:IND?, LIST:VOLT? (See example, Figure B-4.)

B.35 [SOUR:]LIST:VOLTage? QUERY

Syntax: Short Form: LIST:VOLT[:LEV]? Long Form: LIST:VOLTage[:LEVel]?

Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Returns voltage value stored in indexed memory location selected by LIST:IND. Related Com-

mands: LIST:IND. LIST:IND?, LIST:VOLT. (See example, Figure B-4.)

LIST:SEQ:STAR?

LIST:VOLT

LIST:VOLT?

B.36 [SOUR:]LIST:VOLTage:PROTect COMMAND

Syntax: Short Form: LIST:VOLT:PROT<exp_value> Long Form: LIST:VOLTage:PROTect <exp_value>

<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Sets the voltage protection value for the indexed memory location selected by LIST:IND.If the

value is out of the acceptable voltage range for the power supply model, an error message:

-222,"Data out of range" is posted in the output queue. The voltage value is stored in non-volatile memory and is retained when the power supply is turned off. Related Commands: LIST:IND. LIST:IND?, LIST:VOLT:PROT?. (See example, Figure B-4.)

B.37 [SOUR:]LIST:VOLTage:PROTect QUERY

Syntax: Short Form: LIST:VOLT[:LEV]? Long Form: LIST:VOLTage[:LEVel]?

Return Value: <num_value> (digits with decimal point and Exponent)

Description: Returns voltage protection value stored in indexed memory location selected by LIST:IND.

Related Commands: LIST:IND. LIST:IND?, LIST:VOLT. (See example, Figure B-4.)

ABC 012703

LIST:VOLT:PROT

LIST:VOLT:PROT?

B-9

B.38 MEASure[:SCALar]:CURRent[:DC]? QUERY

Syntax: Short Form: MEAS[:SCAL]:CURR[:DC]? Long Form: MEASure[:SCALar]:CURRent[:DC]?

Return Value: <num_value> (digits with decimal point and Exponent)

Description: Measures actual current. This query returns the actual value of output current (measured at the out-

put terminals) as determined by the programmed value of voltage and current and load conditions. NOTE: The SCPI convention for this command allows the controller to establish the range and accuracy of the measurement if nn,nn is added after the question mark; the power supply accepts this format but sets the command warning bit (13) in the status questionable register and ignores the extra characters. (See example, Figure B-1.)

MEAS:CURR?

B.39 MEASure[:VOLTage][:SCALar][:DC]? QUERY

Syntax: Short Form: MEAS[:SCAL]:VOLT[:DC]? Long Form: MEASure[:SCALar]:VOLTage[:DC]?

Description: Measures actual voltage. This query returns the actual value of output voltage (measured at the out-

B.40 OUTPut[:STATe] COMMAND

Syntax: Short Form: OUTP[:STAT] <boolean> Long Form: OUTPut[:STATe] <boolean>

<boolean>=(0 or OFF, 1 or ON)

Description: Enables or disables the power supply output. Upon power up the output is enabled (OUTP ON).

When OUTP OFF is executed, the programmed values of voltage and current are saved, then voltage and current are programmed to 0. When OUTP ON is executed, the power supply output is restored to the previously saved programmed values. The saved values of voltage and current can be viewed by VOLT? and CURR? queries. Related Commands: OUTP?. (See example, Figure B-1.)

B.41 OUTPut[:STATe] QUERY

Syntax: Short Form: OUTP[:STAT]? Long Form: OUTPut[:STATe]?

Return Value: <int_value> (0 or 1)

Description: Indicates whether power supply output is enabled or disabled. Returns 0 if output disabled,

returns 1 if output enabled. Related Commands: OUTP. (See example, Figure B-1.)

MEAS:VOLT?

OUTP

OUTP?

B.42 OUTPut:PROTection:DELay COMMAND

Syntax: Short Form: OUTP:PROT:DEL <n.n> Long Form: OUTPut:PROTection:DELay <n.n>

where n.n = seconds

Description: Delays tripping of overvoltage/overcurrent protection. The overvoltage and overcurrent protection

can be programmed to trip immediately upon detection of an overvoltage/overcurrent condition, or can be delayed approximately 8 seconds. This delay is set in increments of 0.033 milliseconds If delay is programmed, overcurrent/overvoltage protection trips only if condition still present at end of delay. A count of 0 means no delay, the maximum delay possible is 8.50 seconds.

B.43 OUTPut:PROTection:DELay QUERY

Syntax: Short Form: OUTP:PROT:DEL? Long Form: OUTPut:PROTection:DELay?

Return Value: <integer 1 to 8.5>

Description: Returns value of overvoltage/overcurrent delay. A count of 0 means no delay, The maximum

value is 8.5. The delay constants are set in -.033 milliseconds per internal value. Related Commands: OUTP:PROT:DEL. (See example, Figure B-5.)

B-10

OUTP:PROT:DEL

OUTP:PROT:DEL?

ABC 012703

B.44 PROGram:SELect:STATe COMMAND

Syntax: Short Form: PROG:SEL:STAT {RUN | STOP}

Long Form: PROGram:SELect:STATe {RUN | STOP}

Description: Starts or stops user programmed sequence. Program sequence is preprogrammed using LIST

commands, starting address is is established by LIST:SEQ:STAR. When PROG:SEL:STAT command is executed the keyboard is locked until the program stops running. *RST command aborts a program that is running. Related commands: PROG:SEL:STAT?, LIST:CURR, LIST:CURR:PROT, LIST:VOLT, LIST:VOLT:PROT, LIST:DWEL, LIST:SEQ:NEXT, LIST:SEQ:STAR

PROG:SEL:STAT

B.45 PROGram:SELect:STATe? QUERY

Syntax: Short Form: PROG:SEL:STAT? Long Form: PROGram:SELect:STATe?

