KEPCO ABC-DM SERIES User Manual
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.
©2004, KEPCO, INC
P/N 243-0888
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 until LCD reads
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 until LCD display
. Use ENTER to accept numbers entered or execute a command.
SPEAKER
and entering 0.)
. Operations are done from the keypad
CONTRAST
,
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 " and # 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 “
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 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
Output is OFF
’”
ABCCOND040104 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 " or # 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: Set from1 to 30
• Set RS 232 Baud Rate: Set to 19200, 9600, 4800 or 2400.
• Loop Back Test: Aids isolating RS 232 problems
• DCL Control: Allows DCL (Device Clear) to either set output to 0V or have no effect on output voltage
• Power up output on/off: Allows the output to be either on or off when unit is first turned on.
• 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 or factory 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.
B ABCSVC040104
Declaration of Conformity
Application of Council directives:
Standard to which Conformity is declared:
EN61010-1: 2001
EN61326-1:1997
Manufacturer's Name and Address:
Importer's Name and Address:
Type of Equi pme nt:
73/23/EEC (LVD)
89/336/EEC(EMC)
93/68/EEC (CE mark)
(Safety requirements for electrical equipment for
measurement, control and laboratory use - Part 1)
(Electrical equipment for measurement, control and
laboratory use - EMC requirements)
KEPCO INC.
131-38 SANFORD AVENUE
FLUSHING, N.Y. 11352 USA
Y
P
O
C
E
V
I
T
A
T
N
E
S
E
R
P
E
R
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, comp lies with the requi rements o f the Low V olt age Dire ctive 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:
(ABC SERIES MODEL NUMBER]
Saul Kupferberg
(Full Name)
VP OF SALES
(position)
228-1346 DC-ABC 052704
A/(B 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
1.6.6 External Trigger/Remote On-Off Port ................................................................................................ 1-8
1.7 Equipment Supplied ................................................................................................................................ 1-8
1.8 Accessories ............................................................................................................................................. 1-8
1.9 Safety ...................................................................................................................................................... 1-9
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 .................................................................................................................. 2-3
2.4 Cooling .................................................................................................................................................... 2-3
2.5 Preliminary Operational Check................................................................................................................ 2-3
2.6 Installation ............................................................................................................................................... 2-4
2.7 Wiring Instructions................................................................................................................................... 2-4
2.7.1 Safety Grounding............................................................................................................................... 2-4
2.7.2 Source Power Connections............................................................................................................... 2-5
2.7.3 D-C Output Grounding....................................................................................................................... 2-5
2.7.4 Power Supply/Load Interface............................................................................................................. 2-5
2.7.5 Load Connection - General................................................................................................................ 2-6
2.7.6 Load Connection Using Local Sensing.............................................................................................. 2-7
2.7.7 Load Connection Using Remote Sensing.......................................................................................... 2-8
2.8 Operating Configuration .......................................................................................................................... 2-8
SECTION 3 - OPERATION
3.1 General.................................................................................................................................................... 3-1
3.2 Remote On/Off ........................................................................................................................................ 3-1
3.3 Local Mode Operation ............................................................................................................................. 3-1
3.3.1 Front Panel Keypad and LCD............................................................................................................ 3-1
3.3.1.1 Command Entry Status................................................................................................................ 3-1
3.3.1.2 Data Entry Status......................................................................................................................... 3-1
3.3.1.3 Display (LCD)............................................................................................................................... 3-2
3.3.1.4 Keypad Functions........................................................................................................................ 3-2
3.3.2 Turning the Power Supply On............................................................................................................ 3-4
3.3.3 Setting Local Mode............................................................................................................................ 3-5
3.3.4 Adjusting LCD Contrast..................................................................................................................... 3-5
3.3.5 Enabling/Disabling Audible Beeps..................................................................................................... 3-5
3.3.6 Enabling/Disabling DC Output Power................................................................................................ 3-5
3.3.6.1 Power Up Digital DC Output Control............................................................................................ 3-5
3.3.7 Reset ................................................................................................................................................. 3-5
3.3.8 Setting Output Voltage or Current ..................................................................................................... 3-6
