Agilent Technologies Power Supply 6632B Users Manual 66332A, 6634B Service

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Page Count: 83

Warranty Information
Safety Summary
Notice
Printing History
Instrument Identification
Table of Contents
Introduction
Verification and Performance Tests
Troubleshooting
Principles of Operation
Replaceable Parts List
- Introduction
Diagrams
- Introduction
  - General Schematic Notes
Index
Manual Updates

Service Manual

Agilent Model 66332A

Dynamic Measurement DC Source

and Agilent Model 6632B, 6633B, 6634B

System DC Power Supply

Agilent Part No. 5962-8119 Printed in Malaysia

Microfiche No 6962-8120 October, 2003

Warranty Information

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 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 for

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 contacts,

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.

Safety Summary

The

ollowin

eneral sa

recautions must be observed durin

all

hases o

eration o

this instrument. Failure to com

with these

recautions or with s

eci

ic warnin

s elsewhere in this manual violates sa

standards o

desi

n, manu

acture, and

intended use o

the instrument. A

ilent Technolo

ies assumes no liabilit

or the customer's

ailure to com

with these

requirements.

WARNING

Servicing instructions are for use by service-trained personnel. To avoid dangerous electrical shock, do not perform any servicing

unless you are qualified to do so. Some procedures described in this manual are performed with power supplied to the instrument

while its protective covers are removed. If contacted, the energy available at many points may result in personal injury.

BEFORE APPLYING POWER.

Verify that the product is set to match the available line voltage, the correct line fuse is installed, and all safety precautions (see

following warnings) are taken. In addition, note the instrument's external markings described under "Safety Symbols"

GROUND THE INSTRUMENT.

Before switching on the instrument, the protective earth terminal of the instrument must be connected to the protective conductor

of the (mains) power cord. The mains plug shall be inserted only in an outlet socket that is provided with a protective earth

contact. This protective action must not be negated by the use of an extension cord (power cable) that is without a protective

conductor (grounding). 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.

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.

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.

Any adjustment, maintenance, and repair of this instrument while it is opened and under voltage should be avoided as much as

possible. When this is unavoidable, such adjustment, maintenance, and repair should be carried out only by a skilled person who

is aware of the hazard involved.

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.

SAFETY SYMBOLS

Refer to the table on the following page

WARNING 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.

Caution 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.

Safety Symbol Definitions

Symbol Description

Direct current

Alternating current

Both direct and alternating current

Three-phase alternating current

Earth (ground) terminal

Protective earth (ground) terminal

Frame or chassis terminal

Terminal is at earth potential (Used for measurement and control circuits designed to be

operated with one terminal at earth potential.)

Terminal for Neutral conductor on permanently installed equipment

Terminal for Line conductor on permanently installed equipment

On (supply)

Off (supply)

Standby (supply)

Units with this symbol are not completely disconnected from ac mains when this 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.

In position of a bi-stable push control

Out position of a bi-stable push control

Caution, risk of electric shock

Caution, hot surface

Caution (refer to accompanying documents)

Notice

The information contained in this document is subject to change without notice. Agilent Technologies makes no

warranty of any kind with regard to this material, including but not limited to, the implied warranties of

merchantability, and fitness for a particular purpose.

Agilent Technologies shall not be liable for errors contained herein or for incidental or consequential damages in

connection with the furnishing, performance or use of this material.

This document contains proprietary information which is protected by copyright. All rights are reserved. No part of

this document may be photocopied, reproduced, or translated into another language without the prior written

consent of Agilent Technologies, Inc.

Printing History

The edition and current revision of this manual are indicated below. Reprints of this manual containing minor

corrections and updates may have the same printing date. Revised editions are identified by a new printing date. A

revised edition incorporates all new or corrected material since the previous printing date.

Changes to the manual occurring between revisions are covered by change sheets shipped with the manual. In some

cases, the manual change applies only to specific instruments. Instructions provided on the change sheet will

indicate if a particular change applies only to certain instruments.

Edition 1...............................................................June, 1997

Update 1...............................................................October, 2003

Instrument Identification

Agilent Technologies power supplies are identified by a 10-digit serial number. The format is described as follows:

first two letters indicate the country of manufacture. The next four digits are a code that identify either the date of

manufacture or of a significant design change. The last four digits are a sequential number assigned to each

instrument.

Item Description

US The first two letters indicates the country of manufacture, where US = USA; MY = Malaysia; SG = Singapore.

3631 This is a code that identifies either the date of manufacture or the date of a significant design change.

0101 The last four digits are a unique number assigned to each power supply.

Edition 2...............................................................September, 2000

Table of Contents

Warranty Information 2

Safety Summary 3

Notice 4

Printing History 5

Instrument Identification 5

Table of Contents 6

INTRODUCTION 9

Organization 9

Safety Considerations 9

Related Documents

The following documents are shipped with your dc power supply:

a a User’s Guide, containing installation, operating, and calibration information

a a Programming Guide, containing detailed GPIB programming information.

1 - Introduction

Revisions

Manual Revisions

If changes have been made to your power supply since the publication of this manual, a yellow Manual Change

sheet may be supplied with the manual. It defines the differences between your power supply and the unit described

in this manual. The yellow change sheet may also contain information for correcting errors in the manual. Note that

because not all changes to the product require changes to the manual, there may be no update information required

for your power supply.

Firmware Revisions

You can obtain the firmware revision number by either reading the integrated circuit label, or query the dc power

supply using the GPIB *IDN?' query command (See Chapter 3, ROM Upgrade).

Electrostatic Discharge

CAUTION: The dc power supply has components that can be damaged by ESD (electrostatic discharge).

Failure to observe standard antistatic practices can result in serious degradation of performance,

even when an actual failure does not occur.

When working on the dc power supply, observe all standard, antistatic work practices. These include, but are not

limited to:

— Working at a static-free station such as a table covered with static-dissipative laminate or with a conductive

table mat (Agilent P/N 9300-0797, or equivalent).

— Using a conductive wrist strap, such as Agilent P/N 9300-0969 or 9300-0970.

— Grounding all metal equipment at the station to a single common ground.

— Connecting low-impedance test equipment to static-sensitive components only when those

components have power applied to them.

— Removing power from the dc power supply before removing or installing printed circuit boards.

Verification and Performance Tests

Introduction

This document contains test procedures to verify that the dc power supply is operating normally and is within

published specifications. There are three types of tests as follows:

Built-in Self Tests These tests, run automatically when the power supply is turned on, check most

of the digital circuits and the programming and readback DACs.

Operation Verification These tests verify that the power supply is probably operating normally but do

not check all of the specified operating parameters.

Performance Tests These tests check that the supply meets all of the operating specifications as

listed in the Operating Manual.

NOTE: The dc power supply must pass the built-in self-tests before calibration or any of the verification

or performance tests can be performed. If the supply fails any of the tests or if abnormal test results

are obtained, refer to the troubleshooting procedures in Chapter 3. The troubleshooting procedures

will determine if repair and/or calibration is required.

Test Equipment Required

Table 2-1 lists the equipment required to perform the verification and performance tests. A test record sheet with

specification limits (when test using the recommended test equipment) may be found at the back of this section.

WARNING: SHOCK HAZARD. These tests should only be performed by qualified personnel. During the

performance of these tests, hazardous voltages may be present at the output of the supply.

Table 2-1. Test Equipment Required for Verification and Performance Tests

Type Specifications Recommended Model

Current Monitor

Resistor

15 A (0.1 ohm) 0.04%,

for power supplies up to 15 A output

Guildline 9230/15

DC Power Supply 5 V, 10 A Agilent 6642A, 6653A

Digital Voltmeter Resolution: 10 nV @ 1V

Readout: 8 1/2 digits

Accuracy: 20 ppm

Agilent 3458A or equivalent

Electronic Load 20 V, 5 A minimum, with transient capability Agilent 6060B or equivalent

GPIB Controller HP Series 300 or other controller with full GPIB

capabilities

2 - Verification and Performance Tests

Resistor

(substitute for electronic

load if load is too noisy

for CC PARD test)

1 ohm, 50 W

3 ohm, 100 W (Agilent 66332A/6632B)

24 ohm, 100 W (Agilent 6633B)

99 ohm, 100 W (Agilent 6634B)

1k ohm, 5%, 3W (all models)

Ohmite L50J1R0

Ohmite RLS5R0 (adjustable)

Ohmite RLS25R (adjustable)

Ohmite RLS100 (adjustable)

Agilent 0813-0001

Oscilloscope Sensitivity: 1 mV

Bandwidth Limit: 20 MHz

Probe: 1:1 with RF tip

Agilent 54504A or equivalent

RMS Voltmeter True RMS

Bandwidth: 20 MHz

Sensitivity: 100 µV

Agilent 3400B or equivalent

Variable-Voltage

Transformer

Adjustable to highest rated input voltage range.

Power: 500 VA

Measurement Techniques

Test Setup

Most tests are performed at the rear terminals of the supply as shown in Figure 2-1a. Measure the dc voltage directly

at the +S and -S terminals.

Figure 2-1. Test Setup

Load

resistor

Ammeter

Load

resistor

Ammeter

External

DC supply

-S

+ 240 VDC MAX

-S

+ 240 VDC MAX

-S

+ 240 VDC MAX

DVM or

Current

monitor

RMS voltmeter

Electronic

DVM, Scope, or

RMS voltmeter

Load

(for CV tests)

(for CC tests)

Note: Use dc supply with same polarity

connections for - CC tests.

Replace load wit

h appropriate

resistor for CC noise test.

(see note)

1 k ohm

400 ohm

Verification and Performance Tests - 2

Electronic Load

Many of the test procedures require the use of a variable load capable of dissipating the required power. If a variable

resistor is used, switches should be used to either; connect, disconnect, or short the load resistor. For most tests, an

electronic load can be used. The electronic load is considerably easier to use than load resistors, but it may not be

fast enough to test transient recovery time and may be too noisy for the noise (PARD) tests.

Fixed load resistors may be used in place of a variable load, with minor changes to the test procedures. Also, if

computer controlled test setups are used, the relatively slow (compared to computers and system voltmeters) settling

times and slew rates of the power supply may have to be taken into account. "Wait" statements can be used in the

test program if the test system is faster than the supply.

Current-Monitoring Resistor

To eliminate output-current measurement error caused by voltage drops in the leads and connections, connect the

current monitoring resis tor between the -OUT and the load as a four-terminal device. Connect the current-monitoring

leads inside the load-lead connections directly at the monitoring points on the resistor element.

Operation Verification Tests

To assure that the supply is operating properly, without testing all specified parameters, perform the following test

procedures:

a. Perform the turn-on and checkout procedures given in the Operating Manual.

b. Perform the Voltage Programming and Readback Accuracy test, and the Current Programming and Readback

Accuracy tests from this procedure.

Performance Tests

NOTE: A full Performance Test consists of only those items listed as “Specifications” in Table A-1 of the

Operating Manual, and that have a procedure in this document.

The following paragraphs provide test procedures for verifying the supply's compliance with the specifications listed

in Table A-1 of the Operating Manual. All of the performance test specifications are entered in the appropriate

Performance Test Record Card for your specific model. You can record the actual measured values in the column

provided in this card.

Programming

You can program the supply from the front panel keyboard or from a GPIB controller when performing the tests. The

test procedures are written assuming that you know how to program the supply either; remotely from a GPIB

controller or locally using the control keys and indicators on the supply's front panel. Complete instructions on

remote and local programming are given in the User’s Guide and in the Programming Guide. Programming ratings are

as follows:

2 - Verification and Performance Tests

Table 2-2. Programming Ratings

Model Voltage Rating Full Scale Rating Current Rating Full Scale Rating

Agilent

66332A/6632B

Agilent 6633B

Agilent 6634B

20 V

50 V

100 V

20.020 V

50.045 V

100.1 V

5 A

2 A

1 A

5.0045 A

2.002 A

1.001 A

Constant Voltage (CV) Tests

CV Setup

If more than one meter or if a meter and an oscilloscope are used, connect each to the terminals by a separate pair of

leads to avoid mutual coupling effects. For constant voltage dc tests, connect only to +S and -S, since the unit

regulates the output voltage that appears between +S and -S, and not between the (+) and (-) output terminals. Use

coaxial cable or shielded two-wire cable to avoid noise pickup on the test leads.

Voltage Programming and Readback Accuracy

This test verifies that the voltage programming, GPIB readback and front panel display functions are within

specifications. Note that the values read back over the GPIB should be identical to those displayed on the front

panel.

a. Turn off the supply and connect a digital voltmeter between the +S and the -S terminals as shown in

Figure 2-1a.

b. Turn on the supply and program the supply to zero volts and the maximum programmable current with the load

off.

c. Record the output voltage readings on the digital voltmeter (DVM) and the front panel display. The readings

should be within the limits specified in the performance test record chart for the appropriate model under CV

PROGRAMMING @ 0 VOLTS. Also, note that the CV annunciator is on. The output current reading should be

approximately zero.

d. Program the output voltage to full-scale.

e. Record the output voltage readings on the DVM and the front panel display. The readings should be within the

limits specified in the performance test record chart for the appropriate model under CV PROGRAMMING @

FULL SCALE.

CV Load Effect

This test measures the change in output voltage resulting from a change in output current from full load to no load.

a. Turn off the supply and connect the output as shown in Figure 2-1a with the DVM connected between the +S

and -S terminals.

b. Turn on the supply and program the current to the maximum programmable value and the voltage to the full-

scale value.

c. Adjust the load for the full-scale current as indicated on the front panel display. The CV annunciator on the front

panel must be on. If it is not, adjust the load so that the output current drops slightly.

d. Record the output voltage reading on the DVM connected to +S and -S.

Verification and Performance Tests - 2

e. Open the load and again record the DVM voltage reading. The difference between the DVM readings in steps

(d) and (e) is the load effect voltage, and should not exceed the value listed in the performance test record chart

for the appropriate model under CV LOAD EFFECT.

CV Source Effect

This test measures the change in output voltage that results from a change in ac line voltage from the minimum to

maximum value within the line voltage specifications.

a. Turn off the supply and connect the ac power line through a variable voltage transformer.

b. Connect the output as shown in Figure 2-1a with the DVM connected between the +S and the -S terminals. Set

the transformer to nominal line voltage.

c. Turn on the supply and program the current to the maximum programmable value and the output voltage to the

full-scale value .

d. Adjust the load for the full-scale current value as indicated on the front panel display. The CV annunciator on

the front panel must be on. If it is not, adjust the load so that the output current drops slightly.

e. Adjust the transformer to the lowest rated line voltage (e.g., 104 Vac for a 115 Vac nominal line voltage input).

f. Record the output voltage reading on the DVM.

g. Adjust the transformer to the highest rated line voltage (e.g., 127 Vac for 115 Vac nominal line voltage input).

h. Record the output voltage reading on the DVM. The difference between the DVM reading is steps (f) and (h) is

the source effect voltage and should not exceed the value listed in the performance test record chart for the

appropriate model under CV SOURCE EFFECT.

CV Noise (PARD)

Periodic and random deviations (PARD) in the output (ripple and noise) combine to produce a residual ac voltage

superimposed on the dc output voltage. CV PARD is specified as the rms or peak-to-peak output voltage in the

frequency range specified in the User’s Guide.

a. Turn off the supply and connect the output as shown in Figure 2-1a to an oscilloscope (ac coupled) between the

(+) and the (-) terminals. Set the oscilloscope's bandwidth limit to 20 MHz and use an RF tip on the oscilloscope

probe.

b. Turn on the supply and program the current to the maximum programmable value and the output voltage to the

full-scale value.

c. Adjust the load for the full-scale current value as indicated on the front panel display.

d. Note that the waveform on the oscilloscope should not exceed the peak-to-peak limits in the performance test

record chart for the appropriate model under CV NOISE (PARD).

e. Disconnect the oscilloscope and connect an ac rms voltmeter in its place. The rms voltage reading should not

exceed the RMS limits in the performance test record chart for the appropriate model under CV NOISE

(PARD).

2 - Verification and Performance Tests

Transient Recovery Time

This test measures the time for the output voltage to recover to within the specified value following a 50% change in

the load current.

tttt

Transient

Unloading

Transient

Figure 2-2. Transient Waveform

a. Turn off the supply and connect the output as in Figure 2-1a with the oscilloscope across the +S and the -S

terminals.

b. Turn on the supply and program the output voltage to the full-scale value and the current to the maximum

programmable value.

c. Set the load to the Constant Current mode and program the load current to 1/2 the power supply full-scale rated

current.

d. Set the electronic load's transient generator frequency to 100 Hz and its duty cycle to 50%.

e. Program the load's transient current level to the supply's full-scale current value and turn the transient generator

on.

f. Adjust the oscilloscope for a waveform similar to that in Figure 2-2.

g. The output voltage should return to within the specified voltage (v) in less than the specified time (t). Check

both loading and unloading transients by triggering on the positive and negative slope.

Constant Current (CC) Tests

CC Setup

Follow the general setup instructions in the Measurement Techniques paragraph and the specific instructions given

in the following paragraphs.

Current Programming and Readback Accuracy

This test verifies that the current programming and readback are within specification.

a. Turn off the supply and connect the current monitoring resistor across the power supply output and the DVM

across the resistor as shown in Figure 2-1a. See "Current Monitoring Resistor" for connection information.

b. Turn on the supply and program the output voltage to 5 V and the current to zero.

c. Divide the voltage drop (DVM reading) across the current monitoring resistor by its resistance to convert to

amps and record this value (Iout). The reading should be within the limits specified in the performance test

record card for the appropriate model under CC PROGRAMMING @ 0 AMPS.

d. Set the current readback range to High and program the output current to 20mA. For model 66332A, set the

current detect mode to “DC”. Repeat step C to get the Iout. Record the current reading on the front panel

display. The reading should be within the limits specified in the performance test record card for the appropriate

model under Current Readback Accuracy @ 20mA (High Range).

