HP 6012b schematic

SERVICE MANUAL

AUTORANGING

DC POWER SUPPLY

AGILENT MODELS 6010A, 6011A,

6012B and 6015A

Agilent Part No. 5964-8275

FOR INSTRUMENTS WITH SERIAL NUMBERS

Agilent Model 6010A; Serials US37110171 and above
Agilent Model 6011A; Serials US35460156 and above
Agilent Model 6012B; Serials US35430336 and above
Agilent Model 6015A; Serials US37050146 and above

For instruments with higher serial numbers, a change page may be included.

Microfiche Part No. 5964-8276 Printed in USA: July 2001

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 Institute of
Standards and Technology, to the extent allowed by the Institute’s calibration facility, and to the calibration facilities of
other International Standards Organization members.

WARRANTY

This Agilent Technologies hardware product is warranted against defects in material and workmanship for a period of three
years from date of delivery. Agilent Technologies software and firmware products, which are designated by Agilent
Technologies for use with a hardware product and when properly installed on that hardware product, are warranted not to
fail to execute their programming instructions due to defects in material and workmanship for a period of 90 days from date
of delivery. During the warranty period Agilent Technologies will, at its option, either repair or replace products which
prove to be defective. Agilent Technologies does not warrant that the operation of the software, firmware, or hardware shall
be uninterrupted or error free.

For warranty service, with the exception of warranty options, this product must be returned to a service facility designated
by Agilent. Technologies. Customer shall prepay shipping charges by (and shall pay all duty and taxes) for products
returned to Agilent Technologies. for warranty service. Except for products returned to Customer from another country,
Agilent Technologies s hall p a y for return of products to Customer.

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

If Agilent Technologies is unable, within a reasonable time to repair or replace any product to condition as warranted, the
Customer shall be entitled to a refund of the purchase price upon return of the product to Agilent Technologies.

LIMITATION OF WARRANTY

The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by the Customer,
Customer-supplied software or interfacing, unauthorized modification or misuse, operation outside of the environmental
specifications for the product, or improper site preparation and maintenance. NO OTHER WARRANTY IS EXPRESSED
OR IMPLIED. AGILENT TECHNOLOGIES SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

EXCLUSIVE REMEDIES

THE REMEDIES PROVIDED HEREIN ARE THE CUSTOMER’S SOLE AND EXCLUSIVE REMEDIES. AGILENT
TECHNOLOGIES SHALL NOT BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES, WHETHER BASED ON CONTRACT, TORT, OR ANY OTHER LEGAL THEORY.

ASSISTANCE

The above statements apply only to the standard product warranty. Warranty options, extended support contracts, product
maintenance agreements and customer assistance agreements are also available. Contact your nearest Agilent
Technologies Sales and Service office for further information on Agilent Technologies’ full line of Support Programs.

2

SAFETY SUMMARY

The following general safety precautions must be observed during all phases of operation, service and repair of this
instrument. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety
standards of design, manufacture, and intended use of the instrument. Agilent Technologies, Inc. assumes no liability for the
customer's failure to comply with these requirements.

BEFORE APPLYING POWER.

Verify that the product is set to match the available line voltage and the correct fuse is installed.

GROUND THE INSTRUMENT.

This product is a Safety Class 1 instrument (provided with a protective earth terminal). To minimize shock hazard, the instrument chassis
and cabinet must be connected to an electrical ground. The instrument must be connected to the ac power supply mains through a three­conductor power cable, with the third wire firmly connected to an electrical ground (safety ground) at the power outlet. For instruments
designed to be hard wired to the ac power lines (supply mains), connect the protective earth terminal to a protective conductor before any
other connection is made. Any interruption of the protective (grounding) conductor or disconnection of the protective earth terminal will
cause a potential shock hazard that could result in personal injury. If the instrument is to be energized via an external autotransformer for
voltage reduction, be certain that the autotransformer common terminal is connected to the neutral (earth pole) of the ac power lines
(supply mains).

INPUT POWER MUST BE SWITCH CONNECTED.

For instruments without a built-in line switch, the input power lines must contain a switch or another adequate means for disconnecting
the instrument from the ac power lines (supply mains).

DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE.

Do not operate the instrument in the presence of flammable gases or fumes.

KEEP AWAY FROM LIVE CIRCUITS.

Operating personnel must not remove instrument covers. Component replacement and internal adjustments must be made by qualified
service personnel. Do not replace components with power cable connected. Under certain conditions, dangerous voltages may exist even
with the power cable removed. To avoid injuries, always disconnect power, discharge circuits and remove external voltage sources before
touching components.

DO NOT SERVICE OR ADJUST ALONE.

Do not attempt internal service or adjustment unless another person, capable of rendering first aid and resuscitation, is present.

DO NOT EXCEED INPUT RATINGS.

This instrument may be equipped with a line filter to reduce electromagnetic interference and must be connected to a properly grounded
receptacle to minimize electric shock hazard. Operation at the line voltage or frequencies in excess of those stated on the data plate may
cause leakage currents in excess of 5.0mA peak.

SAFETY SYMBOLS.

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 a Agilent Technologies, Inc. Sales and Service Office for service and repair to ensure that safety
features are maintained.

Instruction manual symbol: the product will be marked with this symbol when it is necessary for the user to refer to the
instruction manual (refer to Table of Contents) .

Indicates hazardous voltages.

Indicate earth (ground) terminal.

The WARNING sign denotes a hazard. It calls attention to a procedure, practice, or the like, which, if not correctly
performed or adhered to, could result in personal injury. Do not proceed beyond a WARNING sign until the indicated
conditions are fully understood and met.

The CAUTION sign denotes a hazard. It calls attention to an operating procedure, or the like, which, if not correctly
performed or adhered to, could result in damage to or destruction of part or all of the product. Do not proceed beyond
a CAUTION sign until the indicated conditions are fully understood and met.

Instruments which appear damaged or defective should be made inoperative and secured against unintended operation until they can be
repaired by qualified service personnel.

3

Safety Symbol Definitions

Symbol Description Symbol Description

Direct current Terminal for Line conductor on permanently

installed equipment

Alternating current Caution, risk of electric shock

Both direct and alternating current Caution, hot surface

Three-phase alternating current Caution (refer to accompanying documents)

Earth (ground) terminal In position of a bi-stable push control

Protective earth (ground) terminal
(Intended for connection to external
protective conductor.)

Frame or chassis terminal On (supply)

Terminal for Neutral conductor on
permanently installed equipment

Terminal is at earth potential
(Used for measurement and control
circuits designed to be operated with
one terminal at earth potential.)

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 sa me p rinting date. Revised editions are identi fied 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. Also, if the serial number prefix of your power supply is
higher than those listed on the title page of this manual, then it may or may not include a change sheet. That is because
even though the higher serial number prefix indicates a design change, the change may not affect the content of the manual.

Out position of a bi-stable push control

Off (supply)

Standby (supply)
Units with this symbol are not completely
disconnected from ac mains when t his switch is
off. To completely disconnect the unit from ac
mains, either disconnect the power cord or have
a qualified electrician install an external switch.

Edition 1 July, 2001
© Copyright 2001 Agilent Technologies, Inc.
This document contains proprietary information protected by copyright. All rights are reserved. No part of this document

may be photocopied, reproduced, or translated into another language without the prior consent of Agilent Technologies,
Inc. The information contained in t his d ocument is subject to change witho ut notice.

4

TABLE OF CONTENTS

Introduction ............................................................................................................................................................................ 7

Scope .................................................................................................................................................................................... 7

Calibration and Verification .............................................................................................................................................7

Troubleshooting................................................................................................................................................................ 7

Principles of Operation ..................................................................................................................................................... 7

Replaceable Parts.............................................................................................................................................................. 7

Circuit Diagrams............................................................................................................................................................... 7

Safety Considerations ........................................................................................................................................................... 7

Manual Revisions .................................................................................................................................................................8

Calibration and Verification.................................................................................................................................................. 9

Introduction........................................................................................................................................................................... 9

Test Equipment Required ..................................................................................................................................................... 9

Operation Verification Tests................................................................................................................................................. 9

Calibration Procedure ........................................................................................................................................................... 9

Initial Setup..................................................................................................................................................................... 12

Performance Tests .............................................................................................................................................................. 16

Measurement Techniques ............................................................................................................................................... 16

Constant Voltage (CV) Tests.......................................................................................................................................... 18

Constant Current (CC) Tests........................................................................................................................................... 24

Troubleshooting .................................................................................................................................................................... 27

Introduction......................................................................................................................................................................... 27

Initial Troubleshooting Procedures..................................................................................................................................... 27

Electrostatic Protection....................................................................................................................................................... 29

Repair and Replacement ..................................................................................................................................................... 29

A2 Control Board Removal............................................................................................................................................ 30

A4 FET Board Removal ................................................................................................................................................. 30

A5 Diode Board Removal............................................................................................................................................... 31

A3 Front Panel Board Removal...................................................................................................................................... 31

A1 Main Board Removal................................................................................................................................................ 31

Overall Troubleshooting Procedure.................................................................................................................................... 32

Using the Tables ............................................................................................................................................................. 33

Main Troubleshooting Setup .......................................................................................................................................... 33

Troubleshooting No-Output Failures.............................................................................................................................. 36

Front Panel Troubleshooting........................................................................................................................................... 36

Troubleshooting Bias Supplies ....................................................................................................................................... 38

Power Section Blocks ..................................................................................................................................................... 40

Troubleshooting AC-Turn-on Circuits............................................................................................................................ 40

Troubleshooting PWM & Clock..................................................................................................................................... 41

Troubleshooting DC-To-DC Converter.......................................................................................................................... 42

Troubleshooting Down Programmer .............................................................................................................................. 42

Troubleshooting CV Circuit ........................................................................................................................................... 44

Troubleshooting CC Circuit............................................................................................................................................44

Troubleshooting OVP Circuit......................................................................................................................................... 45

Principles of Operation ........................................................................................................................................................47

Autoranging Power............................................................................................................................................................. 47

Overview............................................................................................................................................................................. 47

System Description............................................................................................................................................................. 47

Regulation & Control Subsystem ....................................................................................................................................... 48

Protection Subsystem.......................................................................................................................................................... 53

Input Power Subsystem ......................................................................................................................................................53

5

DC Power Conversion Subsystem...................................................................................................................................... 54

Output Subsystem............................................................................................................................................................... 54

The Front Panel Board........................................................................................................................................................ 54

Replaceable Parts.................................................................................................................................................................. 57

Introduction......................................................................................................................................................................... 57

Ordering Information.......................................................................................................................................................... 58

Component Location and Circuit Diagrams ...................................................................................................................... 79

System Option 002 (6010A, 6011A, 6012B) ........................................................................................................................ 91

General Information............................................................................................................................................................ 91

Specifications.................................................................................................................................................................. 91

Option 002 Hardware...................................................................................................................................................... 91

Installation .......................................................................................................................................................................... 95

Connector Assembly Procedure...................................................................................................................................... 95

Operation ............................................................................................................................................................................ 96

Local/Remote Programming........................................................................................................................................... 97

Remote Resistance Programming................................................................................................................................... 99

Remote Monitoring....................................................................................................................................................... 101

Status Indicators............................................................................................................................................................ 102

Remote Control............................................................................................................................................................. 102

Power-On Preset ............................................................................................................................................................... 104

AC Dropout Buffer Circuit........................................................................................................................................... 105

Multiple Supply System Shutdown ..............................................................................................................................105

Bias Supplies ................................................................................................................................................................ 106

Maintenance...................................................................................................................................................................... 106

Troubleshooting............................................................................................................................................................ 107

Troubleshooting Resistance and Voltage Programming............................................................................................... 107

Troubleshooting Current Programming........................................................................................................................ 107

Backdating........................................................................................................................................................................... 119

6

1

Introduction

Scope

This manual contains information for troubleshooting the Agilent Models 6010A, 6011A, 6012B, or 6015A 1000W
Autoranging Power Supply to the component level. Wherever applicable, the service instructions given in this manual refer
to pertinent information provided in the Operation Manual. Both manuals cover Agilent Models 6010A/11A/12B/15A;
differences between models are described as required.

The following information is contained in this manual.

Calibration and Verification

Contains calibration procedures for Agilent Models 6010A/11A/12B/15A. Also contains verification procedures that check
the operation of the supplies to ensure they meet the specifications of Chapter 1 in the Operating Manual.

Troubleshooting

Contains troubleshooting procedures to isolate a malfunction to a defective component on the main circuit board or to a
defective assembly (front panel, power transformer, or cable assembly). Board and assembly level removal and replacement
procedures are also given in this section.

Principles of Operation

Provides block diagram level descriptions of the supply's circuits. The regulation and control, protection, input power, dc
power conversion and output circuits are described. These descriptions are intended as an aid in troubleshooting.

Replaceable Parts

Provides a listing of replaceable parts for all electronic components and mechanical assemblies for Agilent Models
6010A/11A/12B/15A.

Circuit Diagrams

Contains functional schematics and component location diagrams for all Agilent 6010A/11A/12B/15A circuits. The names
that appear on the functional schematics also appear on the block diagrams in Chapter 4. Thus, the descriptions in Chapter 4
can be correlated with both the block diagrams and the schematics.

Safety Considerations

This product is a Safety Class 1 instrument, which means that it is provided with a protective earth terminal. Refer to the
Safety Summary page at the beginning of this manual for a summary of general safety information. Safety information for
specific procedures is located at appropriate places in the manual.

7

Manual Revisions

Agilent Technologies instruments 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.

3648 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.

If the serial number prefix on your unit differs from that shown on the title page of this manual, a yellow Manual Change
sheet may be supplied with the manual. It defines the differences between your unit 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 version of the supply.

Older serial number formats used with these instruments had a two-part serial number, i.e. 2701A-00101. This manual also
applies to instruments with these older serial number formats. Refer to Appendix B for backdating information.

8

2

Calibration and Verification

Introduction

This section provides test and calibration procedures. The operation-verification tests comprise a short procedure to verify
that the unit is performing properly, without testing all specified parameters. After troubleshooting and repair of a defective
power supply you can usually verify proper operation with the turn-on checkout procedure in the Operating Manual.
Repairs to the A1 main board and the A2 control board can involve circuits which, although functional, may prevent the
unit from performing within specified limits. So, after A1 or A2 board repair, decide if recalibration and operation
verification tests are needed according to the faults you discover. Use the calibration procedure both to check repairs and
for regular maintenance.

When verifying the performance of this instrument as described in this chapter, check only those specifications for which a
performance test procedure is included.

Test Equipment Required

Table 2-1 lists the equipment required to perform the tests of this section. You can separately identify the equipment for
performance tests, calibration and troubleshooting using the USE column of the table.

Operation Verification Tests

To assure that the unit is performing properly, without testing all specified parameters, first perform the turn-on checkout
procedure in the Operating Manual. Then perform the following performance tests, in this section.

CV Load Effect
CC Load Effect

Calibration Procedure

Calibrate the unit twice per year and when required during repair. The following calibration procedures which follow
should be performed in the sequence given. Table 2-2 describes in detail these calibration procedures and lists the expected
results to which each adjustment must be made.

Note: Some of the calibration procedures for this instrument can be performed independently, and some

procedures must be performed together and/or in a prescribed order. If a procedure contains no references
to other procedures, you may assume that it can be performed independently.

To return a serviced unit to specifications as quickly as possible with minimal calibration, the technician
need only perform calibration procedures that affect the repaired circuit. Table 2-3 lists various power
supply circuits with calibration procedures that should be performed after those circuits are serviced.

9

Table 2-1. Test Equipment Required

TYPE REQUIRED CHARACTERISTICS USE RECOMMENDED MODEL

Oscilloscope Sensitivity: 1mV

Bandwidth: 20MHz & 100MHz
Input: differential, 50Ω & 10MΩ

Isolation Transformer 100VA 4KVA minimum T

P,T Agilent 1740A

RMS Voltmeter True rms, 10MHz bandwidth

Sensitivity: 1 mV
Accuracy: 5%

Logic Pulser 4.5 to 5.5Vdc @ 35mA T Agilent 546A

Multimeter Resolution: 100nV

Accuracy: 0.0035%, 6½ digit

CC PARD Test
Current Probe

Electronic Load* Power range: 1000 watts

No saturation at:
6010A 20Adc
6011A 100Adc
6012B 51Adc
6015A 51Adc
Bandwidth: 20Hz to 20MHz

Open and short switches
6010A

Voltage range: 200Vdc

Current range: 20Adc
6011A
Voltage range: 30Vdc

Current range: 120Adc
6012B
Voltage range: 65Vdc

Current range: 55Adc
6015A
Voltage range: 200Vdc

Current range: 5Adc

P Agilent 3400A

P,A,T Agilent 3456A

P Tektronix P6303

Probe/AM503 Amp/
TM500 Power Module

P,A Transistor Devices Model

DLP 130-50-2500
DLR-400-15-2500

DLP 50-150-3000

DLP 130-50-2500

DLR-400-15-2500

CC PARD Test
Resistive Load

10

Value:
6010A

3.5 ohms >1000W

Accuracy: 1%
6011A

0.058 ohms >1000W

Accuracy 1%
6012B

0.4 ohms >1000W

Accuracy: 1%

Rheostat or Resistor Bank

P,A

TYPE REQUIRED CHARACTERISTICS USE RECOMMENDED MODEL

Load Resistors
(6015A)

Table 2-1. Test Equipment Required (continued)

40Ω, ±1%, 1000W

P,A

250Ω, ±1%, 1000W

Current-Monitoring
Resistors

Calibration and Test
Resistors

Terminating
Resistors (4)

Blocking
Capacitors (2)

Value:
6010A

100mV @ 10A (10mΩ must

be capable of 20Amps)

Accuracy: 0.02% **

TC: 10ppm/°C
6011A

50mV @100A (0.5mΩ)

Accuracy: 0.05% **

TC: 30ppm/°C
6012B

50mV @ 50A (1.0mΩ)

Accuracy: 0.02% **

TC: 30ppm/°C
6015A

0.1Ω, 15A, ±0.04%**

Value: 50Ω, 5%, 40W

2KΩ, 0.01%, ¼W

Value: 50Ω ± 5%, noninductive

Value: 0.01µF, 600Vdc

P,A

A,T

P

P

Common-Mode
Toroidal Core

≥3.7µH/turn
≅23mm I.D

2

P Ferrox-Cube

500T600-3C8,
Agilent 9170-0061

.

DC Power Supply Voltage range: 0-60Vdc

T,P Agilent 6012B

Current range: 0-50Adc

Variable Voltage
Transformer
(autotransformer)

Range greater than -13% to +6% of
nominal input AC voltage
4KVA

P,A

P = performance testing A = calibration adjustments T = troubleshooting

* Resistors may be substituted for test where an electronic load is not available.
** Less accurate, and less expensive, current-monitor resistors can be used, but the accuracy to which current programming

and current meter reading can be checked must be reduced accordingly.

11

Initial Setup

Maintenance described herein is performed with power supplied to the instrument, and protective covers

removed. Such maintenance should be performed only by service trained personnel who are aware of the
hazards involved (for example, fire and electrical shock). Turn off ac power when making or removing
connections to the power supply. Where maintenance can be performed without power applied, the power
should be removed.

a. Unplug the line cable and remove the top cover by removing the two screws.
b. Slide the cover to the rear.
c. Plug a control board test connector A2P7 onto the A2J7 card-edge fingers.
d. Turn OVERVOLTAGE ADJUST control A3R97 fully clockwise.
e. Disconnect all loads from output terminals.
f. Connect power supply for local sensing, and ensure that MODE switches are set as shown below.

g. Reconnect the line cable and turn on ac power.
h. Allow unit to warm up for 30 minutes.
i. At the beginning of each calibration procedure, the power supply should be in its power-off state, with no external

circuitry connected except as instructed.

j. The POWER LIMIT adjustment (A2R25) must be adjusted at least coarsely before many of the calibration procedures

can be performed. If you have no reason to suspect that the Power Limit circuit is out of adjustment, do not disturb its
setting. Otherwise, center A2R25 before you begin to calibrate the power supply.

Table 2-2. Calibration Procedure

TEST TESTED

VARIABLE

Meter F/S
Adjust.

Resistance
Programming
F/S
Adjust.

Meter Ref.
Voltage

Prog. Voltage VP ( + )

TEST POINTS TEST SEQUENCE AND ADJUSTMENTS EXPECTED

6010A, 6012B
A2J3 pin 7 ( + )
A2J3 pin 10 (-)

6011A, 6015A
A2J3 pin 6 ( + )
A2J3 pin 9 (-)

P ( - )

a. Connect DVM across test points and turn on

ac power.

b. Adjust A2R24 to obtain the voltage range

specified in the results.

a. Connect a 2KΩ 0.01%, ¼W resistor and

DVM between test points.

b. Set MODE switch as in Figure 2-1 and turn on

ac power.

c. Adjust A2R23 to obtain the voltage range

specified in the results.

RESULTS

0.5V ± 50µV

2.5V ±4mV

12

Table 2-2. Calibration Procedure (continued)

TEST TESTED

VARIABLE

V-MON
Zero
Adjust.

Common
Mode
Adjust.

I-MON
Zero
Adjust.

I-MON
F / S
Adjust.

V-MON VM ( + )

Residual
Output
Voltage
VM( + )

I-MON IM ( + )

I-MON IM ( + )

TEST POINTS TEST SEQUENCE AND ADJUSTMENTS EXPECTED

RESULTS

M ( - )

VM ( + )

M ( - )

M (-)

M ( - )

Rm ( + )
Rm ( - )

a. Set voltage and current controls to minimum

settings.

b. Disable power supply as in Initial Setup step i.
c. Short circuit output terminals and connect the

DVM between test points. Turn on power
supply.

d. Adjust V-MON Zero trim pot A2R22 to

voltage range specified in the results.

a. Set voltage and current controls to minimum

and short the unit's sense terminals
( + S & - S).

b. Attach the DVM across test points and disable

power supply as Initial Setup step i.

c. Turn on ac power and record the initial

voltage (IR) with DVM across test points.

d. Remove the local sensing straps and connect a

1Vdc power supply between - S( + ) and –
OUT( - ). See Figure 2-1.

e. Adjust A2R21 to the voltage range specified.
f. Remove the 1V supply and replace jumpers.
a. Set voltage and current controls to minimum.
b. Disable power supply as in Initial Setup step I

and short output terminals. Turn on ac power.

c. Connect DVM across test points and adjust

I-MON Zero trim pot A2R8 as shown in
results.

a. Perform I-MON Zero Adjust before

proceeding .

b. Connect a 0.010Ω (6010A), 0.0005Ω (6011A)

0.0001Ω (6012B), current monitoring resistor
Rm across the output terminals.

c. Turn on ac power and using the “Display

Setting”, set current control to 17A (6010A),
120A (6011A), 50A (6012B), 5A (6015A),
and voltage control to 5V.

d. Connect DVM across test points and take an

initial reading (IR).

e. Connect DVM across Rm monitoring

terminals and adjust A2R9 as shown in the
results.

0 ± 80µV

IR* ±80µV

IR* ±40µV
(6015A)

0± 100µV

IR*

0.034 IR*±

33.5µV (6010A,
6015A)

0.012 IR*
±40µV (6011A,
6012B)

*IR = Initial Reading

13

Table 2-2. Calibration Procedure (continued)

TEST TESTED

VARIABLE

Power
Limit
Adjust.