Return value: <boolean> (0 = stopped, 1 = running)

Description: Indicates status of user progammed sequence. 1 returned when program is running. 0 returned

when program is stopped. Related commands: PROG:STAT

B.46 READ[:SCALar]:CURRent[:DC]? QUERY

Syntax: Short Form: READ[:SCAL]:CURR[:DC]? Long Form: READ[:SCALar]:CURRent[:DC]?

Return Value: <num_value> (digits with decimal point and Exponent)

Description: Measures actual current. Same as MEAS:CURR? (see PAR. B.38)

B.47 READ[:VOLTage][:SCALar][:DC]? QUERY

Syntax: Short Form: READ[:SCAL]:VOLT[:DC]? Long Form: READ[:SCALar]:VOLTage[:DC]?

Description: Measures actual voltage. Same as MEAS:VOLT? (see PAR. B.39)

B.48 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude] COMMAND

Syntax: Short Form: [SOUR:]CURR[:LEV][:IMM][:AMP] <exp_value>

Long Form: [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude] <exp_value> <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Sets programmed current level at power supply output. This command programs output current to

a specific value; actual output current will depend on load conditions. If the value exceeds the maximum for the model being programmed, error message -222,”Data out of range” is posted in output queue. If value programmed exceeds the CURR:LIM:HIGH value, a value corresponding to the current limit will be programmed. Related Commands: *RCL, *SAV, CURR:LIM:HIGH. (See example, Figure B-1.)

PROG:SEL:STAT?

READ:CURR?

READ:VOLT?

CURR

B.49 [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude] QUERY

Syntax: Short Form: [SOUR:]CURR[:LEV][:IMM][:AMP]? MIN, MAX

Long Form: [SOURce:]CURRent[:LEVel][:IMMediate][:AMPlitude]? MIN, MAX Return Value:<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Returns either the programmed value, maximum value, or minimum value of current. The

CURR? query returns the programmed value of current. Actual output current will depend on load conditions. The CURR?MAX query returns the maximum current allowed for a particular model. CURR? Returns programmed current value. CURR? MAX returns maximum current allowed for power supply. CURR? MIN returns minimum current allowed for power supply (always 0). Related Commands: CURR. (See example, Figure B-1.)

B.50 [SOURce:]CURRent:[:LEVel]TRIGgered[:AMPlitude] COMMAND

Syntax: Short Form: [SOUR:]CURR[:LEV]:TRIG[:AMP] <exp_value>

Long Form: [SOURce:]CURRent[:LEVel]:TRIGgered[:AMPlitude] <exp_value> <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Programs current value to be transferred to output by *TRG commands. Actual output current

will depend on load conditions. If the value exceeds the maximum for the model being programmed,

ABC 012703

CURR:TRIG

CURR?

B-11

error message -222,”Data out of range” is posted in output queue. If value exceeds CURR:LIM:HIGH value, a value corresponding to the current limit will be programmed. Related Commands: CURR. (See example, Figure B-1.)

B.51 [SOURce:]CURRent:[:LEVel]TRIGgered[:AMPlitude]? QUERY

Syntax: Short Form: [SOUR:]CURR[:LEV]:TRIG[:AMP]?

Long Form: [SOURce:]CURRent[:LEVel]:TRIGgered[:AMPlitude]? Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Returns the current value established by CURR:TRIG command. (See example, Figure B-1.)

B.52 [SOURce:]CURRent:PROTection[:LEVel] COMMAND

Syntax: Short Form: [SOUR:]CURR:PROT[:LEV] <exp_value>

Long Form: [SOURce:]CURRent:PROTection[:LEVel] <exp_value> <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Sets overcurrent protection level for power supply. If the value is out of the acceptable overcurrent

range for the power supply model, error message -222,"Data out of range" is posted in the output queue. If the power supply output exceeds the current protection level programmed, then the power supply output is disabled (programmed to 0) and the OV bit in the Questionable Condition status register is set. An overcurrent condition can be cleared with the CURR:PROT:CLE command. The current protection level can be programmed independently of the output current level. Setting current protection to a value lower than the output current causes the current protection mechanism to trigger after the delay established by OUTP:PROT:DEL command. (See example, Figure B-5.)

NOTES: 1. The power supply is assumed to be operating in constant voltage (CV) mode.

2 Examples below are intended only to illustrate command functions. Refer to PAR. 3.3.5 for

programming techniques to optimize performance

CURR:TRIG?

CURR:PROT

VOLT 21; CURR 1.1 Power supply programmed to voltage limit 21V, 1.1A. CURR? Returns 1.1. CURR:LIM:HIGH 3.3 Current limit set to 3.3A. CURR:LIM:HIGH? Returns 3.3. CURR 4.2 Power supply output current programmed to 3.3A, error message

-301 posted. CURR? Returns 3.3. OUTP:PROT:DEL 0 Protection will trip immediately upon detection of overvoltage or

overcurrent condition. OUTP:PROT:DEL? Returns 0. CURR:PROT:TRIP? 0 indicating overcurrent protection not tripped.

--- OVERCURRENT CONDITION (1 SECOND) OCCURS. CURR:PROT:TRIP? 1 indicating overcurrent protection tripped. CURR:PROT:CLE Overcurrent condition cleared. CURR:PROT:TRIP? 0 indicating overcurrent condition not tripped. CURR? Returns small value (approx. 1% of full scale current rating). OUTP:PROT:DEL 7.47 Protection will trip if overvoltage or overcurrent condition still

present approx. 0.575 seconds after detection. OUTP:PROT:DEL? Returns 7.50. CURR 2.5 Power supply output current programmed to 2.5A

--- OVERCURRENT CONDITION (1 SECOND) OCCURS. (After 10 seconds) CURR:PROT:TRIP? 0 indicating overcurrent condition not tripped. CURR? Returns 2.5.

B-12

FIGURE B-5. PROGRAMMING CURRENT

ABC 012703

B.53 [SOURce:]CURRent:PROTection[:LEVel]?