Verification and Performance Tests - 2

e. Program the output current to full-scale .

f. Divide the voltage drop (DVM reading) across the current monitoring resistor by its resistance to convert to

amps and record this value (Iout). Also, record the current reading that appears on the front panel display. The

readings should be within the limits specified in the performance test record card for the appropriate model under

CC PROGRAMMING @ FULL-SCALE.

Current Sink (-CC) Operation

This test verifies current sink operation and readback.

a. Turn off the supply and connect the output as shown in Figure 2-1a, except connect a dc power supply in place

of the electronic load as indicated. Connect the DMM across the current shunt.

b. Set the external power supply to 5 V and the current limit approximately 20% above the full scale current rating

of the supply under test.

c. Turn on the supply under test and program the output voltage to zero and full scale output current. The current

on the UUT display should be approximately full scale current negative.

d. Divide the voltage drop across the current monitoring resistor by its resistance to obtain the current sink value

in amps and subtract this from the current reading on the display. The difference between the readings should be

within the limits specified in the performance test record chart under CURRENT SINK READBACK.

Low Range Current Readback Accuracy

This test verifies the readback accuracy of the 20 milliampere current range.

a. Turn off the supply and connect the output as shown in Figure 2-1b. Set the DMM to operate in current mode.

b. Turn on the supply under test and program the output voltage to zero and full scale output current. The current

on the UUT display should be approximately 0 mA.

c. Record the current reading on the DMM and the reading on the front panel display. The difference between the

two readings should be within the limits specified in the performance test record chart under 20mA RANGE

CURRENT READBACK ACCURACY @ 0A.

d. Program the output voltage to 20V and record the current reading on the DMM and the reading on the front

panel display. The difference between the readings should be within the limits specified in the performance test

record chart for the appropriate model under 20mA RANGE CURRENT READBACK ACCURACY @ 20mA

e. Turn off the supply and connect the output and an external supply as shown in Figure 2-1c. Set the DMM to

operate in current mode.

f. Turn on the external supply and program it to 20 V and 1 amp. Then program the supply under test to zero volts

and 1 amp. The UUT display should read approximately −20 mA.

c. Record the current reading on the DMM and the reading on the front panel display. The difference between the

two readings should be within the limits specified in the performance test record chart under 20mA RANGE

CURRENT READBACK ACCURACY @ −20 mA.

CC Load and Line Regulation

These tests (CC Load Effect and CC Source Effect given below) are tests of the dc regulation of the power supply's

output current. To insure that the values read are not the instantaneous measurement of the ac peaks of the output

current ripple, several dc measurements should be made and the average of these readings calculated. An example of

how to do this is given below using an Agilent 3458A System Voltmeter programmed from the front panel. Set up the

voltmeter and execute the "Average Reading" program follows:

a. Program 10 power line cycles per sample by pressing NPLC 1 0 ENTER .

b. Program 100 samples per trigger by pressing (N Rdgs/Trig) 1 0 0 ENTER .

2 - Verification and Performance Tests

c. Set up voltmeter to take measurements in the statistical mode as follows:

Press Shift key, f0, Shift key, N

Press ^ (up arrow) until MATH function is selected, then press >.

Press ^ (up arrow until STAT function is selected then press (ENTER).

d. Set up voltmeter to read the average of the measurements as follows:

Press Shift key, f1, Shift key, N.

Press down arrow until RMATH function is selected, then press >.

Press ^ (up arrow) until MEAN function is selected, then press ENTER.

e. Execute the program by pressing f0, ENTER, TRIG, ENTER

f. Wait for 100 readings and then read the average measurement by pressing f1, ENTER.

To repeat the measurement, perform steps (e) and (f).

CC Load Effect

This test measures the change in output current for a change in load from full scale output voltage to short circuit.

a. Turn off the supply and connect the output as shown in Figure 2-1a with the DVM connected across the current

monitoring resistor.

b. Turn on the supply and program the current to the full scale current value and the output voltage to the

maximum programmable voltage value.

c. Adjust the load in the CV mode for full scale voltage as indicated on the front panel display. Check that the CC

annunciator of the UUT is on. If it is not, adjust the load so that the output voltage drops slightly.

d. Record the output current reading (DVM reading/current monitor resistance value in ohms). You may want to

use the average reading program described under “CC Load and Line Regulation”.

e. Short the load switch and record the output current reading. The difference in the current readings in steps (d)

and (e) is the load effect and should not exceed the limit specified in the performance test record chart for the

appropriate model under CC LOAD EFFECT.

CC Source Effect

This test measures the change in output current that results when the AC line voltage changes from the minimum to

the maximum value within the specifications.

a. Turn off the supply and connect the ac power line through a variable voltage transformer.

b. Connect the output terminals as shown in Figure 2-1a with the DVM connected across the current monitoring

resistor. Set the transformer to the nominal line voltage.

c. Turn on the supply and program the current to the full scale value and the output voltage to the maximum

programmable value.

d. Adjust the load in the CV mode for full scale voltage as indicated on the front panel display. Check that the CC

annunciator of the UUT is on. If it is not, adjust the load so that the output voltage drops slightly.

e. Adjust the transformer to the lowest rated line voltage.

f. Record the output current reading (DVM reading/current monitoring resistor in ohms). You may want to use the

average reading program described under “CC Load and Line Regulation”.

g. Adjust the transformer to the highest rated line voltage.

h. Record the output current reading again. The difference in the current readings in steps (f) and (h) is the CC

source effect and should not exceed the values listed in the performance test record card under CC SOURCE

EFFECT.

Verification and Performance Tests - 2

CC Noise (PARD)

Periodic and random deviations (PARD) in the output combine to produce a residual ac current, as well, as an ac

voltage superimposed on the dc output. Constant current (CC) PARD is specified as the rms output current in a

frequency range 20 Hz to 20 Mhz with the supply in CC operation.

a. Turn off the supply and connect the load, monitoring resistor, and rms voltmeter across the monitoring resistor

as shown in Figure 2-1a. The Current Monitoring resistor may have to be substituted by one with a higher

resistance and power rating, such as a 1 ohm 50 W current shunt in series with the appropriate 3, 24, or 99 ohm

resistor, to get the RMS voltage drop high enough to measure with the RMS voltmeter. Leads should be as short

as possible to reduce noise pick-up. An electronic load may contribute ripple to the measurement so if the RMS

noise is above the specification a resistive load may have to be substituted for this test.

b. Check the test setup for noise with the supply turned off. Other equipment (e.g. computers, DVMs, etc.) may

affect the reading.

c. Turn on the supply and program the current to full scale and the output voltage to the maximum programmable

value.

d. The output current should be at the full scale rating with the CC annunciator on.

e. Divide the reading on the rms voltmeter by the monitor resistor to obtain rms current. It should not exceed the

values listed in the performance test record card under CC NOISE (RMS).

Performance Test Equipment Form

Test Facility:_________________________ Report Number ________________________

____________________________________ Date _________________________________

____________________________________ Customer _____________________________

____________________________________ Tested By ____________________________

Model ______________________________ Ambient Temperature (C) ________________

Serial No. ____________________________ Relative Humidity (%) ___________________

Options _____________________________ Nominal Line Frequency __________________

Firmware Revision ____________________

Special Notes:

Test Equipment Used:

Description Model No. Trace No. Cal. Due Date

AC Source _________________ _________________ _________________

DC Voltmeter _________________ _________________ _________________

RMS Voltmeter _________________ _________________ _________________

Oscilloscope _________________ _________________ _________________

Electronic Load _________________ _________________ _________________

Current Shunt _________________ _________________ _________________

_________________ _________________ _________________

2 - Verification and Performance Tests

Performance Test Record Forms

Model Agilent 66332A OR Agilent6632B

Report No _______________ Date __________________

Test Description Minimum

Specs. Results* Maximum

Specs.

Constant Voltage Tests

Voltage Programming and Readback

Low Voltage (0V) Vout

Front Panel Display Readback

High Voltage (Full Scale) Vout

Front Panel Display Readback

− 10 mV

Vout − 3 mV

19.980 V

Vout − 9 mV

__________

+ 10 mV

Vout + 3 mV

20.020 V

Vout + 9 mV

Load Effect − 2 mV __________ + 2 mV

Source Effect − 0.5 mV __________ + 0.5 mV

PARD (Ripple and Noise)

Peak-to-Peak

RMS

N/A

__________

+ 3 mV

+ 0.3 mV

Transient Response

Voltage in 100 µs

Vout − 20 mV

__________

Vout + 20 mV

Constant Current Tests

Current Programming and Readback(High Range)

CC Programming Accuracy @ 0A

Current Readback Accuracy @ 20mA (High Range)

CC Programming @ Full Scale

Current Readback Accuracy @ Full Scale

− 3.32mA

Iout − 0.54 mA

4.9955 A

Iout − 10.5 mA

__________

+ 3.32 mA

Iout + 0.54 mA

5.0045 A

Iout + 10.5 mA

Current Sink Readback Isink − 11.1mA

__________ Isink + 11.1mA

20 mA Range Current Readback

Readback Accuracy @ 0 A

Readback Accuracy @ + 20 mA

Readback Accuracy @ − 20 mA

− 2.5 µA

Iout − 22.5 µA

__________

+ 2.5 µA

Iout + 22.5 µA

PARD (Current Ripple and Noise)

RMS

N/A

__________

+ 2.0 mA

Load Effect − 1.0 mA __________ + 1.0 mA

Source Effect − 0.5 mA __________ + 0.5 mA

* Enter your test results in this column

Verification and Performance Tests - 2

Model Agilent 6633B Report No _______________ Date __________________

Test Description Minimum

Specs. Results* Maximum

Specs.

Constant Voltage Tests

Voltage Programming and Readback

Low Voltage (0V) Vout

Front Panel Display Readback

High Voltage (Full Scale) Vout

Front Panel Display Readback

− 20 mV

Vout − 6 mV

49.955 V

Vout − 21 mV

__________

+ 20 mV

Vout + 6 mV

50.045 V

Vout + 21 mV

Load Effect − 4 mV __________ + 4 mV

Source Effect − 1.0 mV __________ + 1.0 mV

PARD (Ripple and Noise)

Peak-to-Peak

RMS

N/A

__________

+ 3 mV

+ 0.5 mV

Transient Response

Voltage in 100 µs

Vout − 50 mV

__________

Vout + 50 mV

Constant Current Tests

Current Programming and Readback(High Range)

CC Programming Accuracy @ 0A

Current Readback Accuracy @ 20mA (High Range)

CC Programming @ Full Scale

Current Readback Accuracy @ Full Scale

− 1.53 mA

Iout − 0.29 mA

1.998 A

Iout − 4.25 mA

__________

+ 1.53 mA

Iout + 0.29 mA

2.002 A

Iout + 4.25 mA

Current Sink Readback Isink − 4.85mA

__________ Isink + 4.85mA

20 mA Range Current Readback

Readback Accuracy @ 0 A

Readback Accuracy @ + 20 mA

Readback Accuracy @ − 20 mA

− 2.5 µA

Iout − 22.5 µA

__________

+ 2.5 µA

Iout + 22.5 µA

PARD (Current Ripple and Noise)

RMS

N/A

__________

+ 2.0 mA

Load Effect − 1.0 mA __________ + 1.0 mA

Source Effect − 0.25 mA __________ + 0.25 mA

* Enter your test results in this column

2 - Verification and Performance Tests

Model Agilent 6634B Report No _______________ Date __________________

Test Description Minimum

Specs. Results* Maximum

Specs.

Constant Voltage Tests

Voltage Programming and Readback

Low Voltage (0V) Vout

Front Panel Display Readback

High Voltage (Full Scale) Vout

Front Panel Display Readback

−50 mV

Vout −12 mV

99.9 V

Vout −42 mV

__________

+50mV

Vout +12mV

100.1 V

Vout +42mV

Load Effect −5mV __________ + 5 mV

Source Effect −1mV __________ + 1 mV

PARD (Ripple and Noise)

Peak-to-Peak

RMS

N/A

__________

+5mV

+0.6mV

Transient Response

Voltage in 100 µsVout −100 mV __________ Vout + 100 mV

Constant Current Tests

Current Programming and Readback(High Range)

CC Programming Accuracy @ 0A

Current Readback Accuracy @ 20mA (High Range)

CC Programming @ Full Scale

Current Readback Accuracy @ Full Scale

−0.76 mA

Iout −0.29 mA

0.999 A

Iout −2.25 mA

__________

+0.76mA

Iout + 0.29 mA

1.001 A

Iout + 2.25 mA

Current Sink Readback Isink −2.85 mA __________ Isink +2.85mA

20 mA Range Current Readback

Readback Accuracy @ 0 A

Readback Accuracy @ + 20 mA

Readback Accuracy @ −20 mA

−2.5 µA

Iout −22.5 µA

__________

+2.5µA

Iout + 22.5 µA

PARD (Current Ripple and Noise)

RMS N/A __________ + 2.0 mA

Load Effect −1.0 mA __________ + 1.0 mA

Source Effect −0.25 mA __________ + 0.25 mA

* Enter your test results in this column

Troubleshooting

Introduction

WARNING: SHOCK HAZARD. Most of the troubleshooting procedures given in this chapter are performed

with power applied and protective covers removed. Such maintenance should be performed only

by service trained personnel who are aware of the hazards (for example, fire and electrical shock).

CAUTION: This instrument uses components which can either be damaged or suffer serious performance

degradation as a result of ESD (electrostatic discharge). Observe the standard antistatic precautions

to avoid damage to the components. An ESD summary is given in Chapter 1.

This chapter provides troubleshooting and repair information for the dc power supply. Before attempting to

troubleshoot the dc power supply, first check that the problem is with the supply itself and not with an associated

circuit. The verification tests in Chapter 2 enable you to isolate a problem to the dc power supply. Troubleshooting

procedures are provided to isolate a problem to one of the circuit boards or a particular circuit. Figure 3-2 shows the

location of the circuit boards and other major components of the unit. If a problem has been isolated to the A1

Control circuit board, additional troubleshooting procedures are available to isolate the problem to the defective

component(s). Disassembly procedures are provided at the end of this chapter and should be referred to, as required,

in order to gain access to and/or replace defective components.

If a component is defective, replace it and then conduct the verification test given in Chapter 2.

NOTE: Note that when certain components are replaced, the supply must be calibrated (See "Post Repair

Calibration" later in this chapter). If the A2 Interface Board is replaced, the supply must be

initialized before it is calibrated. See "Initialization" later in this chapter.

Chapter 5 lists all of the replaceable parts for the power supplies. Chapter 6 contains schematics, test point

measurements, and component location diagrams to aid you in troubleshooting the supply.

3 - Troubleshooting

Test Equipment Required

Table 3-1 lists the test equipment required to troubleshoot the power supply. Recommended models are listed.

Table 3-1. Test Equipment Required for Troubleshooting

Type Purpose Recommended Model

GPIB Controller To communicate with the supply via the

GPIB interface

HP Series 300

Digital Voltmeter To check various voltage levels Agilent 3458A

Oscilloscope To check waveforms and signal levels Agilent 54504A/54111A

Electronic Load To test operation of current circuit Agilent 6060B

IC Test Clips To access IC pins AP Products No. LTC

Ammeter/Current

Shunt

To measure output current Guildline 9230/15

Overall Troubleshooting

Overall troubleshooting procedures for the power supply are given in the Figure 3-1. The procedures first check that

neither an AC input, nor a bias supply failure is causing the problem and that the supply passes the turn-on self test

(error annunciator stays off). The normal turn-on, self-test indications are described in the "Checkout Procedure" in

Chapter 3 of the User's Guide.

If the supply passes the self test and there are no obvious faults, you should perform the verification procedures in

Chapter 2 from the front panel to determine if any functions are not calibrated or are not operating properly. Then

program and read back a voltage via the GPIB to see if the supply responds properly to bus commands. If the supply

fails any of the tests, you will be directed to the applicable flow chart or troubleshooting procedure.

Flow Charts

Troubleshooting flow charts are given in Figure 3-1 sheets 1-10. Several flow charts make reference to the test points

listed in Chapter 6. The circuit locations of the test points are shown on the schematics and on the component

location diagrams in Chapter 6.

Troubleshooting - 3

Turn on unit and observe the

dis

. Unit should dis

all of

the se

ments and annunciators,

the address and then after self

test dis

either an erro

messa

e or

o to the meterin

mode.

Protect

nnunciato

On?

Dis

comes

on?

3J2-5 held

low?

Yes

lace A2

Interface board

No +5V

A3J2-8?

Troubleshoot A1

+5V Interface Bias

circuit, W6 or W7.

Yes

RI?

lace A3 Front

Panel/Dis

board

Error Messa

e? See Error Messa

Table 3-2

Yes

OV?

OC?

Go to

"Troubleshootin

OV at Turn-on"

(

sheet 4

)

Yes

Check RI in

ut, A2

Interface board

Yes

Disable OCP and

check for normal

eration

Yes

lace internal

fuse F300

Go to sheet 2

FS?

For OT check fan

circuit, thermal

sensor RT301

Fuse blown?

Yes

Go to "FS indicated

but fuse is OK"

(

sheet 6

)

Figure 3-1 Sheet 1. Main Flowchart

3 - Troubleshooting

Continued from

sheet 1

Pro

ram Volta

and Current full

scale, enable out

with no load.

Measure Volta

e at

out

ut terminals.

Volta

e close

rammed

value?

Calibrate Volta

Yes

Out

ut Volta

near zero?

Go to

"Troubleshootin

Out

ut Volta

(

sheet 7

)

Yes

If out

ut is OK but

meter wron

, re

lace

2. If both are off,

check

ain of

Volta

e Monito

lifier A1U315B

Dis

and

measured

volta

e OK?

Dis

and

measured

current OK?

Load out

ut to

unit into CC and

measure out

current with extrenal

mete

Yes

Current close

rammed

value?

Calibrate Current

Yes

Current >

and unit not in

CC?