3.3.8.1 Programming Techniques to Optimize Power Supply performance ............................................ 3-6
3.3.9 Setting Overvoltage or Overcurrent Protection.................................................................................. 3-7
3.3.10 Changing Protection Delay ................................................................................................................ 3-7
3.3.11 Changing Maximum Voltage or Current Value .................................................................................. 3-7
ABC 040104
i
TABLE OF CONTENTS
SECTION PAGE
3.3.12 Storing Power Supply Output Settings.............................................................................................. 3-8
3.3.13 Recalling Stored Output Settings...................................................................................................... 3-8
3.3.14 Local Mode Programming of the Power Supply................................................................................ 3-8
3.3.14.1 Creating or Modifying a Program (Program Edit Mode).............................................................. 3-8
3.3.14.1.1 Modifying Programmed Time Interval..................................................................................... 3-9
3.3.14.2 Running a Program..................................................................................................................... 3-9
3.3.14.3 Stepping Through a Program...................................................................................................... 3-9
3.3.14.4 Cycling a Program....................................................................................................................... 3-9
3.3.14.5 Running a Program Once ........................................................................................................... 3-9
3.3.14.6 Stopping a Program .................................................................................................................... 3-11
3.3.14.7 Stopping a Running Program...................................................................................................... 3-11
3.3.14.8 Sample Program ......................................................................................................................... 3-11
3.3.15 Calibration......................................................................................................................................... 3-11
3.4 Remote Mode Programming................................................................................................................... 3-11
3.4.1 DCL Control ...................................................................................................................................... 3-12
3.5 IEEE 488 (GPIB) Bus Operation............................................................................................................. 3-12
3.5.1 IEEE 488 (GPIB) Bus Protocol ......................................................................................................... 3-12
3.5.2 Changing the GPIB Address............................................................................................................. 3-12
3.5.3 ABC VISA Instrument driver ............................................................................................................. 3-14
3.6 RS232-C Operation ................................................................................................................................ 3-14
3.6.1 Setting RS 232 Baud Rate................................................................................................................ 3-15
3.6.2 Serial Interface.................................................................................................................................. 3-15
3.6.3 RS 232 Implementation .................................................................................................................... 3-15
3.6.3.1 Echo Mode.................................................................................................................................. 3-16
3.6.3.2 Prompt Method............................................................................................................................ 3-16
3.6.3.3 XON XOFF Method..................................................................................................................... 3-17
3.6.4 Isolating RS 232 Communication Problems ..................................................................................... 3-17
3.7 SCPI Programming................................................................................................................................. 3-17
3.7.1 SCPI Messages ................................................................................................................................ 3-18
3.7.2 Common Commands/Queries .......................................................................................................... 3-18
3.7.3 SCPI Subsystem Command/Query Structure................................................................................... 3-18
3.7.3.1 ABORt Subsystem ...................................................................................................................... 3-18
3.7.3.2 DISPlay Subsystem .................................................................................................................... 3-18
3.7.3.3 INITiate Subsystem..................................................................................................................... 3-18
3.7.3.4 LIST Subsystem.......................................................................................................................... 3-18
3.7.3.5 MEASure Subsystem.................................................................................................................. 3-18
3.7.3.6 OUTPut Subsystem .................................................................................................................... 3-19
3.7.3.7 Protection Subsystem ................................................................................................................. 3-19
3.7.3.8 STATus Subsystem .................................................................................................................... 3-19
3.7.3.9 TRIGger subsystem .................................................................................................................... 3-19
3.7.3.10 [SOURce:]VOLTage and [SOURce:]CURRent Subsystems ...................................................... 3-19
3.7.3.11 CALibrate Subsystem ................................................................................................................. 3-19
3.7.3.12 Instrument Subsystem ................................................................................................................ 3-19
3.7.3.13 System Subsystem ..................................................................................................................... 3-20
