Agilent Technologies 6626A, 6625A, 6628A, 6629A User Manual
OPERATING MANUAL
MULTIPLE OUTPUT LINEAR SYSTEM
DC POWER SUPPLY
AGILENT MODELS 6625A, 6626A,
6628A, and 6629A
Agilent Part No 06626-90001
Microfiche Part No. 06626-90002 Printed in Malaysia
September, 2004
CERTIFICATION
Agilent Technologies certifies that this product met its published specifications at time of shipment from the factory. Agilent
Technologies further certifies that its calibration measurements are traceable to the United States National Bureau of
Standards, to the extent allowed by the Bureau's calibration facility, and to the calibration facilities of other International
Standards Organization members.
WARRANTY
This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period of one
year from date of delivery. Agilent software and firmware products, which are designated by Agilent for use with a
hardware product and when properly installed on that hardware product, are warranted not to fail to execute their
programming instructions due to defects in material and workmanship for a period of 90 days from date of delivery. During
the warranty period Agilent Technologies will, at its option, either repair or replace products which prove to be defective.
Agilent does not warrant that the operation of the software, firmware, or hardware shall be uninterrupted or error free.
For warranty service, with the exception of warranty options, this product must be returned to a service facility designated
by Agilent. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned to Agilen t
for warranty service. Except for products returned to Customer from another country, Agilent shall pay for return of
products to Customer.
Warranty services outside the country of initial purchase are included in Agilent's product price, only if Customer pays
Agilent international prices (defined as destination local currency price, or U.S. or Geneva Export price).
If Agilent is unable, within a reasonable time to repair or replace any product to condition as warranted, the Customer shall
be entitled to a refund of the purchase price upon return of the product to Agilent.
LIMITATION OF WARRANTY
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer,
Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental
specifications for the product, or improper site preparation and maintenance. NO OTHER WARRANTY IS EXPRESSED
OR IMPLIED. Agilent SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE.
EXCLUSIVE REMEDIES
THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER'S SOLE AND EXCLUSIVE REMEDIES. Agilent
SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL
DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.
ASSISTANCE
The above statements apply only to the standard product warranty. Warranty options, extended support contracts, product
maintenance agreements and customer assistance agreements are also available. Contact your nearest Agilent
Technologies Sales and Service office for further information on Agilent's full line of Support Programs.
Copyright 2000, 2004 Agilent Technologies Edition 1___January, 1993
Update 1___February, 2000
Update 2___September, 2004
2
SAFETY SUMMARY
The following general safety precautions must be observed during all phases of operation, service, and repair of this
instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety
standards of design, manufacture, and intended use of the instrument. Agilent Technologies assumes no liability for the
customer’s failure to comply with these requirements.
BEFORE APPLYING POWER.
Verify that the product is set to match the available line voltage and the correct fuse is installed.
GROUND THE INSTRUMENT.
This product is a Safety Class 1 inst rument (provided with a protective earth terminal). To minimize shock hazard, th e instrument chassis
and cabinet must be connected to an electrical ground. The instrument must be connected to the ac power supply mains through a threeconductor power cable, with the third wire firmly connected to an electrical ground (safety ground) at the power outlet. For instruments
designed to be hard-wired to th e ac power lines (supply mains), conn ect the protective earth terminal to a protect ive conductor before any
other connection is made. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will
cause a potential shock h azard that could result in personal inju ry. If the instrument is to be energized via an external autotransformer for
voltage reduction, be certain that the autotransfo r mer common terminal is connect ed to the neutral (earthed pole) of the ac power lines
(supply mains).
FUSES.
Only fuses with the required rated current, voltage, and specified type (normal blow, time delay, etc.) should be used. Do not use repaired
fuses or short circuited fuseholders. To do so could cause a shock or fire hazard.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.
Do not operate the instrument in the presence of flammable gases or fumes.
KEEP AWAY FROM LIVE CIRCUITS.
Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified
service personnel. Do not replace components with power cable connected. Under certain conditions, dangerous voltages may exist even
with the power cable removed. To avoid injuries, always disconnect power, discharge circuits and remove external voltage sources before
touching components.
DO NOT SERVICE OR ADJUST ALONE.
Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.
DO NOT EXCEED INPUT RATINGS.
This instrument may be equipped with a line filter to reduce electromagnetic interference and must be connected to a properly grounded
receptacle to minimize electric shock hazard. Operation at line voltages or frequencies in excess of those stated on the data plate may
cause leakage currents in excess of 5.0 mA peak.
SAFETY SYMBOLS.
Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the
instruction manual (refer to Table of Contents) .
Indicates hazardous vo ltages.
Indicate earth (ground) terminal.
The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly
performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the
indicated conditions are fully understood and met.
The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or th e like, which, if not correctly
performed or adhered to, coul d result in damage to or destruction of part or all of the product. Do not proceed
beyond a CAUTION sign until the indicated conditions are fully understood and met.
DO NOT SUBSTITUTE PARTS OR MODIFY INSTRUMENT.
Because of the danger of introducing additional hazards, do not install substitute parts or perform any unau t horized modification to the
instrument. Return the instrument to an Agilent Technologies Sales and Service Office for service and repair to ensure that safety features
are maintained.
Instruments which appear damaged or defective should be made inoperative and secured against unintended operation until they can be
repaired by qualified service personnel
3
SAFETY SUMMARY (continued)
GENERAL
Any LEDs used in this product are Class 1 LEDs as per IEC 825-1.
This ISM device complies with Canadian ICES-001. Cet appareil ISM est conforme à la norme NMB-001 du Canada.