V(OUT)
I(OUT)

TEST POINTS TEST SEQUENCE AND ADJUSTMENTS EXPECTED

RESULTS

a. Perform I-MON F/S Adjust before

proceeding.

b. Connect the unit to the ac power line via a

variable transformer. Set input power rail to
240Vdc; DVM ( + ) on rear of A1R3 and
DVM (-) to rear of A1R1. Note that power rail
must be maintained at 240Vdc during
calibration.

WARNING

The inner cover must be removed to connect the
voltmeter. Disconnect the power line and wait two
minutes before connecting or disconnecting the
voltmeter.

c. Connect a 3.8Ω (6010A), 0.066Ω (6011A),

0.44Ω (6012B), 40Ω (6015A) resistor or an
electronic load across the unit's output
terminals.

d. Set the load for 18A (6010A), 120A (6011A),

50A (6012B), 5A (6015A), in CC mode, and
turn A2R25 (lower knee) fully counter
clockwise.

e. Turn on power supply and set voltage at 65V

(6010A), 8V (6011A), 22V (6012B), 204V
(6015A), and current at 17.5A (6010A), 121A
(6011A), 51A (6012B), 5.1A (6015A), using
DISPLAY SETTINGS.

f. Turn A2R25 clockwise until CV LED lights.

Output should be 65V ± 0.6V (6010A), 8
±0.08V (6011A), 22 ±0.2V (6012B), 204V
(6015A), and 17A (6010A), 120A (6011A)
51A (6012B), 5.1A (5015A) in CV mode.

g. Turn off ac power and replace the 3.8Ω

(6010A), 0.066Ω (6011A), 0.44Ω (6012B),
40Ω (6015A), resistor with a 38Ω (6010A),

0.36Ω (6011A), 3.3Ω (6012B), 250Ω
(6015A), resistor or reset electronic load for

5.5A (6010A), 55A (6011A), 18.2A (6012B)
in CC mode.

14

Table 2-2. Calibration Procedure (continued)

TEST TESTED

VARIABLE

Power Limit
Adjust
(continued)

TEST POINTS TEST SEQUENCE AND ADJUSTMENTS EXPECTED

RESULTS

h. Turn A2R26 (upper knee) fully counter

clockwise. Turn on the supply and set voltage
at 200V (6010A), 20V (6011A), 60V
(6012B), 500V (6015A), and current at 5.25A
(6010A), 56A (6011A), 19A (6012B) 2.25A
(6015A), using DISPLAY SETTINGS.

i. Turn A2R26 (upper knee) clockwise until CV

LED lights. Output should be 200 ± 2V
(6010A), 20 ±0.5V (6011A), 60 ±0.4V
(6012B), and 5.25A (6010A), 55A (6011A),

18.2A (6012B), 2.2A (6015A), in CV mode.

Figure 2-1. Common Mode Setup

15

Table 2-3. Guide to Recalibration After Repair

Printed Circuit

Board

A1 Main Board R11

A1 Main Board T1, T2 5
A5 Diode Board CR4

A2 Control Board Constant Voltage

A2 Control Board Constant Voltage

A2 Control Board Constant Current

A2 Control Board Power Limit

A2 Control Board Bias Power Supplies
A2 Control Board U7, R84, R85, R24 7

1. V-MON Zero Calibration

2. Common-Mode Calibration

3. I-MON Zero Calibration

Block Name Circuit Within Ref.

CR5, CR1 (6011A)

All Except Current

(CV) Circuit

(CV) Circuit

(CC) Circuit

Comparator

* Code To Calibration Procedure To Be Performed

Source

Current Source All 6

± 15V Supplies

4. I-MON Full Scale (F/S) Calibration

5. Power Limit Calibration

6. Resistance Programming Full Scale (F/S) Calibration

7. Meter Full Scale (F/S) Calibration

Designator

R13 (6011A)

All 1 then 2

All 3 then 4

All 5

All All

Performance Tests

Perform These

Procedures*

3 then 4

5

The following paragraphs provide test procedures for verifying the unit's compliance with the specifications of Table 1-1 in
the Operating Manual. Please refer to CALIBRATION PROCEDURE or TROUBLESHOOTING if you observe
out-of-specification performance.

Measurement Techniques

Setup For All Tests. Measure the DC output voltage directly at the + S and - S terminals. Connect unit for local sensing,
and ensure that MODE switches are set as shown below. Select an adequate wire gauge for load leads using the procedures
given in the Operating Manual for connecting the load.

Electronic Load. The test and calibration procedures use an electronic load to test the unit quickly and accurately. If an
electronic load is not available, you may substitute:

3.5Ω 1000W load resistor (6010A)

0.4Ω 1000W load resistor (6011A)

0.4Ω 1000W load resistor (6012B)
250Ω 1000W load resistor (6015A)

16

for the electronic load in the following tests:

CV Source Effect (Line Regulation)
CC Load Effect (Load Regulation)
Temperature Coefficient (6015A)
Drift (stability ) (6015A)

You may substitute:

40Ω 1000W load resistor (6010A)

0.058Ω 1000W load resistor (6011A)

3.4Ω 1000W load resistor (6012B)
40Ω 1000W load resistor (6015A)

in these tests:

CV Load Effect (Load Regulation)
CV PARD (Ripple and Noise)
CC Source Effect (Line Regulation)
CC PARD (Ripple and Noise)

The substitution of the load resistor requires adding a load switch to open and short the load in the CC or CV load
regulation tests. The load transient recovery time test procedure is not amenable to modification for use with load resistors.

An electronic load is considerably easier to use than a load resistor. It eliminates the need for connecting resistors or
rheostats in parallel to handle the power, it is much more stable than a carbon-pile load, and it makes easy work of
switching between load conditions as is required for the load regulation and load transient-response tests.

Current-Monitoring Resistor Rm. To eliminate output current measurement error caused by voltage drops in the leads
and connections, connect the current-monitoring resistor between -OUT and the load as a four-terminal device. Figure 2-2
shows correct connections. Select a resistor with stable characteristics:

0.010, 0.02% accuracy, 30 ppm/°C (6010A)

0.0005Ω, 0.05% accuracy, 30ppm/°C (6011A)

0.0010Ω, 0.05% accuracy, 30ppm/°C (6012B)

0.010Ω, 0.02% accuracy, 30ppm/°C (6015A)

or lower temperature coefficient and a current rating of:

17A (6010A).
120A (6011A).
50A (6012B)
>5A (6015A)

Figure 2-2. Current-Monitoring Resistor Setup

17

Constant Voltage (CV) Tests

CV Setup. If more than one meter or a meter and an oscilloscope are used, connect each to the + S and - S terminals by a
separate pair of leads to avoid mutual coupling effects. Connect only to + S and -S (except for peak-to-peak PARD)
because the unit regulates the output voltage between + S and - S, not between + OUT and -OUT. Use coaxial cable or
shielded 2-wire cable to avoid pickup on test leads. For all CV tests set the output current at full output to assure CV
operation.

Load Effect (Load Regulation). Constant-voltage load effect is the change in dc output voltage (Eo) resulting from a
load-resistance change from open-circuit to full-load. Full-load is the resistance which draws the maximum rated output
current at voltage Eo. Proceed as follows:
a. Connect the test equipment as shown in Figure 2-3. Operate the load in constant resistance mode (Amps/Volt) and set

resistance to maximum.

b. Turn the unit's power-on, and turn up current setting to full output.
c. Turn up output voltage to:

60Vdc (6010A)

7.0Vdc (6011A)

20.0Vdc (6012B)
200Vdc (6015A)
as read on the digital voltmeter.

Figure 2-3. Basic Test Setup

d. Reduce the resistance of the load to draw an output current of:

17.0Adc (6030A)
120Adc (6011A)
50Adc (6012B)

5.0Adc (6015A)
Check that the unit's CV LED remains lighted.

e. Record the output voltage at the digital voltmeter.
f. Open-circuit the load.

18

g. When the reading settles, record the output voltage again. Check that the two recorded readings differ no more than:

± 0.011Vdc (6010A)
± 0.0037Vdc (6011A)
± 0.007Vdc (6012B)
± 0.033Vdc (6015A)

Source Effect (Line Regulation). Source effect is the change in dc output voltage resulting from a change in ac input
voltage from the minimum to the maximum value as specified in Input Power Requirements in the Specifications Table, in
the Operating Manual. Proceed as follows:
a. Connect the test equipment as shown in Figure 2-3. Operate the load in constant resistance mode (Amps/Volt) and set

resistance to maximum.

b. Connect the unit to the ac power line through a variable autotransformer which is set for low line voltage (104Vac for

120Vac).

c. Turn the unit's power-on, and turn up current setting to full output.
d. Turn up output voltage to:

60.0Vdc (6010A)

20.0Vdc (6011A)

20.0Vdc (6012B)
500Vdc (6015A)
as read on the digital voltmeter.
e. Reduce the resistance of the load to draw an output current of:

17.0Adc (6010A)
50Adc (6011A)
50Adc (6012B)

2.0Adc (6015A)
Check that the unit's CV LED remains lighted.

f. Record the output voltage at the digital voltmeter.
g. Adjust autotransformer to the maximum for your line voltage.
h. When the reading settles record the output voltage again. Check that the two recorded readings differ no more than:

± 0.011Vdc (6010A)
± 0.004Vdc (6011A)
± 0.005Vdc (6012B)
± 0.063Vdc (6015A)

PARD (Ripple And Noise). Periodic and random deviations (PARD) in the unit's output-ripple and noise-combine to
produce a residual ac voltage superimposed on the dc output voltage. Constant-voltage PARD is specified as the
root-mean-square (rms) or peak-to-peak (pp) output voltage in a frequency range of 20Hz to 20MHz (10MHz, 6010A).

RMS Measurement Procedure. Figure 2-4 shows the interconnections of equipment to measure PARD in Vrms. To
ensure that there is no voltage difference between the voltmeter's case and the unit's case, connect both to the same ac
power outlet or check that the two ac power outlets used have the same earth-ground connection.

Use the common-mode choke as shown to reduce ground-loop currents from interfering with measurement. Reduce noise
pickup on the test leads by using 50Ω coaxial cable, and wind it five turns through the magnetic core to form the
common-mode choke. Proceed as follows:
a. Connect the test equipment as shown in Figure 2-4. Operate the load in constant resistance mode (Amps/Volt) and set

resistance to maximum.

b. Turn the unit's power-on, and turn up current setting to full output.
c. Turn up output voltage to:

60Vdc (6010A)
7Vdc (6011A)
60Vdc (6012B)
200Vdc (6015A)

19

d. Reduce the resistance of the load to draw an output current of:

17.0Adc (6010A)
120Adc (6011A)

17.5Adc (6012B)

5.0Adc (6015A)
Check that the unit's CV LED remains lighted.

e. Check that the rms noise voltage at the true rms voltmeter is no more than:

22mV rms (6010A)

8.0mV rms (6011A)

8.0mV rms (6012B)

50mV rms (6015A)

Figure 2-4. RMS Measurement Test Setup, CV PARD Test

Peak Measurement Procedure. Figure 2-5 shows the interconnections of equipment to measure PARD in Vpp. The
equipment grounding and power connection instructions of PARD rms test apply to this setup also. Connect the
oscilloscope to the + OUT and - OUT terminals through 0.01µF blocking capacitors to protect the oscilloscope's input from
the unit's output voltage. To reduce common-mode noise pickup, set up the oscilloscope for a differential, two-channel
voltage measurement. To reduce normal-mode noise pickup, use twisted, 1 meter or shorter, 50Ω coaxial cables with
shields connected to the oscilloscope case and to each other at the other ends. Proceed as follows:

a. Connect the test equipment as shown in Figure 2-5. Operate the load in constant resistance mode (Amps/Volt) and set

resistance to maximum.

b. Turn the unit's power-on, and turn up current setting to full output.
c. Turn up output voltage to:

60Vdc (6010A)

7.0Vdc (6011A)

20

60Vdc (6012B)
200Vdc (6015A)
d. Reduce the resistance of the load to draw an output current of:

17.0Adc (6010A)
120Adc (6011A)

17.5Adc (6012B)

5.0Adc (6015A)
Check that the unit's CV LED remains lighted.

e. Set the oscilloscope's input impedance to 50Ω and bandwidth to 20MHz. Adjust the controls to show the 20KHz and

higher frequency output-noise waveform of Figure 2-6.

f. Check that the peak-to-peak is no more than:

50mV (6010A)
50mV (6011A)
50mV (6012B)
160mV (6015A)

Figure 2-5. Peak-To-Peak Measurement Test Setup, CV PARD Test

Load Transient Recovery Time. Specified for CV operation only; load transient recovery time is the time for the output
voltage to return to within a specified band around its set voltage following a step change in load.

Use the equipment setup of Figure 2-3 to display output voltage transients while switching the load between 10% with the
output set at:

60Vdc (6010A)
7Vdc (6011A)
20Vdc (6012B)

200Vdc (6015A)

21

6010A 6011A

NOT APPLICABLE

6012B 6015A

Figure 2-6. 20KHz Noise, CV Peak-to-Peak PARD

Proceed as follows:

a. Connect the test equipment as shown in Figure 2-3. Operate the load in constant-current mode and set for minimum

current.

b. Turn the unit's power-on, and turn up current setting to full output.
c. Turn up output voltage to:

60Vdc (6010A)

7.0Vdc (6011A)

20.0Vdc (6012B)
200Vdc (6015A)
as read on the digital voltmeter.
d. Set the load to vary the load current between:
15 and 17Adc (6010A)
108 and 120Adc (6011A)
45 and 50Adc (6012B)

4.5 and 5.0Adc (6015A)
at a 30Hz rate for the 10% RECOVERY TEST.

e. Set the oscilloscope for ac coupling, internal sync and lock on either the positive or negative load transient.
f. Adjust the oscilloscope to display transients as in Figure 2-7.

22

g. Check that the pulse width of the transient pulse is no more than:

150mV/2ms (6010A)
100mV/2ms (6011A)
100mV/2ms (6012B)
200mV/5ms (6015A)

6010A 6011A

6012B 6015A

Figure 2-7. Load Transient Recovery Waveform

Temperature Coefficient. Temperature coefficient (TC) is the change in output voltage for each °C change in ambient
temperature with constant ac line voltage, constant output voltage setting and constant load resistance. Measure temperature
coefficient by placing the unit in an oven, varying the temperature over a range within the unit's operating temperature range,
and measuring the change in output voltage. Use a large, forced air oven for even temperature distribution. Leave the unit at
each temperature measurement for half hour to ensure stability in the measured variable. Measure the output voltage with a
stable DVM located outside the oven so voltmeter drift does not affect the measurement accuracy. To measure offset TC,
repeat the procedure with output voltage set to 0.10Vdc.
Proceed as follows:

a. Connect DVM between +S and -S.
b. Place power supply in oven, and set temperature to 30°C.
c. Turn the unit's power-on and turn up current setting to full output.
d. Turn up output voltage to the following:

23

200Vdc (6010A)

20.0Vdc (6011A)

60.0Vdc (6012B)
500Vdc (6015A)
as read on the DVM.

e. After 30 minutes stabilization, record the temperature to the nearest 0.1°C. Record the output voltage on the DVM.
f. Set oven temperature to 50°C.
g. After 30 minutes stabilization, record the temperature to the nearest 0.1°C. Record output voltage.
h. Check that the magnitude of the output voltage change is no greater than

620mV.(6010A)
80mV (6011A)
176mV (6012B)

1.6V (6015A)

Drift (Stability). Drift is the change in output voltage beginning after a 30-minute warm-up during 8 hours operation with
constant ac input line voltage, constant load resistance and constant ambient temperature. Use a DVM and record the output at
intervals, or use a strip-chart recorder to provide a continuous record. Check that the DVM's or recorder's specified drift during
the 8 hours will be no more than 0.001%. Place the unit in a location with constant air temperature preferably a large forced-air
oven set to 30°C and verify that the ambient temperature does not change by monitoring with a thermometer near the unit.
Typically the drift during 30 minute warm-up exceeds the drift during the 8-hour test. To measure offset drift, repeat the
procedure with output voltage set to 0.10Vdc.

a. Connect DVM between + S and - S.
b. Turn the unit's power-on and turn up current setting to full output.
c. Turn up output voltage to:

200Vdc (6010A)
20Vdc (6011A)

60.0Vdc (6012B)

500Vdc (6015A)
as read on the digital voltmeter.

d. After a 30 minute warmup, note reading on DVM.
e. The output voltage should not deviate more than

77mV (6010A)
9mV (6011A)
23mV (6012B)
190mV (6015A)
from the reading obtained in step d over a period of 8 hours.

Constant Current (CC) Tests

CC Setup. Constant-current tests are analogous to constant-voltage tests, with the unit's output short circuited and the
voltage set to full output to assure CC operation. Follow the general setup instructions on Page 16.

Load Effect (Load Regulation). Constant current load effect is the change in dc output current (Io) resulting from a
load-resistance change from short-circuit to full-load, or full-load to short-circuit. Full-load is the resistance which develops
the maximum rated output voltage at current Io. Proceed as follows:

a. Connect the test equipment as shown in Figure 2-3. Operate the load in constant resistance mode (Amps/Volt) and set

resistance to minimum.

b. Turn the unit's power-on, and turn up voltage setting to full output.
c. Turn up output current to:

5.0Adc (0.050Vdc across Rm) (6010A) Check that the AMPS display reads about 5 amps.

50Adc (0.25Vdc across Rm) (6010A) Check that the AMPS display reads about 50 amps.

24

17.5Adc (0.0175Vdc across Rm) (6012B) Check that the AMPS display reads about 17.5 amps.

2Adc (0.20Vdc across Rm) (6015A) Check that the AMPS display reads about 2 amps.

d. Increase the load resistance until the output voltage at +S and -S increases to:

200Vdc (6010A)
20Vdc (6011A)
60Vdc (6012B)
500Vdc (6035A)
Check that the CC LED is lighted and AMPS display still reads ≈ current setting.

e. Record voltage across Rm.
f. Short circuit the load.
g. When the reading settles (≈ 10s), record the voltage across Rm again. Check that the two recorded readings differ no

more than:

0.105mVdc (6010A)

± 0.010mVdc (6011A)
± 0.0118mVdc (6012B)
± 3.4mVdc (6015A)

h. Disconnect the short across the load.

Source Effect (Line Regulation). Constant current source effect is the change in dc output current resulting from a
change in ac input voltage from the minimum to the maximum values listed in the Specifications Table in the Operating
Manual. Proceed as follows:
a. Connect the test equipment as shown in Figure 2-3. Operate the load in constant resistance mode (Amps/Volt) and set

resistance to minimum.

b. Connect the unit to the ac power line through a variable autotransformer set for low line voltage (e.g. 104Vac for

120Vac).

c. Switch the unit's power-on and turn up output voltage setting to full output.
d. Turn up output current to:

17.0Adc (6010A)
120Adc (6011A)
50Adc (6012B)

5.0Adc (6015A)
Check that the AMPS display reads ≈ current setting.
e. Increase the load resistance until the output voltage between + S and - S increases to:
60Vdc (6010A)

7.0Vdc (6011A)

20.0Vdc (6012B)
200Vdc (6035A)
Check that the CC LED is still on and the AMPS display still reads ≈ current setting.

f. Record the voltage across Rm.
g. Adjust autotransformer to the maximum for your line voltage.
h. When the reading settles record the voltage across Rm again. Check that the two recorded readings differ no more than:

± 0.067mVdc (6010A)
± 0.018mVdc (6011A)
± 0.015mVdc (6011A)
± 18mVdc (6015A)

PARD Ripple And Noise. Periodic and random deviations (PARD) in the unit's output (ripple and noise) combine to
produce a residual ac current as well as an ac voltage super-imposed on the dc output. The ac voltage is measured as
constant-voltage PARD. Constant-current PARD is specified as the root-mean-square (rms) output current in a frequency
range 20Hz to 20MHz with the unit in CC operation. To avoid incorrect measurements, with the unit in CC operation,
caused by the impedance of the electronic load at noise frequencies, use a:

0.4Ω (6010A)

0.058Ω (6011A)

0.4Ω (6012B)
40Ω (6015A)

25

load resistor that is capable of safely dissipating 1000 watts. Proceed as follows:
a. Connect the test equipment as shown in Figure 2-8.
b. Switch the unit's power-on and turn the output voltage all the way up.
c. Turn up output current to:

17.0Adc (6010A)
120Adc (6011A)
50Adc (6012B)

5.0Adc (6015A)
Check that the unit's CC LED remains lighted.

d. Check that the rms noise current measured by the current probe and rms voltmeter is no more than:

15mA rms (6010A).
120mA rms (6011A)
25mA rms (6012B)
50mA rms (6015A)

26

Figure 2-8. CC PARD Test Setup

Troubleshooting

Maintenance described herein is performed with power supplied to the instrument, and protective covers

removed. Such maintenance should be performed only by service-trained personnel who are aware of the
hazards involved (for example, fire and electrical shock). Where maintenance can be performed without
power applied, the power should be removed.

Introduction

Before attempting to troubleshoot this instrument, ensure that the fault is with the instrument itself and not with an
associated circuit. The performance test enables this to be determined without having to remove the covers from the supply.

The most important aspect of troubleshooting is the formulation of a logical approach to locating the source of trouble. A
good understanding of the principles of operation is particularly helpful, and it is recommended that Chapter 4 of this
manual be reviewed before attempting to troubleshoot the unit. Often the user will then be able to isolate a problem simply
by using the operating controls and indicators. Once the principles of operation are understood, refer to the following
paragraphs.

Table 2-1 lists the test equipment for troubleshooting. Chapter 6 contains schematic diagrams and information concerning
the voltage levels and waveforms at many of the important test points. Most of the test points used for troubleshooting the
supply are located on the control board test "fingers", which are accessible close to the top of the board. See Table 3-1.

3

If a component is found to be defective, replace it and re-conduct the performance test. When a component is replaced,
refer to Calibration Procedure (Chapter 2). It may be necessary to perform one or more of the adjustment procedures after a
component is replaced.

Initial Troubleshooting Procedures

If a problem occurs, follow the steps below in sequence:

a. Check that input power is available, and check the power cord and rear-panel circuit breaker.
b. Check that the settings of mode switch A2S1 are correct for the desired mode of operation. (See Operating Manual).
c. Check that all connections to the power supply are secure and that circuits between the supply and external devices are

not interrupted.

d. If the power supply fails turn-on self-test or gives any other indication of malfunction, remove the unit from the

operating system before proceeding with further testing.

Some circuits on the power mesh are connected directly to the ac power line. Exercise extreme caution

when working on energized circuits. Energize the supply through an isolation transformer to avoid

shorting ac energized circuits through the test instrument's input leads. The isolation transformer must
have a power rating of at least 4KVA. During work on energized circuits, the safest practice is to
disconnect power, make or change the test connections, and then re-apply power.

Make certain that the supply's ground terminal (┴) is securely connected to an earth ground before applying
power. Failure to do so will cause a potential shock hazard that could result in personal injury.