Go to

"Troubleshootin

Current limit"

(

sheet 10

)

Yes

If out

ut is OK but

meter wron

, re

lace

2. If in CC but both

are off, check

ain of

Current Monito

lifiers and

Monitor Resisto

R403/473 values. If

the current is lowe

than

rammed

and UNRe

dis

ed, check

1Q307 and Out

Sta

Pro

ram OV below

out

ut volta

Yes

OV Tri

s? No

Pro

ram OV to

maximum and reset

rotection

Yes

Go to

"Troubleshootin

Unit Does not OV”

(

sheet 11

)

Go to sheet 3

Figure 3-1 Sheet 2. Main Flowchart (continued)

Troubleshooting - 3

Figure 3-1 Sheet 3. Main Flowchart (continued)

3 - Troubleshooting

Connect a DC cou

led

sco

e set to 1mS/20V/

div across the out

and turn on the su

while observin

the

sco

e for a momentar

ulse

reater than the

ratin

Does the su

overshoot? Yes

Disable the OV circuit

as described in

ara

h "Disablin

Protection Features"

Out

zero

volts?

A1R350-2?

2 or W7 Defective

Yes

+.3V

U306B-7?

Yes

Check C336, R356,

R351, R349

(

1-2

)

and

U306B

+4V

U306-8?

Yes

Check C335, R354,

R350

(

1-2

)

and U306B

Go to sheet 5

Yes

Go to “Troubleshootin

h Out

ut Volta

e”

(

sheet 7

)

Figure 3-1 Sheet 4. OV at Turn-On

Troubleshooting - 3

Continued from

sheet 4

1U306B-2,

OV_Detect*, High? No U306B-7 < pin 8?

Yes Check U306B, A2

Check R349, R351,

R356

Yes

1R438,

OV_SCR*, +0.6V?

Yes

Check R441, Q318B,

2, Interface Board

Check A1CR342,

Q318A, B & D and

associated

components

Yes Note: OV_SCR* is

normally a pulse that

goes low for 5us to trip

the OV SCR, CR342.

Connect a DC coupled

scope across the

output and press

Protect Clear several

times while observing

the scope

Pulses high?

Go to "Troubleshooting

High Output Voltage"

(sheet 12)

Yes

U306B-8 3.8V?

Check OV_Prog,

Imon_Comp, C335,

R350, R354

Figure 3-1 Sheet 5. OV at Turn-On (continued)

3 - Troubleshooting

Pro

ram out

ut on,

volta

e and current full

scale then check

out

ut volta

Troubleshoot Fuse

divider and am

lifie

circuit

(

R393/394,

U305

)

Disable the

rotection

feature b

simultaneousl

ressin

the 0 and 9

ress the ^ ke

until the dis

reads

"No Protect Off",

ress

the U

Arrow to dis

"No Protect On" then

ress ente

FS Prot off and

Out

ut OK? Calibrate unit

Yes

FUSE si

nal OK?

Check FUSE si

nal

U305B-7

(

rox.

+2.8V with 20V out

)

Problem ma

defective A2 or one of

the volta

es to A2

(

Vmon, Imon

Imon

L, Imon

)

> its'

bias volta

e +5Vs

Yes

Out

ut V >

rammed

value?

Go to "Troubleshootin

h Out

ut Volta

(

sheet 12

)

Yes

Figure 3-1 Sheet 6. FS Indicated but Fuse OK

Troubleshooting - 3

Program full scale

voltage and current

and enable output.

Measure output

voltage with an

external voltmeter.

Display zero V but

output OK?

Check W7 (Vmon) and

2, Interface board

Yes

CV or CC

nnunciator on?

CC?Yes Displays current

equal to prog

value?

Yes

Check for short across

output such as output

cap C382, CR342, etc.

Yes

CC_Prog, R360

-4.7V

Check W7, A2

Interface Board

IMon_H,

U309A-6,~0V

Yes

Check Positive Current

Control Circuit, U310B

Yes

Check High Range

Current Monitor Amp,

U309A

Go To sheet 9

Q305A base

-11.4V

PM_Inhibit, R335

Low

Troubleshoot Turn-On

Control Circuit, Q305B,

C, D and U305A

Yes

Check W7, A2

Interface Board

Go to sheet 8

Yes

Figure 3-1 Sheet 7. No Output Voltage

3 - Troubleshooting

Continued from

sheet 7

Q302 base

-5V

Check C330, R333,

R346, and Q302

Q307 collector to

emitte

4V?

Check Q302, Q307,

R324 and R326

Q303 base >1.2V

(meas. from +Out)

Check +Rail and

Out

ut Sta

Yes

>1V across R323

Check Q301, Q305

circuits

Yes

Check C331, C333,

C339 and Q306

circuits

Yes

Figure 3-1 Sheet 8. No Output Voltage (continued)

Troubleshooting - 3

Continued from

sheet 7

Pro

R401

-4.7V

Check W7, A2

Interface Board

VMon,

U315B-7

~0V

Yes

Check Volta

e Monito

lifier, U315B,

circuit

Check Volta

e Control,

Circuit U315

Yes

Figure 3-1 Sheet 9 No Output Voltage (continued)

3 - Troubleshooting

Continued from

sheet 2

Pro

, R360,

-4.8V

Check A2 Interface

Board

Imon

H, U309A-6

~+3.5V

Dro

across R473

~0.25V

Check Hi

h Ran

Current Monito

lifie

Yes

Check Positive Current

Control Circuit

Yes Yes

Check R473

Figure 3-1 Sheet 10. No Current Limit

Troubleshooting - 3

Pro

ram the out

volta

e and current to

the full scale value and

the OV to 1/2.

~+2V

R350

U306B-8

~+2V

2 Interface Board o

cable W7 defective

Check R350, C335 and

U306B

Yes

U306B-7

~+4V

Yes

Check R349, R351,

R356, C336 and U306

U306B-2,

DETECT*,

Low?

Yes

Check U306B

OV_SCR* pulse @

R438 low 5us

Yes

Check Q318B, R441,

2 Interface Board

Q318D Collector

pulses high 5us

Check Q318A, B and D

and associated circuits

Yes

Check A1CR342

Yes

Reset the OV

(

Shift,

Prot Clr

)

and observe

the OV

SCR* si

nal.

Each time OV is reset

the unit will

enerate

another OV si

nal. The

ulse

(

SCR*

)

is a

roximatel

5us

lon

See note

Figure 3-1 Sheet 11. Unit Does Not OV

3 - Troubleshooting

Disable the OV ca

abilit

shortin

R351. After the

rotection is disabled,

ram

the out

ut volta

e to zero,

current to full scale and Out

ON. If the unit is in "Protect"

mode, Press Protect Clear. The

out

ut should now

o hi

h and

not tri

the OV.

Is the CV

annunciator on

Vmon,

U315B-7,

OK ?*

Check Volta

e Monito

lifier, U315B

circuit

Pro

R401

~0V

Yes

2 Interface Board

Check Volta

e Control

U315A, circuit

Yes

Volta

e <0.6V

Measure volta

e at the

base of Q303 with

res

ect to its' emitte

Yes

Troubleshoot Volta

Gain Sta

Troubleshoot Out

Sta

Yes

* V

mon should be a

roximatel

6632B or 66332A Vout/4.25

6633B Vout/10.52

6634B Vout/21

Figure 3-1 Sheet 12. High Output Voltage

Troubleshooting - 3

Specific Troubleshooting Procedures

Power-on Self-test Failures

The power-on self-test sequence tests most of the digital and DAC circuits. If the supply fails self-test, the display

"ERR" annunciator will come on. You can then query the unit to find out what the error(s) are. When an error is

detected, the output is not disabled so you can still attempt to program the supply to help troubleshoot the unit.

Table 3-2 lists the self test errors and gives the probable cause for each error.

NOTE: A partial self test is performed when the *TST? query is executed. Those tests that interfere with

normal interface operation or cause the output to change are not performed by *TST?. The return

value of *TST? will be zero if all tests pass, or the error code of the first test that failed. The power

supply will continue normal operation if *TST? returns a non-zero value.

Table 3-2. Self-Test Error Codes/Messages

Error Code Description Probable Cause

E1 Checksum in Read-only Non-volatile ROM A2 Interface Bd

E2 Checksum in Config Non-volatile ROM A2 Interface Bd

E3 Checksum in Cal Non-volatile ROM A2 Interface Bd

E4 Checksum in State Non-volatile ROM A2 Interface Bd

E5 Checksum in RST Non-volatile ROM A2 Interface Bd

E10 RAM test failed A2 Interface Bd

E11 12 bit DAC test failed, 0 is written to DAC U241A and B,

ADC U242 is checked for 133 +/- 7 counts

A2 Interface Bd

E12 12 bit DAC test failed, 4095 is written to DAC U241A

and 0 to B, ADC U242 is checked for 71 +/- 7 counts

A2 Interface Bd

E13 12 bit DAC test failed, 0 is written to DAC U241A and

4095 to B, ADC U242 is checked for 71 +/- 7 counts

A2 Interface Bd

E14 12 bit DAC test failed, 4095 is written to DAC U241A

and B, ADC U242 is checked for 10 +/- 7 counts

A2 Interface Bd

E15 8 bit DAC test failed, 10 and 240 are written to DAC

U244, ADC U242 is checked for 10 and 240 +/- 7 counts

A2 Interface Bd

E80 Dig I/O test failed, SEC_PCLR written low and high,

read back through Xilinx

A2 Interface Bd

E213 RS-232 input buffer overrun A2 Interface Bd

E216 RS-232 framing error A2 Interface Bd

E217 RS-232 parity error A2 Interface Bd

E218 RS-232 UART input overrun A2 Interface Bd

E220 Front Panel comm UART input overrun A3 Front Panel/Display Bd

E221 Front Panel comm UART framing error A3 Front Panel/Display Bd

E222 Front Panel comm UART parity error A3 Front Panel/Display Bd

E223 Front Panel firmware input buffer overrun A3 Front Panel/Display Bd

3 - Troubleshooting

CV/CC Status Annunciators Troubleshooting

The CV/CC annunciators are particularly helpful when troubleshooting a unit with no output. If the unit has no

output voltage or current and one of the annunciators is on then the problem is in the control circuit associated with

that annunciator. An example of how this might be useful would be in a case where the voltage and current are

programmed to some positive value, there is no output voltage and the CV annunciator is on. This indicates that the

problem is probably in the Voltage Amplifier circuit. If the CC annunciator were on then the problem would likely

be in the Current Amplifier. If UNR is indicated then neither the voltage nor the current circuits are in control and

the problem would be in circuits after the gating diodes such as the driver or output regulator stages.

When troubleshooting the CV/CC status annunciators or the status readback circuits, first measure the voltage drop

across the gating diodes; A1 D328 (CV) and D325 (CC). A conducting diode indicates an active (ON) control

circuit. This forward drop is applied to the input of the associated status comparator (U306A and D respectively) and

drives the output (CV_DETECT* or CC_DETECT*) low. The low signal indicates an active status which is sent to

the A2 board microprocessor. The front panel CV annunciator indicates when the CV mode is active

(CV_DETECT* is low). The front panel CC annunciator indicates when the CC mode is active (CC_DETECT* is

low). The UNREGULATED (UNR) annunciator comes on when neither the CV nor CC is active.

Bias and Rail Voltages

Before troubleshooting any circuit check the bias and/or rail voltages to make sure that they are not the cause. Table

3-3 lists the bias and rail voltage test points for the A1 Main Control , A2 Interface, and the A3 Front Panel/Display

boards. Unless otherwise noted, all voltages are measured with respect to secondary common (R473-3) with no load

on the supply.

Table 3-3. Bias and Reference Voltages

Bias Test Point

(See Figure 6-1)

Common Measurement

+Rail1 (Agilent

6632B/66332B)

A1 TP 310 - Output +38V 10% (800mV P/P)

+Rail1 (Agilent 6633B) A1 TP 310 - Output +73V 10% (2.5V P/P)

+Rail1 (Agilent 6634B) A1 TP 310 - Output +130V 10% (2.2V P/P)

-Rail1 (Agilent

6632B/66332B)

A1 TP 311 - Output -9.8V 10% (400mV P/P)

-Rail1 (Agilent 6633B) A1 TP 311 - Output -10.2V 10% (300mV P/P)

-Rail1 (Agilent 6634B) A1 TP 311 - Output -10.5V 10% (300mV P/P)

+5V secondary A1 R317 Secondary Common +5V 4%

+12V secondary A1 D470 cathode Secondary Common +12V 5%

+15V secondary A1 R318 Secondary Common +15V 4%

-12V secondary A1 D471 anode Secondary Common -12V 5%

-15V secondary A1 R315 Secondary Common -15V 4%

V_Ref A1 R475 Secondary Common +2.5V 6%

+5V Interface2E306 (red wire) E 306 (black wire) +5V 3%

1 Measured with respect to - Output at nominal ac input line voltage

2 Measured with reference to Interface Ground (E306 black wire)

Troubleshooting - 3

J307 Voltage Measurements

J307 connects the A1 Main Board Assembly to the A2 Interface Assembly. Table 3-4 provides a quick method of

determining if the voltages between these assemblies are within the normal range. If any of these voltages is outside

the normal range, refer to the flowcharts to further troubleshoot the circuit associated with the abnormal voltage.

Table 3-4. Voltage Measurements at J307 (A2 Interface to A1 Main board)

A1J307

Pin #

Signal Name CV Mode

Full Scale Voltage

No Load

CC Mode

Full Scale Voltage

Full Load

1 PM_INHIBIT (Enabled) 0 0

2 OV_SCR* +5 +5

3 OV_PROG +3.9 +3.9

4 FAN_PROG +2.8 +3.8

5 OV_DETECT* +5 +5

6 SW_POS (Norm) +5 +5

7 RANGE_SELECT (High) 0 0

8 OS_TRIM_NEG (COMP) +1.7 +1.7

OS_TRIM_NEG (SCPI) +4.0 +4.0

9+5Vs +5 +5

10 COMMON 0 0

11 COMMON 0 0

12 +15Vs +15 +15

13 -15Vs -15 -15

14 HS_THERM (@25C) +2.5 +2.5

15 FUSE +2.4 +2.6

16 IMON_H 0 +3.5

17 IMON_L

IMON_L (@20mA Out)

+4.8

+14.7

+4.8

18 IMON_P 0 0

19 VMON +4.8 +4.8

20 COMMON 0 0

21 COMMON 0 0

22 COMMON 0 0

23 COMMON 0 0

24 CV_PROG -4.8 -4.8

25 CC_PROG -4.8 -4.8

26 CC_DETECT* +5 0

27 CCN_DETECT* +5 +5

28 CV_DETECT* 0 +5

3 - Troubleshooting

Manual Fan Speed Control

Under some circumstances such as testing acoustical devices where the fan noise would interfere with the test, it

would be advantageous to reduce the fan speed. If the test requires a very light load, the ambient temperature is low

and the duration of the test is short, the fan speed may be temporarily reduced. The turn-on default is "Automatic" so

this procedure must be performed, as needed, every time the line voltage is turned on. To manually control the fan

speed:

a. Simultaneously depress the "0" and "9” keys. EEINIT <model> will be displayed.

b. Using the Up/Down annunciator keys select FAN:MODE<AUTO.>.

c. Using the Up/Down arrows select FAN:MODE <MAN>

d. Press "Enter"

e. Simultaneously depress the "0" and "9" keys. EEINIT <model> will be displayed.

f. Using the Up/Down annunciator keys select FAN:SPEED <data>

g. Press "Enter Number".

h. Enter the desired speed (numeric entry range is 0 to 100%)

i. Press "Enter"

Disabling Protection Features

Except for overvoltage protection, the power supply's protection features may be disabled. This is not recommended

as a normal operating condition but is helpful under some circumstances such as troubleshooting. The turn-on default

is "NO-PROTECT OFF" (protection enabled) so this procedure must be performed, as needed, every time the line

voltage is turned on. To disable the protection:

a. Simultaneously depress the "0" and "9" keys. EEINIT <model> will be displayed.

b. Using the Up/Down annunciator keys select NO-PROTECT <OFF>.

c. Using the Up/Down arrows select NO-PROTECT <ON>.

d. Press "Enter"

Troubleshooting - 3

Post-repair Calibration

Calibration is required annually and whenever certain components are replaced. If components in any of the circuits

listed below are replaced, the supply must be re-calibrated as described in Appendix B of the User's Guide.

a. A1 Control Board: Voltage or Current Monitor Amplifier circuits, High Bandwidth Current Amplifier, or

Current Monitor resistors R403/R473

b. A2 Interface Board

If the Interface board A2 is replaced, the supply must be initialized first (see "Initialization" later in this chapter) and

then be calibrated.

Inhibit Calibration Switch

If "CAL DENIED" appears on the display when calibration is attempted, or if error code 401 occurs when

calibrating over the GPIB, the internal INHIBIT CAL switch has been set. This switch setting prevents unauthorized

or inadvertent power supply calibration. You must reset this switch in order to calibrate the supply.

This four-section switch, S201, is located on the A2 Interface board near the GPIB connector. The switch has 2

functions related to calibration. One is Inhibit Calibration. With this switch set the supply will not respond to

calibration commands, thus providing security against unauthorized calibration. The other switch allows you to

bypass the password in case it is forgotten.

Switch 3 Switch 4

Normal Off Off

Clear

Password

Off On

Inhibit

Calibration

On Off

Calibration Password

In order to enter the calibration mode, you must use the correct password as described in Appendix B of the

Operating Manual. As shipped from the factory, the number 0 (zero) is the password. If you use an incorrect

password, "OUT OF RANGE" will appear on the display for front panel calibration (or error code 402 occurs for

GPIB calibration) and the calibration mode will not be enabled.

If you have changed the password and have forgotten it, you can set the configuration switch on A2 Interface board

to bypass the password. See "Calibration Switch" paragraph above.

