HP Hewlett Packard Computer Accessories 6269b User Manual

T M 1 1 - 6 6 2 5 - 2 9 5 8 - 1 4 & P

TECHNICAL MANUAL

OPERATOR’S, ORGANIZATIONAL,

DIRECT SUPPORT AND GENERAL SUPPORT

MAINTENANCE MANUAL

(INCLUDING REPAIR PARTS

AND SPECIAL TOOLS LIST)

FOR

POWER SUPPLY PP-7545/U

(HEWLETT-PACKARD MODEL 6269B)

(NSN 6130-00-148-1796)

HEADQUARTERS, DEPARTMENT OF THE ARMY

21 AUGUST 1980

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S A F E T Y

I S T H E

S T E P S

T O

O F

F O L L O W

I F

S O M E O N E

S H O C K

V I C T I M

E L E C T R I C A L

D O N O T T R Y T O P U L L O R G R A B T H E I N D I V I D U A L

I F P O S S I B L E

T U R N O F F T H E E L E C T R I C A L P O W E R

I F Y O U C A N N O T T U R N O F F T H E E L E C T R I C A L

P O W E R , P U L L , P U S H , O R L I F T T H E P E R S O N T O

S A F E T Y U S I N G

W O O D E N P O L E O R

R O P E O R

S O M E O T H E R I N S U L A T I N G M A T E R I A L

S E N D F O R H E L P A S S O O N A S P O S S I B L E

A F T E R T H E I N J U R E D P E R S O N I S F R E E O F

C O N T A C T W I T H T H E S O U R C E O F

E L E C T R I C A L

S H O C K , M O V E T H E P E R S O N

S H O R T D I S T A N C E

A W A Y A N D I M M E D I A T E L Y S T A R T A R T I F I C I A L

R E S U S C I T A T I O N

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This manual includes copyright material reproduced by permission of the HEWLETT-PACKARD Company.

TM 11-6625-2958-14&P

TECHNICAL MANUAL

HEADQUARTERS

DEPARTMENT OF THE ARMY

Washington DC, 21 August 1980

No. 11-6625-2958-14&P

OPERATOR’S, ORGANIZATIONAL, DIRECT SUPPORT AND

GENERAL SUPPORT MAINTENANCE MANUAL

(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS)

FOR

DC POWER SUPPLY PP-7545/U

(HEWLETT-PACKARD MODEL 6269B)

(NSN 6130-00-148-1796)

FOR SERIALS 1027A00101 AND ABOVE*

REPORTING OF ERRORS

You can improve this manual by recommending improvements using DA Form 2028-2 located

in the back of the manual. Simply tear out the self-addressed form, fill it out as shown on the sam-

ple, fold it where shown, and drop it in the mail.

If there are no blank DA Forms 2028-2 in the back of your manual, use the standard DA Form

2028 (Recommended Changes to Publications and Blank Forms) and forward to Commander, US

Army Communications and Electronics Materiel Readiness Command, ATTN: DRSEL-ME-MQ,

Fort Monmouth, NJ 07703.

In either case a reply will be forwarded direct to y^OU.

This manual is an authentication of the manufacturer's commercial literature which, through usage, has been found to cover the

data required to operate and maintain this equipment. Since the manual was not prepared0 in accordance with military specifications

and AR 310-3, the format has not been structured to consider Ievels of maintenance.

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TABLE OF CONTENTS

Section

Page No.

Section

Page No.

3-3

3-22

3-23

Optional Operating Modes

Remote Programming,

Constant Voltage

Remote Programming,

Constant Current

INSTRUCTIONS

0-1 Scope

6-1

. . . . . . . . . . . . . . .

0-1

0-2

Indexes

Publications

3-3

3-32

0-3 Forms and Records

0-4 Reporting Equipment Im-

0-1

3-4

3-5

3-6

3-7

3-8

3-41

3-46

3-50

3-55

3-59

Remote Sensing

provement Recom-

Auto-Parallel Operation

Auto-Series Operation

Auto-Tracking Operation

Special Operating

Considerations

Pulse Loading

Output Capacitance

m e n d a t i o n s ( E I R ) 0 - 1

0 - 1

0-5 Administrative Storage

0-6 Destruction of Army

Electronics Materiel 0-1

3-8

3-9

3-60

3-62

3-65

3-67

GENERAL INFORMATION. . . . . . . . 1-1

1-1 Description

1-7 Specifications

1-9 Options

1-11 Instrument/Manual

Identification

1-1

1-2

Reverse Voltage Loading

Reverse Current Loading

IV PRINCIPLES OF OPERATION.. . . . ...4-1

1-2

4-1

Overall BIock Diagram

Discussion

1-14 Ordering Additional Manuals 1-3

4-1

4-3

4-4

4-5

4-6

4-16

4-17

4-27

4-29

4-31

4-38

4-43

4-46

4-50

Detailed Circuit Analysis

Preregulator Control Circuit

Series Regulator and Driver

Short Circuit Protection

Constant Voltage Comparator

Constant Current Comparator

Voltage Clamp Circuit

Mixer and Error Amplifiers

Overvoltage Protection

Crowbar

II INSTALLATION . . . . . . . . 2-1

2-1

2-3

2-5

Initial Inspection

Mechanical Check

Electrical Check

2-1

2-7

Installation Data

2-9

Location

2-11

2-13

2-15

2-17

Outline Diagram

Rack Mounting

Input Power Requirements

Connections for 208 Volt

Operation (Model 6259B,

6261B, or 6268B)