Syntax: Short Form: [SOUR:]CURR:PROT[:LEV]? {MIN | MAX}

Long Form: [SOURce:]CURRent:PROTection[:LEVel]? {MIN | MAX} Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Returns value representing current protection level.CURR:PROT? returns value set by

CURR:PROT. CURR:PROT?MAX returns maximum current protection value (see Table 1-2). This value is determined at the factory and cannot be changed by the user. CURR:PROT?MIN returns the minimum current protection value (always 0). (See example, Figure B-5.)

QUERY

CURR:PROT?

B.54 [SOURce:]CURRent:PROTection:CLEar COMMAND

Syntax: Short Form: [SOUR:]CURR:PROT:CLE Long Form: [SOURce:]CURRent:PROTection:CLEar

Description: Clears overcurrent condition.Output programmed to 0V; current limit programmed to small value

(approximately 1% of full scale current rating). Overcurrent Protection Tripped is reset so that CURR:PROT:TRIP? returns 0. Related Commands: CURR:PROT, CURR:PROT:TRIP?. (See example, Figure B-5.)

B.55 [SOURce:]CURRent:PROTection:TRIPped? QUERY

Syntax: Short Form: [SOUR:]CURR:PROT:TRIP? Long Form: [SOURce:]CURRent:PROTection:TRIPped?

Return Value: 0 or 1.

Description: Identifies whether overcurrent condition was detected. 0 if overcurrent protection tripped. 1 if

overcurrent protection not tripped. Related Commands: CURR:PROT, CURR:PROT:CLE. (See example, Figure B-5.)

B.56 [SOURce:]CURRent:LIMit:HIGH Command

Syntax: Short Form: [SOUR:]CURR:LIM:HIGH <exp_value>

Long Form: [SOURce:]CURRent:LIMit:HIGH <exp_value> <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Sets limit for maximum power supply output current. If the value is out of the acceptable current

range for the power supply model, error message -222,"Data out of range" is posted in the output queue. If the user tries to set an output current value larger than the CURR:LIM:HIGH setting, a value corresponding to the current limit will be programmed and error message -301,"Value bigger than limit" is posted in the output queue. NOTE: If the current limit is changed, any previously established trigger levels higher than the new limit must be reprogrammed to be lower than the new limit; otherwise triggers will cause the output to exceed the new limit. Once the limit is established, the unit will not accept trigger values higher than the programmed limit. Related Commands: CURR. (See example, Figure B-5.)

CURR:PROT:CLE

CURR:PROT:TRIP?

CURR:LIM:HIGH

B.57 [SOURce:]CURRent:LIMit:HIGH? Query

Syntax: Short Form: [SOUR:]CURR:LIM:HIGH? Long Form: [SOURce:]CURRent:LIMit:HIGH?

Return Value:<exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Returns value representing current limit set by CURR:LIM:HIGH command. Related Commands:

CURR:LIM:HIGH, CURR. (See example, Figure B-5.)

B.58 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude] COMMAND

Syntax: Short Form: [SOUR:]VOLT[:LEV][:IMM][:AMP] <exp_value>

Long Form: [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude] <exp_value> <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Sets programmed voltage level at power supply output. This command programs output voltage

to a specific value; actual output voltage will depend on load conditions. If the value exceeds the maximum for the model being programmed, error message -222,”Data out of range” is posted in output queue. If value programmed exceeds the VOLT:LIM:HIGH value, a value corresponding to the voltage limit will be programmed. Related Commands: *RCL, *SAV, VOLT:LIM:HIGH. (See example, Figure B-1.

ABC 012703

CURR:LIM:HIGH?

VOLT

B-13

B.59 [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude]? QUERY

Syntax: Short Form: [SOUR:]VOLT[:LEV][:IMM][:AMP]? {MIN | MAX}

Long Form: [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPlitude]? {MIN | MAX}

Description: Identifies programmed voltage, maximum allowable voltage, or miniimum voltage (always 0).

The VOLT? query returns the programmed value of voltage. Actual output voltage will depend on load conditions. The VOLT?MAX query returns the maximum voltage allowed for a particular model (e.g., 25V for ABC25-4DM). VOLT? MINReturns minimum voltage allowed for power supply (always 0). Related Commands: VOLT. (See example, Figure B-6

VOLT?

B.60 [SOURce:]VOLTage:[:LEVel]TRIGgered[:AMPlitude] COMMAND

Syntax: Short Form: [SOUR:]VOLT[:LEV]:TRIG[:AMP] <exp_value>

Long Form: [SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPlitude] <exp_value> <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Programs voltage value to be transferred to output by *TRG commands. Actual output voltage

will depend on load conditions. If the value exceeds the maximum for the model being programmed, error message -222,”Data out of range” is posted in output queue. If value exceeds VOLT:LIM:HIGH value, a value corresponding to the voltage limit will be programmed. (See example, Figure B-1.)

B.61 [SOURce:]VOLTage:[:LEVel]TRIGgered[:AMPlitude]? QUERY

Syntax: Short Form: [SOUR:]VOLT[:LEV]:TRIG[:AMP]?

Long Form: [SOURce:]VOLTage[:LEVel]:TRIGgered[:AMPlitude]? Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Returns value representing voltage value to be programmed by *TRG command established by

VOLT:TRIG command). (See example, Figure B-1.)

B.62 [SOURce:]VOLTage:LIMit:HIGH COMMAND

Syntax: Short Form: [SOUR:]VOLT:LIM:HIGH <exp_value>

Long Form: [SOURce:]VOLTage:LIMit:HIGH <exp_value> <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Sets voltage limit for power supply output. If the value is out of the acceptable voltage range for

the power supply model, error message -222,"Data out of range" is posted in the output queue. If the user tries to set an output voltage level larger than the VOLT:LIM:HIGH setting, a value corresponding to the voltage limit will be programmed and error message -301,"Value bigger than limit" is posted in the output queue. NOTE: If the voltage limit is changed, any previously established trigger levels higher than the new limit must be reprogrammed to be lower than the new limit; otherwise triggers will cause the output to exceed the new limit. Once the limit is established, the unit will not accept trigger values higher than the programmed limit. Related Commands: VOLT. (See example, Figure B-6.)