S201

4 3 2 1

3 - Troubleshooting

Initialization

The dc power supply's GPIB address and model number as well as other constants which are required to program

and calibrate the supply are stored in a EEPROM on the A2 Interface board. The Interface board also contains

references and other components that will affect the alignment of the supply. If the Interface board is replaced, the

supply must be reinitialized and calibrated. To initialize the power supply:

a. Enable the Calibration mode

b. Simultaneously depress the "0" and "9” keys.

c. Using the Up/Down arrows select the appropriate model number

d. Press "Enter"

The dc power supply will go through the turn-on self test sequence. It is now re-initialized and must be calibrated.

See Appendix A of the User’s Guide for the calibration procedure.

ROM Upgrade

Identifying the Firmware

You can use the *IDN? query to identify the revision of the supply's firmware. The query will readback the

revisions of the Primary Interface ROM located on the A2 Interface board. The manufacturer and model number of

the supply are also returned. The following is a sample program:

10 ALLOCATE L$[52]

20 OUTPUT 705;"*IDN?"

30 ENTER 705;L$

40 DISP L$

50 END

The computer will display the manufacturer's name, the model number, a "0," and then the firmware revision.

Example: "AGILENT TECHNOLOGIES,66332A,0,A.00.01". The revision level of the ROM can also be found on

the label affixed to the physical IC chip itself.

Upgrade Procedure

If the Interface board ROM is upgraded you can re-initialize the supply without affecting the calibration.

a. Enable the Calibration mode.

b. Simultaneously depress the "0" and "9" keys. EEINIT <model> will be displayed.

c. Using the Up/Down annunciator keys select ROMUPD <model>.

d. Using the Up/Down arrows select the appropriate model number.

e. Press "Enter".

The supply will go through the turn-on self test sequence and return to the power supply metering mode.

Troubleshooting - 3

Disassembly Procedures

The following paragraphs provide instructions on how to disassemble various components of the dc power supply.

Once disassembled, the components can be reassembled by performing the disassembly instructions in reverse

order. Figure 3-2 shows the location of the major components of the unit.

Figure 3-2. Component Location

WARNING: SHOCK HAZARD. To avoid the possibility of personal injury, turn off AC power and

disconnect the line cord before removing the top cover. Disconnect the GPIB cable and any loads,

and remote sense leads before attempting disassembly.

CAUTION: Most of the attaching hardware is metric. Use of other types of fasteners will damage threaded

inserts. Refer to the list of required tools when performing disassembly and replacement.

List of Required Tools

a. 2PT Pozidriv screwdrivers.

b. T10 and T15 Torx screwdrivers.

c. Hex drivers: 7 mm for GPIB connector,

3/16" for RS-232 connector,

1/4" for front panel binding posts

d. Long nose pliers.

e. Antistatic wrist discharge strap.

3 - Troubleshooting

Cover, Removal and Replacement

a. Using a 2TP Pozi screwdriver, unscrew the two screws that hold the carrying straps to the power supply, and

then remove the two screws from the opposite side of the case.

b. To remove the cover, first spread the bottom rear of the cover slightly and push from the front panel

c. Slide the cover backward until it clears the rear of the power supply.

A2 Interface Board, Removal and Replacement

To remove the Interface Board, proceed as follows:

a. Remove the cover of the power supply as described under, "Cover Removal and Replacement."

b. Remove the two 7 mm and 3/16 inch hex screws that hold the GPIB and RS-232 connectors in place.

c. Unplug the cable from J206. Depress the release button located at the end of the connector where the wires enter

the housing.

d. Unplug the flat cables. Note the position of the conductive side for reinstallation. Connectors release the cable

by pulling out end tabs as shown by the arrows in the following figure.

e. Lift the board off of the snap-in standoffs.

f. To reinstall the Interface board, perform the above steps in reverse order.

Front Panel Assembly, Removal and Replacement

This procedure removes the front panel assembly from the dc power supply.

a. Remove the Power Supply Cover as described earlier in, "Top Cover Removal and Replacement."

b. Disconnect the cable between the Front Panel board and the Interface board at the Interface board.

c. Carefully peel off the vinyl trim strips on each side of the front panel that cover the front panel screws.

d. Using a Torx T10 driver remove the two screws (one on each side) that hold the front panel assembly to the

chassis.

e. Slide the Front Panel assembly forward and away from the chassis to access the S1 power switch.

f. Disconnect the wires going to the S1 switch assembly. For reassembly, make a note of the color coding of the

wires and the pins to which they are connected.

g . If the supply has front panel binding posts, unplug the cable from the binding post connector and use a Torx T15

driver to remove the screw connecting the ground wire to the chassis.

f. You can now remove the front panel assembly from the supply.

g. To reinstall the Front Panel Assembly, perform the above steps in reverse order.

Troubleshooting - 3

S1 Line Switch, Removal and Replacement

a. First remove the front panel assembly as described under “Front Panel Assembly, Removal and Replacement.”

b. Release the switch from the front panel by pressing the locking tabs inward against the body of the switch and

pushing the switch out of its opening.

NOTE: When reinstalling the switch, make sure that the letter “O” is facing up when the switch is installed

in its opening.

A3 Front Panel Board, Removal and Replacement

First remove the front panel assembly as described under, "Front Panel Assembly, Removal and Replacement."

Once you have access to the front panel board perform these steps:

a. Remove the RPG knob by pulling it away from the front panel.

b. Use a Torx T10 driver to remove the screw that secures the board to the front panel assembly.

c. Slide the board to the left to disengage the holding clips, then lift it out.

d. To reinstall the Front Panel board, perform the above steps in reverse order.

A1 Main Control Board

a. Remove the top cover and the A2 Interface board as previously described.

b. Disconnect all cables going to connectors on the main control board.

NOTE: Be sure to note the position and orientation of all cables prior to removal so that no mistake is

made later when reinstalling these cables.

c. If your power supply is equipped with a relay option board, remove the Torx T10 screw that holds the relay

board bracket.

d. Remove four Torx T15 screws that secure the main control board to the chassis.

e. Slide the main board towards the front panel to release it from chassis mounted standoffs and then lift the board

out of the chassis.

T1 Power Transformer, Removal and Replacement

To remove the power transformer, the front panel assembly must first be removed to gain access to the bracket

screws that hold the transformer in place.

a. Remove the three Torx T10 screws securing the rear of the transformer bracket to the bottom of the chassis and

the two Torx T10 screws securing the front of the transformer to the chassis.

b. Use long nose pliers to disconnect all wires going to the transformer terminals.

c. Lift the transformer out of the chassis.

NOTE: The AC power connections at the transformer primary are line voltage dependent. Refer to Figure

3-3 subsequent reconnection.

3 - Troubleshooting

Line Voltage Wiring

Figure 3-3 illustrates the primary wiring configuration of the power transformer for various ac line voltages. Use

long nose pliers to disconnect the wires going to the transformer terminals.

NOTE: Install the correct fuse when changing the ac line voltage from a previous setting:

for 110/120 Vac: 4 AM, Agilent p/n 2110-0055;

for 220/230 Vac: 2 AM, Agilent p/n 2110-0002

grey

white/red/grey

jumper

grey

white/red/grey

jumper

grey

white/red/grey

jumper

grey

white/red/grey

jumper

spare

yellow

blue

white/red

white/blue

white

white/grey

grey

orange

white/green

Figure 3-3. Transformer Wiring

Principles of Operation

Introduction

This section describes the different functional circuits used in the dc power supply models covered in this manual.

First, the I/O external signals that connect to the Agilent power supply are described. Next, the overall block

diagrams for the dc power supply are described in detail.

The simplified block diagrams in this section show the major circuits on the dc power supply as well as the signals

between circuits. They also show the reference designations of some of the components in the functional circuit.

These same reference designators are shown in the schematic diagrams in Section 6.

I/O Interface Signals

Table 4-1 describes the interface signals between the power supply and the end user (or other external circuits and

devices).

Table 4-1. Power Supply Interface signals

Connector Signal Description

Front panel outputs +OUT

-OUT

Positive DC output voltage

Negative DC voltage (or return)

Rear panel

output/sense screw

terminals

+OUT

-OUT

+ sense

- sense

common

Positive DC output voltage

Negative DC voltage (or return)

+OUT sensing terminal

-OUT sensing terminal

connected to ground conductor

INH/FLT connector

pin 1

pin 2

pin 3

pin 4

FLT/INH mode1Digital I/O mode

FLT output OUT 0

FLT Common OUT 1

INH Input IN 2/OUT 2

INH Common Common

1as-shipped configuration

RS-232 connector XON-XOFF

RTS-CTS

DTR-DSR

NONE

uses ASCII control codes DC# and DC1

uses Request-To-Send and Clear-To-Send lines

uses Data-Terminal-Ready and Data-Set-Ready lines

there is no flow control

GPIB connector GPIB/IEEE 488 Provides the interface to an external GPIB controller

Ac input connector ac mains Can be 100 Vac, 120 Vac, 220 Vac or 240 Vac Input

4 - Principles of Operation

A3 Front Panel Circuits

As shown in Figure 4-1, the supply's front panel assembly contains a circuit board, a keypad, a liquid crystal display

(LCD), and a rotary control (RPG) for the output voltage and current. With the exception of the RPG (A3G1), the

A3 Front Panel board is an assembly-level replaceable part. A separate front panel binding post board is also

included on the unit. It is also available as an assembly-level replaceable part.

The A3 front panel board contains microprocessor circuits, which decode and execute all keypad and RPG

commands that are transferred to the power supply output via the serial I/O port to the primary interface circuits on

the A2 interface board. The front panel microprocessor circuits also process power supply measurement and status

data received on the serial I/O port. This data is displayed on the LCD.

A2 Interface Circuits

The circuits on the A2 interface board provide the interface between the GPIB interface, RS-232 interface, and front

panel interface and the dc power supply. Communication between the power supply and a GPIB controller is

processed by the GPIB interface and the primary microprocessor circuits on the A2 board. The A2 Interface board is

assembly-level replaceable; it contains no user-replaceable parts.

With the exception of the front panel microprocessor, all digital circuits, analog-to-digital converters (ADC) and

digital-to-analog converters (DAC) in the dc power supply are located on the A2 Interface board. All control signals

between the A2 interface board and the A1 main board are either analog or level signals.

Primary Interface

The primary microprocessor circuits (DSP, ROM, and RAM chips) decode and execute all instructions and control

all data transfers between the controller and the secondary interface. The primary microprocessor circuits also

processes measurement and status data received from the secondary interface.

A Dual Asynchronous Control chip on the A2 board converts the RS-232, RI/DFI, and front panel data into the

primary microprocessor's 8-bit data format. The serial data is transferred between the primary interface and the

secondary interface via a serial bus and optical isolator chips. These chips isolate the primary interface circuits

(referenced to earth ground) from the secondary interface circuits.

Secondary Interface

The secondary interface circuits include a programmed logic array, EEPROM, boot-ROM, 8 and 12-bit DAC

circuits, and 8 and 16-bit ADC circuits. The programmed logic array translates the serial data received from the

primary interface into a corresponding digital signal for the appropriate DAC/ADC circuits. The logic array is also

connected directly to four DAC/ADC circuits. Under control of the logic array, the selected DAC converts the data

on the bus into an analog signal. Conversely, the selected ADC converts the analog signals from the A1 board into a

digital signal.

The logic array also directly receives status information from the A1 main board via three level-sensitive signal lines,

which inform the array of the following operating conditions: constant voltage mode (CV_Detect*), constant current

mode (CC_Detect*), negative current mode (CCN_Detect*), and overvoltage (OV_Detect*). The PM_Inhibit

control signal is used to shut down the bias voltage to the output stages and keep the power supply output off. The

OV_SCR* control signal is used to fire the SCR and keep the power supply output off when an overvoltage

condition has occurred.

Principles of Operation - 4

Figure 4-1. A2/A3 Block Diagram

4 - Principles of Operation

The EEPROM (electrically erasable programmable read-only memory) chip on the A2 interface board stores a

variety of data and configuration information. This information includes calibration constants, GPIB address,

present programming language, and model-dependent data, such as the minimum and maximum values of voltage

and current. One of the EEPROM storage locations holds a checksum value which is used to verify the integrity of

the EEPROM data. Access to the calibration data in the EEPROM is controlled by the combination of a password

and switch settings on A2S201, located on A2 interface board (See Chapter 3 "Inhibit Calibration Switch").

The Dual 12-bit DAC converts the programmed value of voltage and current on the bus into the CV_Prog and

CC_Prog signals, which are sent to the CV control circuits in order to control the magnitude of the output voltage in

the CV mode and output current in CC mode. The CV_Prog and CC_Prog signals are in the 0 to -5 V range, which

corresponds to the zero to full-scale output ratings of the dc power supply.

The Quad 8-bit DAC converts programmed information for the following circuits into analog format: negative offset

trim (OS_Trim_Neg), overvoltage setting (OV_Prog), current measurement range select (Range_Select), and fan

speed programming (Fan_Prog). The OS_Trim_Neg signal allows the negative current control circuit to be

calibrated at zero. The OV_Prog signal is applied to the OV detect circuit, which compares the programmed

overvoltage setting with the actual output voltage. The Range_Select signal selects either the high or the low (20mA)

measurement range. The Fan_Prog signal is applied to the fan speed control circuit in order to speed up the fan as

temperature increases, and to slow the fan speed down as temperature decreases.

The 16-bit ADC in conjunction with a 4x1 multiplexer returns data from the following measurement signals to the

logic array: monitored output voltage (VMon), monitored high-range current (Imon_H), monitored low-range current

(Imon_L), and monitored peak current (Imon_P). All measurement signals are in the range of 0 to +5V, which

corresponds to the zero to full-scale readback capability of the dc power supply.

The 8-channel, 8-bit ADC returns the following signals to the logic array: high-range output current (Imon_H), high

range negative current (Imon_H-), overvoltage (V_Mon), ambient temperature (Temp_Amb), heatsink temperature

(HS_Therm), and output fuse state (Fuse). Five of these signals are for fan control. The logic array varies the

Fan_Prog signal depending upon the ambient temperature, the heatsink temperature, and the present output voltage

and current. The Fuse signal informs the logic array if the output fuse (F300) is open.

A1 Main Board Circuits

Power Circuits

As shown in Figure 4-2, the power circuits consist of: input power rectifiers and filter, current-monitoring resistors,

an output stage, a voltage gain stage, an overvoltage SCR, and an output filter.

The ac input rectifier and filter converts ac input to a dc level. The output stage regulates this dc level at the output

of the power supply. The output stage has up to four parallel NPN transistors mounted on a heatsink and connected

between the +Rail and the +Output. These transistors are driven to conduct by a positive-going signal from driver

Q303 (located in the voltage gain stage). The output stage also has up to four parallel PNP transistors mounted on a

heatsink and connected between the +Rail and the -Rail. These transistors are driven to conduct by a negative-going

signal from driver Q304 (located in the voltage gain stage).

The voltage gain stage is controlled by a signal from the control circuits. A positive-going signal to the voltage gain

stage makes the output more positive. A negative-going signal to the voltage gain stage makes the output more

negative. The Turn-on control signal to the voltage gain stage simply keeps the output of the unit turned off for about

100 milliseconds at power turn-on while the microprocessor is initializing the unit.

Principles of Operation - 4

Figure 4-2. A1 Block Diagram

4 - Principles of Operation

Two current shunt resistors monitor the output current. RmHi (R473) monitors the high current range; RmLo (R403)

monitors the low current range. Shunt clamps, connected in parallel across RmLo, turn on at approximately 25 mA to

limit the voltage drop at high currents. The Range_Select signal sets the level at which switching occurs. The output

of the current monitor drives the level.

The SCR, connected across the output, will fire and short the output when an overvoltage condition is detected. The

SCR is controlled by the OV_SCR* signal from the crowbar control circuit (described in the next section).

The output filter capacitor provides additional filtering of the dc output.

Control Circuits

As shown in Figure 4-2, the control circuits consist of the CV/CC controls, output voltage/current monitor, bias

supplies, and SCR control.

The CV/CC control circuits provide a CV control loop, a positive CC control loop, and a negative CC control loop.

For any value of load resistance, the supply must act either as a constant voltage (CV) or as a constant current (CC)

supply. Transfer between these modes is accomplished automatically by the CV/CC control circuit at a value of load

resistance equal to the ratio of the programmed voltage value to the programmed current value. The negative CC

control circuit is activated when a current source such as another power supply is connected across the output

terminals and its voltage is greater than the programmed voltage. A low level CV_Detect*, CC_Detect*, or

CCN_Detect* signal is returned to the secondary interface to indicate that the corresponding mode is in effect.

When the CV loop is in control, diode D328 is conducting current. Voltage regulation is accomplished by comparing

the programmed voltage signal CV_Prog with the output voltage monitor signal Vmon. The Vmon signal is in the 0

to +5 V range, which corresponds to the zero to full-scale output voltage range of the supply. If the output voltage

exceeds the programmed voltage, Vmon goes high and produces a more negative-going CV signal, which reduces

the input to the voltage gain stage and lowers the output voltage. Conversely, if the output voltage is less than the

programmed voltage, Vmon goes low and produces a more positive-going CV signal, which increases the input to

the voltage gain stage and raises the output voltage. Depending upon the position of the sense switch, the output

voltage is either monitored at the supply's output terminals (local), or at the load (remote) using the +S and -S

terminals with remote sense leads connected to the load. If the output voltage goes higher than the programmed

value, the unit starts sinking current to reduce the output voltage.

When the CC loop is in control, diode D325 is conducting current. Current regulation is accomplished by comparing

the programmed current signal CC_Prog with the output current monitor signal Imon_H. The Imon_H signal is

produced by measuring the voltage drop across the current monitoring resistor and is in the 0 to +5 V range, which

corresponds to the zero to full-scale output current range of the supply. If the output current exceeds the

programmed current, Imon_H goes high and produces a more negative going CC signal, which reduces the input to

the voltage gain stage and lowers the output current. Conversely, if the output current is less than the programmed

current, Imon_H goes low and produces a more positive-going CC signal, which increases the input to the voltage

gain stage and raises the output current.