3.7.4 Program Message Structure ............................................................................................................. 3-20
3.7.4.1 Keyword ...................................................................................................................................... 3-20
3.7.4.2 Keyword Separator ..................................................................................................................... 3-22
3.7.4.3 Query Indicator............................................................................................................................ 3-22
3.7.4.4 Data............................................................................................................................................. 3-23
3.7.4.5 Data Separator............................................................................................................................ 3-23
3.7.4.6 Message Unit Separator ............................................................................................................. 3-23
3.7.4.7 Root Specifier.............................................................................................................................. 3-23
3.7.4.8 Message Terminator ................................................................................................................... 3-23
3.7.5 Understanding The Command Structure .......................................................................................... 3-23
3.7.6 Program Message Syntax Summary ................................................................................................ 3-24
3.7.7 SCPI Program Examples.................................................................................................................. 3-25
3.8 Operator Maintenance............................................................................................................................ 3-25
ii
ABC 040104
TABLE OF CONTENTS
SECTION PAGE
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
4.5 Restoring Previous Calibration Values.................................................................................................... 4-4
4.6 Restoring Factory Calibration Values...................................................................................................... 4-4
4.7 Setting Factory Calibration Values .......................................................................................................... 4-4
4.8 Calibration Storage.................................................................................................................................. 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-2
B.3 CALibrate:CURRent:LEVel Command ................................................................................................... B-3
B.4 CALibrate:CURRent[:DATA] Command................................................................................................. B-3
B.5 CALibrate:PASSword Command ........................................................................................................... B-4
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-6
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
ABC 040104
iii
TABLE OF CONTENTS
SECTION PAGE
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
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-10
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-16
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-17
B.73 STATus:PRESet Command ................................................................................................................... B-17
B.74 STATus:QUEStionable[:EVENt]? Query ................................................................................................ B-18
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:COMMunication:GPIB:ADDRess Command........................................................................... B-18
B.79 SYSTem:COMMunication:GPIB:ADDRess? Query ............................................................................... B-19
B.80 SYSTem:COMMunication:SERial:BAUDrate Command........................................................................ B-19
B.81 SYSTem:COMMunication:SERial:BAUD? Query................................................................................... B-19
iv
ABC 040104
TABLE OF CONTENTS
SECTION PAGE
B.82 SYSTem:COMMunication:SERial:ECHO Command ............................................................................. B-19
B.83 SYSTem:COMMunication:SERial:ECHO? Query .................................................................................. B-19
B.84 SYSTem:COMMunication:SERial:PACE Command.............................................................................. B-19
B.85 SYSTem:COMMunication:SERial:PACE? Query................................................................................... B-19
B.86 SYSTem:COMMunication:SERial:PROMpt Command.......................................................................... B-19
B.87 SYSTem:COMMunication:SERial:PROMpt? Query............................................................................... B-20
B.88 SYSTem:ERRor[:NEXT]? Query............................................................................................................ B-20
B.89 SYSTem:ERRor:CODE? Query............................................................................................................. B-20
B.90 SYSTem:ERRor:CODE:ALL? Query...................................................................................................... B-20
B.91 SYSTem:KLOCk Command................................................................................................................... B-20
B.92 SYSTem:KLOCk? Query........................................................................................................................ B-20
B.93 SYSTem:LANGuage? Query ................................................................................................................. B-22
B.94 SYSTem:LANGuage COMMAND .......................................................................................................... B-22
B.95 SYSTem:PASSword:CENable Command.............................................................................................. B-22
B.96 SYSTem:PASSword:CDISable Command............................................................................................. B-22
B.97 SYSTem:PASSword:STATe? Query...................................................................................................... B-22
B.98 SYSTem:SECurity:IMMediate Command............................................................................................... B-22
B.99 SYSTem:SET Command ....................................................................................................................... B-23
B.100 SYSTem:VERSion Query....................................................................................................................... B-23
B.101 TRIGger:SOURce Command................................................................................................................. B-23