27

Table 3-1. Control Board Test Connector, A2J7

PIN NO. SIGNAL NAME Vdc WAVEFORM/CONDITIONS SOURCE

Digital-Circuits Bias & Reference Voltages

24 +5V 5.0 A2Q9 (emitter)
22 + 20V(5V UNREG) 20.0 with 120Hz & 40KHz ripple A1CR2, A1CR5
14 2.5V ref 2.50 A2U7 (OUT)
6 0.5V ref 0.50 A2R84,A2R85, A2R24

Analog-Circuits Bias Voltages

2 + 15V 15.0 A2U11 (OUT)
21 - 15V -15.0 A2U12 (OUT )

Status Signals

17

16

13

11

12

Control Signals

CV

CC

OV

DROPOUT

OT

25 PWM OFF
26 PWM ON

TTL Lo if in CV operation A2Q2 (collector)

TTL Lo if in CC operation A2Q1 (collector)

TTL Hi if not OVP shutdown A2U15-13

TTL Hi if ac mains okay A2U15-10

TTL Hi if not overtemp shutdown A4TS1,A5TS1

10

µs TTL pulses, 20KHz

1.7

µs TTL pulses, 20KHz

A2U16-5

A2U15-1
18 Ip MONITOR ½ sawtooth, 20KHz A2CR27 (cathode)
15

DOWN PROGRAM

TTL Hi (6010A, 6015A)

while not down programming A2CR17, CR31(anode)

1.2-3.0 (6011A, 6012B)

7 OVP PROGRAM 1/100 OVP (6010A) e.g.: 2Vdc if OVP set to 200 A3R97 (wiper)

1/10 OVP (6011A) voltage output (6010A)
1/30 OVP (6012B)

1/100 OVP (6015A)

19

Commons & Current-Monitor

PCLR

TTL Hi if +5V bias OK A2UQ11-4

4 L COMMON common return for all bias

voltages, and status and control
signals

9 M COMMON 0.0 common return for 2.5V ref.

and 0.5V ref.

10 I-TEST

≈0.0017 ( Iout)

inboard-side monitoring res. A1R11

AlR13 (6011A))

3 NOT USED
20 Ip-SET

28

≈0.9

A2R25 wiper

Electrostatic Protection

The following caution outlines important precautions which should be observed when working with static sensitive
components in the power supply.

This instrument uses components which can be damaged by static charge. Most semiconductors can
suffer serious performance degradation as a result of static charges, even though complete failure may
not occur. The following precautions should be observed when handling static-sensitive devices.

a. Always turn power off before removing or installing printed-circuit boards.
b.

Always stored or transport static-sensitive devices (all semiconductors and thin-film devices) in conductive material.

Attach warning labels to the container or bag enclosing the device.

c.

Handle static-sensitive devices only at static-free work stations. These work stations should include special conductive

work surfaces (such as Agilent Part No. 9300-0797) grounded through a one-megohm resistor. Note that metal table
tops and highly conductive carbon-impregnated plastic surfaces are too conductive; they can act as large capacitors and
shunt charges too quickly. The work surfaces should have distributed resistance of between 10

d.

Ground all conductive equipment or devices that may come in contact with static-sensitive devices or subassemblies

containing same.

e.

Where direct grounding of objects in the work area is impractical, a static neutralizer should be used (ionized air

blower directed at work). Note that this method is considerably less effective than direct grounding and provides less
protection for static-sensitive devices.

f.

While working with equipment on which no point exceeds 500 volts, use a conductive wrist strap in contact with skin.

The wrist strap should be connected to ground through a one-megohm resistor. A wrist strap with insulated cord and
built-in resistor is recommended, such as 3M Co. No. 1066 (Agilent Part No. 9300-0969 (small) and 9300-0970
[large]).

6

and 10l2 Ω per square.

Do not wear a conductive wrist strap when working with potentials in excess of 500 volts; the one-megohm
resistor will provide insufficient current limiting for personal safety.

g. All grounding (device being repaired, test equipment, soldering iron, work surface, wrist strap, etc.) should be done to

the same point.

h.

Do not wear nylon clothing. Keep clothing of any kind from coming within 12 inches of static-sensitive devices.

i.

Low-impedance test equipment (signal generators, logic pulsers, etc.) should be connected to static-sensitive inputs

only while the components are powered.

j.

Use a mildly activated rosin core solder (such as Alpha Metal Reliacor No. 1, Agilent Part No. 8090-0098) for repair.

The flux residue of this type of solder can be left on the printed circuit board. Generally, it is safer not to clean the
printed-circuit board after repair. Do not use Freon or other types of spray cleaners. If necessary, the printed-circuit
board can be brushed using a natural-bristle brush only. Do not use nylon-bristle or other synthetic-bristle brushes. Do
not use high-velocity air blowers (unless ionized).

k.

Keep the work area free of non-conductive objects such as Styrofoam-type cups, polystyrene foam, polyethylene bags,

and plastic wrappers. Non-conductive devices that are necessary in the area can be kept from building up a static
charge by spraying them with an anti-static chemical (Agilent Part No. 8500-3397).

l.

Do not allow long hair to come in contact with static-sensitive assemblies.

m.

Do not exceed the maximum rated voltages specified for the device.

Repair and Replacement

Repair and replacement of most components in the power supply require only standard techniques that should be apparent
to the technician. The following paragraphs provide instructions for removing certain assemblies and components for which
the procedure may not be obvious upon inspection.

29

To avoid the possibility of personal injury, remove the power supply from operation before opening the
cabinet. Turn off ac power and disconnect the line cord, load, and remote sense leads before attempting

any repair or replacement.

When replacing any heatsink-mounted components except thermostat, smear a thin coating of heatsink
compound between the component and heatsink. If a mica insulator is used, smear a thin coating of
heatsink compound on both sides of the mica insulator.

Do not use any heatsink compound containing silicone, which can migrate and foul electrical contacts
elsewhere in the system. An organic zinc oxide cream, such as American Oil and Supply Company
Heatsink Compound #100, is recommended.

Most of thc attaching hardware in this unit is metric. The only non-metric (sometimes called English or
inch) fittings are listed below. Be careful when both types of screws are removed not to get them
mixed up.

a. Screws that secure the input and output capacitors to A1 main board and output bus.
b.

Rear-panel circuit breaker.

c.

Rear-panel ground binding post.

Top Outside Cover Removal. Remove the two top rear screws using a Size 2, Pozidriv screwdriver. A Phillips head

screwdriver does not fully seat into Pozidriv screws and risks stripping the heads. Remove the top cover by sliding it to the
rear and lifting at the front.

Bottom Cover Removal. Remove the handles from both sides of the unit and remove the bottom cover by sliding it to the

rear. Use a Phillips head #2 screwdriver to remove the handle screws. You do not need to remove the unit's feet.

Inside Top Cover Removal. The unit includes an inside cover which secures the vertical board assemblies. Remove the

inside cover for repair but not for calibration. Remove the nine mounting screws (Pozidriv, M4x7) – two in the left side,
three on the right side, and four on top. Remove the inside cover by lifting at the front edge.

When installing the inside cover, insert it first at the right side. While holding it tilted up at the left, reach through the
cutouts in the cover and fit the top tabs of the A2 control board into the mating slots in the cover. Then repeat the process
for the A4 FET board, and the A5 Diode board. Press the inside cover down firmly while tightening screws that secure
cover to chassis. Be careful when replacing printed-circuit assemblies and covers not to bend any boards or components.

A2 Control Board Removal

After removing the inside cover, unplug the W1 ribbon cable at the front edge of the A2 control board and unplug the W7
and W8 ribbon cables from the lower center of the A2 control board. Remove the A2 board by lifting first at the front edge
and than pulling it up and out of the unit.

When installing the A2 board, insert it first at the rear of the unit. While holding it tilted up at the front, fit the A2TB1
terminal strip into the mating cutout in the rear panel. Then lower the A2 board's bottom tabs into the mating slots on the
chassis. Re-install the W1, W7, and W8 ribbon cables.

A4 FET Board Removal

After removing the inside cover, remove the A4 FET board by lifting, using the large aluminum heatsink as a handle. One
connector and one tab holds the A4 board at its bottom edge.

30

When installing the A4 power mesh board, lower it vertically, placing its tab into the A1 board slot first, align the connector
and press in place.

A5 Diode Board Removal

After removing the cover, remove the A5 Diode board by first removing the two cover screws (Pozidriv) that hold
heatsinks to the A1 board, then lift vertically to remove the A5 Diode board from the connector.

When installing the A5 Diode board, lower it into the mating connector on the A1 board, then install a screw between each
heatsink and Al board.

A3 Front Panel Board Removal

Remove the A3 front panel board by first removing the entire front panel assembly. You do not need to remove the top
cover. Follow this procedure:

a.

Remove the top plastic insert by prying up with a flat-blade screwdriver.

b.

Remove the four front panel assembly mounting screws (Phillips 6-32) two on the top and two on the bottom.

c.

Gently pull the front panel assembly away from the unit as far as permitted by the connecting cables.

d.

Note the locations of the four power-wire connections to the power switch and then unplug the quick-connect plugs.

e.

Unplug the W1 ribbon cable from connector A2J3 on the A2 control board.

f.

Remove the A3 board from the front panel assembly by removing the six mounting screws (Pozidriv, M4x.7)

Install the A3 Board by reversing the steps above. Connect the power switch wires in the exact locations from which they
were removed. See A1 Main Board Removal.

A1 Main Board Removal

Removing the A1 main board requires removing all the vertical boards except the A3 front panel board, and 17 A1 board
mounting screws, four standoffs, and two bus-bar mounting screws. Component-access cutouts in the bottom inside cover
allow unsoldering most A1 board components for repair without removing the A1 board.
Proceed as follows:

To remove the A1 board, proceed as follows:
a.

Remove the A2, A4, and A5 boards according to the above instructions.

b.

Remove the AC power cord from the cooling fan and the four AC Input Power wires.

AC Input Wire Terminal Destination

from color designator location

L6 (chassis) white P left rear
RFI filter white/gray N behind A1K1
Circuit breaker white/brown/gray L behind A1K1
L6 (chassis) white A1K1 front armature

c. Remove the following mounting screws:

2 (1 each) from the output bus bars
7 from the A1 board
4 from transformer AlT2
4 from transformer AlT3
2 from relay AlK1
4 inside-cover mounting posts 5/16 hex

31

d. Lift the A1 board up and toward the rear, then remove the wires from the front panel switch A3S1.

A1 Designator Wire color A3S1 Position (Rear View)

A white/gray Upper right
B gray Upper left
C white/brown/gray Lower left
D white/red/gray Lower right

A3 FRONT PANEL ASSEMBLY

S1

REAR VIEW B-- | --A

C-- | --D

Install the A1 board by reversing the above steps. Be careful to follow the wire color code mentioned above.

Overall Troubleshooting Procedure

Perform the troubleshooting and repair procedures which follow only if you are trained in equipment

service and are aware of the danger from fire and electrical-shock hazards. Some of the procedures include
removing the unit's protective covers which may expose you to potentially lethal electrical shock.
Whenever possible, make test connections and perform service with the power removed.

After performing the Initial Troubleshooting Procedures, focus on developing a logical approach to locating the source of
the trouble. The underlying strategy for the troubleshooting procedures here is to guide you to the faulty circuit nodes
which have improper signals or voltages. It relies on you to identify the particular functional circuit to troubleshoot from
symptom tables and by understanding how the unit works. It then relies on you to discover the defective component or
components which cause the faulty circuit nodes. So, read the BLOCK DIAGRAM overview in Chapter 4 and read the
functional circuit descriptions for the circuits that you suspect may be defective. Then return to this section for help finding
the faulty circuit nodes.

Table 3-1 gives the signals for each of the test points on the control board test connector. This connector is provided in
service kit P/N 5060-2865. The measurements given here include bias and reference voltages as well as power supply status
signals and waveform information. To troubleshoot the power supply the A4 power FET board and A2 control board can be
raised out of the unit using extender boards and cables provided in service kit P/N 5060-2865.

The A4 power FET board should only be raised on its extender when using the Main Troubleshooting

Setup; NEVER when the unit is operated with its normal (
damage to the unit and is a shock hazard.

Table 3-2 provides troubleshooting information based on the status of the PWM-ON and PWM-OFF signals which drive
the PFETs. This table is used for no-output failures.

Tables 3-3 and 3-4 give measurements for the test points on the A3 front panel board and possible failure symptoms
respectively.

Table 3-5 describes possible symptoms for overall performance failures of the power supply. It is necessary to have a
properly working front panel before using this table.

≈ 300Vdc ) bus voltage. To do so can cause

Chapter 6 contains schematic diagrams and voltage levels, and component location diagrams to help you locate components
and test points.

32

Make most voltage measurements (except DC-to-DC Converter and ac mains-connected circuits) referenced to the unit's
output common. The output common is accessible at rear-panel
given.

M terminal. All voltages are ± 5% unless a range is

Using the Tables

Typically there will be two types of power supply failures; no-output and performance failures.

1.

NO-OUTPUT FAILURE: Start with the TROUBLESHOOTING NO-OUTPUT FAILURES section which

references Tables 3-1 and 3-3.

2.

PERFORMANCE FAILURE: If the power supply produces an output but does not perform to specifications, begin by

verifying the measurements at the A2J7 test connector using Table 3-1. Next, verify the front panel by doing the
procedure outlined in the FRONT PANEL TROUBLESHOOTING section. After the front panel has been verified
consult Table 3-5 for the performance failure symptom which seems closest to the one observed and proceed to the
functional circuit given for that failure.

The circuits referenced in Tables 3-2 and 3-5 are derived from functional blocks of circuits in the power supply. These
blocks are given in the Power Supply Blocks section starting on page 40. Troubleshooting information for each block will
include a brief description of the circuit involved. The columns provided in each block are as follows:

NODE: This column lists the nodes where the measurements should be taken. In some cases this will be

stated as NODE ( + ) and NODE (- ) where the first is the test node and the second is the
reference.

SETUP: If a certain setup is required for the measurement, it will be given in this column.

MEASUREMENT: This column indicates what the expected measurement is for the given node.

SOURCE: If applicable, the components which generate the signal will be provided in this column .

Some blocks will have Input and Output sections. The input section will have a source column to indicate which
components generated the measured signal. The output section will list all the important output signals from that block.
However, because the outputs of one block are the inputs to another, the schematic should be consulted if an output
measurement is incorrect. This will indicate the next circuit block to be trouble shot.

Main Troubleshooting Setup

Figure 3-1 shows the troubleshooting setup for troubleshooting all of the unit except the front panel and initial no output
failures (see page 36). The external power supply provides the unit's internal bus voltage. The ac mains cord connects to the
unit's A1T3 bias transformer via an isolation transformer, thereby energizing the bias supplies, but it does not connect to the
input rectifier and filter because that would create the bus voltage. With the external supply the unit operates as a dc-to-dc
converter. The supply biases the A4Q1, A4Q2, A4Q3 and A4Q4 PFETs with a low voltage rather than the 320Vdc bus
voltage. This protects the PFETs from failure from excess power dissipation if the power-limit comparator or the off-pulse
circuitry are defective. It also reduces the possibility of electrical shock to the troubleshooter.

33

Figure 3-1. Main Troubleshooting Setup

An isolation transformer provides ac voltage that is not referenced to earth ground, thereby reducing the

possibility of accidentally touching two points having high ac potential between them. Failure to use an
isolation transformer as shown in Figure 3-1 will cause the ac mains voltage to be connected directly to
many components and circuits within the power supply, including the FET heatsinks, as well as to the
terminals of the external dc power supply. Failure to use an isolation transformer is a definite
personal-injury hazard.

The troubleshooting setup of Figure 3-1 connects high ac voltage to relay K1, fan B1, fuseholder A1F1, and
other components and circuits along the front of the A 1 main board.

As a convenience in implementing the troubleshooting setup, prepare cord sets as shown in Figure 3-2. This facilitates
connecting the unit's input power rail to the external supply and connecting the bias transformer to the isolation
transformer.

34

Figure 3-2. Modified Mains Cord Set For Troubleshooting

With the mains cord unplugged proceed as follows:

a.

Remove the top cover and the inside cover as described on page 30. Remove fuse A1F1.

Failure to remove fuse AlF1 will result in damage to the unit; damage to the external DC supply and a

shock hazard to you.

b. Install control board test connector onto the A2J7 card edge fingers.
c.

Connect a 50 Ω, 40W, load resistor to the unit's output terminals.

35

d. Place the front panel power-on switch in the off position. Remove the ac input cover from the rear panel and connect the

"L" and "N" screws on the barrier block to the output of the external DC supply. If a line cord is already connected to
these terminals, construct an adapter as shown in Figure 3-2 (a), which allows you to connect the cord to the DC supply.
In either case ignore polarity as the unit's rectifying diodes steer the dc power to the correct nodes.

e.

Complete the setup of Figure 3-1 by attaching an ac mains cord to test points J8 (L, black wire) and J7 (N, white wire)

and connect the green ground wire to the unit's case ground terminal or a suitably grounded cabinet screw. See Figure
3-2 (b). Plus the mains cord into an isolation transformer.

Troubleshooting No-Output Failures

Note The main troubleshooting setup is not used for the No Output Failures and Front Panel troubleshooting

tests.

No-output failures often include failure of the A4Q1 through A4Q4 PFETs and their fuses, A4F1 and A4F2. When either
the off-pulses or the power-limit comparator fails, the PFETs can fail from excessive power dissipation. The strategy for
localizing no-output failures is to check the voltages and waveforms at the control board test connector to predict if that
circuit failure would cause the PFETs to fail. This makes it possible to develop your troubleshooting approach without an
extensive equipment setup. Proceed as follows:

a.

With the mains cord unplugged remove the A4 FET Driver board as described on page 30. Plug in the mains cord and

switch on power.

b.

Using Table 3-1 check the bias voltages, the PWM-OFF, PWM-ON and Ip MONITOR Control signals and other

signals of interest at the A2 control board test fingers, A2J7.

c.

Check for the presence of program voltages, VP and IP, at the rear panel.

d.

Check for presence of the 320Vdc rail voltage between the rear facing end of AlR3 and the rear facing end of AlR1. If

there is no rail voltage, check diode Assembly A1U1.

A1R1, A1R3, and AlU1 connect to the ac mains voltage. Use a voltmeter with both input terminals floating

to measure the rail voltage.

e. Select the functional circuit for troubleshooting based on your measurements and Table 3-2, which provides direction

based on the status of the PWM OFF and PWM ON signals .

Front Panel Troubleshooting

Troubleshoot the A3 front panel board by first doing the following setup:

a.

Remove the top plastic insert from the front frame by prying up with a flat-blade screwdriver.

b.

Remove the 4 front panel assembly mounting screws (Phillips 6-32), two on top and two on the bottom.

c.

Detach the A3 board from the front panel assembly by removing the 6 mounting screws (Pozidriv, M4x7).

d.

Place the A3 board vertically against the supply with a piece of insulating material between. The test connector can

then be attached to the A3 board. The rest of the front panel assembly can stand vertically so that the pots and the
switches can be accessed while troubleshooting.

e.

Plug in the mains cord and switch on power.

The ac mains voltage connects directly to the LINE switch and to components and traces at the front of the

A1 main board. Be extremely careful to avoid touching the ac mains voltage.

Start troubleshooting by performing the tests given in Table 3-3. This table provides the measurements for the test points on
the test connector as well as the source components for that measurement. Table 3-4 gives front panel symptoms as well as
the circuits or components that may cause the supply to exhibit those symptoms. Both Tables 3-3 and 3-4 should be used to
check out and troubleshoot the front panel.

36

Table 3-2. No-Output Failures

(Bias supplies and AC turn-on circuit functioning)

Status of PFET on/off-Pulses

PWM-ON

A2J7-26

PWM-OFF

A2J7-25

DEFECTIVE

BOARD

CHECK FUNCTIONAL CIRCUITS

lo lo A2 Control ckts: CV & CC thru on- & off-Pulse Oneshots *

lo hi A2 & A4 PWM and DC-to-DC Converter: A4Q1, A4Q2, A4Q3 and A4Q4

probably failed

hi lo A2 & A4 PWM and DC-to-DC Converter: A4Q1, A4Q2, A4Q3 and A4Q4

probably failed

hi hi A2 & A4 PWM and DC-to-DC Converter: A4Q1, A4Q2, A4Q3 and A4Q4

probably failed

lo N A2 A2U15A,on-Pulse Oneshot and A2Q11

N lo A2 & A4 Off-Pulse Oneshot and DC-to-DC: A4Q1, A4Q2, A4Q3 and A4Q4

probably failed

hi N A2 & A4 A2U15A, on-Pulse Oneshot & DC-to-DC: A4Q1, A4Q2, A4Q3, and

A4Q4 probably failed

N hi A2 & A4 off-Pulse Oneshot and DC-to-DC: A4Q1, Q4Q2, A4Q3 and A4Q4

probably failed

N N A2 & A4 Power-Limit Comparator and DC-to-DC: A4Q1, A4Q2, A4Q3 and

A4Q4 probably failed

lo= TTL low hi= TTL high N = normal 20KHz pulse train, TTL levels

* Decide which to troubleshoot -- the CV Circuit, the CC Circuit, or the PWM and Off-Pulse & On-Pulse Oneshots -- by
measuring the CV CONTROL (A2CR24, cathode) and the CC CONTROL (A2CR11 cathode) voltages. Troubleshoot
whichever is negative, and if neither is negative, troubleshoot the PWM. Make these voltage measurements after you have
implemented the Main Troubleshooting Setup.

Table 3-3. Front Panel Board Tests

.

Pin

No

Signal Name Measurement Description Source

1 +7.5V 7.5V Derived from + 15V bias. A3VR2, A3R93
2 -1V -1.0V Derived from –15V bias. A3R89, A3R94, A3C17
3 CV VOLTAGE 0-5V For 0 to full scale output voltage. A3U6-6, A3R88, A3CR1
4 CC VOLTAGE 0-5V For 0 to full scale output current. A3U7-1, A3R58
5 VOLTS test -1888 on volts

Jumper to + 5V on A3 board. A3U1-37

display

6 AMPS test -1888 on amps

Jumper to + 5V on A3 board. A3U2-37

display
7 VOLTS input 0-1V For 0 to full scale output voltage. A3U4-2,3,10
8 VOLTS low range TTL high If VOLTS display is below 20 volts

A3U5-13

(press DISPLAY SETTINGS).

9DISPLAY

SETTINGS

10 DISPLAY OVP TTL high If DISPLAY OVP switch on front

TTL lo If DISPLAY SETTINGS switch on

front panel is depressed.

A3S1,A3R85

A3S2,A3R64

panel is depressed.
11 AMPS input 0-600mV For 0 to full scale output current. A3R56,A3R58
12 -5V -5.0V Derived from -15V bias. A3VR1, A3R90
13 buffered OVP 0-2.2V 1/30 of OVP voltage setting when

A3U7-7,A3CR5
DISPLAY OVP switch is depressed
varies with OVP ADJUST pot.

37

Troubleshooting Bias Supplies

+5V on A2 Control Board. The PWM A2U22 includes a clock generator (40KHz set by A2R170, A2C79, and A2Q10),

and a current limit (2Adc set by 0.15Vdc across A2R172). It turns off each output pulse using the difference between the
voltage at voltage divider A2R161-A2R163 and the 2.5Vdc set by voltage regulator A2U21.

Circuit Included. + 5Vdc bias supply circuitry from connector pin A1J5-1,3 (1,3 both pins) through jumper A2W3 on A2

control board.

Setup. The Main Troubleshooting Setup, page 33. Apply the ac mains voltage to the isolation transformer, and set the

external supply to 0Vdc.

Input:

NODE + NODE - MEASUREMENT SOURCE

A2J7-22 A2J4-4.

