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                                     SERVICE MANUAL

                                     240 VOLT
                              ELECTRONIC LOAD MODULE
                                   Agilent 60503B

                                      Part No. 60503-90009




                                  SERVICE MANUAL
                        FOR INSTRUMENTS WITH SERIAL NUMBERS
                                    US37250101

                             For instruments with higher Serial Numbers,
                                   a change page may be included.




Microfiche Part No. 60503-90010                                    Printed in USA: September, 1999
                                                   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 three
years from date of delivery. Agilent Technologies software and firmware products, which are designated by Agilent
Technologies 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 Technologies 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 Technologies. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products returned
to Agilent Technologies for warranty service. Except for products returned to Customer from another country, Agilent
Technologies shall pay for return of products to Customer.

Warranty services outside the country of initial purchase are included in Agilent Technologies' product price, only if
Customer pays Agilent Technologies international prices (defined as destination local currency price, or U.S. or Geneva
Export price).

If Agilent Technologies 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 Technologies.

                                           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 TECHNOLOGIES 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
TECHNOLOGIES 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 Technologies' full line of Support Programs.




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 instrument (provided with a protective earth terminal). To minimize shock hazard, the instrument chassis
and cabinet must be connected to an electrical ground. The instrument must be connected to the ac power supply mains through a three-
conductor 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 the ac power lines (supply mains), connect the protective earth terminal to a protective 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 hazard that could result in personal injury. If the instrument is to be energized via an external autotransformer for
voltage reduction, be certain that the autotransformer common terminal is connected to the neutral (earth 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 line rating label
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 voltages.

               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 the like, which, if not correctly
                     performed or adhered to, could 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 unauthorized 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
                                                Table of Contents

GENERAL INFORMATION                                                 5
    About This Manual                                                5
    Troubleshooting Precautions                                      5
    Manual Revisions                                                 5
    Module Initialization                                            6

VERIFICATION                                                         7
    Introduction                                                     7
    Test Equipment Required                                          7
    CC Mode Test                                                     8
    CV MODE TEST                                                     9
    CR MODE TEST                                                     9
    Transient Operation and Slew Circuit Test                       11
    CC Mode PARD Test                                               11
    CC MODE POWER LIMIT                                             12

REPLACEABLE PARTS                                                   15
    Introduction                                                    15
    How To Order Parts                                              15

DIAGRAMS                                                            25
    Schematic Diagrams                                              25
    Component Location Diagrams                                     25




4
                                                                                                                            1
General Information

About This Manual

This manual is designed to be used along with the Agilent 6050A/6051A Service Manual. It includes service information
that is specific to the 60503B Module. Troubleshooting information such as fault isolation, signature analysis, and
block-level troubleshooting is the same for all modules and is found in the Agilent 6050A/6051A Electronic Load
Mainframe Service Manual. The mainframe Service Manual also explains how to safely disassemble and connect the
module to the mainframe for troubleshooting.

Typically, you will need to refer to this manual when you are performing the verification routines, locating a test point on
the component/test point diagram, referring to the schematics for additional troubleshooting information, and initializing the
module after replacing the EEPROM.

You will also need to refer to this manual for identifying and locating replaceable parts. The parts list identifies all
replaceable parts in the module, and the component/test point diagram identifies the location of all electrical parts in your
module.


Troubleshooting Precautions

                Use extreme caution when troubleshooting the module when it is connected to the mainframe. AC mains
                voltage is present on the exposed pins on the top edge of the mainframe GPIB board and each module
                whenever the units are turned on.


                    Observe all standard antistatic procedures when handling the module assemblies to avoid the possibility
                    of electrostatic damage (refer to mainframe Service Manual) .

To reduce the risk of electrical shock when troubleshooting a defective module, make sure the GPIB board is installed in
the mainframe. Also, to make it easier to troubleshoot the module, connect the module to the GPIB board using an extender
service cable (P/N 06050-60030). This cable is included with the Service kit (P/N 06050-60004), which must be ordered
separately.


Manual Revisions

Agilent Technologies instruments are identified by a ten-character serial number such as US37250101. This manual was
written for Electronic Load Modules with serial numbers equal to and higher than those shown on the title page. If the serial
number of your module is higher than the one shown on the title page, then the module may have hardware or firmware
differences that are not covered in this manual. If there are such differences, they are documented in one or more Manual
Change sheets sent with this manual.




                                                                                                                                5
Module Initialization

EEPROM chip U342 on the Control Board stores the module's GPIB address and model number as well as other constants.
The EEPROM was programmed with the proper constants at the factory. If the Control board or the EEPROM chip (U342)
is replaced, the module must be reinitialized with the proper constants by programming the following commands in the
order indicated. After it has been initialized, the module must also be recalibrated as described in the Operating Manual.


                         60503B Initialization

                         "CAL 1"                                       !   turn calibration mode on
                         "CAL: INIT 240 , 10                           !   initialize default calibration parameters
                         "CAL:SAVE"                                    !   store calibration constants in EEPROM
                         "DIAG:CAL:SEC -5033"                          !   model number
                         "DIAG: CAL: SEC 1 , 16896"                    !   model number suffix
                         "DIAG: CAL: SEC 26 , 1"                       !   module width
                         "DIAG: CAL: SEC 27 , 1"                       !   module type
                         "DIAG: CAL: SEC 28 , 5000"                    !   voltage for soft over power
                         "DIAG:CAL:SEC 29 , 5200"                      !   current for soft over power
                         "*RST"                                        !   reset factory default state
                         "CURR : SLEW 0.167E6"                         !   turn on slew rate
                         "*SAV 0"                                      !   to location 0
                         "CAL 0"                                       !   turn calibration mode off




6
                                                                                                                              2
Verification

Introduction

This chapter contains test procedures that check the operation and calibration of an Agilent 60503A Electronic Load
Module. The tests are performed from the front panel of an Agilent 6050A/6051A Electronic Load Mainframe with the
module installed in slot 1. The tests can also be used to determine which circuits are faulty when troubleshooting. There are
some transient, trigger, and pulse functions that require an GPIB controller and will not be verified with manual testing
from the front panel. The following tests will verify, with a high level of confidence, that the module is operating properly
without testing all of its capabilities.

At the end of this chapter are performance record tables where actual measured values can be recorded.


Test Equipment Required

Table 2-1 lists the test equipment required to perform the tests in this chapter. Test setups for the tests are shown in Figures
2-1 through 2-3. Make sure the sense switch on the rear of the module is set to the LCL position since local sensing is used
in all of the test setups. Use adequate wire gauge when making connections (see Chapter 3 in the Operating Manual).

Note                The Electronic Load must pass the selftest at power turn-on before the following tests can be performed.
                    If the unit fails selftest, refer to the overall troubleshooting procedures in the mainframe Service Manual.

                                  Table 2-1. Test Equipment Required for Verification

         Type                        Required Characteristics                             Recommended Model

60V/60A Source               0 to 500V/0 to 5A                                Agilent 6035A or equivalent
                             0 to 60V/0 to 50A                                Agilent 6032A or equivalent

Current Monitor              0.100 ohms @ 15A                                 9230/15
Resistor                                                                      (Guildline Instruments)

Digital Voltmeter            dc accuracy of 0.01%                             Agilent 3455A, 3456A, or 3458A
                             6 digit readout

Current Probe with           Sensitivity of 1mA/10 mV to 50MHz with           Tektronix A6302 probe, AM503 probe amplifier,
Amplifier and Power          less than 300



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