ENVIRONMENTAL CONDITIONS
This instrument is intended for indoor use in an installation category II, pollution degree 2 environment. It is designed to
operate at a maximum relative humidity of 95% and at altitudes of up to 2000 meters. Refer to the specifications tables for the
ac mains voltage requirements and ambient operatin g temperature range.
SAFETY SYMBOL DEFINITIONS
Symbol Description Symbol Description
Direct current Terminal for Line conductor on permanently
installed equipment
Alternating current Caution, risk of electric shock
Both direct and alternating current Caution, hot surface
Three-phase alternating current Caution (refer to accompanying documents)
Earth (ground) terminal In position of a bi-stable push control
Protective earth (ground) terminal Out position of a bi-stable push control
Frame or chassis terminal On (supply)
Terminal for Neutral conductor on
permanently installed equipment
Terminal is at earth potential
(Used for measurement and control
circuits designed to be operated with
one terminal at earth potential.)
Herstellerbescheinigung
Diese Information steht im Zusammenhang mit den Anforderungen der
Maschinenläminformationsverordnung vom 18 Januar 1991.
* Schalldruckpegel Lp <70 dB(A) * Am Arbeitsplatz * Normaler Betrieb
* Nach EN 27779 (Typprüfung).
Manufacturer’s Declaration
This statement is provided to comply with the requirements of the German Sound Emission Directive,
from 18 January 1991.
* Sound Pressure Lp <70 dB(A) * At Operator Position * Normal Operation
* According to EN 27779 (Type Test).
Off (supply)
Standby (supply)
Units with this symbol are not completely
disconnected from ac mains when t his switch is
off. To completely disconnect the unit from ac
mains, either disconnect the power cord or have
a qualified electrician install an external switch.
4
DECLARATION OF CONFORMITY
According to ISO/IEC Guide 22 and CEN/CENELEC EN 45014
Manufacturer’s Name and Address
Responsible Party
Agilent Technologies, Inc. Agilent Technologies (Malaysia) Sdn. Bhd
550 Clark Drive, Suite 101
Budd Lake, New Jersey 07828
USA
Declares under sole responsibility that the product as originally delivered
Product Names a) Multiple Output 40 W and 80 W system dc Power Supplies
Model Numbers a) 6621A, 6622A, 6623A; 6624A, 6627A
Product Options This declaration covers all options and customized products based on the above
Complies with the essential requirements of the Low Voltage Directive 73/23/EEC and the EMC
Directive 89/336/EEC (including 93/68/EEC) and carries the CE Marking accordingly.
EMC Information ISM Group 1 Class A Emissions
As detailed in Electromagnetic Compatibility (EMC), Certificate of Conformance Number
Assessed by: Celestica Ltd, Appointed Competent Body
Safety Information and Conforms to the following safety standards.
This DoC applies to the above-listed products placed on the EU market after:
Alternate Manufacturing Site
Malaysia Manufacturing
Bayan Lepas Free Industrial Zone, PH III
11900 Penang,
Malaysia
b) Multiple Output 25 W and 50 W precision system dc Power Supplies
b) 6625A; 6626A; 6628A; 6629A
(and other customized products based upon the above)
products.
CC/TCF/00/076 based on Technical Construction File (TCF) HPNJ3, dated
Oct. 29, 1997
Westfields House, West Avenue
Kidsgrove, Stoke-on-Trent
Straffordshire, ST7 1TL
United Kingdom
IEC 61010-1:2001 / EN 61010-1:2001
UL 1244
CSA C22.2 No. 1010.1:1992
January 1, 2004
Date Bill Darcy/ Regulations Manager
For further information, please contact your local Agilent Technologies sales office, agent or distributor.
Authorized EU-representative: Agilent Technologies Deutschland GmbH, Herrenberger Straβe 130, D
71034 Böblingen, Germany
Revision: B.00.00 Issue Date: Created on 11/24/2003 3:33
PM
Document No. 662xA.11.24.doc
5
WHAT THIS MANUAL CONTAINS
It contains information relating to the installation, operation, and programming of these supplies as outlined below.
Maintenance and troubleshooting instructions are given in a separate Service Manual (Agilent Part No. 06626-90003).
Chapter 1.--General Information
Chapter 1 contains a general description of the power supplies as well as instrument specifications and information
concerning options and accessories.
Chapter 2.--Installation Procedures
Chapter 2 contains information to prepare the supply for use. Included in this chapter are power requirements, line voltage
conversion, and GP-IB interface connections.
Chapter 3.--Getting Started
Chapter 3 contains a brief description of the supply’s front panel controls and indicators and describes how to turn on the
supply and to check it’s operation. An introd uction to remote operation over the GP-IB is also given to help a first time user
get started quickly.
Chapter 4.--Output Connections and Opera ting Information
Chapter 4 contains information about making connections to the supply’s output terminals. General operating information is
also provided.
Chapter 5.--Remote Operation
Chapter 5 contains all of the information required to op erate the supply remotely via a GP-IB computer. All of the
commands that can be used to program the supplies are described.
Chapter 6.--Local Operation
Chapter 6 contains instructions on using all of the front panel controls and indicators.
Appendix A--Calibration Procedure
Appendix A contains programming steps and procedures that are required to calibrate your power supply. It is
recommended that the power supply be calibrated yearly.
Appendix B--Programming with Series 200/300 Computer
Appendix B contains Series 200/300 Computer programming examples (in Agilent extended BASIC language) for your
Power Supply’s most fr e quently used functions.
Appendix C--Command Summary
Appendix C contains an alphabetical listing of all commands that can be sent to a supply.
Appendix D--Error Messages
Appendix D contains a listing and brief explanation of all error codes and messages for all programming and hardware
errors.
Appendix E - Manua l Backdating
Appendix E contains backdating in formation for units with Serial numbers lower than those listed on the title page.