Outputs

NODE MEASUREMENT

A2U22-6
A2U22-12,13
A2Q9 (emit)
A2U21 -2 2.5Vdc
A2R161, A2R163 2.5Vdc

≈ 2 to 4Vdc sawtooth, 40KHz
≈ 19Vpk, 15µs pulses, 40KHz
≈ 20Vpk, 5µs pulses, 40KHz

≈ 20Vdc

A1CR2,AlCR5

To check if load on + 5V is shorted, remove jumper A2W3

Table 3-4. A3 Front Panel Board Failure Symptoms

SYMPTOMS DEFECTIVE CIRCUIT CHECK COMPONENTS

Error when pressing DISPLAY SETTINGS Limits display. A3U5, A3U8
Error in VOLTS or AMPS Input ranging or DVMS. A3U8,A3U6,A3U4,A3U1,A3U2,

A3U7
* One or more display digits out Display LEDs. A3DS1 through A3DS8
Unable to adjust VOLTAGE or CURRENT
or always max
VOLTS decimal point error Decimal drivers. A3U3
* Note that the Volts and Amps tests (Table 3-3 pins 5 and 6) verify that all the current and voltage display segments light
except for the decimal points.

Table 3 5. Performance Failure Symptoms

SYMPTOMS DEFECTIVE

Unexplained OVP shutdowns A2 OVP Circuit, CV Circuit

No current limit A2 CC Circuit

Max current < 17Adc A2 CC Clamp, CC Circuit

Max power < specified A2, A1 Power Limit, 20KHz clock, transformer A1T2

Max voltage < 200Vdc A2, A1 CV Circuit, diodes A1U1, mains voltage select

Cycles on & off randomly A2, A1 AC-Surge-&-Dropout Detector, Mains Voltage

Potentiometers. A3R99, A3R100

CHECK FUNCTIONAL CIRCUITS

BOARD

jumper A1W1

Select switch A1S2

38

Table 3 5. Performance Failure Symptoms (continued)

SYMPTOMS DEFECTIVE

BOARD

CHECK FUNCTIONAL CIRCUITS

CV overshoots A2 A2U5A, A2CR19, A2R62

Output noise ( < 1KHz) A2, A1 CV Circuit, Input Filter

Output noise ( > 1KHz) A1, A4 Transformer A1 T2, output Filter, snubbers A4R1

to A4R11, A4R13 to A4R19, A4C1 to A4C4,

A4CR1 to A4CR4
CV regulation, transient response,
programming time

A2, A1 Wrong sensing (paragraph 3-40), low ac mains

voltage, CV Circuit
CC regulation A2 Low ac mains voltage, CC circuit

CV oscillates with capacitive loads A2 A2R61, A2R60, A2R58, A2R59, A2C33, A2R64,

A2R68, A2C36, A2C37, A2U5, A2R65
CC oscillates with inductive loads A2 A2R61, A2R60, A2R58, A2R57, A2C33, A2R19,

A2C11, A2R58, A2C12, A2U4, A2R35, A2C20,

A2R37, A2C17, A2R29, A2C18, A2R31

+15V on A2 Control Board. Voltage regulator A2U11 regulates the voltage across resistor A2R99 to be 1.25Vdc. That

sets the current through zener diode A2VR3 at 7.5mAdc. The output voltage is 1.25Vdc plus 11.7Vdc across A2VR3 plus
the voltage across A2R100.

Circuit Included. + 15Vdc bias supply circuitry from connector pin A2J5-5 through test point A2J7-2 on A2 control board.

Setup. The Main Troubleshooting Setup, page 33. Apply the ac mains voltage to the isolation transformer, and set the

external supply to 0Vdc.

Input:

NODE (+ ) NODE ( - ) MEASUREMENT SOURCE

A2C52(+) A2C52(-)

≈ 27Vdc

A1U4 ,AlC15 (+)
A1U4,A1C17 (+) (6011A)

Outputs:

NODE ( + ) N0DE ( - ) MEASUREMENT

A2J7-2 A2U11 (ADJ) 1.25Vdc
A2J7-2 A2VR3 (Anode) 12.9Vdc
A2J7-2 A2VR2 (Anode) 6.2Vdc
A2C50 ( + ) A2C50 ( - ) 13.8Vdc

To check if load on + 15V is shorted, remove jumper A2W1 .

-15V on A2 Control Board. Voltage regulator A2U12 regulates the voltage across resistor A2R103 to be 1.25Vdc.

Circuit Included. -15Vdc bias supply circuitry from connector pin A2J5-6 through test point A2J7-21 on A2 control

board.

Setup. The Main Troubleshooting Setup, page 33. Apply the ac mains voltage to the isolation transformer, and set the

external supply to 0Vdc.

39

Input:

NODE ( + ) NODE ( - ) MEASUREMENT SOURCE

A2C55(+) A2C55(-)

Outputs:

NODE ( + ) N0DE ( - ) MEASUREMENT

A2J7-21 A2U12-3 (ADJ) -1.25Vdc
A2J7-21 A2VR4 (Anode) -12.9Vdc
A2C54 ( + ) A2C54 ( - ) 13.8Vdc

To check if load on -15V is shorted, remove jumper A2W3.

Refer to Down Programmer, page 42, for the + 10.6V bias supply, and refer to OVP Circuit, page 45, for the +2.5V bias
supply.

≈ 27Vdc

A1U4, AlC16 ( - )
A1U4, AlC18 ( - ) (6011A)

Power Section Blocks

This section contains the blocks referenced in Tables 3-2 and 3-5.

Troubleshooting AC-Turn-on Circuits

Relay A1K1 closes at 2.5 seconds and DROPOUT goes high at 2.9 seconds after 20V (5V UNREG) reaches about 13Vdc.
DROPOUT high enables the PWM if OVERVOLTAGE, and OVERTEMPERATURE are also high.

Circuits Included. AC-Surge-&-Dropout Detector, Bias Voltage Detector, Delay Circuits, and Relay Driver--all on A2

control board.

Setup. The Main Troubleshooting Setup, page 33. Apply the ac mains voltage to the isolation transformer, and set the

external supply to 0Vdc.

Inputs:

NODE ( + ) * SETUP MEASUREMENT SOURCE

A2J7-24 5.0Vdc A2Q9 (emit.)
A2J7-22
A2U11-16 f.w.rect.,0.8Vpk A1CR3,AlCR4
A2U20-13 TTL sq wave,20KHz A2U20-6

Outputs:

NODE ( + ) * SETUP MEASUREMENT

A2U17-9 cycle power
A2U17-14 cycle power
A2Q11-14 cycle power transition 0 to 5Vdc at 2.5 sec
A2Q11-4 hi (5Vdc)
A2U9-10 cycle power 2.9 s burst 1.25KHz sq. wave
A2U9-15 cycle power one 840ms pulse then hi at 2.5 sec
A2U9-14 cycle power three 420ms pulses then hi at 2.9 sec
A2U9-1 cycle power transition lo to hi at 1.7 sec

≈ 21Vdc

≈ 13.5Vdc
≈ 1.4Vdc

A1CR2,AlCR5

40

A2U15-10 cycle power transition lo to hi at 2.9 sec

(

FAULTAC )

A2Q7-C cycle power transition 5.0 to 0.3Vdc at 2.5 sec

(

* NODE ( - ) = A2J7-4

ENABLERELAY )

Troubleshooting PWM & Clock

The inputs to inhibit Gate A2U18A and PWM gate A2U18B are the keys to PWM troubleshooting. The 20KHz clock starts
each PWM output pulse, and the pulse stops when any of the inputs to A2U18A or A2U18B goes low. The PWM is
inhibited and prevented from initiating output pulses as long as any of the seven inputs is low.

Circuit Included. Pulse Width Modulator (PWM), Off-Pulse Oneshot, On-Pulse one-Shot, 20KHz Clock.

Setup. The Main Troubleshooting Setup, page 33. Apply the ac mains voltage to the isolation transformer. Adjust the units

current setting above 1.0Adc. Set the external supply (EXTERNAL) and adjust the unit's voltage setting (INTERNAL) as
instructed below. Use the "DISPLAY SETTINGS" switch to make adjustments to the unit's current or voltage setting.

Inputs:

NODE ( - ) = A2J7-4

NODE ( + ) SETUP MEASUREMENT SOURCE

A2J7-24 5.0Vdc A2Q9, A2W3
A2U18-10 hi A2U15-10
A2U18-12 hi A2U15-13
A2U18-13 hi A5TS1, A4TS1
A2U18-5 hi A2U18-8
A2U18-2 hi A2U8-2
A2U18-1 Set OUTPUT ADJUST

for 1Vdc

hi A2U10-7

Outputs:

SET VOLTAGE (Vdc)

NODE ( + ) EXTERNAL INTERNAL MEASUREMENT

A2U20-1 0 0 TTL sq wave, 320KHz
A2U20-5 0 0 TTL sq wave, 40KHz (80KHz, 6015A)
A2U20-6 0 0 TTL sq wave, 20KHz
A2U19-5 0 2 20KHz
A2U19-6 0 2 20KHz
A2U16-5 40 2
A2U16-5 40 0 lo
A2U16-4 40 20
A2U16-4 40 0 hi
A2U15-1 40 20
A2U15-1 40 0 lo
+ OUT 40 20

+ OUT 40 2 20Vdc (CV)

10

µs pulse, 20KHz

µs pulse, 20KHz

48

1.7

µs pulse, 20KHz (80Vdc, 6015A)

≈ 40Vdc (UNREGULATED)

14Vdc (6011A, 6012B)
80Vdc (6015A)

2.0Vdc (6011A, 6012B, 6015A)

41

Troubleshooting DC-To-DC Converter

Parallel NOR gates A4U1, A4U2 and A4U3A act as drivers and switch on FETs A4Q1, Q2, Q3 and Q4 through pulse
transformer A4T1. NOR gate A4U3B turns off the FETs through pulse transformer A4T2 and transistors A4Q5 and A4Q6.

Circuits Included. On-Pulse Driver, Off-Pulse Driver, FET Switches and Drivers on A4 FET board.

Setup. The Main Troubleshooting Setup, page 33. Apply the ac mains voltage to the isolation transformer, and set the

external supply to 40Vdc. Set the unit's output voltage to 20Vdc and current to above 1Adc using "DISPLAY SETTINGS"
switch. Verify that the UNREGULATED LED lights. See Figure 3-3 for waveforms.

Inputs:

NODE ( + ) NODE ( - ) MEASUREMENT SOURCE

A2J7-26
(PWM-ON)
A2J7-25
(PWM-OFF)
A4P1-C1
A4Q2-D A4Q4-S 39Vdc A1C5 (+), A4P1-22 to 25

Outputs:

NODE ( + ) NODE ( - ) MEASUREMENT

A4Q1/Q2-G A4Q2-S (see Waveform 3)
A4Q3/Q4-G A4Q4-S (see Waveform 3)
A4Q2-S A4Q4-D (see Waveform 4)
A2J7-18 A2J7-4 (see Waveform 5)

M

M

M

µs 20KHz pulse

1.7
(see Waveform 1)
10

µs 20KHz pulse

(see Waveform 2)

10.6Vdc A1U3-2

A2J5-11, A2U15-1, A4P1-A3

A2U16-5, A2J5-13, A4P1-A2

A1C1(-), A4P1-16 to 18

If you replace the FETs, replace both the FETs and associated drive components as furnished in FET Service Kit, Agilent
Part No. 5060-2866.

The FETs are static sensitive and can be destroyed by relatively low levels of electrostatic voltage.
Handle the A4 FET board and the FETs only after you, your work surface and your equipment are
properly grounded with appropriate resistive grounding straps. Avoid touching the FET's gate and

source pins.

Troubleshooting Down Programmer

The down programmer discharges the output when either PWM OFF is generated or CV ERROR is more negative than
about - 3Vdc. Comparator A5U1 triggers down programming when the voltage at A5U1-5 is less than about 4Vdc.

Circuit Included. Down programmer and 10.6V bias supply on A1 main board.

Setup. The Main Troubleshooting Setup, page 33, except connect the external supply to the unit's + OUT ( + ) and – OUT

( - ) terminals. Apply the ac mains voltage to the isolation transformer. Set the external supply for an output voltage of
10Vdc and set current limit for 2.5 Amps. Set the power supply under test for a voltage setting of 8.0Vdc and current
setting of 2.0Adc using "DISPLAY SETTINGS".

42

Figure 3-3. Waveforms

43

Outputs:

NODE ( + ) EXTERNAL SUPPLY MEASUREMENT

A5C3 (+) ON/OFF 10Vdc
A5VR1(K) ON/OFF 6.5Vdc
A5U1-3 ON/OFF 0.2Vdc
A5CR2(K) OFF 1.8Vdc
A5CR2(K) ON 0.2Vdc
A5U1-1 OFF 0.5Vdc
A5U1-1 ON 5.0Vdc
+R20 OFF <0.001Vdc
+R20 ON 1.5Vdc

NODE ( - ) = A2J7-4

Troubleshooting CV Circuit

V-MON, the output of CV Monitor Amp A2U2, is 1/40 (1/4, 6011A, 6012B) the voltage between + S and - S. CV Error
Amp A2U3 compares V-MON to CV PROGRAM. Innerloop Amp A2U5A stabilizes the CV loop with input from A2U5B.
The measurements below verify that the operational amplifier circuits provide expected positive and negative dc voltage
excursion when the CV loop is open and the power mesh shut down.

Circuits Included. Constant Voltage (CV) Circuit and buffer amplifier A2U5B.

Setup. The Main Troubleshooting Setup, page 33. Apply the ac mains voltage to the isolation transformer, and disconnect

the external supply Remove the + S jumper and connect A2J7-2 ( + 15V) to + S. Set mode switch settings B4, B5 and B6
all to 0. Set VP to 0Vdc by connecting to
VP and

P are on rear-panel terminal block.

P or set VP to + 5Vdc by connecting to A2J7-24 according to SETUP below.

Outputs:

NODE ( + ) NODE ( - ) SETUP MEASUREMENT

VM A2J7-4 3.75Vdc
A2U5-1 A2J7-4 VP = 0 -14Vdc
A2U3-6 A2J7-4 VP = 0 -14Vdc
A2U5-1 A2J7-4 VP = 5 13Vdc

4.7Vdc (6011A, 6012B, 6015A)

A2U3-6 A2J7-4 VP = 5

A2U5-7 A2J7-4 short A2J7-24 to A2U5-5 + 7.5Vdc

If the failure symptoms include output voltage oscillation, check if the CV Error Amp circuit is at fault by shorting A2U3-6
to A2U3-2. If oscillations stop, the CV Error Amp circuit is probably at fault.

≈ 0Vdc

5.1Vdc (6011A, 6012B, 6015A)

Troubleshooting CC Circuit

I-MON, the output of CC Monitor Amp A2U1, in volts is ≈ 1/3 (1/24, 6011A) the output current in amperes. CC Error
Amp A2U4C compares I-MON to CC PROGRAM. Differentiator circuit A2U4A differentiates the inboard voltage sense
to stabilize the CC loop. Its output is summed with I-MON at CC Error Amp A2U4C.

The measurements below verify that the operational amplifier circuits provide expected positive and negative do voltage
gain when the CC loop is open and the power mesh shut down.

44

Circuits Included.

Setup. The Main Troubleshooting Setup, page 33, except connect the external supply with polarity reversed to the unit's +

OUT ( - ) and - OUT ( + ) terminals. Apply the ac mains voltage to the isolation transformer. Set the external supply to

3.0Adc constant current with a voltage limit in the range 5 to 20Vdc. Set mode switches B1, B2 and B3 to 0. Set IP to 0Vdc
by connecting to

Outputs:

NODE ( + ) NODE ( - ) SETUP MEASUREMENT

IM A2J7-4 IP = 5 (6015A) 0.125Vdc (0.88Vdc, 6015A)
A2U4-8 A2J7-4 IP = 0 -14Vdc
A2U4-8 A2J7-4 IP = 5 +14Vdc

If the failure symptoms include output current oscillation, check if the differentiator circuit is at fault by removing resistor
A2R35 ( 1M ohm) (3.3M ohm, 6011A). If oscillations stop, the differentiator is probably at fault.

Constant Current (CC) Circuit on A2 control board.

P or set IP to + 5Vdc by connecting to A2J7-24 according to SETUP below.

Troubleshooting OVP Circuit

Flip-flop A2U8A-A2U8D is set by comparator A2U8C and reset by PCLR . TTL low at A2U18-12 inhibits the PWM.
OVP Program Voltage on A2J7-7 is equal to Eout/10.

Circuit included. OVP Circuit and 2.5V bias supply on A2 control board.

Setup. The Main Troubleshooting Setup, page 33, except connect the external supply to the unit's + OUT ( + ) and - OUT

( - ) terminals. Apply the ac mains voltage to the isolation transformer. Adjust the unit's OVP limit to 10Vdc. Set the
external supply (EXTERNAL) as instructed below.

Outputs:

NODE ( - ) = A2J7-4

NODE ( + ) SET VOLTAGE

EXTERNAL (Vdc)

A2U7-2 - 2.5Vdc
A2J7-7 - 1.0Vdc

A2J7-13 5 hi
A2J7-13 15 lo
A2J7-13 5 lo
A2J7-13 5 cycle power hi
* Front panel OVP control turned fully cw.

SETUP MEASUREMENT

≈2.2Vdc (6015A)*

Note Connecting a test probe to either input of either comparator in the OV Flip flop (pins A2U8-1, 6, 7, 10, 11

or 13) may cause the flip flop to change states and cause the probed input to be low.

45

4

Principles of Operation

Autoranging Power

Autoranging allows the unit to be compact and light weight and yet to deliver a range of output voltage/current
combinations which would otherwise require the use of more than one supply or a higher rated power supply. Autoranging
is a name for circuitry which automatically makes full power available at all but low rated output voltages and currents. By
comparison, a conventional constant voltage/constant current (CV/CC) power supply can provide full output power only at
maximum rated output voltage and current.

Overview

The Simplified Schematic, Figure 4-1, shows how the major circuits are connected. Segmenting the Simplified schematic
into functional circuit blocks will highlight how these blocks work and illustrate overall system function.

Table 4-1 briefly describes the major circuits employed in the design of this unit. When used in conjunction with the
Simplified Schematic, the reader is provided with a quick overall appreciation of the unit's operation.

Power flows from the ac mains at the left of the schematic through circuit blocks connected by heavy lines to the output
terminals at the right. Follow the schematic from right to left to see how the output voltage is regulated during CV mode of
operation, The output voltage is monitored both at the output sense terminals + S and - S; OVS (Outerloop Voltage Sense)
and also before the two stages of output filter IVS (InnerLoop Voltage Sense).

Sensing with output sense terminals provides accurate load-voltage control and sensing before the output filter stabilizes the
supply and permits it to power reactive loads. The CV monitor amplifier buffers the OVS voltage to produce the V-MON
output monitoring voltage. A buffer amplifier monitors the voltage before the output filter to produce the IVS voltage.

When in CC operation, the output current is regulated in a similar manner. Output current is sensed as the OCS outerloop
voltage across a current monitoring resistor. OCS is buffered to produce l-MON. IVS is differentiated to produce an
innerloop current sensing voltage.

System Description

The Agilent 6010A /6011A/6012B/6015A are power supplies which utilizes the principle of switching to achieve
regulation. Basically, the power supply employs five major functional sub-systems together with the Front Panel to achieve
its overall objective of delivering a maximum of 17A or 200V (6010A); 120A or 20V (6011A); 50A or 60V (6012B); 5A
or 500V (6015B), at the power output of 1000W.

These sub-systems are

1.

Regulation & Control

2.

Protection

3.

Input Power

4.

DC Power Conversion
Output

5.

47

Regulation & Control Subsystem

This sub-system may be considered to be the brains of the unit. It provides the control pulses to open and close the
switching elements which deliver power to the output. This section also regulates the output to ensure that the unit is
delivering a constant power at either a constant voltage or constant current setting. In the event that this cannot be achieved,
then the protection subsystem is employed to limit the power to the output.

To understand how this control is achieved, consider Figure 4-1, the simplified schematic. Power from the output is
sampled and attenuated before it is fed back to the Constant Voltage Error Amplifier. Another input to this amplifier is the
Program Voltage which the user sets via the front panel. The difference between these two voltages is amplified and
becomes the CV Error Signal. The output of the supply is also sampled by the CC Monitor Amp. This sample voltage is fed
into the Constant Current Error Amp. The other input to the Constant Current Error Amp is the program current which the
user sets via the front panel. The difference between these two voltages is amplified and becomes the Constant Current
Error Signal. These two signals are connected in a wired-OR configuration and fed into the Constant Voltage Comparator.

The control mechanism which the unit employs to regulate its output comprises the Primary Current Monitor Transformer,
the Control Voltage Comparator and the Pulse Width Modulator. The Primary Current Monitor Transformer senses the
power transferred by the FETs and generates the Ip Ramp Voltage which continues to build up as the output increases. This
Ramp Voltage and the Control Voltage are used as inputs to the control voltage Comparator. If the Ramp Voltage exceeds
the Control Voltage, the output of the comparator goes low and resets the Pulse Width Modulator in the process. If the unit
develops power in excess of its requirements, the power LIMIT Comparator effectively monitors this condition and returns
a low signal which disables the Pulse Width Modulator and prevents any further power development.

The PULSE WIDTH Modulator (PWM) is the device which the unit employs to constantly alter the duty cycle of the
switching waveform produced by the FETs. Once reset, it triggers the off-pulse one-shot which turns off the FETs via the
off-pulse driver. The 20KHz entering the PWM holds it reset for 1.5
output is clocked high. This in turn triggers the on-pulse one-shot which enables the FETs. Other inputs which can disable
the PWM are the outputs from the Power Limit Comparator, the Master Enable, the CV and CC loop.

µS and on the next clock pulse from the oscillator the

Figure 4-2 shows the timing diagram of the signals which control the FETs. Notice that on the rising edge of the on-pulse,
the PWM is activated and remains on until the off pulse is sent. There is a slight delay in the time the off-pulse is sent and
the time the FETs are actually turned off. This turn off delay results in greater power being generated than is required as
shown by the Ramp Voltage exceeding the Control Voltage. To prevent this situation, there is an Initial Ramp Circuit
which increases the Ramp Voltage and enables the voltage to ramp up to the Control Voltage level earlier.

The sampled output voltage is fed back through the Constant Voltage Circuit and the Constant Current Circuit before it
becomes the Control Voltage. The CV and CC circuits provide the means for the instrument to deliver power at either
constant voltage or constant current.

The CONSTANT VOLTAGE circuit takes its input from two positions on the output voltage rail: the Innerloop Voltage
Sense (IVS), and the outerloop Voltage Sense (OVS) at the + S and - S terminals. The CV Monitor Amplifier attenuates the
OVS in the ratio of 1:40 (6010A); 1:4 (6011A); 1:12 (6012B); 1:100 (6015A), and produces the Voltage Monitor(V-MON)
signal. This signal connects through protective circuitry to the rear panel and display circuits on the front panel, and also
forms the input to the CV Error Amplifier. The Program Voltage which the user sets at the front panel voltage control is
also an input to this amplifier. The output is the error signal which together with the output from the Innerloop Voltage
Sense (IVS) generates the CV Control Voltage.

In addition to the Front Panel settings, the CV Program Voltage can be set from an external voltage applied between rear
panel terminals VP and

P, or from an external resistor between these same terminals.

48

Figure 4-1. 6010A and 6015A Simplified Schematic

49

50

Figure 4-1. 6011A and 6012B Simplified Schematic

Table 4-1. Quick Reference Guide to Major Circuits

Dependent Circuits

Circuit Major Function Input from Output to Operation

Bias Power
Supply (BPS)

Provides Bias and
Reference Voltage.