ABC 040104
v
LIST OF FIGURES
FIGURE TITLE PAGE
1-1 ABC Series Power Supply........................................................................................................................... viii
1-1 ABC Series Power Supply, Mechanical Outline Drawing........................................................................... 1-4
1-2 ABC Power Supply and RA 71 Rack Adapter, Outline Drawing ................................................................ 1-5
1-3 Two ABC Power SUpplies and RA 72 Rack Adapter, Outline Drawing ..................................................... 1-6
1-4 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............................................................................................................................. 2-4
2-4 Grounded Load Connections, Local Sensing............................................................................................. 2-7
2-5 Isolated Load Connections, Local Sensing ................................................................................................ 2-7
2-6 Grounded Load Connections, Remote Sensing......................................................................................... 2-8
2-7 Isolated Load Connections, Remote Sensing ............................................................................................ 2-8
3-1 LCD Power On Defaults............................................................................................................................. 3-4
3-2 RS 232 Implementation.............................................................................................................................. 3-16
3-3 Tree Diagram of SCPI Commands Used with ABC Power Supply ............................................................ 3-21
3-4 Message Structure ..................................................................................................................................... 3-22
3-5 Typical Example Of ABC Power Supply Program Using SCPI Commands............................................... 3-25
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 System Commands and Queries ..................................................................................................... B-23
vi
ABC 040104
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 ...........................................................................................................................................1-9
2-1 Input/Output Pin Assignments for IEEE 488 (GPIB) Port ...........................................................................2-2
2-2 Trigger Port Pin Assignments .....................................................................................................................2-2
2-3 RS232C PORT Input/Output Pin Assignments ...........................................................................................2-3
3-1 Key Functions .............................................................................................................................................3-2
3-2 Memory Location Worksheet ......................................................................................................................3-10
3-3 Sample Program (Model ABC 10-10DM) ....................................................................................................3-11
3-4 IEEE 488 (GPIB) Bus Interface Functions ..................................................................................................3-13
3-5 IEEE 488 (GPIB) Bus Command Mode Messages .....................................................................................3-13
3-6 IEEE 488 (GPIB) Bus Data Mode Messages ..............................................................................................3-14
3-7 Rules Governing Shortform Keywords ........................................................................................................3-22
4-1 Factory Default Calibration Passwords .......................................................................................................4-3
4-2 Calibration Storage .....................................................................................................................................4-5
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-18
B-4 Error Messages .......................................................................................................................................... B-21
B-5 Master Passwords ..................................................................................................................................... B-22
ABC 04104
vii
FIGURE 1-1. ABC SERIES POWER SUPPLY
viii
ABC 040104
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 1-2 and 1-3). 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 either the IEEE 488.2 GPIB
communication bus or RS 232 serial bus) using SCPI commands.
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.
TABLE 1-1. MODEL PARAMETERS
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
2x SOURCE
FREQUENCY
SWITCHING
FREQUENCY
SPIKE (50MHz)
TABLE 1-2. MAXIMUM OVERVOLTAGE AND OVERCURRENT SETTINGS
MODEL NUMBER
MAXIMUM OVERVOLTAGE SETTING 11V 17 27 39 65 137
ABC
10-10DM
ABC
15-7DM
ABC
25-4DM
ABC
36-3DM
ABC
60-2DM
100% LOAD
85-264V a-c
ABC
125-1DM
MAXIMUM OVERCURRENT SETTING 11 7.7 4.4 3.3 2.2 1.1
ABCOPR040104
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
O
max
O
O
max
O
O
max
O
O
max
O
max
max
max
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
ABCOPR040104
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
O
max
O
max ABC 25-4DM
O
ABC 10-10DM
ABC 15-7DM
ABC 36-3DM
0.025% I
max
O
ABC 60-2DM
ABC 125-1DM
O
max
O
max
O
max
50-100% load change
return to 1% E
O
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
O
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 1-1.
For rack mounting see
Figures 1-2 and 1-3.
Unpacked
3 wire fused
±Output, ±Sense, Ground
Rear,
SCPI & IEEE 488.2 Commands
2 x 16 character alphanumeric
LCD with LED backlight
ABCOPR040104
1-3
FIGURE 1-1. ABC SERIES POWER SUPPLY, MECHANICAL OUTLINE DRAWING
1-4
ABCOPR040104
FIGURE 1-2. ABC POWER SUPPLY AND RA 71 RACK ADAPTER, OUTLINE DRAWING
ABCOPR040104
1-5
FIGURE 1-3. TWO ABC POWER SUPPLIES AND RA 72 RACK ADAPTER, OUTLINE DRAWING
1-6
ABCOPR040104
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 either the IEEE 488.2 (GPIB)
bus or RS 232 serial 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. 3.3.9.
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. 3.3.10.
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. 3.3.12.
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.
ABCOPR040104
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. 3.3.11.
1.6.6 EXTERNAL TRIGGER/REMOTE ON-OFF PORT
The external trigger/Remote on off port provides two functions: One pin allows the unit to be
triggered to return to previously stored settings using SCPI commands (see PAR. B.101).
Another pin allows the output to be set to zero Volts, zero Amperes from a remote location using
a single dedicated line (see PAR. 3.2).