VOLT:LIM:HIGH

VOLT:TRIG

VOLT:TRIG?

B.63 [SOURce:]VOLTage:LIMit:HIGH? QUERY

Syntax: Short Form: [SOUR:]VOLT:LIM:HIGH? Long Form: [SOURce:]VOLTage:LIMit:HIGH?

Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

B.64 [SOURce:]VOLTage:PROTection[:LEVel] COMMAND

Syntax: Short Form: [SOUR:]VOLT:PROT[:LEV] <exp_value>

Long Form: [SOURce:]VOLTage:PROTection[:LEVel] <exp_value> <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Sets overvoltage protection level for power supply.If the value is out of the acceptable overvoltage

range for the power supply model, error message -222,"Data out of range" is posted in the output queue. If the power supply output exceeds the voltage protection level programmed, then the power supply output is disabled (programmed to 0) and the OV bit in the Questionable Condition status register is set. An overvoltage condition can be cleared with the VOLT:PROT:CLE command. The voltage protection level can be programmed independently of the output voltage level. Setting voltage protection to a value lower than the output voltage causes the voltage protection mechanism to trigger immediately. (See example, Figure B-6.)

B-14

VOLT:LIM:HIGH?

VOLT:PROT

ABC 012703

B.65 [SOURce:]VOLTage:PROTection[:LEVel]?

Syntax: Short Form: [SOUR:]VOLT:PROT[:LEV] MIN, MAX

Long Form: [SOURce:]VOLTage:PROTection[:LEVel] MIN, MAX Return Value: <exp_value> = digits with decimal point and Exponent, e.g., 2.71E+1 for 27.1

Description: Identifies overvoltage protection setting, maximum allowable overvoltage protection, or mini-

mum overvoltage protection. VOLT:PROT? returns value set by VOLT:PROT. VOLT:PROT? MAX returns maximum voltage protection value (see Table 1-2 ); this value is determined at the factory and cannot be changed by the user. VOLT:PROT? MIN returns the minimum voltage protection value (always 0). (See example, Figure B-6.)

NOTES: 1. The power supply is assumed to be operating in constant voltage (CV) mode.

2 Examples below are intended only to illustrate command functions. Refer to PAR. 3.3.5 for pro-

gramming techniques to optimize performance

VOLT 21; CURR 1.1 Power supply programmed to 21V, 1.1A. VOLT 2.157E1 Power supply programmed to go to 21.57V. VOLT? Returns 2.157E1, indicating programmed voltage = 2.157V. VOLT? MAX For ABC 135-1DM, returns 135 (135V). VOLT? MIN Returns 0 (minimum allowable voltage). VOLT:PROT 2.365+E1 Voltage protection set to 23.65V. VOLT? Returns 21.57, indicating programmed voltage value = 21.57V. VOLT:PROT? Returns 2.365+E1, (programmed overvoltage protection = 23.65V VOLT:PROT?MAX For ABC 10-10DM, returns 11. VOLT:PROT:TRIP? 0 indicating overvoltage protection not tripped.

--- OVERVOLTAGE CONDITION OCCURS. VOLT:PROT:TRIP? 1 indicating overvoltage protection tripped. VOLT:PROT:CLE Overvoltage condition cleared. VOLT:PROT:TRIP? 0 indicating overvoltage condition not tripped. VOLT? Returns 0, programmed voltage value = 0V. VOLT 21; CURR 1.1 Power supply programmed to go to 21V, 1.1A. VOLT? Returns 21. VOLT:LIM:HIGH 5 Voltage limit set to 5V. VOLT:LIM:HIGH? Returns 5 . VOLT 33 Power supply programmed to 5V., error message -301 posted. VOLT? Returns 5.

QUERY

VOLT:PROT?

FIGURE B-6. PROGRAMMING VOLTAGE

B.66 [SOURce:]VOLTage:PROTection:CLEar COMMAND

Syntax: Short Form: [SOUR:]VOLT:PROT:CLE Long Form: [SOURce:]VOLTage:PROTection:CLEar

Description: Clears overvoltage condition. Output programmed to 0V; current limit programmed to small value

(approximately 1% of full scale current rating). Overvoltage Protection Tripped is reset so that VOLT:PROT:TRIP? returns 0. Related Commands: VOLT:PROT, VOLT:PROT:TRIP?. (See example, Figure B-6.)

B.67 [SOURce:]VOLTage:PROTection:TRIPped? QUERY

Syntax: Short Form: [SOUR:]VOLT:PROT:TRIP? Long Form: [SOURce:]VOLTage:PROTection:TRIPped?

Return Value: 0 or 1

Description: Identifies whether overvoltage condition was detected. Returns 0 if overvoltage protection tripped;

1 if overvoltage protection not tripped. Related Commands: VOLT:PROT, VOLT:PROT:CLE. (See example, Figure B-6.)

Description: Returns value representing voltage limit set by VOLT:LIM:HIGH command. Related Commands:

VOLT:LIM:HIGH, VOLT. (See example, Figure B-6.)

ABC 012703

VOLT:PROT:CLE

VOLT:PROT:TRIP?

B-15

B.68 [SOURce:]FUNCtion:MODE? QUERY

Syntax: Short Form: FUNC:MODE? Long Form: [SOURce:]FUNCtion:MODE?

Return Value: VOLT or CURR

Description: Identifies the operating mode of the power supply. VOLT = Constant Voltage mode (CV).

CURR = Constant Current mode (CC). (See example, Figure B-1.)

FUNC:MODE?

B.69 STATus:OPERation:CONDition QUERY

Syntax: Short Form: STAT:OPER:COND? Long Form: STATus:OPERation:CONDition?