4-6

4-7

4-8

4-56

4-59

4-64

4-68

Turn-On Control Circuit

Reference Regulator

Meter Circuit

2-1

2-2

2-19

2-21

Connections for 208 Volt

Operation (Model 6260B

and 6269B)

Connections for 115 Volt

Operation (Model 6259B,

6261B, and 6268B)

Connections for 115 Volt

Operation (Model 6260B)

Connections for 50Hz

Operation

Additional Protection Features

MAINTENANCE . . . . . . . . . . . . . . . . . .. 5-1

5-1

5-3

5-5

5-7

5-40

5-51

5-56

Introduction

Test Equipment Required

performance Test

5 - l

5-1

5-2

5-7

5-9

2-3

2-23

2-25

Constant Voltage Tests

Constant Current Tests

Troubles hooting

Overall Troubleshooting

Procedure

Disassembly Procedures

Repair and Replacement

Adjustment and Calibration

Meter Zero

Voltmeter Calibration

Ammeter Calibration

Constant Voltage

Programming Current

Constant Current

2-4

2-27

2-29

Power Cable

Repackaging for Shipment

5-10

5-15

5-16

5-18

5-62

5-71

5-73

5-75

5-77

5-79

5-81

III

OPERATING

INSTRUCTIONS . . . . . . . .3-1

3-1 Turn-On Checkout Procecdure 3-1

3-3 Operating Modes

3-5 Normal Operating Mode

3-7 Constant Voltage

3-9 Constant Current

3-11 Overvoltage Trip

Point Adjustment

3-14 Connecting Load

3-18 No Load Operation

3-20 Operation Beyond

Rated Output

3-1

3-2

5-19

5-90

3-2

Programming Current

Transient Recovery Time

5-20

.5-99

5-101 Ripple Imbalance 150 and

60Hz Operation)

5-20

3-3

i i i

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TABLE OF CONTENTS (Continued)

Page No.

Section

V MAINTANCE . . Continued

Section

5-111 Crowbar Disablement

Page No.

5-22

5-103 Preregulator Tracking (5 O and

60Hz Operation)

5-21

VI REPLACEABLE PARTS . . . . . . . . . . . ...6-1

5-105 50Hz Operation (Option 005) 5-21

6-1

Introduction

6-1

5-107 Crowbar Trip Voltage

5-109 Maximum Crowbar

Trip Voltage

5-21

6-4 Ordering Information

5-22

VII CIRCUIT DIAGRAMS & COMPONENT

LOCATION DIAGRAMS . . . . . . . . . . . 7-1

Page No.

APPENDIX

Section

A .

References

Components of End Item List

I n t r o d u c t i o n

A-1

I .

I I .

I I I .

c .

Integral Components of End Item

Basic Issue Items

Additional Authorization List (N/A)

Maintenance Allocation Chart

APPENDIX

Section

D-1

D-3

D-4

D-5

I .

I n t r o d u c t i o n

I I .

111.

I v .

Maintenance Allocation Chart

Tools and Test Equipment Required

Remarks

LIST OF TABLES

Page No

Table

1-1

1-3

5-1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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

5-1

5-2

5-3

5-4

5-5

5-6

5-7

5-8

6-1

6-2

6-3

6-4

6-5

5-10

5-12

Reference and Bias Voltages. .

Overall Troubleshooting

Feedback Loop Isolation . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Series Regulator Troubleshooting, High Voltage Condition . . . . . . . . . . . . . . . . ...5-13

Series Regulator Troubleshooting, Low Voltage Condition. . . . . . . . . . . . . . . . . ...5-13

5-14

Preregulator Troubleshooting

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Checks and Adjustments After Replacement of Semiconductor Devices . . . . . . . . .5-17

6-1

Reference Designators. . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Description Abbreviations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...6-1

6-2

6-5

Code List of Manufacturers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Replaceable Parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Part Number-National Stock Number Cross Reference Index . . . . . . . 6-12

MANUAL CHANGES

Check the serial number of your power supply.

Then refer to the manual changes at the rear

of this technical manual and make changes as

required so that your power supply can be

correctly serviced.

i v

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LIST OF ILLUSTRATIONS

Page No.