Mains Control Circuits Mains voltage at BVS input is

converted to lower voltage levels to
provide the internal operating voltages

for the various circuits.
Bias Voltage
Detector (BVD)

Delays the unit's
operation at power-

BVS Delay Circuit,

OVP

Holds all circuits reset until all internal

voltages are at acceptable levels.

on.
Timed Delay
Circuit (TDC)

Enables power

circuits.

BVD: DOD PWM; Relay Waits for 3 seconds after power-on and

then shuts out inrush current limiting
resistor. The circuit is triggered by the

BVD when the + VDC is stable.
Power Limit
Comparator (PLC)

Determines
maximum primary
current.

BVS; Ramp PWM Compares V

produces a signal to inhibit the PWM

when V

IP RAMP

IP RAMP

> V

with V

REF.

REF

and

Control Voltage
Comparator
(CVC)
Constant Voltage
Circuit (CV)

Constant Current
Circuit (CC)

Pulse Width

Regulates the
operation of the
PWM.
Produces CV
Control Voltage.

Produces CC
Control Voltage.

Switches FETs. Master Enable;

Modulator (PWM)

Primary Current
Monitor

Generates I
Voltage.

Ramp

P

Transformer

Power
Transformer

Stores and transfers
output power.

A4 Q1,2,3,4 Control gating of

current in power,
and Sense

Transformers.
Down
Programmer (DP)

Rapidly lowers

output voltage.

V

IP RAMP

Control

Port Voltage (V

Outer Voltage
Sense (OVS)
Innerloop Voltage

PWM Compares V

)

CP

CVC,
Display
Circuits

with VCP and

IP RAMP

produces a signal to inhibit the PWM
when V
Monitors OVS

> V

IP RAMP

signals from which

CP.

VMON is derived. Combines OVS and

IVS to give CV Control Voltage.
Sense (IVS) CV
Program Voltage
Outer Current
Sense (OCS). CC
Program Voltage

CVC; Display
Circuits

Monitors OCS signals from which

l-MON is derived. Combines OCS and;

differentiated IVS to give the CC

control voltage.

FETs Switching action achieved at 20KHz

PLC, CVC

rate with on-pulse activated by 20KHz

clock and off-pulse by CVC, PLC,

20KHz clock or shutdown circuits.
FETs CVC; PLC Senses Ip current build-up while FETs

are on.

FETs Output Rectifier When FETs are on, the primary

windings of the transformer store

energy until the FETs are switched off

when the energy is transferred to the

secondary for output circuits.
PWM Sensing

Transformer

FETs open and close in response to

pulses from the PWM. The length of its

on/off time depends on the duration of

the PWM on or off pulse.
CV Circuit, OVP,
DOD

Output Rail Output filter capacitor are rapidly

discharged at varying ampere rates

depending on output voltage. Circuit

activated under condition of ac power

loss, shut down or low voltage.

51

Table 4-1. Quick Reference Guide to Major Circuits (continued)

Dependent Circuits

Circuit Major Function Input from Output to Operation

Drop out Detector
(DOD)

Shuts down output
power when line
drops out for more

Bias Transformer PWM; DP If no ac pulse is detected after 20ms,

the circuit inhibits the PWM and

triggers the Down Programmer.

than one cycle.
Over Voltage
Protection (OVP)
Circuit

Limits maximum

output voltage.

+ Out Sense DP; PWM Senses Output Voltage and compares

with a preset limit set by its reference
circuit. It triggers the Down

Programmer in extreme situations.
A9 Output board
(6015A)

Protects output
capacitors and
power mesh from

Power Mesh Output

terminals

Diodes provide protection against

reverse voltage applied across the

output terminals.

reverse voltage.

Figure 4-2. FET Control Signals Timing Diagram

The CONSTANT CURRENT CIRCUIT also produces a control voltage. The outerloop current sense (OCS) is taken across
the current monitoring resistor and the combined signal is amplified by the CC Monitor amplifier to give the outerloop
Current-Sense Voltage, I-MON. This signal is then diverted along two paths: one terminating at the barrier strip while
along the other path the signal combines with the differentiated output of the Innerloop Voltage Sense (IVS). The CC error
amplifier compares this combined output with the user-set CC Program Voltage to produce the CC Control Voltage.

The Control Voltage used to regulate the unit may be derived from either the CV or CC circuit. These circuits are con­nected via a wired-OR connection to the CV or CC circuit. If the CV Control Voltage exceeds the CC Control Voltage then
diode A2CR24 is reversed biased but diode A2CR11 is forward biased and the CC Circuit provides the controlling signal.
Similarly when CC Control Voltage exceeds CV Control Voltage, the CV circuit provides the regulating control voltage.

52

When the unit is operating in CV mode, the CV Control Voltage varies between - 0.5Vdc and + 0.5Vdc. It is most negative
when the load is drawing no power but as power output increases the voltage becomes more positive.

Protection Subsystem

The diverse system configurations and operating environments under which the unit will be required to operate, will
certainly require it to be adequately protected if it must function reliably. The protection circuits of the unit offer protection
at turn-on and also during operation.

The CURRENT LIMIT RESISTORS is the first protection along the power rail which the unit utilizes. This circuit
prevents any surges of AC input to the input filter by limiting the inrush current. After a predetermined elapsed time the
resistor is bypassed and the unit is ready to deliver power. The circuit which carries out this function is the TIMED DELAY

CIRCUIT. When both the Dropout Detector and the

frequency of 1.25KHz begins. After 3 seconds,

Turn-on protection is also offered by the BIAS VOLTAGE DETECTOR (BVD) which prevents spurious operation that
may occur at power-on of the unit if circuits attempt to operate before the + 5Vdc bias voltage is at the clock, PWM, and
logic circuits. After power-on, as the output of the + 5Vdc bias power supply rises the BVD is turned on inhibiting the

Relay Driver and the On-Pulse Driver and creating the power clear signal
unregulated input to the + 5Vdc bias supply is greater than an input voltage sufficient to assure a + 5Vdc output

Certain circuits also give the unit on-going protection during its operation The AC SURGE AND DROPOUT DETECTOR
is such a circuit. This circuit protects the unit from damage from AC mains voltage surges. It shuts down the unit when
there is either a 40% overvoltage or a 20 ms voltage interruption in the ac mains voltage. The mains detect signal senses the
ac mains voltage and pulls the DROPOUT signal low thereby inhibiting the PWM and shutting off the power.

PCLR are high, this delay circuit is enabled and counting at the clock

DROPOUT goes high and enables the PWM.

PCLR . The latter signal is held low until the

During conditions of overvoltage when a monitored fraction of the output voltage exceeds the limit set by the front panel
OVP Adjust, the OVER VOLTAGE PROTECTION circuit inhibits the PWM and triggers the Down Programmer. This
condition persists until the unit is turned off. At power-on, the Bias Voltage Detector resets the OVP.

The DOWN PROGRAMMER is another protection circuit which is activated when any of the following adverse operating
conditions occurs: over voltage; over temperature; primary power failure; and programming of a lower output voltage.
Under these conditions, the Down Programmer lowers the output voltage by rapidly discharging the output filter capacitors.
The Down Programmer takes its input from the Master Enable and the CV Error Amplifier. When either of these signals is
low, it is activated. The + 8.9Vdc bias supply provide enough energy to the Down Programmer to discharge the output
circuit even when primary power is lost.

The TEMPERATURE PROTECTION circuit protects the FETs from excessive temperature gradients. A thermostat
mounted on the FET heat sink monitors the temperature build up of the FETs and disables the PWM when the temperature
exceeds a predetermined limit.

In addition to an over-temperature protection, there is also an OVERVOLTAGE PROTECTION circuit. When the FETs
turn off, the leakage inductance of the power transformer forces current to continue to flow in the primary. Clamp diodes
are employed to protect the FETs from excessive reverse voltage by bypassing the FETs and conducting the current to the
input filter.

Input Power Subsystem

This subsystem forms the interface between the ac mains supply and the switching elements of the unit. It takes ac power
from the mains, converts it to dc and delivers this unregulated dc to the switching elements and internal control circuitry.
Input power takes two distinct pathways to carry out the above function: mains -rectifier/filter--switching elements and
mains--bias supply--control circuits.

53

If the first pathway is taken, it is seen that primary power from the ac mains enters the INPUT RECTIFIER via the inrush
current limiting resistor. The rectifier converts the ac voltage to dc voltage and passes its output to the input filter. The unit
has a feature which allows it to operate either at 110/120 or 220/240Vac mains voltage. The voltage doubling capability as
it is called is effected by connecting jumper AlW1 between the rectifier and filter. When the mains voltage is 220/240Vac,
the jumper is open permitting the filter to develop a typical bus voltage of about 300Vdc. However, when the mains voltage
is 110/1120Vac, the jumper terminals are connected and the rectifier/filter combination now behaves as a voltage doubler
enabling a bus voltage of 300Vdc to be developed .

For the second pathway, primary power passes the Mains Voltage Select Switches to the BIAS POWER SUPPLIES which
provide the operating voltages for the internal circuits. The Mains Voltage Select Switches connect the primary windings of
the Bias-Supplies' transformer for operation at 120, 220, or 240Vdc.

The unit checks that the + 5Vdc bias voltage and the ac mains voltage are within acceptable limits as part of its turn-on
sequence.

DC Power Conversion Subsystem

The current available at the input rails after rectification enters the power transformer A1T2 and Primary Current Monitor
Transformer A1T1. This current flow is controlled by the FETs which act as high frequency switches. The FETs driver
circuits are under the control of the Pulse Width Modulator where the On/Off pulses originate.

During the on-pulse the FETs are turned on and current enters the primaries of transformers A1T1 and A1T2 as described
above. The output rectifiers A5CR4 and A5CR5 (6011A and 6015A) being reversed biased block the flow of current from
the secondary of A1T2 to the output. There is therefore a current build up and the secondary windings of A1T2 act as a
storage device. Meanwhile the current in the secondary of current transformer A1T1 develops a linearly increasing voltage
waveform across resistors A2R116 and A2R117. This waveform is the Ip Ramp Voltage and corresponds to the energy
build up in the secondary of the power transformer.

When the FETs are turned off, the collapsing magnetic field reverses the polarity across the power transformer causing the
output rectifiers to be forward biased. Current therefore flows from the secondary windings to the output filters.

Output Subsystem

As discussed above, power reaches the output rail when the FETs are turned off and the output diodes are forward biased.
The signal is first passed through the first stage of the output filter network where most of its 20KHz ripple derived from
the switching FETs are attenuated. Part of the signal leaving the first stage filter is fed back to the CV and CC Circuits as
the Innerloop Voltage Sense and becomes part of the inner control loop. The primary purpose of these feed-back loops is to
impart sufficient stability to the power supply and enable it to cope with a variety of loads.

The signal from the first stage filter also becomes the input to the second stage capacitor filter which provides the additional
filtering necessary for the unit to meet its specifications. This filter is close to + S and - S output terminals thereby ensuring
that the filter is as close to the user's load as possible. The output from the + S and - S terminals is also fed back to the CV
and CC Circuits and forms part of the outer feedback loop.

The 6015A units contain an A9 output board that provides protection against excessive reverse voltage applied across the
output terminals.

The Front Panel Board

Figure 4-3 is a simplified schematic of the front panel board. The V-MON, I-MON, and OVP signals are passed to the front

54

panel board from the A2 Control Board. The V-MON and I-MON signals are then. amplified by buffer amplifiers before
they are directed to their respective digital voltmeters for display. As an intermediate step before display, the V-MON
signal passes through a pair of bilateral range switches A3U4A and U4D which determine the resolution of the voltage
display. When the voltage to be displayed is below a certain value, the unit selects the low-range bilateral switch A3U4
which enables the voltage to be displayed to an accuracy of two decimal places; however above this critical output voltage
value, the high-range switch A3U4D assumes control and the voltage displayed is accurate to one decimal place.

In addition to providing the display voltage, the V-MON and I-MON signals are used to generate the CV and CC control
voltages respectively. When the CV control voltage is found to be more negative than the Control Port Voltage, the power
supply is operating in the CV Mode and the CV LED lights. Similarly the CC LED lights when the CC Control Voltage is
below the Control Port Voltage confirming that the power supply is operating in CC Mode. When both CV and CC Control
Voltages exceed the Control Port Voltage, the power supply becomes unregulated and the unregulated LED lights.

The CV of CC Program voltages are obtained by depressing the "DISPLAY SETTINGS" switch and reading the respective
display. By depressing this switch and turning the Voltage or Current control, the technician can set the program voltage or
current. If the instrument is operating in CV Mode for example, then the display voltage and the CV Program Voltage are
identical but the display current may vary with the CC Program Voltage. This condition is reversed when the unit is under
CC Mode.

The OVP set potentiometer is also located on the front panel. By depressing the “OVP DISPLAY” switch and adjusting the
pot with a small flat screw-driver, the OVP limit can be set. When the output voltage exceeds this pre-set limit, the unit is
disabled and the OVP LED lights.

55

56

Figure 4-3. Simplified Front Panel Schematic

5

Replaceable Parts

Introduction

This chapter contains information for ordering replacement parts. Table 5-3 lists parts in alpha-numeric order by reference
designators and provides the following information:

Reference Designators. Refer to Table 5-1.

a.
b.

Agilent model in which the particular part is used.

c.

Agilent Part Number.

Description. Refer to Table 5-2 for abbreviations.

d.

Parts not identified by reference designator are listed at the end of Table 5-3 under Mechanical and/or Miscellaneous.

Table 5-1. Reference Designators

AAssembly
BBlower
C Capacitor
CR Diode
DS Signaling Device (light)
FFuse
FL Filter
G Pulse Generator
J Jack
KRelay
L Inductor
Q Transistor
RResistor
RT Thermistor Disc
S Switch
TTransformer
TB Terminal Block
TS Thermal Switch
U Integrated Circuit
VR Voltage Regulator (Zener diode)
W Wire (Jumper)
XSocket*
Y Oscillator

* Reference designator following "X" (e.g. XA2) indicates assembly or device mounted in socket.

57

Ordering Information

To order a replacement part, address order or inquiry to your local Agilent Technolgies sales office. Specify the following
information for each part: Model, complete serial number, and any option or special modification (J) numbers of the
instrument; Agilent part number; circuit reference designator; and description. To order a part not listed in Table 5-3, give a
complete description of the part, its function, and its location.

Table 5-2. Description Abbreviations

ADDR Addressable
ASSY Assembly
AWG American Wire Gauge
BUFF Buffer
CER Ceramic
COMP Carbon Film Composition
CONV Converter
DECODER/DEMULTI Decoder/Demultiplexer
ELECT Electrolytic
EPROM Erasable Programmable Read-Only Memory
FET Field Effect Transistor
FF Flip-Flop
FXD Fixed
IC Integrated Circuit
INP Input
LED Light Emitting Diode
MET Metalized
MOS Metal-Oxide Silicon
OP AMP Operational Amplifier
OPTO Optical
OVP Over Voltage Protection
PCB Printed Circuit Board
PORC Porcelain
POS Positive
PRIOR Priority
ROM Read-Only Memory
RAM Random Access Memory
RECT Rectifier
REGIS Register
RES Resistor
TBAX Tube Axial
TRIG Triggered
UNI Universal
VAR Variable
VLTG REG Voltage Regulator
WW Wire Wound

58

Table 5-3. Replaceable Parts List

Ref. Desig. Agilent Model Agilent Part Number Description

A1 6010A, 6011A 06030-61032 MAIN BOARD ASSEMBLY
A1 6012B 06032-61032 MAIN BOARD ASSEMBLY
A1 6015A 06030-61033 MAIN BOARD ASSEMBLY

B1 All See Chassis Electrical
C1,2, 4-*6,8 All 0180-4528
C9 All 0160-5932
C10 All 0180-3699
C11,12 6010A 0160-6392
C11,12 6011A 0160-5895
C11,12 6012B, 6015A 0160-5933
C13,14 6010A 0180-3702
C13,14 6012B 0180-3492
C13,14 6015A 0180-4204
C15,16 6010A, 6012B 0180-3693
C15,16 6015A 0180-3587
C13-16 6011A 0180-3425
C17,18 6010A, 6012B 0180-0291
C17,18 6011A 0180-3693
C17,18 6015A 0180-4129
*C19 6010A 0160-0260
*C19,20 6011A 0160-0291
*C19 6012B 0160-5286
*C19 6015A 0160-0904
*C20-23 6010A, 6015A 0160-6392
*C20,22 6012B 0160-7732
*C22 6011A 0160-5377
*C23 6011A 0160-7732

fxd elect 1800
fxd poly 0.47
fxd elect 470
fxd poly .047
fxd poly .047
fxd elect .022
fxd elect 1600
fxd elect 2600
fxd elect 900
fxd elect 1000
fxd elect 1000
fxd elect 5500
fxd elect 1

µF 35V

fxd elect 1000
fxd elect 1
fxd cer .047
fxd cer 1
fxd cer .47

µF 35V

µF 20%

µF 35V

µF 20%

fxd ww 0.05
fxd poly .047
fxd poly .47

µF

fxd poly, 2.2
fxd poly, .47

µF 200V

µF 250V

µF 20% 35V

µF 20V
µF

µF 10%

µF 125V-10% +50%
µF 75V

µF 350V

µF 20%
µF 20%
µF 40V

µF 50V

µF 1KV

µF 20%

µF 10% 63V
µF

C24 6010A, 6015A NOT USED
*C24 6012B 0160-4281 fxd met 2200pf 20%
*C25 6010A 0160-0269
*C25 6012B 0160-5286
*C25 6015A 0160-0904
*C25,26 6011A 0160-5377

fxd cer .047
fxd cer .47
fxd ww 0.05
fxd cer 2.2

µF 20%

µF 20%

µF 1KV

µF 10% 63V

C26 6010A, 6015A NOT USED
*C26 6012B 0160-4281 fxd met 2200pf 20%
C27 6011A, 6012B, 6015A 0160-6805

fxd met 0.01

µF 400V

C28 6010A, 6012B See Chassis Electrical
C28 6011A 0160-7732

fxd poly, .47

µF

C28 6015A NOT USED
C29 6010A, 6012B, 6015A 0160-4323

fxd met .047

µF 20% 250VAC

C29 6011A 0160-4281 fxd met 2200PF 20%
C30 6010A See Chassis Electrical

C30,31 6011A NOT USED
C30 6012B, 6015A 0160-4962

C32 6011A 0160-4323
C33 6011A 0160-4962

fxd poly 1.0

fxd met .047
fxd poly 1.0

µF 20%

µF 20% 250V

µF 20%

* Part of output filter (6010A, 5060-3520; 6011A, 5060-3525; 6012B, 5060-3523; 6015A, 5060-3521) which is mounted
on the output bus bars.

59

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

C34 All 0160-6805

fxd met 0.01

µF 400V

CB1 6010A 6012B, 6015A See Chassis Electrical
CR1 All 1901-0731 power rect. 400V
CR2 All 1901-0731 power rect. 400V 1A
CR3,4 All 1901-0050 diode-switching 80V 200ma
CR5 All 1901-0731 Power rect. 400V
CR6-13 All 1901-0731 Power rect. 400V
DS1 All 1990-0517 LED visible
F1 All 2110-0001 fuse 1A 250V
F2 All 2110-0671 fuse .125A 125V
K1,2 All 0490-1834 Relay
L1 All 06012-80003 Snubber wire

9170-0707 ferrite core, (ref. L1)

L2 6010A, 6012B, 6015A 9170-1267 Magnetic core

5080-2040 jumper for L2
L3 6010A 9140-1064 Output Choke
L3 6012B 06012-80095 Output Choke

9170-0721 ferrite core, (ref. L1)
L2,3 6011A 06011-80092 Output Choke
L3 6015A 5080-2131

Ind fxd 18

µH 5A

L4 6010A, 6012B, 6015A See Chassis Electrical
L4 6011A 9170-1267 Magnetic core

5080-2040 jumper for L2
Q1 6010A 1855-0456 MOSFET N-Chan
Q1 6015A 1855-0777 Trans FET N-Ch 600V 3.2A
Q2 All 1855-0665 FET N-Chan
R1-4 All 0811-1866 fxd ww 10K 1% 5W
R5 All 0757-0418 fxd comp 619 1% 1/8W
R7 All 0698-5525 fxd comp 6.8 5% 1/2W
R8 All 0757-0765 fxd comp 36.5K 1% 1/8W
R9 All 0811-3700 fxd ww 20 10% 20W
R10 All 0811-3699 fxd ww 6 10% 20W
R11 6010A, 6015A 5080-2079 current sensing resistor
R11 6012B 06032-80001 current sensing resistor
R11,12 6011A NOT USED
R12,13 6010A, 6012B 0699-0188 fxd film 2.2 5% 1/4W
R12,13 6015A 0698-3492 fxd film 26.1 5% 1/4W
R13 6011A 06011-80001 Current Sensing Resistor
R14,15 6010A, 6015A NOT USED
R14,15 6011A 7175-0057 solid tinned copper wire
R14,15 6012B 0812-0100 fxd ww 2K 5% 5W
R16,17 All 0683-1065 fxd comp 10M 5% 1/2W
R18 All 0757-0921 fxd film 750 1% 1/8W
R19 All 0757-0403 fxd film 121 l% 1/8W
R20-23 6010A, 6012B, 6015A NOT USED
R20,23 6011A 0699-0208 fxd film 1 5% 1/4W
R24 All 0686-2015 fxd comp 200 5% 1/2W
R25-R28 6010A, 6015A NOT USED
R25 6011A, 6012B 0811-1869 fxd ww 30 ohms 3W

* Part of output filter (6010A, 5060-3520; 6011A, 5060-3525; 6012B, 5060-3523; 6015A, 5060-3521) which is mounted
on the output bus bars.