Return Value: <int_value> 0 to 1313 (1 + 32 + 256 + 1024).

Description: Returns the value of the Operation Condition Register (see Table B-2). The Operation Condition

Register contains unlatched real-time information about the operating conditions of the power supply. Bit set to 1 = function enabled (active, true); bit reset to 0 = function disabled (inactive, false). (See example, Figure B-7.)

STAT:OPER:COND?

TABLE B-2. OPERATION CONDITION REGISTER, OPERATION ENABLE REGISTER,

AND OPERATION EVENT REGISTER BITS

CONDITION NU CC NU CV NU WTG NU CAL

BIT 15-11 10 9 8 7 - 6 5 4 - 1 0

VAL UE

32,768 -

2048

1024 512 256 128 - 64 32 16 -2 1

B.70 STATus:OPEReration:ENABle COMMAND

Syntax: Short Form: STAT:OPER:ENAB <int_value> 0 to 1313 (1 + 32 + 256 + 1024)

Long Form: STATus:OPERation:ENABle <int_value> 0 to 1313 (1 + 32 + 256 + 1024)

Description: Sets Operation Enable Register. The Operation Enable Register is a mask for enabling specific bits

in the Operation Event Register which will cause the operation summary bit (bit 7) of the Status Byte register to be set Bit set to 1 = function enabled (active, true); bit reset to 0 = function disabled (inactive, false). The operation summary bit is the logical OR of all the enabled bits in the Operation Event register. (See example, Figure B-7.)

CAL - INTERFACE COMPUTING NEW CALIBRATION

CONSTANTS CC - POWER SUPPLY IN CONSTANT CURRENT MODE CV - POWER SUPPLY IN CONSTANT VOLTAGE MODE NU - NOT USED WTG WAIT FOR TRIGGER (SET BY INIT SUBSYSTEM)

STAT:OPER:ENAB

B.71 STATus:OPEReration:ENABle? QUERY

Syntax: Short Form: STAT:OPER:ENAB? Long Form: STATus:OPERation:ENABle?

Return Value: <int_value> 0 to 1313 (1 + 32 + 256 + 1024).

Description: Reads Operation Enable Register (see Table B-2). Returns value of Operation Enable Register bits.

Bit set to 1 = function enabled (active, true); bit reset to 0 = function disabled (inactive, false). (See example, Figure B-7.)

B.72 STATus:OPERation[:EVENt] QUERY

Syntax: Short Form: STAT:OPER[:EVEN]? Long Form: STATus:OPERation[:EVENt]?

Return Value: <int_value> 0 to 1313 (1 + 32 + 256 + 1024).

Description: Indicates changes in conditions monitored by Operational Event Register. Returns the value of

the Operation Event register. The Operation Event register is a read-only register which holds (latches) all events that occur. Reading the Operation Event register clears it. . (See example, Figure B-7.)

B-16

STAT:OPER:ENAB?

STAT:OPER?

ABC 012703

B.73 STATus:PRESet COMMAND

Syntax: Short Form: STAT:PRES Long Form: STATus:PRESet

Description: Disables reporting of all status events. This command sets all bits of the Operation Condition

(Table B-2) and Questionable Condition Registers to 0, preventing all status events from being reported. (See example, Figure B-7.)

NOTE:The power supply is assumed to be operating in cV (constant voltage) mode.

STAT:OPER:ENAB 1056Mask enabled for CC, WTG and bits. STAT:OPER:ENAB? Returns 1056 (32 + 1024) (CC, WTG bits set). STAT:QUES:ENAB 3 Mask enabled for OV and OC bits (1 + 2). STAT:QUES:ENAB? Returns 3 (1 + 2) indicating OV and OC bits are enabled. STAT:PRES Operation Condition and Questionable Condition registers are

reset. INIT:CONT ON Continuous triggers enabled. STAT:OPER:COND? Power supply returns 288 (256 + 32) to indicate that power

supply is constant voltage mode and Wait For Trigger is true. STAT:OPER? Returns 1057, e.g., indicating that since the last reading of the

Operation Event Register the power supply has entered

Constant Current mode, the Wait Trigger was set. STAT:OPER? Returns 0 indicating no changes since previous reading of the

Operation Event register. STAT:QUES? Returns 0 (no questionable conditions occurred since previous

reading

--- OVERCURRENT CONDITION OCCURS

STAT:QUES? Returns 2 (overcurrent protection tripped since the last

STAT:QUES? query). STAT:QUES:COND? Returns 2, (Power supply still in overcurrent protection state). STAT:QUES? Returns 0, (Register cleared by previous STAT:QUES?). STAT:QUES:COND? Returns 2, (Power supply still in overcurrent protection state). CURR:PROT:CLE Overcurrent condition cleared. STAT:QUES:COND? Returns 0, (register cleared by CURR:PROT:CLE). SYST:ERR? Power supply returns 0,“No error” message.

STAT:PRES

FIGURE B-7. USING STATUS COMMANDS AND QUERIES

B.74 STATus:QUEStionable[:EVENt]? QUERY

Syntax: Short Form: STAT:QUES[EVEN]? Long Form: STATus:QUEStionable[EVENT]?

Return Value: <int_value> actual register value

Description: Indicates questionable events that occurred since previous STAT:QUES? query. Returns the

value of the Questionable Event register (see Table B-3). The Questionable Event register is a read-only register which holds (latches) all events. Reading the Questionable Event register clears it. (See example, Figure B-7.)

STAT:QUES?

TABLE B-3. QUESTIONABLE EVENT REGISTER, QUESTIONABLE CONDITION REGISTER

AND QUESTIONABLE CONDITION ENABLE REGISTER BITS

CONDITION NU OC OV

BIT 15 - 2 1 0

VALUE 32,768 - 4 2 1

ABC 012703

OC - OVERCURRENT PROTECTION TRIPPED OV - OVERVOLTAGE PROTECTION TRIPPED NU - NOT USED

B-17

B.75 STATus:QUEStionable:CONDition? QUERY

Syntax: Short Form: STAT:QUES:COND? Long Form: STATus:QUEStionable:CONDition?