When the supply is sinking current, only the CV control circuit or the CCN control circuit can be active. In this case,

the supply is acting as a load instead of a power source and will attempt to pull the output voltage down by drawing

off current from the externally applied source. The current that will be drawn from the externally supplied source is

determined by the CC_Prog signal. When the current required to reduce the voltage is less than the programmed

current value, the CV control circuit is active and regulates the output voltage. When the current required to reduce

the voltage exceeds the programmed current value, the CCN control circuit is active. It regulates the output current

by comparing the negative Imon_H signal to the inverted CC_Prog signal.

During operation, a PM_Inhibit signal will cause the turn-on control to turn off the bias to the voltage gain stage and

shut down the output if any of the following occur:

Principles of Operation - 4

The output is programmed off.

An overvoltage condition is detected (OV_Detect* signal is received).

The line voltage falls below 90 volts (approximately).

Current readback is provided by three separate circuits. The previously discussed high range current signal (Imon_H)

returns the high range current measurement. When the unit is operating in the low current readback mode, a separate

low range current shunt and amplifier provides low-current readback via the Imon_L signal. The Range_Select signal

drives shunt clamps Q304 and Q305, which clamp the voltage across RmLo to approximately 1.8 V. A third current

readback circuit is available on the Agilent 66332A unit. It consists of a high bandwidth current amplifier that

returns dynamic current measurements from the output filter capacitor via the Imon_P signal. Note that the Imon_H

and the Imon_P signal are combined to return the actual output current measurement.

An overvoltage detect circuit compares the output voltage to the programmed overvoltage setting. When the output

exceeds the programmed setting, the OV_Detect* signal goes low, which informs the logic array that an OV

condition has occurred. The crowbar control circuit is enabled when the OV_SCR* signal is received. When an

overvoltage condition occurs, the SCR control circuit generates the OV signal, which causes the following actions to

occur:

1. The SCR fires, shorting the supply's output.

2. The microprocessor circuits are notified of the OV condition (OV_Detect* is low) in order to program the

output off, turn off the gain stage bias, and update the status of the unit.

3. When a output protection clear command is executed, the microprocessor circuits resets the OV circuits,

turns on the gain stage bias, and programs the output to its previous level.

The fan driver control circuit provides the DC voltage to operate the cooling fan. The Fan_Prog signal from the

secondary interface circuit varies this voltage according to the ambient and heatsink temperature as well as the output

voltage and current of the supply.

Replaceable Parts List

Introduction

This section lists the replaceable parts for Agilent Models 66332A, 6632B, 6633B, and 6634B

power supplies. Refer to Figures 5-1 for the location of mechanical parts with the reference

designators MP. Refer to the board location diagrams in Chapter 6 for the location of electrical

parts.

Table 5-1. Chassis, Electrical

Designator Model Part_Number Qty Description

A1 66332A/6632B 5063-3431 1 Control PCA, Tested

A1 6633B 06633-61023 1 Control PCA, Tested

A1 6634B 06634-61023 1 Control PCA, Tested

A2 66332A 5063-3439 1 Interface PCA, Tested

A2 6632B/6633B/6634B 5063-3429 1 Interface PCA, Tested

A3 All 5063-3432 1 Front Panel PCA, Tested

A4 6633B/6634B 5063-3406 1 Binding Post PCA

A4 66332A/6632B 06611-60022 1 Binding Post PCA

A5 All 5063-3433 1 AC Input/RFI PCA

A6 All 5063-3434 1 Relay PCA, Tested

B1 All 06632-60002 1 Fan Assembly

T1 66332A/6632B 9100-5501 1 Main Transformer

T1 6633B 9100-5567 1 Main Transformer

T1 6634B 9100-5568 1 Main Transformer

S1 All 3101-2862 1 Rocker Switch (AC Line)

W1 All 06612-80001 1 Cable (A5 to S1)

W2 All 06612-80002 1 Cable (S1 to T1)

W3 All 06632-80004 1 Cable (T1 to A1J303)

W4 All 06612-80008 1 Cable (T1 to A1 J304/J305)

W5 All 06612-80003 1 T1 Jumper

W6 All 5080-2452 1 Cable (A1 to A2 J206)

W7 All 5080-2448 1 Cable (A1 to A2 J207)

W10 All 5080-2457 1 Cable (A2 J210 to A6 J610)

W11 All 5080-2457 1 Cable (A2 J211 to A3 J111)

W15 All 06612-80010 1 Cable (A1 J314 to A4 J615)

All 8120-4383 1 Line Cord, Standard (Option 903)

All 8120-1350 1 Line Cord, Option 900

All 8120-1369 1 Line Cord, Option 901

All 8120-1689 1 Line Cord, Option 902

All 8120-0698 1 Line Cord, Option 904

All 8120-2104 1 Line Cord, Option 906

All 8120-2956 1 Line Cord, Option 912

All 8120-4211 1 Line Cord, Option 917

All 8120-4753 1 Line Cord, Option 918

5 - Replaceable Parts

Table 5-2. Chassis, Mechanical

Designator Model Part Number Qty Description

MP1 All 06612-00002 1 Chassis

MP2 All 5063-3426 1 Front Panel Assy, Std unit

MP2 All 5063-3443 1 Front Panel Assy, Option 020

MP3 All 0370-3238 1 Knob, 6mm

MP4 All 06612-40001 1 Keypad

MP5 All 1510-0091 2 Binding Post, Single, Red

MP6 66332A 66332-80001 1 Nameplate (66332A)

MP6 6632B 06632-80019 1 Nameplate (6632B)

MP6 6633B 06633-80002 1 Nameplate (6633B)

MP6 6634B 06634-80002 1 Nameplate (6634B)

MP7 All 5001-9847 1 Top Cover

MP8 All 5041-8819 1 Strap Handle Cap, front

MP9 All 5041-8820 1 Strap Handle Cap, rear

MP10 All 5062-3702 1 Strap Handle

MP11 All 06624-20007 1 Barrier Block Cover

MP12 All 1252-1488 1 Terminal Block, 4 Position, RI/DFI

MP13 All 06611-40006 1 Fan Spacer (G10)

MP14 All 5020-2859 1 Main Heat Sink

MP15 All 06612-20002 1 Thermal Insulator

MP16 All 0515-0433 15 Screw M4x0.7x8mm, Torx T15, Pan, Conical washer

MP17 All 1400-1826 8 Spring Clip

MP18 All 06612-20001 4 Insulator

MP19 All 06612-80004 1 Rear Label

MP20 All 5041-8801 4 Foot

MP21 All 0515-1117 2 Screw M5x0.8x10mm, Pozi, Flat, Patch Lock

MP22 All 0515-1132 2 Screw M5x0.8x10mm Pozi, Pan, Patch Lock

MP23 All 06612-00005 1 Relay Option Bracket

MP24 All 06612-00004 1 Binding Post Plate

MP25 All 2950-0144 2 Nut, Hex 3/8-32 Nylon

MP26 All 0590-0305 2 Nut, Hex w/Lockwasher 6-32

MP27 All 5001-0538 2 Side Trim

MP28 All 0380-0644 2 Stud Mounted Standoff

MP29 All 2190-0034 2 Washer, Helical Lock #10

MP30 All 3050-0849 2 Washer, Flat #10

MP31 All 5001-6788 1 Transformer Bracket

MP32 All 5001-6787 1 Transformer Shim

MP33 All 1400-1281 2 Cable Clip

MP34 All 0515-0380 10 Screw M4x0.7x10mm, Torx T15, Pan, conical washer

MP35 All 0515-1946 1 Screw M3x0.5x6mm, Torx T10, Flat, Patch Lock

MP36 All 0515-2535 4 Screw, M3x0.5x8mm, Torx T10, Thread Rolling

MP37 All 0515-0374 6 Screw M3x0.5x10mm, Torx T10, Pan, conical washer

MP38 All 0535-0031 2 Nut, Hex w/lockwasher, M3x0.5

MP39 All 0460-2362 1 Foam Pad

MP40 All 0380-2086 2 Standoff, snap-in

MP41 All 8160-0916 2 RFI Clip

MP42 All 1252-3056 2 Screw Lock Kit (ref RS232 Connector)

All 5962-0872 1 Operating Guide

All 5962-8108 1 Programming Guide

Replaceable Parts - 5

Figure 5-1. Mechanical Parts ldentification

5 - Replaceable Parts

Table 5-3. A1 Control Board PC Board Assembly

Designator Model Part Number Qty Description

A1 66332A/6632B 5063-3431 1 Control PCA, Tested

A1 6633B 06633-61023 1 Control PCA, Tested

A1 6634B 06634-61023 1 Control PCA, Tested

C300 66332A/6632B 0160-5422 1 Cap 0.047 uF 20%

C301 All 0160-5422 1 Cap 0.047 uF 20%

C303 66332A/6632B 0180-4756 1 Cap 18,000 uF 50V

C303 6633B 0180-4815 1 Cap 2200 uF 160V

C303 6634B 0180-4816 1 Cap 1200 uF 250V

C304 66332A/6632B 0160-5422 1 Cap 0.047 uF 20%

C305 All 0180-2980 1 Cap 1000 uF 50V

C306 All 0180-4033 1 Cap 2200 uF 35 V

C307 66332A/6632B 0160-5422 1 Cap 0.047 uF 20%

C308, 309 All 0160-5422 2 Cap 0.047 uF 20%

C310 All 0180-4818 1 Cap 8200 uF 16V

C311, 312 All 0160-5422 2 Cap 0.047 uF 20%

C313 66332A/6632B 0180-4819 1 Cap 33,000 uF 25V

C313 6633B 0180-4817 1 Cap 18,000 uF 16V

C313 6634B 0180-4818 1 Cap 8200 uF 16V

C314 66332A/6632B 0160-5422 1 Cap 0.047 uF 20%

C315, 316 66332A/6632B 0160-5422 2 Cap 0.047 uF 20%

C317 All 0160-5422 1 Cap 0.047 uF 20%

C318, 319 All 0180-4129 2 Cap 1 uF 35V

C320 All 0180-4136 1 Cap 10 uF 20V

C321 All 0180-4129 1 Cap 1 uF 35V

C322 All 0160-5422 1 Cap 0.047 uF 20%

C323 All 0160-4831 1 Cap 4700 pF 10%

C324 All 0180-4129 1 Cap 1 uF 35V

C325 - 327 All 0160-5422 3 Cap 0.047 uF 20%

C328 All 0160-5098 1 Cap 0.22 uF 10%

C330 All 0160-4832 1 Cap 0.01 uF 10%

C331, 332 66332A/6632B 0160-4830 2 Cap 2200 pF 10%

C333 66332A/6632B 0160-5644 1 Cap 0.033 uF 10%

C334 66332A/6632B 0160-5422 1 Cap 0.047 uF 20%

C334 6633B/6634B 0160-4835 1 Cap 0.1 uF 10% 50V

C335 66332A/6632B 0160-7001 1 Cap 3300 pF 100V

C335 6633B 0160-5410 1 Cap 3300 pF

C335 6634B 0160-4834 1 Cap 0.047 uF 10%

C336 All 0160-4812 1 Cap 220 pF 5%

C337 - 339 All 0160-5422 3 Cap 0.047 uF 20%

C340 6634B 0160-6836 1 Cap 0.01 uF 250V

C341 - 343 All 0160-5422 3 Cap 0.047 uF 20%

C344 66332A/6632B 0160-5422 1 Cap 0.047 uF 20%

C344 6633B/6634B 0160-4833 1 Cap 0.022 uF

C345 All Not loaded

C346 66332A/6632B 0160-5422 1 Cap 0.047 uF 20%

C346 6633B/6634B 0160-4833 1 Cap 0.022 uF

C347 All 0160-6827 1 Cap 0.022 uF 400V

C348 All 0160-5422 1 Cap 0.047 uF 20%

Replaceable Parts - 5

Designator Model Part Number Qty Description

C349 66332A/6632B 0160-4791 1 Cap 10 pF 5% 100V

C349 6633B/6634B 0160-4807 1 Cap 0.033 uF

C350 All 0160-5422 1 Cap 0.047 uF 20%

C351 All 0160-4791 1 Cap 10 pF 5% 100V

C352 66332A/6632B 0160-4791 1 Cap 10 pF 5% 100V

C352 6633B/6634B 0160-4807 1 Cap 0.033 uF

C353, 354 All 0160-5422 2 Cap 0.047 uF 20%

C355 66332A/6632B 0160-5422 1 Cap 0.047 uF 20%

C355 6633B/6634B 0160-4835 1 Cap 0.1 uF 10% 50V

C356 All Not loaded

C357 All 0160-4801 1 Cap 100 pF 5%

C358 All 0160-4791 1 Cap 10 pF 5% 100V

C359 66332A/6632B 0160-4791 1 Cap 10 pF 5% 100V

C359 6633B/6634B 0160-4787 1 Cap 22 pF 5% 100V

C360 66332A/6632B 0160-4791 1 Cap 10 pF 5% 100V

C360 6633B 0160-4789 1 Cap 15 pF 5% 100V

C360 6634B 0160-4791 1 Cap 10 pF 5% 100V

C361 66332A/6632B 0160-4807 1 Cap 33 pF 5% 100V

C362 66332A/6632B 0160-4813 1 Cap 180 pF 5%

C362 6633B 0160-4812 1 Cap 220 pF 5% 100V

C362 6634B 0160-4800 1 Cap 120 pF 5%

C363 All 0160-4807 1 Cap 33 pF 5% 100V

C364 All 0160-5422 1 Cap 0.047 uF 20%

C365 All 0160-5471 1 Cap 0.1 uF 5% 50V

C366, 367 All 0160-4791 2 Cap 10 pF 5% 100V

C368 All 0160-4789 1 Cap 15 pF 5% 100V

C369 All 0160-6827 1 Cap 0.022 uF 400V

C370 All 0160-5422 1 Cap 0.047 uF 20%

C371 All 0160-4812 1 Cap 220 pF 5%

C372, 373 66332A/6632B 0160-5422 2 Cap 0.047 uF 20%

C374 All 0160-5422 1 Cap 0.047 uF 20%

C375 66332A/6632B/6633B 0160-5410 1 Cap 3300 pF 5%

C375 6634B 0160-5422 1 Cap 0.047 uF 20%

C376 66332A/6632B 0160-5422 1 Cap 0.047 uF 20%

C376 6633B 0160-4918 1 Cap 0.022 uF 20%

C376 6634B 0160-6616 1 Cap 6800 pF 20%

C377 66332A/6632B 0160-5422 1 Cap 0.047 uF 20%

C377 6633B 0160-4918 1 Cap 0.022 uF 20%

C377 6634B 0160-6616 1 Cap 6800 pF 20%

C378 66332A/6632B 0160-5422 1 Cap 0.047 uF 20%

C379 All 0160-8153 1 Cap 4700 pF

C380 All 0180-4129 1 Cap 1 uF 35V

C381 All 0160-8153 1 Cap 4700 pF

C382 66332A/6632B 0160-8231 1 Cap-MET 100 uF

C382 6633B 0160-8299 1 Cap 50 uF 70V

C382 6634B 0160-8230 1 Cap 22 uF 150V

C383 66332A/6632B 0160-5469 1 Cap 1 uF 10% 50V

C384 All 0160-4789 1 Cap 15 pF 5% 100V

C386 All 0160-4787 1 Cap 22 pF 5% 100V

5 - Replaceable Parts

Designator Model Part Number Qty Description

C403 66332A/6632B 0160-4791 1 Cap 10 pF 5% 100V

C405 All 0160-3454 1 Cap 220 pF 1KV

C411 6633B/6634B 0160-7277 1 Cap 2.2 uF

C420 6633B/6634B 0160-6800 1 Cap 0.022 uF 20%

C421 6633B/6634B 0160-6800 1 Cap 0.022 uF 20%

C422 6633B 0160-6180 1 Cap 1000 pF 20%

C422 6634B 0160-7336 1 Cap 220 pF 20%

C423 6633B 0160-6804 1 Cap 0.047 uF 20%

C423 6634B 0160-7568 1 Cap 0.0047 uF 10%

C424 6633B 0160-6180 1 Cap 1000 pF 20%

C424 6634B 0160-7336 1 Cap 220 pF 20%

C425 6633B/6634B 0160-4822 1 Cap 1000 pF

C426 6634B 0160-6806 1 Cap 0.1 uF

C427 6634B 0160-0157 1 Cap 4700 pF

C428 - 430 6633B/6634B 0160-6803 3 Cap 0.047 uF 250v 20%

C431, 432 6633B 0160-5847 2 Cap 0.22 uF

C480, 481 All 0160-5422 2 Cap 0.047 uF 20%

C482 6633B/6634B 0160-6800 1 Cap 0.022 uF 20%

C496, 497 All 0180-4129 2 Cap 1 uF 35V

C498 All 0160-4801 1 Cap 100 pF 5%

C499 66332A/6632B 0160-7562 1 Cap 6.8 uF 63 V

CR342 66332A/6632B 5060-3234 1 SCR/Rectifier Assembly (CR342/D330)

1205-0571 1 ref CR342 Heat Sink

1884-0310 1 ref CR342 SCR MCR69-3

1901-0987 1 ref CR342 Power Diode D330

CR342 6633B 5060-3234 1 SCR/Rectifier Assembly (CR342/D330)