6
1 General Information
Introduction...................................................................................................................................................11
Safety Considerations....................................................................................................................................11
Instrument and Manual Identification...........................................................................................................11
Options..........................................................................................................................................................11
Accessories....................................................................................................................................................12
Description ...................................................................................................................................................12
Basic Operation.............................................................................................................................................14
GP-IB Board..............................................................................................................................................14
Output Boards............................................................................................................................................15
Specifications................................................................................................................................................15
Qualifying Conditions...............................................................................................................................15
Definitions.................................................................................................................................................15
2 Installation
Introduction...................................................................................................................................................25
Initial Inspection............................................................................................................................................25
Location and Cooling....................................................................................................................................25
Input Power Requirements............................................................................................................................26
Line Fuse.......................................................................................................................................................27
Power Cord....................................................................................................................................................28
Line Voltage Conversion...............................................................................................................................29
GP-IB Interface Connection.............. ............................................................................................................29
Table Of Contents
3 Getting Started
Introduction ..................................................................................................................................................31
Front Panel Controls and Indicators..............................................................................................................31
Turning On Your Supply...............................................................................................................................36
Normal Self Test Indications.....................................................................................................................36
Self Test Errors..........................................................................................................................................37
Checking Out Your Supply Using Local Control..........................................................................................37
Voltage Test..............................................................................................................................................38
Overvoltage Test.......................................................................................................................................38
Current Test...............................................................................................................................................38
Changing Resolution Range......................................................................................................................39
Introduction To Remote Operation....... ........................................................................................................39
Enter/Output Statements............................................................................................................................40
Reading the GP-IB Address......................................................................................................................40
Changing the GP-IB Address....................................................................................................................40
Sending a Remote Command....................................................................................................................41
Getting Data from the Supply....................................................................................................................41
Often Used Commands..............................................................................................................................41
Returning the Supply to Local Mode........................................................................................................43
4 Output Connections and Operating Information
Introduction ..................................................................................................................................................45
Output Ranges...............................................................................................................................................45
Operating Quadrants..................................................................................................................................46
Operating Range........................................................................................................................................47
Protection Features........................................................................................................................................48
Connecting The Load....................................................................................................................................49
Wire Size Selection...................................................................................................................................49
Multiple Loads.............................. ............................................................................................................50
7
Positive and Negative Voltages.................................................................................................................51
Remote Voltage Sensing............................................................................................................................... 51
Remote Sense Connections.......................................................................................................................52
Output Noise Considerations.....................................................................................................................53
Programming Response Time with an Output Capacitor..........................................................................53
Open Sense Leads......................................................................................................................................54
Overvoltage Trigger Connections.................................................................................................................54
External Trigger Circuit............................................................................................................................54
Power Supply Protection Considerations .......................... ...........................................................................55
Battery Charging........................... ............................................................................................................55
Capacitive Load Limitation.......................................................................................................................56
Parallel Operation..........................................................................................................................................56
CV Operation............................................................................................................................................57
CC Operation.............................................................................................................................................58
Remote Sensing.........................................................................................................................................58
Specifications for Parallel Operation.........................................................................................................58
Series Operation............................................................................................................................................59
CV Operation............................................................................................................................................59
CC Operation.............................................................................................................................................60
Remote Sensing.........................................................................................................................................60
Specifications for Series Operation...........................................................................................................60
Bi-Polar Operation....................................................................................................................................61
5 Remote Operation
Introduction ..................................................................................................................................................63
GP-IB Operation............................................................................................................................................63
Interface Functions....................................................................................................................................63
GP-IB Address Selection...........................................................................................................................64
Power-On Service Request (PON)............................................................................................................65
Programming Syntax.....................................................................................................................................65
Numeric Data............................................................................................................................................67
Order of Execution....................................................................................................................................70
Terminators................................ ...............................................................................................................70
Initial Conditions...........................................................................................................................................71
Power Supply Commands.......................................................................................................... ...................71
Voltage Programming...............................................................................................................................71
Current Programming................................................................................................................................73
Range Programming..................................................................................................................................73
Output On/Off.................................... .......................................................................................................74
Overvoltage Protection..............................................................................................................................74
Overcurrent Protection........................... ...................................................................................................75
Multiple Output Storage and Recall..........................................................................................................75
The Clear Command..................................................................................................................................76
Status Reporting........................................................................................................................................76
Service Request Generation....................... ...............................................................................................79
Reprogramming Delay............................. .................................................................................................80
Display On/Off.......................................................................................................................................... 81
Other Queries.............................................................................................................................................82
Table Of Contents (continued)
6 Local Operation
Introduction ..................................... .............................................................................................................85
Local Mode....................................................................................................................................................85
8
Table Of Contents (continued)
Local Control Of Output Functions............................................................................................................... 85
General........................................... ...........................................................................................................85
Setting Voltage and Voltage Range...........................................................................................................86
Setting Current and Current Range............................................................................................................87
Enabling/Disabling an Output...................................................................................................................87
Setting Overvoltage Protection..................................................................................................................88
Resetting Overvoltage Protection..............................................................................................................88
Enabling/Disabling Overcurrent Protection..............................................................................................88
Resetting Overcurrent Protection..............................................................................................................88
Local Control Of System Functions..............................................................................................................88
Setting the Supply’s GP-IB Address..........................................................................................................88
Displaying Error Messages........................................................................................................................89
Storing and Recalling Voltage and Current. Settings for all Outputs........................................................89
A Alignment Procedures
Introduction...................................... .............................................................................................................91
Test Equipment and Setup Required.............................................................................................................91
Calibration Program......................................................................................................................................91
Alignment Program.......................................................................................................................................95
B Programming With a Series 200/300 Computer
Introduction ................................................................................................................................................103
I/O Path Names...................... .....................................................................................................................103
Voltage and Current Programming.............................................................................................................103
Voltage and Current Programming With Variables... .................................................................................104
Voltage and Current Readback....................................................................................................................104
Programming Power Supply Registers........................................................................................................105
Present Status...................... ....................................................................................................................105
Service Request and Serial Poll...............................................................................................................106
Error Detection .................... ...................................................................................................................107
Stored Operating States...........................................................................................................................108
C Command Summary
Introduction.................................................................................................................................................109
D Error Messages
Introduction.................................................................................................................................................117
Power-On Self Test Messages.....................................................................................................................117
Error Responses...........................................................................................................................................117
Test Responses............................................................................................................................................117
E Manual Backdating
Introduction ................................................................................................................................................121
Make Changes.................…………………………………………………………………………………...121
Agilent Sales and Support Office
Contacts ......................................................................................................................................................122
9
1
General Information
Introduction
This chapter contains a general description of your power supply as well as its performance specifications. Information
about options, accessories, and GP-IB cables is also provided. This manual describes the Agilent 6625A, 6626A, 6628A,
and Agilent 6629A power supplies. Unless stated otherwise, the information in this manual applies to all of these models.