60

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

R29,30 6010A 0811-1887 fxd ww .05 5% 10W
R29,30 6015A 0811-3557 fxd ww 0.5ohms 5% 10W
R31 6010A 0757-0367 fxd film 100K 1% 1/2W
R32 6010A 0686-7535 fxd comp 75K 5% 1/2W
R31,32 6015A 0698-8959 fxd film 619K 1%
R33 6010A 0757-0451 fxd film 24.3K 1% 1/8W
R33 6015A 0757-0471 fxd film 182K 1%
R34 6010A, 6015A 0757-0438 fxd film 5.11K 1% 1/8W
R35 6010A, 6015A 0698-8827 fxd film 1M 1% 1/8W
R36,37 6010A 0811-1909 fxd ww 500 5% l0W
R36,37 6015A 0811-1913 fxd ww 1.5K l0W
R38,39 6010A, 6015A 0757-0467 fxd film 121K 1% 1/8W
R40 6010A, 6015A NOT USED
R41 All 0764-0041 fxd ww 30 5% 2W
R43,44 All 0698-0085 fxd film 2.61K 1% 1/8W
R45 All 0698-8827 fxd film 1M 1% 1/8W
R46 All 0757-0419 fxd film 681 1% 1/8W
R47,48 All 0698-3622 fxd film 120 5% 2W
R49 All 0757-0401 fxd film 100 1% 1/8W
S1 All 3101-2046 switch, DPDT slide
S2 All 3101-1914 switch, 2-DPDT slide
S3 6010A, 6012B, 6015A See Chassis Electrical
T1 All 9100-4350 current transformer
T2 6010A 06030-80090 power transformer
T2 6012B 06032-80090 power transformer
T2 6015A 9100-4827 power transformer
T3 All 9100-4864 bias transformer
U1 All 1906-0218 or

diode bridge

1906-0389
U3 6010A, 6012B, 6015A 1826-0393 IC, volt-reg 1.2/37V
U3 6011A U3 is included with heatsink assembly 5060-

2942, see A1 Mechanical
U4 6015A 1906-0006 diode bridge 400V
U5 6010A, 6015A 1826-0643 IC, switched-mode ckt
U6 All 1990-1074 opto-isolator
VR1 All 1902-0955 diode zener 7.5V 5%

A1 MECHANICAL

6010A, 6012B, 6015A 1205-0282 heatsink (ref. U3)
6011A 5060-2942 heatsink assembly (includes U3)
All 1205-0562 heatsink (ref. U1)
All 21l0-0269 fuse clip (ref. F1)
All 0403-0086 bumper foot (ref. R9,10)
All 06032-60010 output bus bar
All 0340-1095 insulator for buss bar

6015A 2190-0586 lockwasher (ref. U1)
J1 All NOT USED
J2 All 1251-5384 Post-Type Connector,3pin
J3,4 All NOT USED
J5 All 5060-2877 ribbon cable(2inch)(ref.W8)
J6 All 5060-2878 ribbon cable(4inch)(ref.W7)

61

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

J7,8 All 1251-0600 connector, single contact
J9,10, All 1251-5613 connector, single contact
L,N,P
J11-14 All 1251-0600 connector, single contact
XA4,5 All 1252-1052 connector 64pin

A2 6010A 06030-60022 Control Board Assembly
A2 6011A 06011-60022 Control Board Assembly
A2 6012B 06032-60022 Control Board Assembly
A2 6015A 06030-60028 Control Board Assembly

C1-4 All 0160-5422

fxd cer .047

µF 20% 50V

C5 All 0160-4801 fxd cer 100pf 5% 100V
C6-7 All 0160-5422
C8 All 0160-5892

fxd cer .047
fxd poly .22

µF 205 50V
µF 10%

C9 All 0160-5422 fxd cer .047 20% 50V
C10 All 0160-4807 fxd cer 33pf 5% 100V
C11 All 0160-5892

fxd poly .22

µF 10%

C12 All 0160-4830 fxd cer 2200pf 10% 100V
C13-16 All 0160-5422
C17 6010A, 6012B, 6015A 0160-4833
C17 6011A 0160-4832
C18 All 0160-5892
C19 6010A, 6011A, 6012B 0160-5469
C19 6015A 0160-5534
C20 6010A, 6012B, 6015A 0160-5892
C20 6011A 0160-5534
C21,22 All 0160-5422

fxd cer .047
fxd cer .022
fxd cer .01
fxd poly .22
fxd met 1

µF 10% 50V

fxd met .1
fxd poly 22
fxd poly 0.1
fxd cer .047

µF 20% 50V
µF 10% 100V

µF 10% 100V

µF l0%

µF 10% 63V

µF 10%

µF 10% 63V
µF 20% 50V

C23 All NOT USED
C24 6010A, 6012B, 6015A 0160-0162
C24 6011A 0160-0161

fxd poly .022
fxd poly .01

µF 10% 200V

µF 10% 200V

C25 6010A, 6012B, 6015A 0160-4812 fxd cer 220pf 5% 100V
C25 6011A NOT USED
C26 All 0160-4807 fxd cer 33pf 5% 100V
C27 6010A, 6012B, 6015A 0160-5892
C27 6011A 0160-5534
C28 6010A, 6012B, 6015A 0160-4834
C28 6011A 0160-4833
C29 All 0160-5422

fxd poly .22
fxd poly 0.1
fxd cer .047
fxd cer .022
fxd cer .047

µF 10%
µF 10% 63V
µF 10% 100V
µF 10% 100V
µF 20S 50V

C30 All 0160-4807 fxd cer 33pf 5% l00V
C31 All 0160-5422
C32 6010A, 6012B, 6015A 0160-5644
C32 6011A 0160-4832

fxd cer .047
fxd cer .033
fxd cer .01

µF 20% 50V
µF 10% 50V

µF 10% 100V

C33 6010A 0160-4822 fxd cer 1000pf 5% 100V
C33 6011A NOT USED
C33 6012B 0160-4831 fxd cer 4700pf 10% 100V
C33 6015A 0160-4824 fxd cer 680pf
C34 6010A, 6012B, 6015A NOT USED
C34 6011A 0160-4832

fxd cer .01

µF 10% 100V

C35 All 0160-5422 fxd cer .047uf 20% 50V
C36 All 0160-4812 fxd cer 220pf 5% 100V

62

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

C37 6010A, 6011A, 6015A NOT USED
C37 6012B 0160-4830 fxd cer 2200pf 10% 100V
C38-40 All 0160-5422

fxd cer .047

µF 20% 50V

C41 All 0160-4831 fxd cer 4700pf 10% l00V
C42 All 0160-4812 fxd cer 220pf 5% 100V
C43 All 0160-4831 fxd cer 4700pf 10% 100V
C44 All 0160-5422

fxd cer .047

µF 20% 50V

C45 All 0160-4812 fxd cer 220pf 5% 100V
C46 6010A, 6011A, 6012B 0160-5166
C46 6015A 0160-4832
C47 All 0160-5422
C48,49 All 0160-4835
C50 6010A, 6011A, 6012B 0180-0291
C50 6015A 0180-4129
C51 All 0180-1731
C52 All 0180-0230
C53 All 0180-1731
C54 6010A, 6011A, 6012B 0180-0291
C54 6015A 0180-4129
C55 All 0180-0230
C56,57 All 0160-5422

fxd cer .015
fxd cer .01
fxd cer .047
fxd cer .1

µF 10% 50V

fxd elect 1
fxd elect 1
fxd cer 4.7
fxd elect 1
fxd cer 4.7
fxd elect 1
fxd elect 1
fxd elect 1
fxd cer .047

µF 20% 100V

µF 20% 100V

µF 20% 50V

µF 10% 35V
µF 10% 35V

µF l00V

µF 20% 50V

µF 100V
µF 10% 35V
µF 10% 35V
µF 20% 50V

µF 20% 50V

C58 All 0160-4801 fxd cer l00pf 5% l00V
C59 All 0160-4835
C60 All 0160-5422

fxd cer .1

µF 10% 50V

fxd cer .047

µF 20% 50V

C61 All 0160-4812 fxd cer 220pf 5% l00V
C62 All 0160-4835
C63 All 0180-1980
C64 6010A, 6011A, 6012B 0180-0116
C64 6015A 0180-4132
C65 All 0160-5422

fxd cer .1

µF 10% 50V

fxd elect 1
fxd elect 6.8
fxd elect 6.8
fxd cer .047

µF 5% 35V

µF l0% 35V
µF l0% 35V

µF 20% 50V

C66 All 0160-4801 fxd cer 100pf 5% l00V
C67 All 0160-5422

fxd cer .047

µF 20% 50V

C68 All 0160-4822 fxd cer 1000pf 5% 100V
C69,70 All 0160-5422
C71 All 0180-0376
C72 All 0180-2624
C73 All 0180-3407
C74,75 All 0160-5098
C76 All 0160-4835
C77 All 0160-4833
C78 All 0160-4832

fxd cer .047

µF 20% 50V

fxd elect .47
fxd elect 2000
fxd elect 2200
fxd cer .22
fxd cer .1
fxd cer .022
fxd cer .01

µF 10% 50V

µF 10% 50V

µF 10S 100V

µF 10% 100V

µF 10% 35V

µF 10V
µF 35V

C79 All 0160-4830 fxd cer 2200pf 10% 100V
C80 All 0160-4813 fxd cer 180pf 52 l00V
C81 All 0160-5422

fxd cer .047

µF 203 50V

C82 All 0160-4812 fxd cer 220pf 5% l00V
C83 All 0160-5422

fxd cer .047

µF 20% 50V

C84 All 0160-4812 fxd cer 220pf 5% l00V
C85 All 0160-4832

fxd cer .01

µF l0% l00V

63

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

CR1-6 All 1901-0033 gen prp 180V 200ma
CR7,8 All 1901-0050 switching 80V 200ma
CR9,10 All 1901-0033 gen prp 180V 200ma
CR11 All 1901-0050 switching 80V 200ma
CR12 All 1901-0033 gen prp 180V 200ma
CR13,14 All 1901-0050 switching a0V 200ma
CR15,16 All 1901-0033 gen prp 180V 200ma
CR17,18 All 1901-0050 switching 80V 200ma
CR19 All 1901-0033 gen prp 180V 200ma
CR20-31 All 1901-0050 switching 80V 200ma
CR32 All 1901-0992 schottky 40V 3A
L1 All 06023-80090 choke
Q1-3 All 1854-0823 NPN Si
Q4-6 All 1855-0413 J-FET P-chan Si
Q7 All 1854-0823 NPN Si
Q8 All 1853-0012 PNP Si
Q9 6010A, 6012B 1854-0635 NPN Si
Q9 6011A NPN Si (included with heatsink 5060-2944,

see A2 Mechanical)
Q9 6015A 5060-2944 NPN S/HS Assy
Q10 All 1853-0036 PNP Si
Q11 All 1858-0023 transistor array
R1,2 All 0686-5125 fxd comp 5.1K 5% 1/2W
R3 All 0683-5125 fxd film 5.1K 5% 1/4W
R4 All 0757-0483 fxd film 562K 1% 1/8W
R5 All 0683-2015 fxd film 200 5% 1/4W
R6 6010A 0698-6615 fxd film 3.75K .1%
R6 6011A 0699-1011 fxd film 3.32K .1% 1/8W
R6 6012B 0698-7631 fxd film 2.87K .1%
R6 6015A 0757-0424 fxd film 1.1K
R7 All 0683-5125 fxd film 5.1K 5% 1/4W
R8 All 2100-3353 trimmer 20K 10%
R9 6010A, 6011A, 6012B 2100-3352 trimmer 1K 10%
R9 6015A 2100-3351 trimmer 500 ohms
R10 All 0698-3433 fxd film 28.7 1% 1/8W
R11,12 6010A, 6012B, 6015A 0757-0465 fxd film 100K 1% 1/8W
R13 6010A, 6015A 0698-3430 fxd film 21.5 1% 1/8W
R11-13 6011A NOT USED
R13 6012B 0757-0379 fxd film 12.1 1% 1/8W
R14,15 All 0686-5125 fxd comp 5.1K 1/2W
R16 All 0683-2015 fxd film 200 5% 1/4W
R17 All 0698-7082 fxd film 100K 1% 1/8W
R18 6010A, 6011A, 6015A 0683-1025 fxd film 1K 5% 1/4W
R18 6012B 0683-1024 fxd film 1K 5% 1/4W
R19 All 0757-0442 fxd film 10K 1% 1/8W
R20 6010A, 6015A 0686-5135 fxd comp 51K 5% 1/2W
R20 6011A, 6012B 0686-1025 fxd comp 1K 5% 1/2W
R21 6010A, 6015A 2100-3274 trimmer 10K 10%
R21 6011A 2100-3350 trimmer 200 10%
R21 6012B 2100-3273 trimmer 2K 10%
R21 6015A 2100-3274 trimmer 10K 10%

64

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

R22 All 2100-3353 trimmer 20K 10%
R23 All 2100-3273 trimmer 2K 10%
R24 All 2100-3350 trimmer 200 10%
R25 All 2100-3273 trimmer 2K 10%
R26 All 2100-3274 trimmer 10K 10%
R27 All 0157-0470 fxd film 162K 1% 1/8W
R28 All 0757-0464 fxd film 90.9K 1% 1/8W
R29 All 0698-4509 fxd film 80.6K 1% 1/8W
R30 All 0757-0280 fxd film 1K 1% 1/8W
R31 6010A, 6011A, 6012B 0698-3260 fxd film 464K 1% 1/8W
R31 6015A 0757-0471 fxd film 182K 1%
R32 All 0698-8827 fxd film 1M 1% 1/8W
R33 All 0698-3449 fxd film 28.7K 1% 1/8W
R34 6010A, 6012B, 6015A 0757-0458 fxd film 51.1K 1% 1/8W
R34 6011A 0757-0442 fxd film 10K 1% 1/8W
R35 6010A, 6015A 0683-l055 fxd film 1M 5% 1/4W
R35 6011A 0683-3355 fxd film 3.3M 5% 1/4W
R35 6012B 0683-l555 fxd film 1.5M 5% 1/4W
R36 All 0698-3455 fxd film 261K 1% 1/8W
R37,38 6010A, 6011A, 6015A 0698-4536 fxd film 340K 1% 1/8W
R37 6012B 0698-4536 fxd film 340K 1% 1/8W
R38 6012B 0698-3455 fxd film 261K 1% 1/8W
R39 All 0683-4725 fxd film 4.7K 5% 1/4W
R40 6010A 0699-1210 fxd film 80K .1% .1W
R40 6011A NOT USED
*R40 6015A 111.1K and 2M in parallel
R41 6010A 0699-1744 fxd film 280K 1% .1W
R41 6011A 0699-0118 fxd film 20K .1% .1W
R41 6015A 0699-3104 fxd film 250K 0.1%
R40,41 6012B 0699-1210 fxd film 80K .1% .1W
R42 6010A, 6015A 0699-1742 fxd film 70K .1% .1W
R42 6011A 0699-0059 fxd film 5K .1% .1W
R42 6012B 0699-0642 fxd film 10K .1% .1W
R43 6010A, 6015A 0699-1743 fxd film 345K .1% .1W
R43 6011A 0699-0118 fxd film 20K .1% .1W
R43 6012B 0699-1211 fxd film 95K .1% .1W
R44 All 0757-0199 fxd film 21.5K 1% 1/8W
R45 All 0698-8816 fxd film 2.15 1% 1/8W
R46 6010A, 6012B, 6015A 0683-1255 fxd film 1.2M 5% 1/4W
R46 6011A 0698-4359 fxd film 402K 1% 1/8W
R47 6010A, 6012B, 6015A 0757-0470 fxd film 162K 1% 1/8W
R48 6010A, 6012B, 6015A 0757-0458 fxd film 51.1K 1%
R47,48 6011A 0757-0458 fxd film 51.1K 1%
R49 6010A 0699-1745 fxd film 560K .1% 1/4W
R49 6011A jumper (see W1-3)
R49 6012B 0698-7496 fxd film 20K .1% 1/4W
**R49 6015A 5060-3404 2M(two 1M in series)

*R40 is comprised of two 1% fixed film resistors, 11.1K (0698-6979) and 2M (0683-2055), assembled in parallel.
** R49 is comprised of two 1M 1% fixed film resistors (0698-6369) assembled in series.

65

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

R50 6010A, 6015A 0686-5135 fxd film 51K 5% 1/2W
R50 6011A, 6012B 0686-1025 fxd film 1K 5% 1/2W
R51 6010A, 6012B, 6015A jumper (see W1-3)
R51 6011A 0698-3433 fxd film 28.7 1% 1/8W
R52 6010A, 6015A 0699-1742 fxd film 70K .1% .1W
R52 6011A 0699-0059 fxd film 5K .1% .1W
R52 6012B 0699-0642 fxd film 10K .1% .1W
R53 6010A, 6015A 0757-0451 fxd film 24.3K 1% 1/8W
R53 6011A 0757-0462 fxd film 75K 1% 1/8W
R53 6012B 0757-0458 fxd film 51.1K 1% 1/8W
R54 All 0698-3450 fxd film 42.2K 1% 1/8W
R55 6010A, 6015A 0757-0451 fxd film 24.3K 1% 1/8W
R55 6011A 0757-0462 fxd film 75K 1% 1/8W
R55 6012B 0757-0458 fxd film 51.1K 1% 1/8W
R56 6010A, 6012B, 6015A 0757-0199 fxd film 21.5K 1% 1/8W
R56 6011A jumper (see W1-3)
R57 6010A, 6011A, 6012B 0698-3155 fxd film 4.64K 1% 1/8W
R57 6015A 0757-0124 fxd film 39.2K 1% 1/8W
R58 6010A 0757-0344 fxd film 1M 1% 1/8W
R58 6011A 0757-0449 fxd film 20K 1% 1/8W
R58 6012B 0698-3572 fxd film 60.4K 1% 1/8W
R58 6015A 0699-1630 fxd film 4M
R59,60 6010A 0698-4486 fxd film 24.9K 1% 1/8W
R59,60 6011A 0698-0442 fxd film 10K 1% 1/8W
R59,60 6012B 0757-0438 fxd film 5.11K 1% 1/8W
R59,60 6015A 0698-7668 fxd film 39.91K 1%
R61 6010A 0757-0344 fxd film 1M 1% 1/4W
R61 6011A 0757-0449 fxd film 20K 1% 1/4W
R61 6012B 0698-3572 fxd film 60.4K 1% 1/8W
R61 6015A 0699-1630 fxd film 4M
R62 All 0757-0124 fxd film 39.2K 1% 1/8W
R63 All 0683-l015 fxd film 100 5% 1/4W
R64 6010A, 6012B, 6015A 0757-0124 fxd film 39.2K 1% 1/8W
R64 6011A 0757-0270 fxd film 249K 1% 1/8W
R65 6010A, 6011A, 6015A NOT USED
R65 6012B 0757-0473 fxd film 221K 1% 1/8W
R66 All 0683-4725 fxd film 4.7K 5% 1/4w
R67 6010A, 6015A NOT USED
R67 6011A 0757-0459 fxd film 56.2K 1% 1/8W
R67 6012B 0757-0123 fxd film 34.8K 1% 1/8W
R68 All 0757-0270 fxd film 249K 1% 1/8W
R69 All 0683-1015 fxd film 100 5% 1/4W
R70 All 0757-0449 fxd film 20K 1% 1/8W
R71 All 0698-0085 fxd film 2.61K 1% 1/8W
R72 All 0757-0452 fxd film 27.4K 1% 1/8W
R73 6010A, 6015A 0757-0289 fxd film 13.3K 1% 1/8W
R73 6011A 0757-0442 fxd film 10K 1% 1/8W
R73 6012B 0757-0461 fxd film 68.1K 1% 1/8W
R74 All 0757-0460 fxd film 61.9K 1% 1/8W
R75 All 0698-8827 fxd film 1M 1% 1/8W
R76 All 0757-0438 fxd film 5.11K 1% 1/8W

66

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

R77 All 0683-4715 fxd film 470 5% 1/4W
R78 All 0698-6322 fxd film 4K 1% 1/8W
R79,80 All 0683-2035 fxd film 20K 5% 1/4W
R81 6010A, 6012B, 6015A 0757-0419 fxd film 681 1% 1/8W
R81 6011A 0698-3444 fxd film 316 1% 1/8W
R82 All 0683-4715 fxd film 470 5% 1/4W
R83 All 0698-6322 fxd film 4K 1% 1/8W
R84 All 0698-6320 fxd film 5K .1% 1/8W
R85 All 0698-6983 fxd film 20.4K .1% 1/8W
R86 All 0757-0465 fxd film 100K 1% 1/8W
R87 6010A, 6012B 0698-7933 fxd film 3.83K .1% 1/8W
R87 6011A 0698-6322 fxd film 4K 1% 1/8W
R87 6015A 0699-2850 fxd film 10.01K 0.1% 25PM
R88 6010A 0699-1745 fxd film 500 .1% 1/8W
R88 6011A 0698-8695 fxd film 36K .1% 1/8W
R88 6012B 0698-6979 fxd film 111.1K .1% 1/8W
*R88 6015A 5060-3405 2.5M (two 1.25M in series)
R89-91 All 0683-2225 fxd film 2.2K 55 1/4W
R92 6010A, 6015A 0898-4480 fxd film 15.8K 1% 1/8W
R92 6011A 0757-0457 fxd film 47.5K 1% 1/8W
R92 6012B 0757-0464 fxd film 90.9K 1% 1/8W
R93 All 0683-3325 fxd film 3.3K 5% 1/4W
R94,95 All 0683-2225 fxd film 2.2K 5% 1/4W
R96 All 0757-0481 fxd film 475K 1% 1/8W
R97 All 0757-0290 fxd film 6.19K 1% 1/8W
R98 All 0757-0444 fxd film 12.1K 1% 1/8W
R99 All 0698-4416 fxd film 169 1% 1/8W
R100 All 0757-0404 fxd film 130 1% 1/8W
R101 All 0698-4608 fxd film 806 1% 1/4W
R102 All 0698-4447 fxd film 280 1% 1/8W
R103 All 0698-4416 fxd film 169 1% 1/8W
R104,105 All 0683-4725 fxd film 4.7K 5% 1/8W
R106 6010A, 6015A 0757-0404 fxd film 130 5% 1/8W
R106 6010A, 6011A, 6012B 0683-2715 fxd film 270 5% 1/4W
R107 All 0683-1815 fxd film 180 5% 1/4W
R108 All 0683-2715 fxd film 270 5% 1/4W
R109 All 0683-1815 fxd film 180 5% 1/4W
R110 All 0683-5105 fxd film 51 5% 1/4W
R111 All 0683-2035 fxd film 20K 5% 1/4W
R112 All 0757-0199 fxd film 21.5K 1% 1/8W
R113 All 0757-0283 fxd film 2K 1% 1/8W
R114 All 0683-2225 fxd film 2.2K 5% 1/4W
R115 All 0757-0280 fxd film 1K 1% 1/8W
R116,117 All 0757-0346 fxd film 10 1% 1/8W
R118 All 0698-3498 fxd film 8.66K 1% 1/8W
R119 All 0757-0438 fxd film 5.11K 1% 1/8W
R120 All 0683-4725 fxd film 4.7K 5% 1/4W
R121 All 0683-2025 fxd film 2K 5% 1/4W
R122 All 0683-1025 fxd film 1K 5% 1/4W
R123 All 0683-4715 fxd film 470 5% 1/4W
R124 All 0757-0442 fxd film 10K 1% 1/8W
* R88 is comprised of two 1.25M 0.1% fixed film resistors (0698-6950) assembled in series.