1205-0571 1 ref CR342 Heat Sink

1884-0310 1 ref CR342 SCR MCR69-3

1901-0987 1 ref CR342 Power Diode D330

CR342 6634B 5060-3251 1 SCR/Heatsink Assembly

1884-0316 1 ref CR342 SCR 2N6402

1205-0571 1 ref CR342 Heat Sink

D300 - 303 All 1901-0731 4 Diode

D304 All 1901-1098 1 Diode

D305, 306 All 1901-0731 2 Diode

D307 All 1901-1098 1 Diode

D308 66332A/6632B 5060-3378 1 Rectifier Assembly

1901-1383 1 ref D308 Power Diode

1205-0282 1 ref D308 Heat Sink

D308 6633B/6634B 1901-1130 1 Diode

D309 66332A/6632B 5060-3228 1 Rectifier Assembly

1901-0987 1 ref D309 Rectifier

1205-0282 1 ref D309 Heat Sink

D309 6633B/6634B 1901-1130 1 Diode

D310 66332A/6632B 5060-3228 1 Rectifier Assembly

1901-0987 1 ref D310 Rectifier

1205-0282 1 ref D310 Heat Sink

Replaceable Parts - 5

Designator Model Part Number Qty Description

D310 6633B/6634B 1901-1130 1 Diode

D311 66332A/6632B 5060-3378 2 Rectifier Assembly

1205-0282 1 ref D311 Heat Sink

1901-1383 1 ref D311 Power Diode

D311 6633B/6634B 1901-1130 1 Diode

D312 All 1901-1098 1 Diode

D313, 314 All 1901-0731 2 Diode

D315 All 1901-0050 1 Diode

D316 All 1901-0719 1 Power Diode

D317 66332A/6632B 1901-1080 1 Diode

D317 6633B/6634B 1901-1098 1 Diode

D318 66332A/6632B 1901-1080 1 Diode

D318 6633B/6634B 1901-1098 1 Diode

D319 - 321 6633B/6634B 1901-1098 3 Diode

D322 All 1901-0050 1 Diode

D323, 324 All 1901-0033 2 Diode

D325 All 1901-0050 1 Diode

D326 All 1901-0033 1 Diode

D327, 328 All 1901-0050 2 Diode

D329 All 1901-0033 1 Diode

D330 66332A/6632B/6633B 1901-0987 1 Power Diode (See CR342)

D335 66332A/6632B 1902-0953 1 Zener Diode 6.2V 5%

D336, 337 All 1901-0880 2 Diode

D400 6634B 1901-0719 1 Diode, Power

D470, 471 All 1902-0960 2 Zener Diode 12V 5%

D499 66332A/6632B/6633B 1901-0987 1 Power Diode (See Q314)

F300, 301 All 2110-0712 2 Fuse, Submin 4AM, 125V

F302 66332A/6632B/6633B 2110-0697 1 Fuse, Submin 15AM, 32V

F302 6634B 2110-0685 1 Fuse, Submin 7AM, 125V

F303 66332A/6632B/6633B 2110-0697 1 Fuse, Submin 15AM, 32V

F303 6634B 2110-0685 1 Fuse, Submin 7AM, 125V

F304 All 2110-0699 1 Fuse, Submin 5AM, 125V

F305 66332A/6632B/6633B 2110-0777 1 Fuse 8AM 32V

F305 6634B 0811-3776 1 Res Fusible 0.5 Ohm 5W

All 2110-1107 2 ref F305 Fuseholder Clips

F400, 406 66332A/6632B Not Used 2 Replaced by track on all models

F401-405, 407 All Not Used 6 Replaced by track on all models

J303 All 1252-0063 1 Connector

J304 All 1251-6832 1 Connector

J305 All 1252-0063 1 Connector

J307 All 1252-5977 1 Connector

J309 All 0360-2609 1 Barrier Block

J314 All 1252-0056 1 Connector

J414 All 1252-0063 1 Connector

J508 All 1252-3771 1 AC Line Module

L300, 301 66332A/6632B 9140-0115 2 Coil 22 uH 10%

5 - Replaceable Parts

Designator Model Part Number Qty Description

Q300 All 5060-3245 1 Darlington Fan Driver Assembly

All 1854-0828 1 ref Q300 Transistor,NPN SI

All 1205-0282 1 ref Q300 Heat Sink

Q301 66332A/6632B/6633B 1854-0474 1 Transistor, NPN

Q301 6634B 1854-0575 1 Transistor, NPN

Q302 66332A/6632B/6633B 1854-0474 1 Transistor, NPN

Q302 6634B 1854-0575 1 Transistor, NPN

Q303 66332A/6632B 06612-60008 1 Transistor Driver Assembly

1854-0872 1 ref Q303 Transistor, NPN

1205-0350 1 ref Q303 Heat Sink

Q303 6633B 06633-60009 1 Assembly, Transistor/Heat Sink

1854-0920 1 ref Q303 Transistor, NPN

1205-0571 1 ref Q303 Heat Sink

Q303 6634B 06634-60009 1 Transistor/HS Assembly

1205-0571 1 ref Q303 Heat Sink

1854-0838 1 ref Q303 Transistor, NPN

Q304 66332A/6632B 06612-60009 1 Transistor Driver Assembly

1205-0350 1 ref Q304 Heat Sink

1853-0497 1 ref Q304 Transistor, PNP

Q304 6633B 5063-3451 1 Assembly, Transistor/Heat Sink

1853-0652 1 ref Q304 Transistor PNP Q304

1205-0571 1 ref Q304 Heat Sink

Q304 6634B 5063-3451 1 Transistor/HS Assembly

1853-0652 1 ref Q304 Transistor PNP Q304

1205-0571 1 ref Q304 Heat Sink

Q305 All 1858-0054 1 Transistor Array

Q306 All 1853-0336 1 Transistor, PNP

Q307 All 1853-0086 1 Transistor, PNP

Q308 66332A/6632B 1854-1174 1 Transistor, NPN

Q308 6633B/6634B 1854-1362 1 Transistor, NPN

Q309 66332A/6632B 1854-1174 1 Transistor, NPN

Q309 6633B/6634B 1854-1362 1 Transistor, NPN

Q310 66332A/6632B 1853-0656 1 Transistor, PNP

Q310 6633B/6634B 1853-0772 1 Transistor, PNP

Q311 66332A/6632B 1853-0656 1 Transistor, PNP

Q311 6633B/6634B 1853-0772 1 Transistor, PNP

Q312 66332A/6632B 1854-1174 1 Transistor, NPN

Q313 All 06612-60006 1 FET Assembly

All 1855-0831 1 ref Q313 MOSFET N-Chan

All 1205-0350 1 ref Q313 Heat Sink

Q314 All 06612-60005 1 FET/Diode Assembly

All 0590-0199 1 ref Q314 Hex Nut w/ Lockwasher

All 1855-0726 1 ref Q314 MOSFET P-Chan

All 1205-0350 1 ref Q314 Heat Sink

All 0340-0950 1 ref Q314 Insulator

All 2200-0143 1 ref Q314 Mach Screw 4-40

All 1901-0987 1 ref Q314 Diode (D499)

Replaceable Parts - 5

Designator Model Part Number Qty Description

Q315 66332A/6632B 1854-1174 1 Transistor, NPN

Q315 6633B/6634B 1854-1362 1 Transistor, NPN

Q316 All 1855-1016 1 Transistor, FET

Q317 66332A/6632B 1853-0656 1 Transistor, PNP

Q317 6633B/6634B 1853-0772 1 Transistor, PNP

Q318 All 1858-0074 1 Transistor Array

Q319 66332A/6632B 1853-0656 1 Transistor, PNP

R300 66332A/6632B/6633B 0698-3642 1 Res 3K 5% 2W MO

R300 6634B 0764-0046 1 Res 33K 5% 2W MO

R301 66332A/6632B 0757-0403 1 Res 121 Ohm 1% 0.125W

R301 6633B 0757-0416 1 Res 511 1% 0.125W

R301 6634B 0757-0283 1 Res 2k 1% 0.125W

R302 66332A/6632B 0757-0403 1 Res 121 Ohm 1% 0.125W

R302 6633B 0757-0416 1 Res 511 1% 0.125W

R302 6634B 0757-0283 1 Res 2k 1% 0.125W

R303 All 0757-0280 1 Res 1K 1% 0.125W

R304 All 0698-3279 1 Res 4.99K 1%

R305 All 0698-4202 1 Res 8.87K 1%

R306 All 0757-0280 1 Res 1K 1% 0.125W

R307 - 309 All 0757-0442 3 Res 10K 1% 0.125W

R310 All 0698-3156 1 Res 14.7K 1%

R311 All 0686-2225 1 Res 2.2K 5% 0.5W

R312 All 0698-0092 1 Res 2.61K 1%

R313 66332A/6632B 0683-0475 1 Res 4.7 Ohm 5% 0.25W

R313 6633B/6634B 0757-0346 1 Res 10 1%

R314 All 0757-0442 1 Res 10K 1% 0.125W

R315 All 8159-0005 1 Jumper

R316 All 0757-0401 1 Res 100 Ohm 1% 0.125W

R317, 318 All 8159-0005 2 Jumper

R319 66332A/6632B 0698-3444 1 Res 316 Ohm 1% 0.125W

R319 6633B 0757-0416 1 Res 511 1%

R319 6634B 0757-0420 1 Res 750 1%

R320 66332A/6632B 0757-0427 1 Res 1.5K 1% 0.125W

R320 6633B 0698-0085 1 Res 2.61k 1%

R320 6634B 0757-0280 1 Res 1k 1%

R321 66332A/6632B 0698-4509 1 Res 80.6K 1%

R321 6633B 0698-3454 1 Res 215k 1%

R321 6634B 0698-4536 1 Res 340k 1%

R322 All 0757-0280 1 Res 1K 1% 0.125W

R323 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W

R323 6633B 0757-0438 1 Res 5.11K 1%

R323 6634B 0698-3156 1 Res 14.7K 1%

R324 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W

R324 6633B/6634B 0757-0438 1 Res 5.11K 1%

R325 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W

R325 6633B 0698-3156 1 Res 14.7K 1%

R325 6634B 0757-0438 1 Res 5.11K 1%

5 - Replaceable Parts

Designator Model Part Number Qty Description

R326 66332A/6632B 0757-0200 1 Res 5.62K 1%

R326 6633B/6634B 0698-3159 1 Res 26.1K 1%

R327 All 0757-0280 1 Res 1K 1% 0.125W

R328 66332A/6632B 0683-0475 1 Res 20K 1% 0.125W

R328 6633B/6634B 0757-0346 1 Res 10 1%

R329 66332A/6632B 0757-0449 1 Res 4.7 Ohm 5% 0.25W

R329 6633B 0757-0453 1 Res 30.1K 1%

R329 6634B 0757-0458 1 Res 51.1K 1%

R330 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W

R330 6633B/6634B 0698-3156 1 Res 14.7K 1%

R331 All 0757-0280 1 Res 1K 1% 0.125W

R332 All 0757-0199 1 Res 21.5K 1%

R333 66332A/6632B 0757-0438 1 Res 5.11K 1%

R333 6633B/6634B 0757-0441 1 Res 8.25K 1%

R334 66332A/6632B 8159-0005 1 Jumper

R335 All 0757-0438 1 Res 5.11K 1%

R336 All 0757-0280 1 Res 1K 1% 0.125W

R337 66332A/6632B/6633B 0698-3444 1 Res 316 Ohm 1% 0.125W

R337 6634B 0757-0420 1 Res 750 1% 0.125W

R339 66332A/6632B 0757-0442 1 Res 10K 1% 0.125W

R339 6633B 0757-0458 1 Res 51.1k 1% 0.125W

R339 6634B 0698-3454 1 Res 215K 1% 0.125W

R340 66332A/6632B 0757-0407 1 Res 200 Ohm 1% 0.125W

R340 6633B 0757-0414 1 Res 432 1% 0.125W

R340 6634B 0757-0280 1 Res 1K 1% 0.125W

R341 66332A/6632B 0698-3441 1 Res 215 Ohm 1%

R341 6633B 0757-0414 1 Res 432 1% 0.125W

R341 6634B 0757-0280 1 Res 1K 1% 0.125W

R342 66332A/6632B 0698-4509 1 Res 80.6K 1%

R342 6633B 0698-3456 1 Res 287K 1% 0.125W

R342 6634B 0698-3260 1 Res 464K 1% 0.125W

R343 66332A/6632B 0698-3441 1 Res 215 Ohm 1%

R343 6633B 0757-0414 1 Res 432 1% 0.125W

R343 6634B 0757-0280 1 Res 1K 1% 0.125W

R344 All 0757-0442 1 Res 10K 1% 0.125W

R345 All 0757-0280 1 Res 1K 1% 0.125W

R346 All 0757-0442 1 Res 10K 1% 0.125W

R347 All 0757-0458 1 Res 51.1K 1%

R348 66332A/6632B 0698-3444 1 Res 316 Ohm 1% 0.125W

R348 6633B 0698-4187 1 Res 632 1%

R348 6634B 0757-0427 1 Res 1.5K 1%

R349 66332A/6632B 0698-3159 1 Res 26.1K 1%

R349 6633B 0698-4509 1 Res 80.6K 1%

R349 6634B 0757-0468 1 Res 130K 1%

R350 66332A/6632B 0757-0279 1 Res 3.16K 1%

R350 6633B 0757-0435 1 Res 3.92K 1%

R350 6634B 0757-0279 1 Res 3.16K 1%

Replaceable Parts - 5

Designator Model Part Number Qty Description

R351 66332A/6632B 0698-6320 1 Res 5K 0.1%

R351 6633B 0698-5087 1 Res 6.2K 1%

R351 6634B 0698-6320 1 Res 5K 1%

R352 66332A/6632B 8159-0005 1 Jumper

R353 All 0698-8959 1 Res 619K 1%

R354 66332A/6632B 0757-0447 1 Res 16.2K 1%

R354 6633B 0757-0458 1 Res 51.1K 1%

R354 6634B 0698-4509 1 Res 80.6K 1%

R355 All 0698-0084 1 Res 2.15K 1%

R356 66332A/6632B 0757-0472 1 Res 200K 1%

R356 6633B 0757-0270 1 Res 249K 1%

R356 6634B 0757-0472 1 Res 200K 1%

R357 66332A/6632B 0699-2246 1 Res 25K 0.05%

R357 6633B/6634B 0699-1510 1 Res 22.22K 0.05%

R358 All Not loaded

R359 66332A/6632B 8159-0005 1 Jumper

R360, 361 All 0699-2246 2 Res 25K 0.05%

R362 66332A/6632B 0698-8807 1 Res 39K 0.1%

R362 6633B/6634B 0699-1513 1 Res 40K 0.05%

R363 All 0757-0473 1 Res 221K 1%

R364 66332A/6632B 0699-2246 1 Res 25K 0.05%

R364 6633B/6634B 0699-1510 1 Res 22.22K 0.05%

R365, 366 All 0698-6392 2 Res 22K 0.1% 0.125W

R367 All 0757-0436 1 Res 4.32K 1%

R370 All 0757-0442 1 Res 10K 1% 0.125W

R371 66332A/6632B 0699-0934 1 Res 35.65K 0.1%

R371 6633B/6634B 0699-2246 1 Res 25K 0.05%

R372 66332A/6632B 0699-0236 1 Res 2.5K 0.1% 0.1W

R372 6633B/6634B 0699-1867 1 Res 3.2K 0.1% 0.1W

R373 66332A/6632B 0757-0401 1 Res 100 Ohm 1% 0.125W

R374 All 0757-0458 1 Res 51.1K 1%

R375 All Not loaded

R376 66332A/6632B 0699-0934 1 Res 35.65K 0.1%

R376 6633B/6634B 0699-2246 1 Res 25K 0.05%

R377 66332A/6632B 0698-8807 1 Res 39K 0.1%

R377 6633B/6634B 0699-1513 1 Res 40K 0.05%

R378 66332A/6632B 0698-3634 1 Res 470 Ohm 5% 2W

R378 6633B/6634B 0698-3642 1 Res 3K 5% 2W MO

R379 All 0757-0436 1 Res 4.32K 1%

R380 All 0757-0401 1 Res 100 Ohm 1% 0.125W

R381 All 0698-8959 1 Res 619K 1% 0.125W

R382 All 0757-0401 1 Res 100 Ohm 1% 0.125W

R383 All 0698-3460 1 Res 422K 1%

R384 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R384 6633B 0811-2553 1 Res 7.5 Ohm 5% 2W PW

R385 66332A/6632B 0699-0236 1 Res 2.5K 0.1% 0.1W

R385 6633B/6634B 0699-1867 1 Res 3.2K 1% 0.125W

5 - Replaceable Parts

Designator Model Part Number Qty Description

R386 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R386 6633B/6634B 0811-2553 1 Res 7.5 Ohm 5% 2W PW

R387 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R387 6633B/6634B 0811-2553 1 Res 7.5 Ohm 5% 2W PW

R388 All 0757-0442 1 Res 10K 1% 0.125W

R389 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R389 6633B 0811-2553 1 Res 7.5 Ohm 5% 2W PW

R390, 391 All 0698-8834 2 Res 9K 0.1% 0.125W

R392 66332A/6632B 0698-6320 1 Res 5K 0.1%

R392 6633B/6634B 0698-6348 1 Res 3K 0.1% 0.125W

R393 66332A/6632B/6633B 0698-6360 1 Res 10K 0.1%

R393 6634B 0698-8865 1 Res 4.45K 0.1% 0.1W

R394 66332A/6632B 0698-6358 1 Res 100K 0.1%

R394 6633B 0698-6376 1 Res 200K 0.1% 0.1W

R394 6634B 0698-7841 1 Res 164K 0.1% 0.1W

R395, 396 All 0699-1866 2 Res 2.7K 0.1%

R397 6634B 0698-3642 1 Res 3K 2W

R398 All 0757-0442 1 Res 10K 1% 0.125W

R399 All 0698-6533 1 Res 12.5K 0.1%

R400, 401 All 0757-0442 2 Res 10K 1% 0.125W

R402 All 0757-0438 1 Res 5.11K 1%

R403 All 0699-4484 1 Res 72 Ohm

R404 66332A/6632B 0757-0442 1 Res 10K 1% 0.125W

R405 All 0698-8827 1 Res 1M 1% 0.125W

R406 All 0698-3456 1 Res 287K 1%

R407 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R407 6633B 0811-2553 1 Res 7.5 Ohm 5% 2W PW