Information that is specific to one model only is identified as such in this manual.
Safety Considerations
This product is a Safety Class 1 instrument, which means that it is provided with a protective earth terminal. This terminal
must be connected to a power source that has a 3-wire ground receptacle. Review the instrument and this manual for safety
markings and instructions b e fore operation. Refer to the Safety Summary page at the beginning of this manua l for a
summary of general safety information. Safety information for specific procedures is located at appropriate places in this
manual.
Instrument and Manual Identification
Agilent Technologies power supplies are identified by a two-part serial number, i.e. 2601A-00101. The first part of the
serial number (the prefix) is a number/letter combination that denotes either the date of manufacture or the date of a
significant design change. It also indicates the country of origin. (Starting at 1960, 26 = 1986; 01 = the first week of the
year; A = U.S.A.) The second part of the serial number is a different sequential number assigned to each instrument starting
with 00101.
Options
Options 100,120, 220, and 240 simply determine which line voltage is selected at the factory. For information about
changing the li ne voltage setting, see line voltage conversion para graph on page 29.
Option 750 consists of a fault indicator (FLT) and remote inhibit (INH) circuit and relay control, which provide additional
shutdown protection should either the GP-IB and/or controller fail. This Option is described in a separate document
entitled, ’’Appendix E Option 750 Operating Instructions for the Multiple Output Linear System DC Power Supply, Agilent
Models 6621A, 6622A, 6623A, 6624A, and 6627A’’ (Agilent P/N 5957-6372).
#100 Input power, 100 Vac, 47-66 Hz
#120 Input power, 120 Vac, 47-66 Hz
#220 Input power, 220 Vac, 47-66 Hz
#240 Input power, 240 Vac, 47-66 Hz
#750 Fault (FLT) Remote Inhibit (INH) and Relay Control
#908 One rack mount kit (5062-3977)
#909 One rack mount kit with handles (5062-3983)
#0L2 One extra operating manual
#0B3 One service manual
General Information
11
Accessories
10833A GP-IB cable, 1 m (3.3 ft)
10833B GP-IB cable, 2 m (6.6 ft)
10833C GP-IB cable, 4 m (13.2 ft)
10833D GP-IB cable, 0.5 m (1.6 ft)
10834A GP-IB connector extender
Slide mount kit (1494-0059)
Description
The Agilent power supply features a combination of programming capabilities and linear power supply performance that
make them ideal for systems applications. The models in this family offer a total of up to 200 watts of output power, with
voltages up to 50 volts and currents up to 2 amps. The output combinations that correspond to each model are shown in
Table 1-1. Each isolated output has a high resolution and standard resolution range, as shown in Figure 1-1.
Table 1-1 Output Combinations Available
Model Output 1 Output 2 Output 3 Output 4
Agilent 6625A 25 W 50 W -- -Agilent 6626A 25 W 25 W 50 W 50 W
Agilent 6628A 50 W 50 W -- -Agilent 6629A 50 W 50 W 50 W 50W
Figure 1-1. Output Operating Range
Output 2 of the Agilent 6625A and outputs 3 and 4 of the Agilent 6626A and all outputs of the Agilent 6628A and Agilent
6629A have an "L’’ shaped characteristic. The L shaped characteristic allows you to use the same output to power loads
with different voltage and current requirements. The power supply automatically selects one of the operating ranges based
on the last parameter (voltage or current) that is set. If a high resolution o r a standard resolution application is required for
either voltage or current, VRSET and IRSET should be used (see Appendix C-Command Summary). Additionally, each
output contains an active downprogrammer, which means that voltage downprogramming can be accomplished as quickly
as upprogramming, even without a load.
12
General Information
The power supplies allow up to a 10 volt sense lead drop. This feature makes them ideal for test system applications where
remote sensing is used.
The output voltage and current for any output can be monitored with the front panel display. Output specific error messages
are also displayed. Front panel annunciators show the ope rating status of the instrument. The front pa nel keypad lets you set
and readback the voltage limit, current limit, and overvoltage trip level of any output. With the ke ypad, you can also enable
or disable outputs, enable overcurrent protection, reset overvoltage and overcurrent protection, and return to local operating
mode.
Your multiple output power supply can be b oth a listener and a talker on the GP-IB. (GP-IB is Agilent Technologies’
implementation of IEEE-488). The built-in interface is tailored to the supply, resulting in simpler programming. Voltage
and current settings can be sent directly to the specified output in volts and amps.