Return Value: <int_value> actual register value

Description: Returns the value of the Questionable Condition Register (see Table B-3). The Questionable

Condition Register contains unlatched real-time information about questionable conditions of the power supply. Bit set to 1 = condition (active, true); bit reset to 0 = condition (inactive, false). (See example, Figure B-7.)

STAT:QUES:COND?

B.76 STATus::QUEStionable:ENABle COMMAND

Syntax: Short Form: STAT:QUES:ENAB <int_value> Long Form: STATus:QUESionable:ENABle <int_value>

Function: Programs Questionable Condition Enable Register.

Description: Programs Questionable Condition Enable Register (see Table B-3).The Questionable Condition

Enable Register determines which conditions are allowed to set the Questionable Condition Register; it is a mask for enabling able summary bit (bit 3) of the Status Byte register to be set. The questionable summary bit is the logical OR of all the enabled bits in the Questionable Event register. Bit set to 1 = function enabled (active, true); bit reset to 0 = function disabled (inactive, false)

B.77 STATus:QUEStionable:ENABle? QUERY

Syntax: Short Form: STAT:QUES:ENAB? Long Form: STATus:QUESionable:ENABle?

Return Value: <int_value> actual register value

Description: Reads Questionable Condition Enable Register (see Table B-3). Power supply returns value of

Questionable Condition Enable Register, indicating which conditions are being monitored. Bit set to 1 = function enabled (active, true); bit reset to 0 = function disabled (inactive, false). Related Commands: STAT:QUES?. (See example, Figure B-7.)

B.78 SYSTem:ERRor[:NEXT]? QUERY

Syntax: Short Form: SYST:ERR[:NEXT]? Long Form: SYSTem:ERRor[:NEXT]?

Return Value: <int_value,string>

Description: Posts error messages to the output queue. Returns the next error number followed by its corre-

sponding error message string from the instrument error queue. The error queue is a FIFO (first in first out) buffer that stores errors as they occur. As it is read, each error is removed from the queue and the next error message is made available. When all errors have been read, the query returns 0,"No error". If more than 15 errors are accumulated, it will overflow. The oldest errors stay in the queue but the most recent errors are discarded. The last error in the queue will be -350,"Too many errors." Error messages are defined in Table B-4.

specific bits in the Questionable Event register that can cause the question-

STAT:QUES:ENAB

(See example, Figure B-7.)

STAT:QUES:ENAB?

SYST:ERR?

B.79 SYSTem:ERRor:CODE? QUERY

Syntax: Short Form: SYST:ERR:CODE?] Long Form: SYSTem:ERRor:CODE?

Description: Returns the three character error code without the ASCII definition string. The error codes are defined

in table B-4 (See example, Figure B-1.) The error bits defined in PAR A.3 through A.5 are related to these error codes produced during parsing of messages and also to errors in the power supply as indicated in Table B-4.

B.80 SYSTem:ERRor:CODE:ALL? QUERY

Syntax: Short Form: SYST:ERR:CODE:ALL?] Long Form: SYSTem:ERRor:CODE:ALL?

Return Value:

Description: Returns a comma-separated list of all error codes. A maximum of 15 codes will be returned; if the

queue is empty, the power supply returns 0.

B-18

SYST:ERR:CODE:ALL?

SYST:ERR:CODE?

ABC 012703

TABLE B-4. ERROR MESSAGES

ERROR MESSAGE

0,“No error ” None No error

ESR ERROR BIT SET

(SEE PAR. A.5)

EXPLANATION

-100,“Command error”

-102,”Syntax error”

-103,”Invalid separator”

Command Error bit 5

Command and data understood, but more information included which is not recognized.

First 4 characters recognized, subsequent characters not recognized.

For example, VOLT.PROT received instead of VOLT:PROT

-108,”Parameter Not Allowed Error” Command Error bit 5 Volt12 sequence, channel number is invalid

-109,”Missing parameter” Command Error bit 5 For example, VOLT instead of VOLT 21.

-111,”Header seperator error” Command Error bit 5 Missing space between volt and value or ; missing

-113,”Undefined header”

Command Error bit 5

First 4 characters could not be identified as legal command.For example, command VLT instead of VOLT

-120,”Numeric data error”

Command Error bit 5

Expected number but other characters were detected

-121,”Invalid character in number” Command Error bit 5 Volt 1,500 ( comma not allowed)

-123,”Exponent too large” Command Error bit 5 Exponent E+3 or greater is invalid.

-141,”Invalid character data”

-150,”String data error”

Command Error bit 5

For example OUTP OFD or OUTP STOP instead of OUTP OFF

Invalid characters were detected in numeric entry.For example E.1 instead of E+1 or 4d3 instead of 4.3.

-203,”Command protected” Execution error bit 4 Command only valid in password Cenable state

-221,”Settings conflict” Execution error bit 4 Invalid password from syst:pass:cen command

-222,“Data out of range” Execution error bit 4 Value exceeds power supply rating

-223,”Data format error” Execution error bit 4 Multiple decimalls in digit, Multiple E, etc.

-224,“Illegal parameter value” Execution error bit 4 For example, OUTP 2 instead of OUTP 1

-241,”Hardware missing” Execution error bit 4 Requesting device 2 status (INST:NSEL 2)

-282,”Illegal program name” Execution error bit 4 Executing prog:run without LIST:SEQ command

-301,”Value bigger than limit” Device Error bit 3 Requesting a time of 301 which is bigger than limit

-311,”Memory error” Device Error bit 3 Power-up NV RAM error

-314,”Save/recall memory error” Device Error bit 3 Using cell other than 1 - 41 for SAV and RCL

-341,”Non Volatile Mem. CRC error”

Device Error bit 3

Power supply constants may be corrupted; recalibration may be necessary.