R408 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R408 6633B/6634B 0811-2553 1 Res 7.5 Ohm 5% 2W PW

R409 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R409 6633B/6634B 0811-2553 1 Res 7.5 Ohm 5% 2W PW

R410 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R410 6633B 0811-2553 1 Res 7.5 5% 2W PW

R411 66332A/6632B/6633B 8159-0005 1 Jumper

R412 66332A/6632B/6633B 0698-3454 1 Res 215K 1%

R412 6634B 0698-3459 1 Res 383K 1%

R413 66332A/6632B 0757-0442 1 Res 10K 1% 0.125W

R414 All 0699-0088 1 Res 1.2M 1%

R415 66332A/6632B 0698-6392 1 Res 22K 0.1% 0.125W

R415 6633B/6634B 0699-1510 1 Res 22.22K 0.1%.125W

R416 All 0686-7515 1 Res 750 Ohm 5% 0.5W

R417 All 0757-0442 1 Res 10K 1% 0.125W

R418 66332A/6632B 0757-0458 1 Res 51.1K 1%

R418 6633B 0698-3201 1 Res 80K 1%

R418 6634B 0698-5092 1 Res 160K 1%

R419 All 0757-0442 1 Res 10K 1% 0.125W

R420 All 0699-1972 1 Res 1.74M 0.1% 0.125W

Replaceable Parts - 5

Designator Model Part Number Qty Description

R421 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R421 6633B 0811-2553 1 Res 7.5 Ohm 5% 2W PW

R422 66332A/6632B 0698-6351 1 Res 133K 0.1%

R423 66332A/6632B/6633B 0699-0267 1 Res 10K 0.05%

R423 6634B 0699-0278 1 Res 15K 0.05% 0.1W

R425 66332A/6632B 0698-4539 1 Res 402K 1%

R427 66332A/6632B 0757-0442 1 Res 10K 1% 0.125W

R427 6633B/6634B 8159-0005 1 Jumper

R428 6634B 0698-3642 1 Res 3K

R429 66332A/6632B/6633B 0699-0267 1 Res 10K 0.05%

R429 6634B 0699-0278 1 Res 15K 0.05% 0.1W

R430 66332A/6632B 0757-0272 1 Res 52.3K 1%

R431 All 0757-0438 1 Res 5.11K 1%

R432 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W

R432 6633B 0698-0084 1 Res 2.15K 1%

R432 6634B 0757-0438 1 Res 5.11K 1%

R433 66332A/6632B 0698-4099 1 Res 139 Ohm 1% 0.125W

R434 66332A/6632B 8159-0005 1 Jumper

R435 All 8159-0005 1 Jumper

R436, 437 66332A/6632B 0811-1672 2 Res 3.3 Ohm 5% 2W

R438 All 8159-0005 1 Jumper

R439 66332A/6632B 0698-6317 1 Res 500 Ohm 0.1%

R440 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R440 6633B/6634B 0811-2553 1 Res 7.5 5% 2W PW

R441 All 0698-4486 1 Res 24.9K 1%

R442 66332A/6632B 0699-1513 1 Res 40K 0.05%

R442 6633B 0699-3416 1 Res 100K 0.05% 0.1W

R442 6634B 0699-3448 1 Res 300K 0.05% 0.1W

R443 66332A/6632B 0699-1513 1 Res 40K 0.05%

R443 6633B 0699-3416 1 Res 100K 0.05% 0.1W

R443 6634B 0699-3448 1 Res 300K 0.05% 0.1W

R444 All 0757-0438 1 Res 5.11K 1%

R445 66332A/6632B 0811-0929 1 Res 0.51 Ohm 5% 2W

R445 6633B 0812-0019 1 Res 0.33 5% 2W PW

R445 6634B 0811-1220 1 Res 1.5 5% 2W PW

R446 66332A/6632B 0698-6631 1 Res 2.5K 0.1%

R446 6633B 0698-8863 1 Res 5.2K 0.1%

R446 6634B 0699-0489 1 Res 16.1K 0.1%

R447 66332A/6632B 0698-4123 1 Res 499 Ohm 1% 0.125W

R448 All 8159-0005 1 Jumper

R449 66332A/6632B 8159-0005 1 Jumper

R450 66332A/6632B 0698-8812 1 Res 1 Ohm 1% 0.125W

R451 All 8159-0005 1 Jumper

R452 66332A/6632B 0757-0280 1 Res 1K 1% 0.125W

R452 6633B 0698-0084 1 Res 2.15K 1%

R452 6634B 0757-0438 1 Res 5.11K 1%

R453 66332A/6632B 0698-6360 1 Res 10K 0.1%

R454 All 8159-0005 1 Jumper

5 - Replaceable Parts

Designator Model Part Number Qty Description

R455 66332A/6632B 0698-6631 1 Res 2.5K 0.1%

R455 6633B 0698-8863 1 Res 5.2K 0.1%

R455 6634B 0699-0489 1 Res 16.1K 0.1%

R456 All 8159-0005 1 Jumper

R457 66332A/6632B 8159-0005 1 Jumper

R458 All 8159-0005 1 Jumper

R459 66332A/6632B 8159-0005 1 Jumper

R460 All 0698-6620 1 Res 150K 0.1%

R461 All 0757-0395 1 Res 56.2 Ohm 1%

R462 66332A/6632B/6633B 0757-0416 1 Res 511 Ohm 1% 0.125W

R462 6634B 0757-0394 1 Res 51.1 Ohm 1% 0.125W

R463 6634B 0698-3642 1 Res 3K 2W

R464, 465 All 0698-0084 2 Res 2.15K 1%

R466 66332A/6632B 0698-8812 1 Res 1 Ohm 1% 0.125W

R466 6633B 0683-0475 1 Res 4.7 Ohm

R466 6634B 0757-0379 1 Res 12.1 Ohm

R467, 468 66332A/6632B 0811-1672 2 Res 3.3 Ohm 5% 2W

R469 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R469 6633B 0811-2553 1 Res 7.5 Ohm 5% 2W PW

R470 66332A/6632B 0811-1672 1 Res 3.3 Ohm 5% 2W

R470 6633B/6634B 0811-2553 1 Res 7.5 Ohm 5% 2W PW

R471 66332A/6632B 0699-1797 1 Res 10M 5% 0.25W

R471 6633B/6634B 0683-1065 1 Res 10M

R472 All 0757-0442 1 Res 10K 1% 0.125W

R473 66332A/6632B 0811-3770 1 Res 0.05 Ohm 1%

R473 6633B 0811-3771 1 Res 0.25 Ohm 1%

R473 6634B 0811-3772 1 Res 0.5 Ohm 1%

R474 All 8159-0005 1 Jumper

R476 All 0757-0281 1 Res 2.74K 1%

R477 All 0757-0199 1 Res 21.5K 1%

R478, 479 All 0698-4444 2 Res 4.87K 1%

R480, 481 All 0757-0269 2 Res 270 Ohm 1% 0.125W

R482 All 0698-3226 1 Res 6.49K 1%

R483 All 0698-5089 1 Res 33K 1% 0.125W

R488 66332A/6632B 0698-3922 1 Res 487K 0.1%

R488 6633B 0699-1744 1 Res 280K 0.1%

R488 6634B 0699-0070 1 Res 3.16M 1%

R489 66332A/6632B 0698-3922 1 Res 487K 0.1%

R489 6633B 0698-6950 1 Res 1.25M 0.1% 0.5W

R489 6634B 0699-0070 1 Res 3.16M 1%

R490 66332A/6632B 0699-0730 1 Res 1M 0.1%

R490 6633B 0699-0070 1 Res 3.16M 1%

R490 6634B 0683-6855 1 Res 6.8M 5%

R493 All 0757-0438 1 Res 5.11K 1%

R494, 495 All 0698-8812 2 Res 1 Ohm 1% 0.125W

R496 66332A/6632B 0757-0289 1 Res 13.3K 1%

R496 6633B/6634B 0757-0433 1 Res 3.32K 0.125W

Replaceable Parts - 5

Designator Model Part Number Qty Description

R497 66332A/6632B 0757-0289 1 Res 13.3K 1%

R497 6633B/6634B 0757-0433 1 Res 3.32K 0.125W

R498 - 500 All 0757-0407 2 Res 200 Ohm 1% 0.125W

R505 6633B Not Used 1

R510 - 517 66332A/6632B 0811-1672 8 Res 3.3 Ohm 5% 2W

R520 6633B/6634B Not Used 1

R521 All Not Used 1 Replaced by wire in 6633B/6634B units

R522 All Not Used 1

RT301 All 0837-0397 1 Thermistor

S300 All 3101-2927 1 Switch, Right Angle Slide

T300 66332A/6632B 9100-4350 1 Current Transformer

T300 6633B/6634B 8159-0005 1 Jumper

U300 All 5060-3229 1 -15V Regulator Assembly

All 1826-0214 1 ref U300 Integrated Circuit

All 1205-0282 1 ref U300 Heat Sink

U301 All 5063-2389 1 +5V Regulator Assembly (Interface Bias)

All 1826-1597 1 ref U301 Integrated Circuit

All 1205-0402 1 ref U301 Heat Sink

U302 All 5060-2948 1 +5V Regulator Assembly (Secondary Bias)

All 1205-0282 1 ref U302 Heat Sink

All 1826-0122 1 ref U302 Integrated Circuit

U303 All 1826-1533 1 Integrated Circuit

U304 All 5060-3232 1 +15V Regulator Assembly

All 1826-0106 1 ref U304 Integrated Circuit

All 1205-0282 1 ref U304 Heat Sink

U305 All 1826-0346 1 Integrated Circuit

U306 All 1826-1370 1 Integrated Circuit

U308 All 1826-1534 1 Integrated Circuit

U309 All 1826-3521 1 Integrated Circuit

U310 All 1826-2252 1 Integrated Circuit

U311 All 1826-3521 1 Integrated Circuit

U313 All 1826-1878 1 Integrated Circuit

U314 66332A/6632B 1826-3521 1 Integrated Circuit

U315 All 1826-1878 1 Integrated Circuit

U400 All 1826-0643 1 Integrated Circuit

VR300 All 1902-0955 1 Integrated Circuit

VR301 All 1902-0957 1 Zener Diode 9.1V 5%

VR302 6634B 1902-3092 1 Zener Diode 4.99V 5%

VR303 66332A/6632B 1902-0953 1 Zener Diode 6.2V 5%

VR303 6633B/6634B 1902-0958 1 Zener Diode 10V 5%

VR304 66332A/6632B 1902-0943 1 Zener Diode 2.4V 5%

VR304 6633B/6634B 1902-0947 1 Zener Diode 3.6V 5%

VR305 66332A/6632B 1902-0943 1 Zener Diode 2.4V 5%

VR305 6633B/6634B 1902-0947 1 Zener Diode 3.6V 5%

VR335 66332A/6632B 1902-0953 1 Zener Diode 6.2V 5%

VR335 6633B/6634B 1902-0957 1 Zener Diode 9.1V 5%

W300, 301 All 8159-0005 2 Jumper

5 - Replaceable Parts

A2 Interface PCA, Tested for 66332A 5063-3439 No user replaceable parts

A2 Interface PCA, Tested for 6632B/6633B/6634B 5063-3429 No user replaceable parts

A3 Front Panel PCA Tested for all models 5063-3432 No user replaceable parts

Table 5-4. Binding Post Option #020

Designator Model Part Number Qty Description

A4 6633B/6634B 5063-3406 1 Binding Post PCA

A4 66332A/6632B 06611-60022 1 Binding Post PCA

C603, 604 All 0160-8153 2 Cap 4700 pF

J615 All 1252-0056 1 4 Pin Connector

MP5 All 1510-0091 2 Binding Post, Single, Red

MP26 All 0590-0305 2 Nut, Hex 6-32 w/Lockwasher

MP25 All 2950-0144 2 Nut, Hex 3/8-32 Nylon

MP24 All 06612-00004 1 Binding Post Plate

W15 All 06612-80010 1 Cable (A1 J314 to A4 J615)

Table 5-5. A5 AC input/RFI Board

Designator Model Part Number Qty Description

A5 All 5063-3433 1 AC Input/RFI PCA

C500 All 0160-4259 1 Cap 0.22 uF 10%

C501, 502 All 0160-8181 2 Cap 0.0022 uF

F500 All 2110-0055 1 Fuse 4AM, 250V (100Vac and 120Vac input)

F500 All 2110-0002 1 Fuse 2AM, 250V (220Vac and 230Vac input)

J508 All 1252-3771 1 AC Line Module

XF500 All 2110-0927 1 Fuseholder, with cap

Table 5-6. Relay Option #760

Designator Model Part Number Qty Description

A6 All 5063-3434 1 Relay PCA, Tested

C600 All 0160-5422 1 Cap 0.047 uF 20%

C601, 602 All 0150-0081 2 Cap 0.01 uF

F601, 602 All 2110-0671 2 Fuse 0.125AM, 125V

J610 All 1252-7643 1 Connector

K601 - 603 All 0490-1405 3 Relay, 2C 12VDC

K604, 605 All 0490-1670 2 Power Relay

R601, 602 All 0686-2215 2 Res 220 Ohm 5% 0.5W

R603 All 0698-3439 1 Res 178 Ohm 1% 0.125W

R604 All 0757-0284 1 Res 150 Ohm 1% 0.125W

R605 All 0698-3439 1 Res 178 Ohm 1% 0.125W

R606 All 0757-0284 1 Res 150 Ohm 1% 0.125W

R607 All 0698-3439 1 Res 178 Ohm 1% 0.125W

U601 All 1858-0047 1 Transistor Array

W10 All 5080-2457 1 Cable (A2 J210 to A6 J610)

Diagrams

Introduction

This chapter contains drawings and diagrams for troubleshooting and maintaining the Agilent Model 66332A

Dynamic Measurement DC Source and the Agilent Model 66332A/6632B/6633B/6634B System DC Power

Supplies. Unless otherwise specified in the drawings, a drawing or diagram applies to all models and input voltage

options.

General Schematic Notes

a Components marked with an asterisk are model dependent (See Table 6-1).

a All resistors are in ohms 1%, 1/8 W, unless otherwise specified.

a All capacitors are in microfarads unless otherwise specified.

a Unless otherwise noted, bias connections to integrated-circuit packages are as follows:

Common 5 V

14-pin packages pin 7 pin 14

16-pin packages pin 8 pin 16

20-pin packages pin 10 pin 20

Table 6-1. Model-dependent Components

Designator 66332A/

6632B

6633B 6634B Designator 66332A/

6632B

6633B 6634B

C300, 304, 307 0.047 uF C411 2.2 uF 2.2 uF

C302 18000 uF 2200 uF 1200 uF C420, 421 0.022 uF 0.022 uF

C313 33,000 uF 18000 uF 8200 uF C422, 424, 425 1000 pF 220 pF

C314-316 0.047 uF C423 0.047 uF 0.0047 uF

C331, 332 2200 pF C425 1000 pF 1000 pF

C333 0.033 uF C426 0.1 uF

C335 3300 pF 3300 pF 0.047 pF C427 4700 pF

C340 0.01 uF C428-430 0.047 uF 0.047 uF

C344, 346 0.047 uF 0.022 uF 0.022 uF C431, 432 0.22 uF

C349, 352 10 pF 0.033 uF 0.033 uF C482 0.022 uF 0.022 uF

C359 10 pF 22 pF 22 pF C499 6.8 uF

C360 10 pF 15 pF 10 pF D319, 320, 321 Diode Diode

C361 33 pF D330 Diode Diode

C362 180 pF 220 pF 120 pF D400 Diode

C372, 373 0.047 uF D499 Diode Diode

C375 0.047 uF F400, 406 0 Ohm

C376, 377 0.047 uF 0.022 uF 6800 pF L300, 301 22 uH

C378 0.047 uF Q312, 319 Transistor

C382 100 uF 50 uF 22 uF R300 3K 12K 33K

C383 1 uF R301, 302 121 Ohm 511 Ohm 2k

C403 10 pF R313 4.7 Ohm 10 Ohm 10 Ohm

6 - Diagrams

Table 6-1. Model-dependent Components (continued)