Service can be requested from your power supply for up to 10 reasons. The supply responds to a serial poll by identifying
the output on which the fault occurred. Self-contained measurement and readback capability eliminate the need for
externally scanning the outp uts using a separate DVM. Upon command, the supply will measure its output voltage or
current and return the value on the GP-IB. The following functions are implemented via the GP-IB:
Voltage and current programming.
Programmable resolution range.
Voltage and current measurement and readback.
Present and accumulated status readback.
Programmable service request mask.
Programmable overvoltage and overcurrent protection.
Voltage and current range programming.
Storage and recall of programmed voltage and current values for all outputs.
Queries of programmed functions or settings.
Output enable or disable.
Programming syntax erro r detection.
Programmable delay time for service request and OCP mask.
Voltage, current, and overvoltage calibration.
GP-IB interface selftest.
Message display capability on the fro nt pa nel.
Output connections are made to rear panel screw ter minals. Either the positive or negative output terminal can b e grounded,
or the output can be floated up to ± 240 Vdc (includi ng output voltage) from chassis gro und. Output voltage can be locally
or remotely sensed, and identical outputs can be operated in series or parallel combinations for increased output voltage or
current capability. As shipped from the factory, the power supply is jumpered for local sensing.
Your power supply can be calibrated without having to remove the cover or even having to remove it from your system
cabinet. This feature allows you to calibrate the supply at its normal operating temperature. The recommended calibration
interval is one year. Refer to Appendix A of thi s manual for complete calibration details. A calibration security jumper is
available inside the unit. Access is described in the service manual.
General Information
13
Basic Operation
Figure 1-2 is a block diagram that illustrates the major assemblies contained within the power supply. As shown in the
figure, each supply includes a power transformer, two or more output boards, a GP-IB board, and front panel (display and
control keys).
Figure 1-2. Block Diagram
The appropriate ac input voltage is applied to each output board where it is converted to a raw dc voltage which is
subsequently linearly regulated to become the dc output voltage. The magnitude of the output and the mode of operation are
determined by the load and the data received from the GP-IB computer or from the front panel.
Each power supply model contains one output board for each output that it provides.
GP-IB Board
The GP-IB board provides the interface between the user and the multiple outputs of the power supply. Each output board
is actually an output channel that can be individually selected and controlled over the GP-IB or from the supply’s front
panel. Circuits on the GP-IB board interpret commands from the GP-IB or from the front panel to control the selected
output.
The GP-IB board also processes measurement and status data received from the output boards. This data may be read back
over the GP-IB and/or displayed on the supply’s front panel.
The power supply has no potentiometers. Each output is individually calibrated over the GP-IB using calibration commands
(see Appendix A). Correction factors are calculated by the power supply during calibration and are stored in a non-volatile
memory which is located on the supply’s GP-IB board. The supply contains no batteries.
14
General Information
Output Boards
The output boards are linear dc power supplies. Each isolated output operating boundary curve is shown in Figure 1-1.
The ac input to each output board is rectified and applied to a regulator circuit. Each output board employs series regulation
techniques. A regulator element is connected in series with the load and operates in the linear region (between saturation
and cutoff) of the transistor characteristic curve. Regulation is achieved by varying the conduction of the series element in
response to a change in line voltage or circuit load.
The output board receives digital signals from the GP-IB board and converts them to analog signals which program the
output voltage, current, and o vervoltage values. The output may be programmed remotel y over the GP-IB using commands
(see Chapter 5) or locally from the supply’s front panel using the control keys (see Chapter 6).
The output board can be commanded to send measurement and status data back over the GP-IB and/or front panel. The data
is sent back via the supply’s GP-IB board. GP-IB readback capabilities include o utput voltage and current, present a nd
accumulated status, and all programmed settings. The front panel LCD display can indicate the output voltage and current,
the supply’s GP-IB address, error messages, and programmed values. Annunciators on the front panel indicate the operating
status of the selected output (output board).
Specifications
Table l-2 lists the performance specifications for the Agilent 662xA power supplies. Performance specifications describe
the instrument’s warranted performance. The service manual, Option 9l0, contains procedures for verifying the
performance specifications.
Table 1-3 lists the supplemental characteristics for the Agilent 662xA supplies. Supplemental characteristics are type-tested
or typical values, which are based on a product sample and, while representative, are not guaranteed.
Qualifying Conditions
All performance specifications apply over the full operating temperature range of the power supply (0 to 55°C) unless
otherwise specified. All regulation, accuracy, etc. specifications are plus or minus the values listed. All measurements are
made at the rear terminals of the supply with a resistive load and local sensing unless otherwise specified. Voltage
measurements are made from the + S to the - S terminals. Overvoltage measurements are made from the + V to the - V
terminals. + Current refers to the output acting as a current source while - Current refers to the output acting as a current
sink.
Definitions
Load effect
output in question.
Source effect: Maximum steady state change in the regulated output parameter due to a change in the source voltage
within rated values.
Cross regulation: Maximum steady state change in the regulated output parameter due to a change in load resistance on
any other output(s).
Programming accuracy: (Calibration temp ± 5°C) Maximum difference between the programmed value and the actual
output.
: Maximum steady state change in the regulated output parameter due to a change in load resistance on the
Readback accuracy: (Calibration temp ±5°C) Maximum error in reading back an output parameter. Expressed as a
percentage of the reading, plus a constant.
General Information
15
Output response time: Beginning at the time the power supply has finished processing a VSET command (change
output voltage), the maximum time for the output voltage to settle to within a settling band about the final value from any
specified operating point. This value must be added to the command processing time to obtain total programming time (see
Figure 1-3). Time constant is the maximum time required for the voltage to reach 63% of its final value.
Figure 1-3. Output Response Characteristics
Temperature coefficient: Maximum change in the regulated output parameter per °C change in ambient temperature
after a 30 minute warmup. Expressed as a percentage plus a constant per degrees C. (Plus a constant for readback
temperature coefficient).