-350,Queue overflow Query Error bit 2 More than 15 errors are in queue.

-410,”Query interrupted

Query Error bit 2

New command sent before data from previous query read. Previous query data lost.

-430,Query Deadlocked Query Error bit 2 Over 255 characters received in single input string"

ABC 012703

B-19

B.81 SYSTem:KLOCk COMMAND

Syntax: Short Form: SYST:KLOC <boolean> Long Form: SYSTem:KLOCk <boolean>

<boolean> (0 or OFF, 1 or ON)

Description: Locks (ON or 1) or unlocks (OFF or 0) the keypad. With the keypad unlocked the power supply

enters Remote mode as soon as a command or query is received. Once in Remote mode (with keypad unlocked) the front panel keys are disabled with the exception of the LOCAL key, which is used to return to Local mode.

After sending a SYST:KLOC ON (keypad lock) command, all front panel keys, including LOCAL, are disabled. The power supply is now in the “local lockout” state and the LCD changes from

. Local lockout can also be entered by sending the GPIB <LLO> code (hex 11) to the power sup-

Rwl

ply. The power supply remains in “local lockout” until a SYST:KLOC OFF command is received. Related Commands: SYST:KLOCK?. (See example, Figure B-8.)

SYST:KLOC

Loc

B.82 SYSTem:KLOCk? QUERY

Syntax: Short Form: SYST:KLOC? Long Form: SYSTem:KLOCk?

Return Value: <int_value> 0 or 1

Description: Identifies whether keypad is locked or unlocked. 0 = keypad unlocked, local operation possible by

pressing LOCAL key. 1 = keypad locked, LOCAL key disabled, only remote operation possible. Related Commands: SYST:KLOCK. (See example, Figure B-8.)

B.83 SYSTem:LANGuage? QUERY

Syntax: Short Form: SYST:LANG? Long Form: SYSTem:LANGuage?

Return Value: <string> SCPI or COMP

Description: Identifies whether unit responds to older command formats. SCPI means the unit will not respond

to older formats such as LIST:TIME. COMP means the unit will respond to older formats such as LIST:TIME for compatible operation with software written for ABC power supplies up to Revision 1.

B.84 SYSTem:LANGuage COMMAND

Syntax: Short Form: SYST:LANG {COMP | SCPI} Long Form: SYSTem:LANGuage {COMP | SCPI}

Description:Determines whether unit responds to older command formats. Sending SYST:LANG COMP causes the unit to respond to older formats such as LIST:TIME for compatible operation with software written for ABC power supplies up to Revision 1. SYST:LANG COMP has been selected at the factory to permit the VISA demonstration program (which uses older command formats) to operate. SYST:LANG SCPI disables responses to older command formats.

B.85 SYSTem:PASSword:CENable COMMAND

Syntax: Short Form: SYST:PASS:CEN <val> Long Form: SYSTem:PASSword:CENable <val>

SYST:PASS:CEN

SYST:KLOC?

SYST:LANG?

SYST:LANG

Description: Sets the password enable state if the value matches the current password. This command allows

other commands such as *SAV 41 to operate.

B.86 SYSTem:PASSword:CDISable COMMAND

Syntax: Short Form: SYST:PASS:CDIS <val> Long Form: SYSTem:PASSword:CDISable <val>

Description: Clears the password enable state if the value matches the current password.

B.87 SYSTem:PASSword:STATe? QUERY

Syntax: Short Form: SYST:PASS:STAT? Long Form: SYSTem:PASSword:STATe?

Return Value: <int_value> 0 or 1

Description: Returns a 1 if the password state is enabled or a 0 if it is disabled.

B-20

SYST:PASS:CDIS

SYST:PASS:STAT?

ABC 012703

B.88 SYSTem:SECurity:IMMediate COMMAND

Syntax: Short Form: SYST:SEC:IMM Long Form: SYSTem:SECurity:IMMediate

Description: Initializes all NVRAM variable to factory defaults. This includes all memory steps to be set to 0 volts,

1.28% of full scale current, overvoltage and overcurrent to be set to Iomax+10%, time value to be set to 0, and next step equal to 0.).It also initializes the power -up state to have DC Output Control off (see PAR 3.3.2). The calibration password is reset per Table 4-1 Use master password (see below) If password has been lost. Related Commands: SYST:PASS:CEN must be sent prior to this command

SYST:SEC:IMM

TABLE B-5. MASTER PASSWORDS

MODEL PASSWORD MODEL PASSWORD MODEL PASSWORD

ABC 10-10

ABC 15-7

..10

..60

B.89 SYSTem:SET COMMAND

Syntax: Short Form: SYST:SET {CM0 | CM1 | DC0 | DC1 | LF0 | LF1 | STR | RLX)

Long Form: SYSTem:SET {CM0 | CM1 | DC0 | DC1 | LF0 | LF1 | STR | RLX)

Description: Sending SYST:SET CM1 sets the unit to operate in compatible mode and have all GPIB functions

compatible with software version 1.2 and lower units. Sending SYST:SET CM0 sets the unit to be fully SCPI 1997 compliant.

Sending SYST:SET DC1 causes Device Clear to be identical to *RST command. Sending SYST:SET DC0 causes Device Clear to have no effect on output voltage, output current or output on/off state.

Sending SYST:SET LF1 causes the power supply to respond with line feed if read occurs with output buffer empty. Sending LF0 causes the power not to send a line feed if read occurs with output buffer empty (SCPI 1997 compliant).

Sending SYST:SET RLX allows the power supply to accept special debug and troubleshooting commands (for KEPCO use only - e.g., after sending SYST:SET RLX the power supply will respond to the $vda? command by returning the value of the internal D/A converter for voltage). Sending SYST:SET STR disables the special debug and troubleshooting commands.