Designator 66332A/

6632B

6633B 6634B Designator 66332A/

6632B

6633B 6634B

R319 316 Ohm 511 Ohm 750 Ohm R413 10K

R320 1.5K 2.61k 1k R415 22K 22.22K 22.22K

R321 80.6K 215k 340k R418 51.1K 80K 160K

R323 1K 5.11K 14.7K R421 3.3 Ohm 7.5 Ohm

R324 1K 5.11K 5.11K R422 133K

R325 1K 14.7K 5.11K R423, 429 10K 10K 15K

R326 5.62K 26.1K 26.1K R425 402K

R328 20K 10 Ohm 10 Ohm R427 10K 0 Ohm 0 Ohm

R329 4.7 Ohm 30.1K 51.1K R428 3K

R330 1K 14.7K 14.7K R430 52.3K

R333 5.11K 8.25K 8.25K R432 1K 2.15K 5.11K

R334 0 Ohm R433 139 Ohm

R337 316 Ohm 316 Ohm 750 Ohm R434 0 Ohms

R339 10K 51.1k 215K R436, 437 0 Ohms

R340 200 Ohm 432 Ohm 1K R439 500 Ohm

R341, 343 215 Ohm 432 Ohm 1K R440 3.3 Ohm 7.5 Ohm 7.5 Ohm

R342 80.6K 287K 464K R442, 443 40K 100K 300K

R348 316 Ohm 632 Ohm 1.5K R445 0.51 Ohm 0.33 1.5

R349 26.1K 80.6K 130K R446 2.5K 5.2K 16.1K

R350 3.16K 3.92K 3.16K R447 499 Ohm

R351 5K 6.2K 5K R449 0 Ohm

R352 0 Ohm R450 1 Ohm

R354 16.2K 51.1K 80.6K R452 1K 2.15K 5.11K

R356 200K 249K 200K R453 10K

R357 25K 22.22K 22.22K R455 2.5K 5.2K 16.1K

R359 0 Ohm R457, 459 0 Ohm

R362 39K 40K 40K R462 511 Ohm 511 Ohm 51.1 Ohm

R364 25K 22.22K 22.22K R463 3K

R371 35.65K 25K 25K R466 1 Ohm 4.7 Ohm 12.1 Ohm

R372 2.5K 3.2K 3.2K R467, 468 0 Ohm

R373 100 Ohm R469 7.5 Ohm

R376 35.65K 25K 25K R470 7.5 Ohm 7.5 Ohm

R377 39K 40K 40K R473 0.05 Ohm 0.25 Ohm 0.5 Ohm

R378 470 Ohm 3K 3K R488 487K 280K 3.16M

R384, 389 3.3 Ohm 7.5 Ohm R489 487K 1.25M 3.16M

R385 2.5K 3.2K 3.2K R490 1M 3.16M 6.8M

R386, 387 3.3 Ohm 7.5 Ohm 7.5 Ohm R496, 497 13.3K 3.32K 3.32K

R392 5K 3K 3K R505 1.25M

R393 10K 10K 4.45K R513, 515 0 Ohm

R394 100K 200K 164K R520 0 Ohm 0 Ohm

R397 3K T300 Xfmr

R404 10K U314 IC

R407, 410 3.3 Ohm 7.5 Ohm VR302 4.99V

R408, 409 3.3 Ohm 7.5 Ohm 7.5 Ohm VR303 6.2V 10V 10V

R411 0 Ohm 0 Ohm VR304, 305 2.4V 3.6V 3.6V

R412 215K 215K 383K VR335 6.2V 9.1V 9.1V

Diagrams - 6

Table 6-2. A1 Board Component Locations

Ref. X Y Ref. X Y Ref. X Y Ref. X Y Ref. X Y

C300 8.125 3.25 C371 5.05 7.65 D323 1.025 4.9 R301 5.45 1.0 R366 1.3 3.925

C301 2.075 0.525 C372 1.875 7.9 D324 0.1 4.375 R302 6.275 0.1 R367 0.675 4.225

C302 7.5 1.925 C373 1.875 7.8 D325 0.15 7.125 R303 7.925 2.8 R368 1.125 5.0

C304 6.025 0.45 C374 0.3 8.325 D326 0.775 8.525 R304 5.85 2.1 R370 3.65 5.875

C307 5.45 0.45 C375 3.575 8.4 D327 1.0 8.025 R305 4.85 2.075 R371 2.075 5.8

C308 4.05 3.45 C376 1.2 9.875 D328 1.0 7.825 R306 5.3 1.975 R372 2.375 6.25

C309 8.025 2.8 C377 0.525 9.85 D329 0.425 8.425 R307 0.7 2.7 R373 3.175 9.275

C311 4.775 0.975 C378 1.775 10.42 D330 4.2 8.7 R308 1.15 2.8 R374 0.1 5.325

C312 4.875 1.425 C379 0.525 10.17 D331 5.15 0.8 R309 1.6 3.0 R375 0.675 4.125

C314 3.5 4.925 C380 4.675 6.975 D332 4.575 0.8 R310 1.7 3.5 R376 1.975 5.8

C315 3.825 4.7 C381 0.925 10.4 D333 5.775 0.8 R311 3.45 2.3 R377 0.55 4.475

C316 3.625 3.175 C382 3.0 10.45 D334 6.25 0.8 R312 1.4 1.75 R378 8.025 8.55

C317 1.15 2.5 C383 3.8 10.25 D336 4.65 6.4 R313 4.025 4.25 R379 0.1 4.125

C318 0.95 1.35 C384 0.3 9.35 D337 4.825 6.25 R314 0.6 3.1 R380 1.75 6.25

C319 3.525 1.475 C386 2.45 6.875 D400 3.375 7.7 R315 3.05 2.0 R381 0.55 5.625

C320 4.8 2.25 C403 1.775 8.475 D470 3.3 6.525 R316 4.825 7.025 R382 1.75 5.875

C321 3.975 1.925 C405 0.525 9.975 D471 3.65 6.175 R317 2.85 2.0 R383 1.125 5.425

C322 5.4 2.2 C411 2.825 8.3 D499 3.65 6.825 R318 2.95 2.0 R384 6.8 5.45

C323 5.4 2.0 C420 3.475 4.825 F300 1.875 0.075 R319 2.25 3.5 R385 2.275 6.25

C324 2.45 1.5 C421 3.3 4.825 F301 1.975 0.075 R320 2.15 3.4 R386 7.05 5.45

C326 0.175 2.05 C422 2.175 2.25 F302 4.725 0.425 R321 2.15 2.9 R387 5.7 5.1

C327 1.15 2.0 C423 1.7 3.2 F303 4.825 0.425 R322 1.7 3.6 R388 1.75 4.225

C328 0.475 2.7 C424 1.775 2.75 F304 0.275 2.05 R323 1.6 2.2 R389 5.95 5.1

C329 0.35 2.425 C425 0.525 6.7 F400 7.95 7.375 R324 4.75 4.85 R390 1.875 7.6

C330 1.25 2.9 C426 4.6 10.57 F401 8.05 5.425 R325 3.35 3.225 R391 1.875 7.3

C331 2.3 2.425 C427 2.1 10.47 F402 5.6 7.1 R326 4.65 5.3 R392 0.5 2.1

C332 1.925 2.7 C428 6.25 0.525 F403 5.55 4.8 R327 0.6 3.0 R393 2.225 2.0

C333 1.7 3.3 C429 5.375 0.425 F404 7.75 8.85 R328 3.475 5.025 R394 2.05 2.0

C334 1.125 4.625 C430 8.225 3.35 F405 7.95 6.275 R329 2.25 3.2 R395 2.425 7.4

C335 1.15 7.225 C431 1.75 10.47 F406 5.725 8.85 R330 4.15 3.175 R396 2.325 7.7

C336 1.05 7.65 C432 4.6 10.45 F407 5.65 5.925 R331 1.6 3.1 R397 8.275 8.55

C337 0.1 5.525 C480 3.75 6.2 F500 4.871 3.147 R332 2.25 3.0 R398 4.95 8.875

C338 0.7 7.35 C481 3.75 6.3 J303 0.15 2.75 R333 2.25 3.3 R399 0.875 8.225

C339 1.15 7.45 C482 3.2 3.75 J304 5.8 0.2 R334 4.125 4.25 R400 1.45 8.425

C340 1.5 2.35 C496 2.5 1.85 J305 1.575 0.15 R335 0.6 2.9 R401 1.45 8.225

C341 2.7 4.025 C497 3.05 1.825 J307 0.147 5.878 R336 1.6 3.2 R402 1.4 7.925

C342 1.05 5.875 C498 1.8 3.7 J309 2.075 10.63 R337 3.925 4.25 R403 2.6 8.3

C343 1.75 4.025 C499 2.875 7.95 J314 1.375 10.17 R338 1.7 2.8 R404 2.7 3.825

C344 3.75 6.4 C500 5.725 2.725 J320 2.25 9.55 R339 2.7 2.525 R405 0.425 8.325

C345 0.95 4.75 C501 6.35 3.1 J414 4.7 2.225 R340 2.675 2.1 R406 1.45 8.625

C346 3.65 6.075 C502 5.1 3.1 J508 6.35 3.45 R341 2.7 3.1 R407 5.95 6.9

C347 0.6 3.325 Cr342 3.9 8.9 L300 3.625 4.85 R342 1.7 3.0 R408 5.7 6.9

C348 1.95 5.15 D300 1.875 1.025 L301 3.5 5.2 R343 1.7 3.1 R409 7.05 7.325

C349 2.175 5.8 D301 1.975 1.025 P300 0.125 3.55 R344 1.75 4.125 R410 6.8 7.325

C350 0.1 5.425 D302 1.65 0.325 Q300 3.85 2.55 R345 0.6 3.2 R411 7.75 10.17

C351 2.4 5.65 D303 1.75 0.325 Q301 2.725 2.75 R346 2.25 3.4 R412 1.45 9.025

C352 1.95 5.65 D304 4.7 1.95 Q302 1.5 2.6 R347 0.675 5.2 R413 2.25 3.925

C353 1.875 6.25 D305 0.2 0.6 Q303 3.575 3.35 R348 2.05 2.1 R414 1.45 8.925

C354 2.375 6.35 D306 0.325 0.6 Q304 4.375 3.35 R349 2.4 9.7 R415 0.175 8.325

C355 0.55 4.575 D307 2.675 1.4 Q305 1.55 3.6 R350 1.15 7.0 R416 4.275 6.75

C356 0.3 4.25 D308 6.25 1.0 Q306 1.4 2.275 R351 1.65 8.3 R417 1.45 8.525

C357 1.925 7.05 D309 4.575 1.0 Q307 4.925 5.8 R352 1.675 2.6 R418 1.275 9.125

C358 2.25 6.775 D310 5.15 1.0 Q308 7.768 5.007 R353 0.1 4.775 R419 0.425 8.725

C359 0.775 8.125 D311 5.775 1.0 Q309 4.972 5.433 R354 1.15 7.1 R420 1.45 8.325

C360 1.35 8.125 D312 4.275 2.55 Q310 7.768 6.109 R355 2.25 3.6 R421 5.95 7.2

C361 0.65 9.95 D313 0.225 1.5 Q311 4.972 6.535 R356 0.7 7.55 R422 0.425 8.625

C362 0.775 8.025 D314 0.35 1.5 Q312 7.768 7.211 R357 0.55 4.675 R423 0.1 8.425

C363 1.975 7.5 D315 1.1 2.6 Q313 3.9 7.4 R358 0.675 4.325 R425 1.875 4.4

C364 1.875 6.9 D316 7.975 4.3 Q314 3.35 7.025 R359 3.625 4.25 R427 2.7 3.725

C365 0.7 8.9 D317 3.725 4.25 Q315 4.972 8.248 R360 1.125 4.425 R428 8.025 9.425

C366 2.275 8.0 D318 4.25 4.25 Q316 0.65 7.85 R361 1.25 3.725 R429 0.2 9.45

C367 0.175 9.0 D319 3.625 4.5 Q317 7.768 8.313 R362 1.125 4.525 R430 1.975 4.4

C368 0.2 8.425 D320 4.125 4.5 Q318 4.8 7.625 R363 1.275 4.425 R431 4.95 7.1

C369 1.35 7.65 D321 1.75 2.5 Q319 4.972 10.05 R364 1.125 5.1 R432 1.65 9.15

C370 0.075 9.55 D322 1.65 4.325 R300 8.225 0.725 R365 1.75 3.825 R433 1.925 8.75

6 - Diagrams

Table 6-2 continued

Ref. X Y Ref. X Y

R434 2.5 9.825 R500 2.175 4.325

R435 2.4 9.825 R505 0.525 6.8

R436 7.05 7.75 R510 6.2 5.1

R437 6.8 7.75 R511 6.2 7.2

R438 4.675 6.875 R512 6.55 5.45

R439 1.925 8.65 R513 6.55 7.75

R440 5.7 7.2 R514 6.2 6.9

R441 5.05 7.125 R515 6.2 9.9

R442 0.35 9.65 R516 6.55 7.325

R443 0.2 9.55 R517 6.55 9.75

R444 4.375 7.9 R520 4.15 9.75

R445 3.425 9.275 R521 2.5 6.05

R446 0.9 9.65 R522 4.25 1.75

R447 2.4 8.45 Rt301 7.4 10.43

R448 1.95 9.675 S300 4.291 10.63

R449 1.95 9.775 T300 4.35 9.925

R450 1.925 8.85 Tp318 4.825 6.05

R451 0.825 9.25 Tp319 4.975 7.63

R452 1.95 9.25 Tp320 4.975 9.475

R453 2.375 8.55 Tp321 4.825 5.15

R454 1.35 9.75 Tp323 3.825 8.825

R455 0.075 9.75 U300 3.85 1.725

R456 1.225 10.02 U301 1.275 1.625

R457 1.125 10.02 U302 3.85 2.15

R458 2.2 9.825 U303 6.275 2.3

R459 2.1 9.825 U304 2.775 1.725

R460 0.6 2.55 U305 1.05 2.4

R461 4.675 7.375 U306 0.575 7.05

R462 4.675 7.275 U308 4.6 5.675

R463 8.275 9.425 U309 2.375 5.55

R464 4.225 7.075 U310 0.475 4.9

R465 4.675 7.175 U311 2.25 6.675

R466 3.6 9.8 U313 2.15 3.825

R467 5.7 9.9 U314 2.175 8.025

R468 5.95 9.9 U315 0.575 8.875

R469 6.8 9.75 U400 0.825 5.6

R470 7.05 9.75 U498 3.925 3.45

R471 4.925 10.82 U499 3.925 3.15

R472 4.725 6.6 Vr300 4.7 1.85

R473 2.7 5.4 Vr301 4.7 2.05

R474 7.85 9.125 Vr302 4.0 5.025

R476 0.525 6.6 Vr303 1.45 8.825

R477 3.75 5.7 Vr304 0.45 4.025

R478 3.2 5.775 Vr305 1.45 8.725

R479 3.2 5.675 Vr335 1.175 4.025

R480 3.75 6.1 W300 3.625 9.45

R481 3.75 6.0 W301 4.65 7.475

R482 4.2 5.8

R483 4.2 5.9

R484 4.025 3.6

R485 3.925 3.675

R486 3.725 4.125

R487 3.825 3.675

R488 0.525 6.9

R489 0.525 6.8

R490 1.35 6.775

R493 1.2 6.675

R494 3.1 8.85

R495 3.2 8.85

R496 3.65 5.975

R497 4.275 6.5

R498 3.75 6.55

R499 3.2 6.775

Figure 6-1. A1 Board Component Locations

Figure 6-2. A4 and A6 Board Component Locations

Figure 6-3. A1 Board schematic (sheet 1)

Figure 6-3. A1 Board schematic (sheet 2)

Figure 6-3. A1 Board schematic (sheet 3)

Figure 6-4. A6 Relay Option Board schematic

Index

—+—

+OUT, 47

+sense, 47

—A—

A1 board removal, 45

A1 Main board, 50

A2 board removal, 44

A2 Interface Board, 48

A2S201, 50

A3 board removal, 45

A3 Front Panel, 48

ADC, 48

—B—

bias voltages, 38, 39

—C—

cal denied, 41

calibration, 41

calibration - post repair, 41

CC, 38

CC line regulation, 17

CC load effect, 18

CC load regulation, 17

CC loop, 52

CC noise, 19

CC- operation, 17

CC source effect, 18

CC_Detect*, 48, 52

CC_Prog, 50, 52

clear password, 41

component locations

A1, 71, 72, 73, 74

A4, 76

constant current tests, 16

constant voltage tests, 14

Control, 50, 52

copyrights, 5

cover removal, 44

current monitoring resistor, 13

current sink, 17

CV, 38

CV load effect, 14

CV loop, 52

CV Noise, 15

CV source effect, 15

CV/CC control, 50, 52

CV_Detect*, 48, 52

CV_Prog, 50, 52

—D—

DAC, 48

disable protection, 40

disassembly - tools, 43

disassembly procedure, 43

downprogramming, 50, 52

DP_Control, 50

—E—

EEPROM, 50

electronic load, 13

electrostatic discharge, 10

error codes, 37

—F—

F309, 50

fan speed, 40

Fan_Prog, 50, 52

firmware revisions, 10, 42

FLT, 47

front panel removal, 44, 45

Fuse, 50

—G—

GPIB, 47

—H—

hazardous voltages, 9

history, 5

HS_Therm, 50

—I—

identification, 5

IDN? query, 42

Imon_H, 50

IMon_H, 52

Imon_L, 50

Imon_P, 50

INH, 47

inhibit calibration, 41

initialization, 42

interface signals, 47

Index

—J—

J307 voltages, 39

—L—

line voltage wiring, 46

—M—

manual revisions, 10

—N—

notice, 5

—O—

-OUT, 47

out of range, 41

OV_Detect*, 48, 52

OV_Prog, 50

OV_SCR*, 48, 52

—P—

PARD, 15, 19

password, 41

performance test form, 19

performance tests, 13

PM_Inhibit, 52

power-on self-test, 37

primary interface, 48

printing, 5

programming, 13

protection, 40

—R—

readback accuracy, 14

reference voltages, 38, 39

replaceable parts - binding posts, 57

replaceable parts - chassis, 55

revisions, 10

RmHi, 52

RmLo, 52

ROM upgrade, 42

RPG, 48

RS-232, 47

—S—

safety considerations, 9

safety summary, 3

schematic

A1, 77, 78, 79

A4, 76

schematic notes, 71

SCR, 52

secondary interface, 48

self-test, 37

-sense, 47

sense switch, 52

serial number, 5

series regulator, 50

shunt clamp, 52

status annunciators, 38

—T—

Temp_Amb, 50

test equipment, 11

test setup, 12

trademarks, 5

transformer removal, 45

transient recovery, 16

troubleshooting - bias and reference supplies, 38, 39

troubleshooting - equipment, 24

troubleshooting - flowcharts, 24

troubleshooting - introduction, 23

troubleshooting - overall, 24

troubleshooting - status annunciators, 38

—U—

UNR, 38

—V—

verification tests, 13

VMon, 50, 52

voltage programming, 14

—W—

warranty, 2

Manual Updates

The following updates have been made to this manual since the original print date.

4/25/03

Information about serial numbers and manual revisions has been updated on pages 5 and 10.

Information has been corrected on page 16 and pages 20-22 to comply with ISO 17025.

8/15/03

Information has been corrected on page 16 and pages 20-22 to comply with ISO 17025.

10/2/03

The ripple and noise specification limits have changed for Model 6634B on page 22.

Agilent Technologies Power Supply 6632B Users Manual 66332A, 6634B Service

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