Long Term Drift: Maximum change of regulated output voltage or current during an 8-hour period following a 30 minute
warmup, with all influence and control quantities maintained constant. Expr essed as a percentage of the setting plus a
constant.
Short Term Drift: Maximum change of regulated output voltage or current within 30 minutes after a line and/or load
change. Expressed as a percentage of the setting plus a constant.
Output Noise (PARD): PARD replaces the former term ripple and noise. PARD is the periodic and random deviation of
dc output voltage or current from its average value, over a specified bandwidth and with all influence and control quantities
maintained constant.
Programming resolution: Average programming step size.
Current Sinking (- Current): Each output can sink as well as source current. The sinking capabilit y is not programmable
and depends upon the output voltage. The current sinking cap ability is described in greater detail in
Chapter 4.
Table 1-2. Specifications
PERFORMANCE SPECIFIC ATIONS: (0 to 55 °C unless otherwise specified)
DC Output Ranges: All outputs will accept voltage programming commands 1% higher than those listed and
current programming commands 3% higher than those listed.
Output Power 25 Watt Output 50 Watt Output
Output Range Lo Range Hi Range Lo Range Hi Range
Output Volts 0-7 V 0-50 V 0-16 V 0-50 V
Output Amps 0-15 mA 0-500 mA 0-200 mA 0-2 A
Load Effect (Regulation):
Voltage 0.5 mV 0.5 mV 0.5 mV 0.5 mV
+ Current 0.005 mA 0.005 mA 0.01 mA 0.015 mA
16
General Information
Table 1-2. Specifications (continued)
Source Effect:
Voltage 0.5 mV 0.5 mV 0.5 mV 0.5 mV
+ Current 0.005 mA 0.005 mA 0.01 mA 0.01 mA
Programming Accuracy:
Note: The programming accuracy specifications may degrade slightly when the unit is subjected to an RF field equal
to or greater than 3 volts/meter.
Voltage 0.016% + 1.5 mV 0.016% + 10 mV 0.016% + 3 mV 0.016% + 10 mV
+ Current
OVP 0.13% + 475 mV 0.13% + 475 mV 0.13% + 475 mV 0.13% + 475 mV
Measurement/Readback Accuracy*
Voltage 0.016% + 2 mV 0.016% + 10 mV 0.016% + 3.5 mV 0.016% + 10 mV
±
Current 0.03% + 15 µA 0.03% + 130 µA 0.04% + 250 µA 0.04% + 550 µA
Load Transient Recovery Time :(all outputs)
75 µS maximum to recover to within 75 mV of nominal value following a load change from 0.1 A to 100% of the
maximum rated current
Maximum Output Noise: (PARD) (20 Hz-20 MHz)
0.04% + 15 µA 0.04% + 100 µA 0.04% + 185 µA 0.04% + 500 µA
CV pk-to-pk 3 mV 3 mV 3 mV 3 mV
CV rms 0.5 mV 0.5 mV 0.5 mV 0.5 mV
+CC rms 0.1 mA 0.1 mA 0.1 mA 0.1 mA
AC Input Voltage and Frequency:
Nominal Line l00, 120, 220, or 240 Vac
Amplitude +6% to -13% of nominal line voltage
Frequency 47 to 66 Hz
Note at low line, the supply will operate with up to 3/4 o hm line resistance
*For a ± 5 ° C range about the calibration temperature
Table 1-3. Supplemental Characteristics
Output Power 25 Watt Output 50 Watt Output
Output Range Lo Range Hi Range Lo Range Hi Range
Output Volts 0-7 V 0-50 V 0-16 V 0-50 V
Output Amps 0-15 mA 0-500 mA 0-200 mA 0-2 A
Temperature Coefficient-Programming:
Voltage (0.003%+0.1 mV)
per° C
+ Current
OVP (0.013% + 1 mV)
(0.0035% + 1.5 µA)
per° C
per° C
(0.003%+0.1 mV)
per° C
(0.0035% + 6 µA)
per° C
(0.013% + 2 mV)
per° C
(0.003%+0.1 mV)
per° C
(0.0035% + 30 µA)
per° C
(0.013% + 1 mV)
per° C
(0.003%+0.1 mV)
per° C
(0.0035% + 50 µA)
per° C
(0.013% + 2 mV)
per° C
General Information
17
Table 1-3. Supplemental Characteristics (continued)
Output Power 25 Watt Output 50 Watt Output
Output Range Lo Range Hi Range Lo Range Hi Range
Output Volts 0-7 V 0-50 V 0-16 V 0-50 V
Output Amps 0-15 mA 0-500 mA 0-200 mA 0-2 A
Temperature Coefficient-Measurement:
Voltage (0.002% + 0.1 mV)
per° C +0.5 mV
±
Current (0.0025% + 1.5 µA)
per° C + 1 µA
Long Term Drift: (In an 8 hour period following a 30 minute warm up)
Voltage 0.006% + 0.5 mV 0.006% + 2 mV 0.006% + 0.5 mV 0.006% + 2 mV
+ Current
Short Term Drift: (Within 30 minutes after a line and/or load change):
Voltage 0.002 + 0.5 mV 0.002 + 1 mV 0.002 + 0.5 mV 0.002 + 1 mV
+ Current
DC Floating Voltage:
No output terminal may be more that 240 Vdc from any other terminal or from chassis ground. Also, no overvoltage
terminal may be more than 240 Vdc from any other terminal or chassis ground.
Remote Sense Capability: (see pages 50 - 52):
Outputs can maintain specifications with up to 10 volt total in the remote sense lead s.