67

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

R125 All 0757-0465 fxd film 100K 1% 1/8W
R126 All 0757-0442 fxd film 10K 1% 1/8W
R127 All 0698-8827 fxd film 1M 1% 1/8W
R128 All 0698-3136 fxd film 17.8k 1% 1/8W
R129 All 0698-4121 fxd film 11.3K 1% 1/8W
R130 6010A, 6015A NOT USED
R131 All 0757-0449 fxd film 20K 1% 1/8W
R132 All 1810-0205 resistor network
R133 All 0683-5625 fxd film 5.6K 5% 1/4W
R134 All 0683-1025 fxd film 1K 5% 1/4W
R135 All 0683-1855 fxd film 1.8M 5% 1/4W
R136 All 0757-0420 fxd film 750 1% 1/4W
R137 All 0698-4435 fxd film 2.49K 1% 1/8W
R138 All 0757-0199 fxd film 21.5K 1% 1/8W
R139 All 0683-4725 fxd film 4.7K 5% 1/4W
R140 All 0683-2025 fxd film 2K 5% 1/4W
R141 All 0683-5135 fxd film 51K 5% 1/4W
R142 All 0683-6835 fxd film 68K 5% 1/4W
R143 All 0683-4725 fxd film 4.7K 52 1/4W
R144 All 0757-0415 fxd film 475 1% 1/8W
R145 All 0683-1005 fxd film 10 52 1/4W
R146 All 0683-1035 fxd film 10K 52 1/4W
R147 All 0683-5115 fxd film 510 5% 1/4W
R148 All 0757-0422 fxd film 909 1% 1/8W
R149 All 0683-2025 fxd film 2K 5% 1/4W
R150 6010A, 6015A 0754-0404 fxd film 130 5% 1/4W
R150 6011A, 6012B 0683-2715 fxd film 270 5% 1/4W
R151 All 0683-4725 fxd film 4.7K 5% 1/4W
R152 All 0757-0442 fxd film 10K 1% 1/8W
R153 All 0757-0443 fxd film 11K 1% 1/8W
R154 All 0757-0451 fxd film 24.3K 1% 1/8W
R155 All 0757-0444 fxd film 12.1K 1% 1/8W
R156 All 0683-4725 fxd film 4.7K 5% 1/4W
R157 All 0683-1005 fxd film l0 52 1/4W
R158 All 0686-2005 fxd comp 20 5% 1/2W
R159,160 All 0686-6215 fxd comp 620 5% 1/2W
R161 All 0757-0283 fxd film 2K 1% 1/8W
R162 All 0757-0442 fxd film l0K 1% 1/8W
R163 All 0757-0283 fxd film 2K 1% 1/8W
R164 All 0757-0434 fxd film 3.65K 1% 1/8W
R165 All 0683-1035 fxd film 10K 5% 1/4W
R166,167 All 0686-1315 fxd comp 130 5% 1/2W
R168 All 0683-1515 fxd comp 150 5% 1/4W
R169 All 0757-0124 fxd film 39.2K 1% 1/8W
R170 All 0698-3136 fxd film 17.8K 1% 1/8W
R171 All 0757-0280 fxd film 1K 1% 1/8W
R172 All 0811-3174 fxd WW .07 5% 5W
R173 All 0683-2225 fxd film 2.2K 5% 1/4W
R174 All 0683-3625 fxd film 3.6K 5% 1/4W
R175 All 0683-1525 fxd film 1.5K 55 1/4W
R176 All 0683-2225 fxd film 2.2K 5% 1/4W

68

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

R177 All 0683-0335 fxd film 3.3 5% 1/4W
R178,179 All 0683-4725 fxd film 4.7K 5% 1/4W
R180 All 0683-l045 fxd film 100K 5% 1/4W
R181 All 0683-3335 fxd film 33K 5% 1/4W
R182 All 0698-8827 fxd film 1M 1% 1/8W
S1 All 3101-2097 switch (6) 1A
U1-3 All 1826-0493 IC op-amp
U4,5 All 1826-0161 IC op-amp
U6 All 1826-0346 IC op-amp
U7 All 1826-0544 IC voltage regulator
U8 All 1826-0138 IC voltage reg. Dual trkg.
U9 All 1820-0935 IC counter CMOS
U10 All 1826-0065 IC comparator
U11 6010A, 6012B 1826-0393 IC voltage regulator
U11 6011A IC voltage regulator (incorporated into

heatsink assy 5060-2942, see A2

Mechanical)
U11 6015A 5060-2942 IC volt reg/HS assy
U12 6010A, 6012B 1826-0527 IC voltage regulator
U12 6011A IC voltage regulator (incorporated into

heatsink assy 5060-2943, see A2

Mechanical)
U12 6015A 5060-2943 IC volt reg/HS assy
U13 All 1820-1287 IC buffer TTL LS
U14 6010A, 6015A NOT USED
U14 6011A, 6012B Correct Designation is

Q11
U15 All 1820-1272 IC buffer TTL LS
U16 All 1820-1437 IC multivibrator TTL LS
U17 All 1826-0138 IC comparator
U18 All 1820-1205 IC gate TTL LS
U19 All 1820-1112 IC flip flop -type
U20 All 1820-2096 IC counter TTL LS
U21 All 1826-0544 IC voltage reg
U22 All 1826-0428 IC voltage regulator
U23 All 1826-0065 IC comparator
VR1 All 1902-3110 zener 5.9V 2%
VR2 All 1902-0777 zener 6.2V
VR3,4 All 1902-0018 zener 6.8V
VR5 All 1902-0575 zener 6.5V 2S
VR6 All jumper (see W1-3)
W1-3

6010A, 6012B, 6015A 7175-0057 jumper
(R51,VR6)
W1-3 (R49,

6011A 7175-0057 jumper
R51, VR6)
Y1 6010A, 6011A, 6015A 0960-0586 resonator- cer
Y1 6012B, 6015A 1960-0586 resonator- cer

A2 MECHANICAL

6010A, 6012B, 6015A 1205-0282 heat sink (Q9,U11,U12)

6011A 5060-2942 heatsink assy (includes U11)

6011A 5060-2943 heatsink assy (includes U12)

6011A 5060-2944 heatsink assy (includes Q9)

69

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

All 1200-0485 IC socket (S1)

All 1200-0181 insulator, (Q8)
J1,2 All 1251-8417 connector 16-pin
J3 All 1251-7743 connector 26-pin
J4 All 1251-8676 connector 5-pin
J5,6 All 1251-5240 connector 20-pin
J15 All 1251-0600 connector 1-pin
TB1 All 0360-2195 barrier block 6-pos.
TB2 All 0360-2192 barrier block 2-pos.

A3 6010A 06010-60020 Front Panel Board
A3 6011A 06011-60020 Front Panel Board
A3 6012B 06012-60036 Front Panel Board
A3 6015A 06010-60023 Front Panel Board

C1 All 0160-5893
C2 All 0160-0168
C3 All 0160-4835
C4-6 All 0160-5422

fxd plyprpln .047
fxd poly 0.1
fxd cer 0.1
fxd cer .047

µF 10% 200V

µF 10% 50V

µF 20% 50V

µF 10% 100V

C7 All NOT USED
C8 All 0160-5893
C9 All 0160-0168
C10 All 0160-4835
C11 All 0160-5422

fxd plyprpln .047
fxd poly 0.1
fxd cer 0.1
fxd cer .047

µF 10% l00V

µF 10% 50V

µF 20% 50V

µF 10% 100V

C12 All NOT USED
C13 All 0160-4835
C14 All 0160-5422

fxd cer 0.1
fxd cer .047

µF l0% 50V

µF 20% 50V

C15 All 0160-4831 fxd cer 4700pf l0% l00V
C16 All 0160-4807 fxd cer 33pf 5% l00V
C17-19 All 0160-5422

fxd cer .047

µF 20% 50V

CR1,2 All 1901-0050 photoswitch IF=350ma VAX=15V
CR3-5 All 1901-0033 diode gen prp 180V 200ma
DS1-8 All 1990-0985 display kit
DS9,10 6010A, 6015A 1990-0995 led green IF=30ma BVR=5V
DS9,10 6011A, 6012B 1990-0521 led green IF=30ma BVR=5V
DS11-13 6010A, 6015A 1990-0895 led yellow IF=20ma BVR=5V
DS11-13 6011A, 6012B 1990-0524 led yellow IF=20ma BVR=5V
R1-17 All 0683-2015 fxd film 200 5% 1/4W
R18 All 0698-3456 fxd film 287K 1% 1/8W
R19-37 All 0683-2015 fxd film 200 5% 1/4W
R38 All 0683-1045 fxd film 100K 5% 1/4W
R39 All NOT USED
R40-44 All 0683-2015 fxd film 200 5% 1/4W
R45 All 0698-3456 fxd film 287K 1% 1/8W
R46-54 All 0683-2015 fxd film 200 5% 1/4W
R55 All 0683-1045 fxd film 100K 5% 1/4W
R56 6010A 0698-8871 fxd film 953 1% 1/8W
R56 6011A 0698-6348 fxd film 3K 1% 1/8W
R56 6012B, 6015A 0698-6362 fxd film 1K .1% 1/8W
R57 All NOT USED

70

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

R58 6010A 0698-0533 fxd film 4.64K 0.1% 1/8W
R58 6011A 0698-6392 fxd film 22K 0.1% 1/8W
R58 6012B, 6015A 0699-1212 fxd film 19K 0.1% 1/8W
R59 All 0683-6215 fxd film 620 52 1/4W
R60-62 All 0683-2015 fxd film 200 5% 1/4W
R63 All 0683-5125 fxd film 5.1K 5% 1/4W
R64 All 0683-1025 fxd film 1K 5% 1/4W
R65,66 6010A, 6011A, 6012B 0683-5615 fxd film 560 5% 1/4W
R65,66 6015A 0683-3201 fxd film 560 5% 1/4W
R67 6010A, 6011A 0757-0449 fxd film 20K 1% 1/8W
R67 6012B 0757-0453 fxd film 30.1K 1% 1/8W
R67 6015A 0757-5615 fxd film 20K 1% 1/8W
R68 6010A, 6011A, 6015A 0698-3201 fxd film 80K 1% 1/8W
R68 6012B 0757-0449 fxd film 20K 1% 1/8W
R69 6010A, 6011A, 6015A 0757-0442 fxd film 10K 1% 1/8W
R70 6010A, 6011A 0698-7353 fxd film 19K 1% 1/8W
R70 6012B 0698-4493 fxd film 34K 1% 1/8W
R70 6015A 0698-6671 fxd film 7K 0.25% 1/8W
R71 6010A, 6011A, 6015A 0757-0280 fxd film 1K 1% 1/8W
R71 6012B 0698-3476 fxd film 6K 1% 1/8W
R72 All 0698-6362 fxd film 1K 0.1% 1/8W
R73 All 0757-0452 fxd film 27.4K 1% 1/8W
R74 All NOT USED
R75 All 0683-5135 fxd film 51K 5% 1/4W
R76 All 0757-0441 fxd film 8.25K 1% 1/8W
R77 6010A, 6011A, 6012B 0698-3159 fxd film 26.lK 1% 1/8W
R77 6015A NOT USED
R78 All 0757-0458 fxd film 51.1K 1% 1/8W
R79 All 0683-1025 fxd film 1K 5% 1/4W
R80 All 0683-5135 fxd film 51K 5% 1/4W
R81 All 0683-3025 fxd film 3K 5% 1/4W
R82 All 0683-1025 fxd film 1K 5% 1/4W
R83 6010A 0698-6363 fxd film 9K 0.1% 1/8W
R83 6011A, 6012B 0698-6343 fxd film 9K 0.1% 1/8W
R83 6015A 0698-6322 fxd film 4K 0.1%
R84 6010A 0698-6563 fxd film 40K 0.1% 1/8W
R84 6011A 0698-6363 fxd film 40K 0.1% 1/8W
R84 6012B 0698-8861 fxd film 6.66K 0.1% 1/8W
R84 6015A 0699-1211 fxd film 95K 0.1%
R85 All 0757-0438 fxd film 5.11K 1% 1/8W
R86 All 0683-5135 fxd film 51K 5% 1/4W
R87 All 0757-0199 fxd film 21.5K 1% 1/8W
R88 All 0683-3925 fxd film 3.9K 5% 1/4W
R89 All 0698-5808 fxd film 4K 1% 1/8W
R90 All 0686-6815 fxd comp 680 5% 1/2W
R91 All 0757-0452 fxd film 27.4K 1% 1/8W
R92 All NOT USED
R93 All 0683-2025 fxd film 2K 5% 1/4W
R94 All 0757-0280 fxd film 1K 1% 1/8W
R95 All 0683-l035 fxd film 10K 5% 1/4W
R96 All 0683-5125 fxd film 5.1K 5% 1/4W

71

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

R97 All 2100-1775 var. ww. trimmer 5K 5%
R98 6010A, 6012B, 6015A 0698-4457 fxd film 576 ohms 1% 1/8W
R98 6011A 0757-0415 fxd film 475 1% 1/8W
R99,100 All See Chassis Electrical
S1,2 All 5060-9436 switch, rockerarm
U1,2 All 1826-0876 IC Converter A/D CMOS
U3 All 1820-1144 IC NOR Gate TTL LS Quad
U4 All 1826-0502 Analog Switch, 4SPST, 14pin dip
U5 All 1826-0138 IC Comparator, quad, 14pin dip
U6 All 1826-0493 IC Op Amp, Low-Bias-Hi-Impd.
U7 All 1826-0346 IC Op Amp, gen. purpose
U8 All 1826-0502 Analog Switch, 4SPST, 14pin dip
VR1 All 1902-3092 diode, zener, 4.99V 2%
VR2 All 1902-0064 diode, zener, 7.5V 5%
W1 All 8159-0005 res. 0 ohms
W2,4 All 7175-0057 jumper, solid tinned copper
W2,3 6011A, 6012B 7175-0057 jumper, solid tinned copper
W3,5-7 6010A, 6015A NOT USED
W5 6011A, 6012B NOT USED
W6,7 6011A, 6012B 7175-0057 jumper, solid tinned copper
W8 6010A 7175-0057 jumper, solid tinned copper
W8 6015A NOT USED

A3 MECHANICAL

J3 All 1251-5055 Connector Post Type

6010A, 6015A 5041-0309 key cap (ref. S1,S2)

6011A, 6012B 4040-2121 Plastic-misc (ref. DS9-13)

A4 All 06011-60023 FET Board

C1 All 0160-4569 fxd poly .01uf 10S% 800Vdc
C2 All 0160-5981
C3 All 0160-4569
C4 All 0160-5981
C5,6 All 0160-4835
C7 6010A, 6011A, 6012B 0180-0116
C7 6015A 0180-4132
C8 All 0130-0228
**CR1 6010A, 6011A, 6012B 1901-1418 diode rect. /HA assy
CR1 6015A 5060-9667 diode rect. /HA assy
CR2,3 All 1901-1087 pwr rect. 600V
**CR4 All 1901-1418 diode rect. /HA assy
CR6-11 All 1901-0050 diode-switching 80V 200ma
F1,2 All 2110-0671 fuse .125A 125V
L1-4 All 9100-1610
Q1-4 All 1855-0473 MOS FET N chan.
Q5,6 All 1854-0585 NPN Si
R1-4 All 0811-1065 fxd ww 0.2 5% 1/2W
R5-8 All 0698-3609 fxd met 22 5% 1/2W
** If either diode needs replacement, replace both diodes.

fxd poly .047µF 10% 630Vdc
fxd poly .01µF 10% 800Vdc
fxd poly .047µF 10% 630Vdc
fxd cer .1µF 10% 50V
fxd elect 6.8µF 10% 35V
fxd elect 6.8µF 10% 35V
fxd elect 22µF 10% 15V

coil 150µH 20%

72

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

R9-11 All 0698-5139 fxd comp 3.9 5% 5W
R12 All 0757-0466 fxd film 110K 1% 1/8W
R13-16 All 0698-3609 fxd met 22 5% 2W
R17-19 All 0698-5139 fxd comp 3.9 5% .5W
R20 All 0757-0379 fxd film 12.l 1% 1/8W
R21 All 0683-1505 fxd film 15 5% 1/4W
R22 All 0683-1815 fxd film 180 5% 1/4W
R23,24 All 0686-2005 fxd comp 20 5% 1/2W
R25 All 0757-0466 fxd film 1l0K 1% 1/8W
R26 All 0683-1815 fxd film 180 5% 1/4W
R27 All 0757-0379 fxd film 12.1 1% 1/8W
R28 All 0683-1505 fxd film 5% 1/4W
R29-33 All 0683-0475 fxd film 4.7 5% 1/4W
R34 All 0683-0275 fxd film 2.7 5% 1/4W
TS1 All 3103-0081 switch-therm +202F
T1 All 06011-80091 Transformer
T2 All 06011-80095 Transformer
U1-3 All 1820-l050 DRVR TTL NOR DUAL
VR1,2 All 1902-0779 zener 11.8V 5%

A4 MECHANICAL

6010A, 6012B 1205-0398 heatsink (ref. CR1,4)

All 1252-0093 socket pin (ref. Q1-4)

All 06032-20001 heatsink (ref. Q1,Q2)

All 06032-20002 heatsink (ref. Q3,Q4)

All 0380-1524 standoff (8mm)
P1 All 1252-1053 connector 64-pin

A5 6010A 06030-60024 Diode Board
A5 6011A 06011-60024 Diode Board
A5 6012B 06032-60029 Diode Board
A5 6015A 06030-60029 Diode Board

C1 6010A, 6012B, 6015A 0180-3167
C1 6011A 0160-4832
C2 6010A 0160-5464
C2 6011A 0160-5422
C2 6012B 0160-4569
C2 6015A 0160-7222
C3 6010A, 6012B, 6015A 0160-5422
C3 6011A 0180-3167
C4 6010A, 6012B 0160-4832
C4 6015A 0160-4835
C4,5 6011A 0160-6077
C5 6010A 0160-5464
C5 6015A 0160-7222

fxd elect 1000
fxd cer .01
fxd poly .01
fxd cer .047
fxd poly .01
fxd poly .0022
fxd cer .047
fxd cer 1000
fxd cer .01
fxd cer .01

µF 20% 25V

µF 10% 100V

µF 5% 1.5KVdc
µF 20% 50Vdc
µF 10% 800Vdc

µF 1600Vdc

µF 20% 50Vdc

µF 25Vdc
µF 10% 100Vdc
µF

fxd poly pr 0.015
fxd poly .01
fxd poly .0022

µF 5% 1.5KVdc

µF 1600Vdc

µF 200V

C6 6010A see chassis electrical
C7 6015A 0160-5166

fxd cer 0.015

µF 100V

CR1 6010A, 6012B, 6015A 1901-0050 diode-switching 80V 200ma
CR1 6011A 5080-2068 rectifier matched pair (with CR5)
CR2 6010A, 6012B, 6015A 1901-0731 pwr rectifier 400V 1A

73

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

CR3 6010A, 6012B, 6015A 1901-0050 diode-switching 80V 200ma
CR2,3 6011A 1901-0050 diode-switching 80V 200ma
CR4,5 6010A 1901-1542 pwr rectifier 400V 50A
CR4,5 6015A 1901-1388 diode pwr rectifier
CR4 6011A 1901-0731 pqr rectifier 400V 1A
CR4 6012B 1901-1182 pqr rectifier 300V 50A
CR5 6011A 5080-2068 rectifier matched pair (with CR1)
CR6 6010A, 6015A 1902-3203 diode 14.7V 5% 400mW
F1 6010A NOT USED
F1 6011A 2110-0699 fuse 5A 125V (axial)
F1 6012B 2110-0546 fuse 5A 125V (axial)
L1,2 6010A 9170-1334 ferrite core for L1,2
L1,2 6011A 9170-1272 core-magnetic ferrite
L1,2 6015A 5080-2132 inductor
L1 6012B 06012-80003 snubber wire

9170-0707 ferrite core for L1
L3 6010A, 6015A 9170-0894 core-shield bead (ref. Q1)
Q1 6010A, 6015A 1855-0767 MOS FET N chan
Q1 6011A 1854-0264 NPN Si
Q1 6012B 1855-0549 MOS FET N chan
Q2 6011A 1855-0549 FET N-CHAN
Q2 6012B 1854-1070 NPN Si
R1 6010A, 6012B, 6015A 0683-1855 fxd film 1.8M 5% 1/4W
R1 6011A 0811-3460 fxd ww 0.05 5% 5W
R2 6011A 0686-1005 fxd comp 10 5% 1/2W
R2 6010A, 6012B, 6015A 0698-3151 fxd film 2.87K 1% 1/8W
R3 6010A, 6012B 0757-0459 fxd film 56.2K 1% 1/8W
R3 6011A 0683-1025 fxd film 1K 5% 1/8W
R3 6015A 0757-0459 fxd film 56.2K 1% 1/8W
R4 6010A, 6012B 0698-3202 fxd film 1.74K 1% 1/8W
R4 6011A 0757-0317 fxd film 1.33K 1% 1/8W
R4 6015A 0698-3202 fxd film 1.74K 1% 1/8W
R5 6010A, 6012B, 6015A 0757-0317 fxd film 1.33K 1% 1/8W
R5 6011A 0698-4196 fxd film 1.07K 1% 1/8W
R6 6010A, 6012B, 6015A 0683-l045 fxd film 100K 5% 1/4W
R6 6011A 0698-4211 fxd film 158K 1% 1/8W
R7 6010A, 6015A 0683-2735 fxd film 5% 1/4W
R7 6011A 0757-0465 fxd film 100K 1% 1/8W
R7 6012B 0683-1025 fxd film 1K 5% 1/8W
R8 6010A, 6012B, 6015A 0698-7332 fxd film 1M 1% 1/8W
R8 6011A 0757-0447 fxd film 16.2K 1% 1/8W
R9 6010A 0698-8144 fxd film 787K 1% 1/8W
R9 6011A 0757-0428 fxd film 1.62K 1% 1/8W
R9 6012B 0757-0480 fxd film 432K 1% 1/8W
R9 6015A 0683-2055 fxd film 2M 5%
R10 6010A, 6015A 0698-3512 fxd film 1.13K 1% 1/8W
R10 6012B 0698-4196 fxd film 1.07K 1% 1/8W
R10,11 6011A 0698-3601 fxd film 10 5% 2W
R11 6010A, 6015A NOT USED
R11 6012B 0686-1005 fxd comp 10 5% 1/2W

74

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

R12 6010A, 6015A 0757-0447 fxd film 16.2K 1% 1/8W
R12,13 6011A 0698-3609 fxd met 22 5% 2W
R13 6010A, 6012B, 6015A 0683-1005 fxd film 10 5% 1/4W
R14 6010A 0811-1746 fxd ww .36 5% 2W
R14 6011A 0757-0459 fxd film 56.2K 1% 1/8W
R14 6012B 0811-3290 fxd ww .1 5% 2W
R14 6015A 0811-0923 fxd ww 0.91ohms 2W
R15-18 6010A 0811-3729 fxd ww 250 5% 10W
R15-18 6015A 0811-3842 fxd ww 600 ohms 10W
R15 6011A 0683-1855 fxd film 1.8M 5% 1/4W
R15 6012B 0811-1068 fxd ww 50 5% 10W
R16 6011A 0698-7332 fxd film 1M 1% 1/8W
R17 6011A 0698-3151 fxd film 2.87K 1% 1/8W
R18 6011A 0683-1005 fxd film 10 10% 1/4W
R19 6010A 0689-8144 fxd film 787K 1% 1/8W
R19 6011A 0811-1903 fxd ww 100 5% 10W
R19 6015A 0683-2055 fxd film 2M 5%
R20 6010A, 6015A 0811-3731 fxd ww 1.2 5% 2W
TS1 6010A, 6011A, 6015A 3103-0082 switch-thermal 200 degree/C
TS1 6012B 3103-0081 switch-thermal 202 degree/C
U1 All 1826-0346 IC OP-Amp
VR1 6010A 1902-0515 zener 6.5V 2%
VR1 6011A, 6012B, 6015A 1902-0575 zener 6.5V 2%

A5 MECHANICAL

6010A, 6015A 5020-2878 heatsink (ref. Q1)
6010A, 6012B 1205-0398 heatsink (ref. Q1)
6012B 1252-0093 socket pin (ref. Q2)
6011A 1205-0520 heatsink (ref. Q1)
6011A 06011-20001 heatsink (ref. diodes)
6011A 1205-0398 heatsink (ref. Q2)
6012B 06032-00018 outer heatsink
6012B 06032-00017 heatsink bracket
6010A, 6015A 1251-7600 connector sgl. Cont. skt.
6010A, 6015A 5020-2877 front heatsink (ref. CR5)
6010A, 6015A 5020-2878 rear heatsink (ref. CR4)