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 Adapter Accepts a two ABC power supplies for side by sided installation in a 19-
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 long) Connects ABC power supply to GPIB bus SNC 488-4
Fuse Circuit Protection (Replacement of Fuse A2FS1 is authorized by ser-
External Trigger mating connector (9mm 3-pin earphone
jack)
RS 232 Cable Kit Contains RJ 45 Patch cord, two RS 232 adapters, one with male pins to
rack (see Figure 1-2).
inch wide rack (see Figure 1-3).
vice personnel only.)
Allows access to remote trigger and remote output on/off functions 142-0486
connect to DTE equipment and one with female pins to connect to a PC
(personal computer,.and an RS 232 Loop Back test Connected to test
RS 232 communication and aid in isolating RS 232 communication
problems.
PART NUMBER
RA 71
RA 72
IEC TYPE T,
3.15A, 250V a-c
(Power Dynamics
MDP-023)
KIT 219-0436
1-8
ABCOPR040104
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.
CAUTION: REFER TO REFERENCED PROCEDURE.
!
WARNING
CAUTION
INDICATES THE POSSIBILITY OF BODILY INJURY
OR DEATH.
INDICATES THE POSSIBILITY OF EQUIPMENT
DAMAGE.
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, specialized test cables are required (not supplied). Figure 1-4
illustrates the requirements for two cables, one for ripple measurement and one for spike measurement.
ABCOPR040104
FIGURE 1-4. 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 040104
FIGURE 2-1. ABC SERIES FRONT PANEL
FIGURE 2-2. ABC SERIES REAR PANEL
2-1
TABLE 2-1. INPUT/OUTPUT PIN ASSIGNMENTS FOR IEEE 488 (GPIB) PORT
CONNECTOR PIN SIGNAL NAME FUNCTION
I/O Line
I/O Line
I/O Line
I/O Line
I/O Line
I/O Line
I/O Line
I/O Line
IEEE 488
PORT
(connector A1J1)
1
2
3
4
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
13
14
15
16
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
I
01
D
I
D
02
I
03
D
I
04
D
D
I
05
I
D
06
I
D
07
I
D
08
TABLE 2-2. TRIGGER PORT PIN ASSIGNMENTS
CONNECTOR PIN SIGNAL NAME FUNCTION
TRIGGER Logic 0 triggers ABC to previously stored setting (see
PAR. B.101.).
EXT_OFF Logic 0 causes ABC output to go to 0 Volts, 0 Amps
(the same as pressing the OUTPUT ON/OFF key).
TRIGGER PORT
(connector A1J2)
1
2
3 Trigger- Shutdown RTN Return for TRIGGER and SHUTDOWN signals.
2-2
ABC 040104
TABLE 2-3. RS232C PORT INPUT/OUTPUT PIN ASSIGNMENTS
CONNECTOR PIN SIGNAL NAME FUNCTION
1 RTN Return 1 Signal Ground
2 Not Used Not Used 2 Receive Data
3 TXD Transmit Data 3 Transmit Data
RXD Receive Data
4
RS 232
PORT
(connector A1J5)
5 RTN Return 5 Signal Ground
Not Used Not Used
6
RTN Return
7
8 RTN Return 8 Clear To Send (protocol not used)
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
Adapter Cable (P/N KIT 219-0436)
PIN FUNCTION
Data Terminal Ready (protocol not
4
used)
Data Set Ready (protocol not
6
used)
Request To Send (protocol not
7
used)
9 Signal Ground
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.
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 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.
ABC 040104
2-3
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 1-2 and 1-3.
2.7 WIRING INSTRUCTIONS
Interconnections between an a-c power source and a power supply, and between the power
supply and its load are as critical as the interface between other types of electronic equipment.
If optimum performance is expected, certain rules for the interconnection of source, power supply and load must be observed by the user. These rules are described in detail in the following
paragraphs.
2.7.1 SAFETY GROUNDING
Local, national and international safety rules dictate the grounding of the metal cover and case
of any instrument connected to the a-c power source, when such grounding is an intrinsic part of
the safety aspect of the instrument. The ground terminal of the source power connector (Figure
2-2) 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.
"
and # 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. 3.3.11.
2-4
ABC 040104
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.
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
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
ABC 040104
2-5
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