0.01% + 5 µA 0.01% + 20 µA 0.01% + 40 µA 0.01% + 60 µA
0.01% + 2 µA 0.01% + 20 µA 0.01% + 25 µA 0.01% + 60 µA
(0.002% + 0 .1 mV)
per° C +4 mV
(0.0025% + 10 µA)
per° C + 40 µA
(0.002% + 0 .1 mV)
per° C +1 mV
(0.0025% + 20 µA)
per° C + 15 µA
(0.002% + 0 .1 mV)
per° C +4 mV
(0.0025% + 50 µA)
per° C + 150 µA
AC Input Power
Programming Resolution:
Voltage
+ Current
OVP 230 mV 230 mV 230 mV 230 mV
Readback Resolution:
Voltage
+ Current
- Current
Fixed Overvoltage Protection: (Measured at output terminals +V and -V)
Minimum 56 V 56 V 56 V 56 V
Nominal 60 V 60 V 60 V 60 V
Maximum 64 V 64 V 64 V 64 V
18
General Information
: 550 Watts
460 µV
1 µA 33 µA 13 µA 131 µA
483 µV
1 µA 48 µA 14 µA 160 µA
1 µA 37 µA 14 µA 151 µA
3.2 mV 1 mV 3.2 mV
3.3 mV 1.1 mV 3.3 mV
Table 1-3. Supplemental Characteristics (continued)
High Line Inrush Current: 100 V Opt 120 V Opt 220 V Opt 240 V Opt
Peak Value 85 A 85 A 50 A 50 A
rms Value 6.3A 5.7 A 3.0 A 3.0 A
Fuse Rating 8 A 8 A 4 A 4 A
GP-IB Interface Capabilities:
SH1. AH1, T6, L4, SR1, RL1, PP1, DC1, DT0, C0, E1
Current Sink Capability:
25 Watt output: 0.50 A
50 Watt output: 1.0 A (2.0 A below 16 V)
Command Processing Time: (see Figure 1-3)
7 milliseconds typical (with front p a nel disabled). Using STD and RCL commands allows you to change all the
voltage and current settings in abo ut 1 0 mS (with front panel disabled).
Maximum Output Programming:
Response Time 6 mS 6 mS 6 mS 6 mS
Settling Band 50 mV 50 mV 50 mV 50 mV
Maximum Time
Constant
750 µS 750 µS 750 µS 750 µS
Series and Parallel operation:
Two outputs can be operated directly in parallel or can be connected for straight series operation. Refer to Chapter 4
for more information.
Reactive Load Capability:
All outputs have been designed with the ability to operate with significant reactive loads without instability (refer to
Figures 1-4 through 1-6)
Safety Agency Compliance:
This series of power supplies is designed to comply with the following standards:
IEC 348, UL 1244, and CSA 22.2 No. 231.
Dimensions (all models):
Height 132.6mm (5.22 in)
Width 425.5mm (16.75 in.)
Depth 497.8mm (19.6 in.)
General Information
19
Table 1-3. Supplemental Characteristics (continued)
Weight:
Agilent 6625A, 6628A Agilent 6626A, 6629A
Net 15.5 kg (34 lbs.) 17.7 kg (39 lbs.)
Shipping 20.8 kg (46 lbs.) 23 kg (51 lbs.)
Load Cross Regulation:
Voltage 0.25 mV 0.25 mV 0.25 mV 0.25 mV
+ Current 0.005 mA 0.005 mA 0.01 mA 0.01 mA
20
General Information
Figure 1-4. CV Operation with Capacitive Load, Stability Graph for all Outputs
General Information
21
Figure 1-5. Output Noise (Typical) CC Mode
22
General Information
Figure 1-6. Output Noise (Typical) CV Mode
Figure 1-7. Output Impedance (Typical) Graph (See Supplemental Characteristics)
General Information
23
2
Installation
Introduction
This chapter contains instructions for checking and mounting your power supply, connecting your supply to ac power,
converting it from one line voltage to another, and connecting the GP-IB cable.
The power supply generates operating magnetic fields which may affect the operation of other instruments. If your
instrument is susceptible to magnetic fields, do not locate it in the immediate vicinity of the power supply. Typically, at
three inches from the power supply, the electromagnetic field is less than 5 gauss.
Initial Inspection
Your instrument was thoroughly inspected and tested before it left the factory. As soon as you receive it, remove the power
supply from its packing case and check to make sure it has not been damaged in shipment. Check that there are no broken
connectors or keys, and that the cabinet and panel surfaces are free from dents and scratches. Check the rear panel terminal
blocks and front panel display for any cracks. If damage is found, you should file a claim with the carrier immediately and
notify the Agilent Technologies Sales and Service office nearest you.
Chapter 3 of this manual includes an electrical turn-on check-out procedure which, when carried out successfully, will give
you a high level of confidence that the power supply is operating in accordance with its specifications. Detailed electrical
checks complete with verification procedures are included in the Service Manual.
Keep the original packing materials for the carrier’s inspection if there was damage, or in case any equipment has to be
returned to Agilent Technologie s. Warranty information is printed on the inside cover of this manual. Remember to send a
detailed description of the failure and symptoms when returning the power supply for service. Your Agilent Technologies
Sales and Service office will furnish the address of the neares t service office to which the instrument can be shipped.
Location and Cooling
Your power supply can operate without loss of performance within the temperature range of 0 to 55 ° C (measured at the
fan intake). The fan, located at the rear of the unit, cools the supply by drawing air in through the openings on the rear panel
and exhausting it through openings on the sides. Using Agilent Technologies rack mount kits will not impede the flow of
air.
Because the power supply is fan cooled, it must be installed in a location that allows sufficient space at the rear and the
sides for adequate circulation of air. Either side may be restricted to have as little as 1 inch (25 mm) space.