Related Commands:

SYST:PASS:CEN - the password must be enabled prior to saving the SYST:SET configuration using the *SAV41 command.. *SAV41 - this command saves the confiiguration established by SYST:SET and OUTP commands and restores it upon power up.

ABC 25-4

ABC 36-3

..20

..30

ABC 60-2

ABC 125-1

..40

..50

SYST:SET

B.90 SYSTem:VERSion QUERY

Syntax: Short Form: SYST:VERS? Long Form: SYSTem:VERSion?

Return Value: <int_value>.<int_value> (YYYY.V)

Description: Identifies SCPI Version implemented. Returns SCPI Version number:

YYYY = year, V = Revision number for specified year. (See example, Figure B-8.)

SYST:VERS Returns 1997.0. SYST:KLOC ON keypad locked, only remote control possible. SYST:KLOC? Returns 1 indicating keypad locked. SYST:KLOC OFF keypad unlocked, pressing LOCAL key allows Local mode

operation.

SYST:KLOC? Returns 0 indicating keypad unlocked.

FIGURE B-8. USING SYTEM COMMANDS AND QUERIES

ABC 012703

SYST:VERS?

B-21/(B-22 Blank)

Kepco ABC-DM User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SECTION 1 - INTRODUCTION

SECTION 2 - INSTALLATION

SECTION 3 - OPERATION

SECTION 4 - CALIBRATION

APPENDIX A - IEEE 488.2 COMMAND/QUERY DEFINITIONS

APPENDIX B - SCPI COMMAND/QUERY DEFINITIONS

FIGURE 1-1. ABC SERIES POWER SUPPLY

1.1 SCOPE OF MANUAL

1.2 GENERAL DESCRIPTION

SECTION 1 - INTRODUCTION

1.3 SPECIFICATIONS

TABLE 1-2. MAXIMUM OVERVOLTAGE AND OVERCURRENT SETTINGS

TABLE 1-1. MODEL PARAMETERS

TABLE 1-3. ABC SPECIFICATIONS

FIGURE 1-2. ABC SERIES POWER SUPPLY, MECHANICAL OUTLINE DRAWING

FIGURE 1-3. ABC POWER SUPPLY AND RA 71 RACK ADAPTER, OUTLINE DRAWING

FIGURE 1-4. TWO ABC POWER SUPPLIES AND RA 72 RACK ADAPTER, OUTLINE DRAWING

1.4 LOCAL CONTROL

1.5 REMOTE CONTROL

1.6 FEATURES

1.6.1 DIGITAL CALIBRATION

1.6.2 OVERVOLTAGE/OVERCURRENT PROTECTION

1.6.3 PROGRAMMABLE OVERVOLTAGE/OVERCURRENT DELAY

1.6.4 NON-VOLATILE STORAGE OF PROGRAMMED SEQUENCES OR ACTIVE SETTINGS

1.6.5 USER-DEFINED VOLTAGE/CURRENT LIMITS

1.7 EQUIPMENT SUPPLIED

1.8 ACCESSORIES

TABLE 1-4. ACCESSORIES

1.9 SAFETY

TABLE 1-5. SAFETY SYMBOLS

1.10 RIPPLE/NOISE MEASUREMENT

FIGURE 1-5. RIPPLE AND SPIKE MEASUREMENT CABLES

SECTION 2 - INSTALLATION

2.1 UNPACKING AND INSPECTION

2.2 TERMINATIONS AND CONTROLS

FIGURE 2-1. ABC SERIES FRONT PANEL

FIGURE 2-2. ABC SERIES REAR PANEL

2.3 SOURCE POWER REQUIREMENTS

2.4 COOLING

2.5 PRELIMINARY OPERATIONAL CHECK

FIGURE 2-3. LCD POWER ON DEFAULTS

2.6 INSTALLATION

2.7 WIRING INSTRUCTIONS

2.7.1 SAFETY GROUNDING

2.7.2 SOURCE POWER CONNECTIONS

2.7.3 D-C OUTPUT GROUNDING

2.7.4 POWER SUPPLY/LOAD INTERFACE

2.7.5 LOAD CONNECTION - GENERAL

2.7.6 LOAD CONNECTION USING LOCAL SENSING

FIGURE 2-4. GROUNDED LOAD CONNECTIONS, LOCAL SENSING

FIGURE 2-5. ISOLATED LOAD CONNECTIONS, LOCAL SENSING

2.7.7 LOAD CONNECTION USING REMOTE SENSING

FIGURE 2-6. GROUNDED LOAD CONNECTIONS, REMOTE SENSING

FIGURE 2-7. ISOLATED LOAD CONNECTIONS, REMOTE SENSING

2.8 OPERATING CONFIGURATION

SECTION 3 - OPERATION

3.1 GENERAL

3.2 LOCAL MODE OPERATION

3.2.1.1 COMMAND ENTRY STATUS

3.2.1.2 DATA ENTRY STATUS

3.2.1.3 DISPLAY (LCD)

3.2.1.4 KEYPAD FUNCTIONS

3.2.2 TURNING THE POWER SUPPLY ON

3.2.3 SETTING LOCAL MODE

FIGURE 3-1. LCD POWER ON DEFAULTS

3.2.4 ADJUSTING LCD CONTRAST

3.2.5 ENABLING/DISABLING AUDIBLE BEEPS

3.2.6 ENABLING/DISABLING DC OUTPUT POWER

3.2.6.1 POWER UP DIGITAL DC OUTPUT CONTROL

3.2.7 RESET

3.2.8 SETTING OUTPUT VOLTAGE OR CURRENT

3.2.9 SETTING OVERVOLTAGE OR OVERCURRENT PROTECTION

3.2.10 CHANGING PROTECTION DELAY

3.2.11 CHANGING MAXIMUM VOLTAGE OR CURRENT VALUE

3.2.12 STORING POWER SUPPLY OUTPUT SETTINGS

3.2.13 RECALLING STORED OUTPUT SETTINGS