P1 All 1251-1053 connector 64-pin

6010A, 6015A 0340-1123 Insulator (ref. L1,2)
6010A, 6015A 5080-2065 Jumper (ref. L1,2)
6011A 06011-00001 bracket (ref. diode heatsink)
6011A 8150-4777 wire snubber (ref. T1, L1, L2)
6015A 2190-0100 lockwasher (CR4 to HS)

A6 All 5060-3522 AC Input Filter

C101 6010A, 6011A, 6012B 0160-4355
C101 6015A 0160-4048

fxd met .01

µF 10% 250Vac

fxd ppr-met .022

µF 250V

C102 6010A, 6011A, 6012B 0160-4281 fxd met 2200pf 20% 250Vac
C102 6015A 0160-4439
C103 6010A, 6011A, 6012B 0160-4355
C103 6015A 0160-4048

fxd ppr-met .0047
fxd met .01

µF 10% 250Vac

fxd ppr-met .022

µF 250V

µF 250V

75

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

C104 6010A, 6011A, 6012B 0160-4281 fxd met 2200pf 20% 250Vac
C105 All 0160-4962

fxd poly 1

µF 20% 250Vac

C106,107 6010A, 6011A, 6012B 0160-4183 fxd met 1000pf 20% 250Vac
C106,107 6015A 0160-4439
C108,109 All 0160-4962

fxd ppr-met .0047
fxd poly 1

µF 20% 250V

µF 250V

L101 All 66000-80004 choke, input
R101 All 0686-3945 fxd comp 390K 5% .5W
W101-103 All 1251-5613 connector, single

A6 MECHANICAL

TB110 All 0360-2217 Barrier Block 3-pos

A9 6015A OUTPUT BOARD

C1,2 6015A 0180-4231
C3 6015A 0160-2569

fxd elect 750
fxd cer 0.02

µF 350V

µF 2KV

CR1 6015A 1901-0325 diode 700V 35A
CR2,3 6015A 1901-0759 diode 600V PRV 3A
R1-4 6015A 0764-0027 fxd met 75K 5% 2W

A9 MECHANICAL

6015A 06030-0005 heatsink (ref. CR1)

CABLING

W1 All 06011-60001 ribbon cable (A2 to A3)
W7 6011A see A1 Main Board
W8 6011A see A1 Main Board

6015 5060-2864 cable assy (ref. fan)

CHASSIS

MECHANICAL

All 5021-8403 front frame casting
All 5041-8802 top trim strip
All 5001-0539 side trim strip
All 06032-00015 front sub-panel
6010A 06010-00009 lettered front panel
6011A 06011-00009 lettered front panel
6012B 06012-00018 lettered front panel
6015A 06015-00001 lettered front panel
All 0370-1091 knobs
All 5041-0309 plain key cap (ref. Front)
6012B, 6015A 5041-2089 lettered key cap
All 4040-1954 display window
All 06032-00025 Chassis
All 06032-00024 Internal cover (under top cover, lettered)
All 06032-00011 air baffle (ref. fan, attached to rear panel,

sheet metal)
All 06032-00012 DC output mounting plate
All 0380-1362 standoff (12mm)
6010A, 6011A, 6012B 06023-00026 cover plate (ref. rear panel)
All 1510-0044 binding post, single,(ref. rear panel ground)
All 0400-0086 insulated bushing (ref. rear panel AC Input

Board)
All 0380-1692 standoff (l09.4mm)
All 5001-6739 top cover
All 5001-6738 bottom cover

76

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

All 5040-1626 DC output cover (ref. Barrier Block.)
6010A, 6015A 5040-1627 AC output cover (ref. AC line cord)
6011A, 6012B 5060-3237 AC output cover with strain relief (ref. AC

line cord)
6010A, 6015A 5040-1625 strain relief (power cord)
All 5062-3703 strap handle
All 5041-8819 handle retainer (front)
All 5041-8820 handle retainer (back)
All 5041-8801 Foot
6010A, 6015A 06032-000l0 bus bar-output
6015A 2190-0587 lockwashers
6015A 3050-0894 flatwashers
6015A 0535-0077 hex nuts
6015A 0515-0155 screw mach M5x0.8 (ref. bus bar)
6015A 0515-0064 screw mach M3x0.5 (ref. fan)
6015A 0515-0156 screw mach M4x0.7 (ref. ac input cover)
6015A 0515-0210 screw mach M4x0.7 (ref. baffle, top cover,

diode board to main board, frame casting to

frame)
6015A 0515-0211 screw mach M3x0.5 (ref. rear plate, output

bus assy)
6010A, 6011A, 6015A 0515-0413 screw mach M3x0.7 (ref. main board to

chassis, ac input board, front panel)
6015A 0515-0414 screw mach M4x0.7 (ref. line choke, bus bar

cover)
6015A 0515-0610 screw mach M5x0.8 (ref. bus bar to main

board)
6015A 0515-0642 screw mach (ref. bus bar )
6015A 0515-0751 screw mach M4x0.7 (ref. pwr xmfr, relay, ac

input board )
6015A 0515-0896 screw mach M4x0.7 (ref. inside top cover )
6015A 0515-0968 screw mach (ref. output bus assy))
6015A 0515-1132 screw mach M5x0.8 (ref. strap handle))
6015A 0515-0031 nut hex w/lkwr (ref. fan front panel to

subpanel)

10,11,15 0515-0964 screw (ref. bias transformer A1T3)
10,11,15 2190-0586 lock washer (ref. bias transformer A1T3)
10,11,15 3050-0893 flat washer (ref. bias transformer A1T3)
15 06671-40002 clamp (ref. bias transformer A1T3)
15 06671-40003 bracket (ref. bias transformer A1T3)

CHASSIS

ELECTRICAL

B1 6010A, 6012B, 6015A 3160-0097 Fan
B1 6011A 3160-0381 Fan
C6 6010A 0160-2569

fxd cer 0.02

µF 20% 2KVdc

77

Table 5-3. Replaceable Parts List (continued)

Ref. Desig. Agilent Model Agilent Part Number Description

C28 6010A 0180-3703
C28 6012B 0180-3491

fxd elect 1500

fxd elect 2600

µF 250V
µF 75V

C28 6015A NOT USED
C30 6010A 0160-4962
C30 6011A 0160-0381

C31 6011A 0180-3491
C34 6010A 0160-6805

fxd poly 1.0

fxd poly .01

µF 20%
µF 10% 400V

fxd elect 10,000

fxd poly .01

µF 10% 400V

µF 40V

CB1 All 3105-0126 Circuit Breaker 4A 65Vdc
L4 All 5080-2307 choke (input line)
R20-23 6015A 0699-0208 fxd comp 1 5% 1/4W
R99,100 All 2100-4060 5K pot. (ref. Frt. Panel)
S3 All 3101-0402 switch DPST (on/off)

78

Component Location and Circuit Diagrams

This chapter contains component location diagrams, schematics, and other drawings useful for maintenance of the power
supply. Included in this section are:

Component location illustrations (Figures 6-1 through 6-6), showing the physical location and reference designators of

a.

almost all electrical parts. Components located on the A6 AC Input Board and on the output filter board mounted on
the output bus bars are easily identified by reference designators silkscreened on the boards.

b.

Notes (Table 6-1) that apply to all schematic diagrams.

c.

Schematic diagrams (Figures 6-7 through 6-9).

AC line voltage is present on the A1 Main Board Assembly whenever the power cord is connected to an ac
power source.

Table 6-1. Schematic Diagram Notes

6

1.

2.

3. Complete reference designator consists of component reference designator prefixed with assembly number
(e.g.: A2R14).

4. Resistor values are in ohms. Unless otherwise noted, resistors are either 1/4W, 5% or 1/8W, 1%. Parts list provides
power rating and tolerance for all resistors.

5. Unless otherwise noted, capacitor values are in microfarads.

6. Square p.c. pads indicate one of the following:
a. Pin 1 of an integrated circuit.
b. The cathode of a diode or emitter of a transistor.
c. The positive end of a polarized capacitor.

7. In schematic symbols drawn to show right-to-left signal flow, blocks of information are still read left to right. For
example:

denotes front-panel marking.

.

denotes rear-panel marking.

 indicates shift away from control block (normally down and to right).  indicates shift toward control block

(normally up and to left).

79

Table 6-1. Schematic Diagram Notes (continued)

8. indicates multiple paths represented by only one line. Reference designators with pin

numbers indicate destination, or signal names identify individual paths. Numbers
indicate number of paths represented by the line.

9. For single in-line resistor packages, pin 1 is marked with a dot. For dual in-line integrated circuit packages, pin 1 is
either marked with a dot, or pin 1 is to the left (as viewed from top) of indication at end of integrated circuit
package. e.g.:

Pin locations for other semi-conductors are shown below:

80

Figure 6-1. Top View, Top Covers Removed

81

82

Figure 6-2. Main Board (A1) and Filter Board (A6) Component Location

Figure 6-3. Control Board (A2) Component Location

83

84

Figure 6-4. Front Panel Board (A3) Component Location

Figure 6-5. FET Board (A4) Component Location

85

Figure 6-6. Diode Board (A5) Component Location

86

87

88

89

90

A

System Option 002 (6010A, 6011A, 6012B)

General Information

This option facilitates the operation of the power supply in an automated system. Four major circuit blocks provide:
1 ) remote analog programming of the supply's output by three different control methods; 2) signals indicating the
power supply modes and conditions; 3) two different digital methods of remote control; and 4) the outputs of three
bias supplies for use with external circuitry.

The power supply equipped with this option can be operated from either a 6940B Multiprogrammer equipped with a
69520A power supply programming card or a 6942A Multiprogrammer equipped with a 69709A power supply
programming card.

Remote Programming. Through this interface both the output voltage and current can be remote programmed by

either an external voltage source, resistance, or a current sink.

Status Indicators. Six optically isolated lines provide open-collector digital outputs which indicate the following

states: constant voltage mode, constant current mode, output unregulated, ac dropout, overvoltage, and
overtemperature.

Remote Control. Two optically isolated methods of remote control are available. 0ne method requires a negative

going edge, which sets a latch on the 002 card to inhibit the power supply. The latch and OVP are reset by a
negative-going pulse on another input line. The second method of remote control requires a low logic level to inhibit
the power supply for the duration of the low level.

Bias Supplies. The outputs of three bias supplies are also available at the option connector. These outputs are +

15V, -15V, and +5V.

Monitoring. The 002 Option Board provides two monitoring outputs (I.MON. and V.MON) available at the option

connector. They both vary from 0 to 5V corresponding to a 0 to full scale output.

Other modes of operation, such as multiple supply system control, are described in detail in later paragraphs. Modes
such as Auto series, Auto Parallel, and Auto tracking operation are described in the Operating Manual.

Specifications

Table A-1 provides specifications for the Option 002. This table is referred to periodically throughout the text of this
Appendix.

Option 002 Hardware

The Option 002 hardware consists of a single printed circuit board installed at the right side (facing the front panel)
of the chassis. Two cables connect the option board to the A2 control board at A2J1 and A2J2. Connections between
the option board and external circuits are made via the 37-pin connector mounted on the option board and available
at the rear of the power supply. A mating connector is also included for the user's convenience.

91

Remote Programming

Table A-1. Specifications, Option 002

Resistance Programming:

Accuracy: @25°C ±5°C

CV: 0.5%

CC: 1.0%

Voltage Programming: 0 to 5V provides 0 to maximum rated voltage or current output.

Accuracy: @25°C ± 5°C

CV: 0.3%
CC: 0.36%

Current Programming: 0 to 2mA current sink provides 0 to maximum rated voltage or current output.

Accuracy: @25°C ± 5°C

CV: 0.43%
CC: 0.50%

0 to 4 k ohm provides 0 to maximum rated voltage or current output.

± 235mV (6010A) 0.5% ± 35mV (6011A) 0.5% ± 70mV (6012B)

± 170mA (6010A) 1.0% ± 800mA (6011A) * 1.0% ± 500mA (6012B)

± 235mV (6010A) 0.25% ± 35mV (6011A) 0.3% ± 70mV (6012B)

± 170mA (6010A) 0.4% ± 800mA (6011A) * 0.36% ± 500mA (6012B)

± 235mV (6010A) 0.25% ± 2mV (6011A) 0.43% ± 71mV (6012B)
± 170mA (6010A) 0.30% ± 35mV (6011A) * 0.50% ± 500mA (6012B)

* After 5 minute warm-up.a

Input Compliance Voltage: ± 1V

Current Programming Enable:

Relays K2 (CV) and K1 (CC) are biased from the Control Isolator Bias input (see Remote Shutdown and OVP Clear)

Relay Bias Voltage: +4V minimum + 7V maximum

Relay Resistance: 500Ω ± 10%

Note

For Control Isolator Bias voltages greater than 7V, a series resistor must be used to maintain the relay bias voltage within
specified limits.

Enabling either relay is accomplished by bringing CV or CC enable line to Control Isolator Bias common via a suitable
driver; maximum driver off-state leakage =0.5mA.

Output Voltage and Current Monitor: 0 to 5V output indicates 0 to maximum rated output voltage or current.

Accuracy: @25°C ± 5°C

CV: 0.3% + 60mV (6010A) 0.3%

CC: 0.36% + 10mA (6010A) 0.36%

Output Impedance: 10.2 k ohm ± 5%

± 15mV (6011A, 6012B)

± 20mA (6011A, 6012B)

Temperature Coefficient:

CV: 12.5 ppm/°C +2.4mV/°C (6010A) 12.5 ppm/°C +810µV/°C (6011A, 6012B)
CC: 47 ppm/

Status Indicators:

°C + 0.54mA/°C (6010A) 47 ppm/°C + 1.6mA/°C (6011A, 6012B)

Status Isolator Bias input (referred to Status Isolator Common)

92

Table A-1. Specifications, Option 002 (continued)

Voltage Range:

+4.75V to 16V

Current Drain: 20mA maximum

Status Indicator output:
Open collector output:

Maximum Output Voltage (logic high): + 16V
Logic Low output: + 0.4V maximum at 8mA

Remote Control (Trip, Reset, Inhibit) Control Isolator Bias Input.

Voltage Range: +4.75V to 16V

Remote Control Inputs ( TripRemote , ResetRemote ) Inhibit Remote

On State (logic low):
Minimum forward current required (I

): 1.6mA Isolator forward voltage (V

f

maximum.

For Control Isolator Bias voltage greater than

± 5V, an optional resistor (Ropt) may be added to reduce drive current .

Off state ( logic high) maximum leakage current: 100µA.

REMOTE TRIP and REMOTE RESET Timing

) at 1.6 mA (If): 1.4V typical, 1.75

f

Pulse duration (TL): 15µS minimum
Reset time (TH): 125
Set-up time (Ts): 25
OVP clear delay: 1 sec

µs minimum

µs minimum

± 30% Bias Supplies DC output Ratings:

Power-on Preset
Output Ratings:

open collector output (referred to power supply common).

Maximum output voltage (logic high): + 16V
Logic low output: +0.4V maximum at 8mA

93

Table A-1. Specifications, Option 002 (continued)

Pulse Timing

Low Bias or AC DROPOUT will go false after 5V supply stabilizes.

Bias Supplies
DC Output Ratings: (25°C ± 5)

No Load to Full Load 104V to 127V line.

+ 5 V ± 3% at 100mA

± 3% at 75mA

+15 V

± 4% at75mA

-15V

Short Circuit Output Current:

+5V 125mA ± 6%
+ 15V 103mA

-15V 103mA

PARD (Typical):

± 6%
± 6%

+ 5V 25mV pk-pk 1.5mV Rms
+ 15V Same Same

-15V Same Same

Isolation:

Status Indicator lines and Remote Control lines may be floated a maximum of 240Vdc (6010A, 250Vdc, 6011A, 6012B)
from ground from the power supply or from each other. These lines may not be connected to any primary circuits.

Jumpers Designation

W1--jumpered: OV indication @ A7J3-17 is active (lo) if OVP; Remote Trip or Remote Inhibit is

active.

W1--open: OV indication is active (lo) if OVP or Remote Trip is active.

Normal operation as shipped: W3 and W4 jumpered W2 and W5 open.

OVP Programmable (6011A) A7J3-25/CV: W2 jumpered; W3 open or

AJ3-24/CC: W5 jumpered; W4 open
S1A,B in open position.

94

Installation

When installing the board, perform the following steps:

a.

Remove the top and inner cover of the power supply as discussed in Section 3 under Repair and Replacement.

b.

Remove the plate next to the barrier strip on the rear panel of the supply by unscrewing the 2 M3 screws.

c.

Insert the already prepared 002 board in the slot closest to the right side (looking from the front panel) of the

supply.

d.

Use the two M3 screws to connect the rear end of the 002 board to the rear panel of the supply.

e.

Attach ribbon cables from the A2 Control Board A2J 1 to A7J1 and A2J2 to A7J2.

f.

Replace the inner and outer cover of the supply.

g.

Remove 550V label from rear of unit.

Connector Assembly Procedure

The following instructions describe assembly of the mating connector provided to interface the user's system with
the option connector, J3. Figure A-1 identifies the parts of the mating connector.

Proceed as follows:

Note: It may be desirable to set up a test interface before final assembly of the mating connector to allow

checkout of the system. A mating connector with pins accessible for temporary wiring is available
from Agilent Technologies, Agilent part number 1251-4464. If the cable assembly presents RFI or
ESD problems, a shielded cable assembly accessory Agilent part number 5060-2890 can be ordered.

a.

If a multi-wire cable is being used as opposed to individual wires), remove approximately 1 1/2 inches of cable

insulation from the end. Be careful not to cut the insulation on the individual wires.

b. Strip 3/16 inch of insulation from the end of each wire to be used.

Insert each wire into a contact pin (1) and crimp firmly.

c.

Insert each pin into a proper hole in connector-pin house (2) from rear. Pins will lock into housing when fully

d.

inserted.

Note Once the pins are locked into the connector-pin housing, they are extremely difficult to remove.

Therefore, be certain pin is in proper hole before inserting fully.

e. Screw a slotted setscrew (3) partially into a square nut (4) and place in position in connector shield assembly

(6).

f.

Place strain relief (5) in position in connector shield assembly (6), just under set screw (3). Be certain that

strain relief is oriented as shown in Figure A-1.

Place connector pin housing (2) in shield assembly (6) and route cable through cable entrance.

g.

Fold connector assembly (6) and secure with three screws.

h.

Strain relief set screw (3) can now be adjusted from top of connector to clamp firmly on cable.

i.

Clip fasteners (7) onto ends of connector pin housing (2).

j.

Connector can now be plugged onto option connector J3 and secured with two screws (8) into the threaded

k.

stand-offs on either side of J3.

95

Figure A-1. Mating Connector Assembly

Operation

The following paragraphs provide the operating instructions necessary to interface a 002-equipped power supply
into an automated system. A brief description of some circuits is also provided. The unit is shipped for front panel
operation with mode switch settings as follows:

B1 B2 B3

011011

Before beginning, switch the power supply's rear panel MODE switches B1 through B6 to their correct positions for
the programming source being used, (see Table A-2).

Next switch A1 and A2 also on the rear panel, to the correct program source function, see Figure A-2. All
connections are made at the 37-pin rear panel connector J3, and can be wired directly into the mating connector
supplied for this purpose.

96

B4

B5 B6

Figure A-2. 002 Option Rear Panel Connector J3 and Switches A1 and A2.

Local/Remote Programming

When switching to local/ control, remember to set Front Panel Voltage and Current Control to safe
levels.

Local Programming (Figure A-3). The supply can be switched back and forth between remote and local

programming while initially checking out a remote programming circuit. For proper operation of local
programming, the user must supply the bias voltage (CONTROL ISOLATOR BIAS). The Control Isolator Bias
voltage can range from +4.75V to + 16V depending upon the user's interface circuits. Refer to Specifications
Table A-1. For local programming, take the Control Isolator Bias common and connect it to both of the LOC/REM
terminals, and position mode switch as indicated in Operation.

Although CONTROL ISOLATOR BIAS can be + 4.75V to + 16V, a supply voltage of more
than 7V may damage the relays. Therefore, if CONTROL ISOLATOR BIAS exceeds 7V it is

necessary to use a resistor in series with each of the LOC/REM terminals. Figure A-4 provides a
graph from which the proper series resistance value can be determined. Note that the tolerances
of both the Control Isolator Bias and the resistor must be taken into account. The actual Control
Bias used in Figure A-4 is obtained after subtracting any driver gate voltage drop.

97

Figure A-3. Accessing Local Programming while in Remote Programming Mode

If solid state circuitry is used, connect the Control Isolator Bias to a driver capable of sinking 10mA of current, then
connect the driver's output to both of the LOC/REM terminals. Refer to Figure A-3. Either method will enable
relays K1 (CV) and K2 (CC) to switch regulation to the front panel VOLTAGE and CURRENT controls. For
Control Isolator Bias voltages greater than 7V, a resistor (Ropt) must be used in series with the Control Isolator Bias
common or the Driver's output. Figure A-4 provides a graph for determining the proper series resistance value
depending on the Control Isolator Bias voltage being used.

The supply can be returned to the remote programming mode by switching off the Control Isolator Bias common or
by increasing the Driver's output signal to within 1V of the Control Isolator Bias voltage. If remote programming is
solely desired, leave the LOC/REM terminals open and make the proper connections to the RESISTOR/VOLTAGE
PROG. or CURRENT PROG. terminals (see Figures A-5, A-6, A-7).

Table A-2. Mode Switch settings for enabling different Programming Sources

Switch Pole Settings

Program Source

Mode

B1 B2 B3 B4 B5 B6

Resistance
Voltage or
Current

001001
010010

98

Figure A-4. Calculating Value of Series Dropping Resistor

Remote Resistance Programming

Check switches A1 and A2 on the rear panel, they must be in their correct positions for CV and CC
resistance/voltage programming (see Figure A-2). A resistance variable from 0 to 4K ohms can be used to program
the output voltage or current from 0 to full scale. To program the output voltage, connect the variable resistance
between J3-25 (CV RES/VOLT PROG.) and J3-22 (E COM.). To program the output current, connect the variable
resistance from J3-24 (CC RES/VOLT PROG.) to J3-22 (E COM.).

If the programming lines become open circuited during resistance programming (user’s system

becomes disconnected from J3), the power supply's output will tend to rise above rating. The

supply will not be damaged if this occurs, but the user's load may be damaged. To protect the
load, be sure that the overvoltage trip point is properly adjusted. The unit includes clamp circuits
to prevent it from supplying more than about 120% of rated output voltage or current when the
remote programming voltage is greater than 5Vdc or remote programming resistance is greater
than 4K ohm. Do not intentionally operate the unit above 100% rated output. Limit your
programming voltage to 5Vdc and programming resistance to 4K ohm to assure reliable
operation.

Remote Voltage Programming (Figure A-6). Check switches Al and A2 on the rear panel, they must be in the

correct positions for CV and CC resistance/ voltage programming (see Figure A-2). A voltage source variable from
0 to 5 volts, can be used to program the output voltage or current from 0 to full scale. The load on the programming
source is less than 1mA. To program voltage, the voltage source should be connected from J3-25 (CV RES & VOLT
PROG) to J3-22 (E COM). To program current, the voltage source should be connected from J3-24 (CC RES &
VOLT PROG) to J3-22 (E. COMMON). If the programming lines become open circuited (user's system becomes
disconnected from J3) during voltage programming, the Programming Protection circuit will reduce the power
supply output to zero.

99

Figure A-5. Remote Resistance Programming

100

Figure A-6. Voltage Programming of Output Voltage and Current