Figure 2-1 gives the dimensions of the power supply cabinet. These dimensions apply to both models. The cabinet has
plastic feet that are shaped to ensure self-alignment when stacked with other Agilent Technologies System II cabinets. The
feet may be removed for rack mounting.
The power supply can be mounted in a standard 19 inch rack panel or enclosure. Rack mounting accessories for this unit
are listed under options (page 11) o f Chapter 1. Complete installation instruction s are included with each rack mounting kit.
Instrument support rails are required for non-stationary installations. These are normally supplied with the cabinet and are
not included with the rack mounting kits.
Installation
25
Figure 2-1. Outline Diagram
Input Power Requirements
You can operate this power supply from a nominal 100 V, 120 V, 220 V or 240 V single phase power source at 47 to 66
Hz. The input voltage range, maximum input current, high line inrush current (PK), and the fuse required for each of the
nominal inputs are listed in Table 2-1. You can check the line voltage setting of your supply by examining the door on the
line module. This is located on the rear panel of your supply as shown in Figure 2-2. The red mark that appears in one of
the four windows on the line module indicates the line voltage setting for which your supply is set.
If necessary, you can convert the supply from one line voltage setting to another by following the instructions under LINE
VOLTAGE CONVERSION (see page 29).
Table 2-1. Input Power
Nominal
Voltage
100 V 6.3 A 85 A 8 AM
120 V Nominal 5.7 A 85 A 8 AM
220 V -13%, +6% 3.0 A 50 A 4 AM
240 V 3.0 A 50 A 4 AM
Line Voltage Range Maximum Input Current
(rms.)
High Line Inrush
Current (PK)
Fuse
Line Fuse
The ac line fuse is located behind the door on the line module (see Figure 2-3). To access the fuse, remove the power cord
and push against the tab on the line module in the direction of the ac input socket. The current rating of the fuse is based on
the line voltage setting of your supply. Table 2-2 gives the Agilent part numbers for the fuses that should be used with
specific line voltages.
Installation26
Figure 2-2. Rear Panel Detail (Agilent 6626A Shown)
Table 2-2 Line Fuses
Line
Voltage
100/120 V 8AM 2110-0342
220/240 V 4AM 2110-0055
Note: All fuses are rated for 250 V.
Fuse
Needed
Agilent Part Number (for ¼ X 1¼ in. fuses
only)
Figure 2-3. Line Module Detail
Installation
27
Power Cord
The power supply is shipped from the factory with a power cord that has a plug appropriate for your location. Figure 2-4
shows the standard configuration of plugs used by Agilent Technologies. Below each drawing is the Agilent part number
for the replacement power cord equipped with a plug of that configuration. If a different power cord is required, contact the
nearest Agilent Technologies Sales and Service office.
For your protection, the National Electrical Manufacturer’s Association (NEMA) recommends that the instrument panel and
cabinet be grounded. This power suppl y is equippe d with a three-conductor power cord; the third conductor b e ing the
ground. The power supply is grounded only when the power cord is plugged into an appropriate receptacle. Do not operate
this power supply without adequate cabinet ground connection.
Figure 2-4. Power Cord Plug Configurations
SHOCK HAZARD. Connect the power cord to a grounded receptacle before you connect any
external floating voltages to the supply.
The offset pin on the standard three-prong power cord connector is the ground connection. If a two contact receptacle is
encountered, it must be replaced with a properly grounded three-contact receptacle in accordance with the National
Electrical Code, local codes and ordinances. The work should be done by a qualified electrician.
Line Voltage Conversion
You can change the supply to accept 100 V, 120 V, 220 V and 240 V ac input by adjusting the voltage selector card located
inside of the line module (see Figure 2-3). After you have changed the line voltage, refer to Table 2-2 and check that the
fuse inside the line module is the correct fuse for that line voltage. The procedure is as follows:
1. Turn off power and remove the power cord from the ac input socket on the back of the power supply.
2. To open the line module, move the plastic door on the module aside. If your line voltage change requires a change in the
rating of the fuse, rotate FUSE PULL to the left and re move the fuse.
3. Grasp the voltage select pc board with a pair of needle-nose pliers and slide it out of its slot.
4. To select a voltage, orient the pc board so that the desired voltage appears on the top left side of the board. Push the
board all the way back into its slot. The desired line vo ltage must be visible when the board is installed.
5. Install the correct fuse in the door of the line module if your line voltage change also requires a change in the rating of
the fuse (see Table 2-2).
Installation28
FIRE HAZARD. Make sure the replacement fuse is one of the same type (size) and rating (amps) that
is consistent with the voltage level you are operating at. Do not use a sub stitute fuse; use a fuse with
the same Agilent Part number listed in Table 2-2.
6. Close the door of the line module and insert the power cord in the ac input socket. Your power supply is now configured
to operate at the voltage you selected.
GP-IB Interface Connector
The GP-IB connector on the rear panel connects your power supply to your computer and other GP-IB devices (see Figure
2-2). Accessories (page 12) in Chapter 1 lists the cables and cable accessories that are available from Agilent Technologies.
An GP-IB system can be connected together in any configuration (star, linear, or both) as long as the following rules are
observed
1. The total number of devices, including the computer, is no more than 15.
2. The total length of all the cables used is no more than two meters times the number of devices connected together, up to a
maximum of 20 meters.
Note IEEE Std. 488-1978 states that you should exercise caution if your individual cable lengths exceed 4 m.
Do not stack more than three connector blocks together on any GP-IB connector. The resultant leverage can exert excessive
force on the mounting panels. Make sure that all connectors are fully seated and that the lock screws are firmly finger
tightened. Do not use a screwdriver. Use a screwdriver only for the removal of the screws.
Installation
29
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