1-1 DC Power Supply, Model 6259B, 6260B, 6261B, 6268B, or 6269B . . . . . . . . . . . .. l-l

2-1

Figure

2-1 Outline Diagram . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2-2 Bias Transformer Primary Connections for 208Vac and 115Vac Operation . . . . . . .2-2

2-3

Power Transformer Primary Connections for 208Vac and 115Vac Operation . . . ...2-2

2-4 Power Transformer T1 Primary Connections for 208Vac Operation. . . . . . . . . . . . .. 2-3

2-5 RF I Choke (A2L1A/A2L1B) Connections for 115Vac Operation . . . . . . . . . . . . . . ...2-3

3-1

3-1 Front Panel Controls and Indicators

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-2 Normal Strapping Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-2

3-3 Remote Resistance Programming (Constant Voltage) . . . . . . . . . . . . . . . . . . . . . . ...3-3

3-4 Remote Voltage Programming, Unity Gain (Constant Voltage) . . . . . . . . . . . . . . ...3-3

3-5 Remote Voltage Programming, Non-Unity Gain (Constant Voltage). . . . . . . . . . ...3-4

3-6 Remote Resistance Programming (Constant Current) . . . . . . . . . . . . . . . . . . . . . . ...3-4

3-7 Remote Voltage Programming, Unity Gain (Constant Current) . . . . . . . . . . . . . . ...3-5

3-8 Remote Voltage Programming, Non-Unity Gain (Constant Current). . . . . . . . . . ...3-5

3-5

3-9 Remote Sensing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3-10 Auto-Parallel Operation, Two and Three Units . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-6

3-11 Auto-Series Operation, Two and Three Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...3-7

3-8

3-12 Auto-Tracking, Two and Three Units

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-1 Overall Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...4-1

4-2

4-2 Operating Locus of a CV/CC Power Supply

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4-3 Triac Phase Control Over AC Input Amplitude . . . . . . . . . . . . . . . . . . . . . . . . . . . ...4-3

4-4

5-2

5-3

5-4

4-4 Preregulator Control Circuit Waveforms . . . .

5-1 Differential Voltmeter Substitute Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-2 Constant Voltage Load Regulation Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-3 Ripple Test Setup

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5-4 Noise Spike Measurement Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...5-5

Transient Recovery Time Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...5-6

5-5

5-6 Transient Recovery Time Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...5-6

5-7 Current Sampling Resistor Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...5-8

5-8 Constant Current Load Regulation Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . ...5-8

5-9 Constant Current Ripple and Noise Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . ...5-9

5-10 “ZERO ADJUST’’ Section of Main Circuit Board . . . . . . . . . . . . . . . . . . . . . . . . . . ...5-19

7-1 A2 RFI Assembly Component Location Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . ...7-2

7-2 A3 Interconnection Circuit Board Assembly Component Location Diagram. . . . ...7-2

7-3 Top Front Chassis Assembly Component Location Diagram . . . . . . . . . . . . . . . . . . . . 7-3

7-4 Bottom Front Chassis Assembly Component Location Diagram . . . . . . . . . . . . . ...7-4

7-5 Bottom Rear Chassis Assembly Component Location Diagram . . . . . . . . . . . . . . ...7-5

7-6 Series Regulator Emitter Resistor Assembly Component Location Diagram . . . ...7-6

7-7 A4 Heat Sink Assembly Component Location Diagram (Top View) . . . . . . . . . . . ...7-6

7-8 A4 Heat Sink Assembly Component Location Diagram (End View) . . . . . . . . . . . ...7-7

7-7

7-9 Preregulator Control Circuit Waveforms

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7-10 A1 Main Printed Circuit Board Component Location Diagram. . . . . . . . . . . . . . . ...7-8

Foldout

7-11 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

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TM 11-6625-2958-14&P

SECTION O

I N T R O D U C T I O N

0-1. SCOPE.

4430.3E

and DSAR 4140.55.

c. Discrepancy in Shipment Report (DISREP)

(SF 361). Fill out and forward Discrepancy in

Shipment Report (DISREP) (SF 361) as prescribed

in AR 55-38/NAVSUPlNST 4610.33B/AFR 75-

18\MCO P4610.19C and DLAR 4500.15.

a. This manual describes DC Power

S u p p l y P P - 7 5 4 5 / U ( f i g . l - l ) a n d

provides maintenance instructions.

Throughout this manual, PP-7545/U

is referred to as the Hewlett-Pack-

ard (HP) Model 6269B DC Power

supply.

0-4. REPORTING EQUIPMENT

IMPROVEMENT

RECOMMENDATIONS (EIR).

0-2. INDEXES OF PUBLICATIONS.

EIR’s will be prepared using SF 368 (Quality Defi-

ciency Report). Instructions for preparing EIR’s

are provided in TM 38-750, the Army Mainten-

ance Management System. El R’s should be mailed

direct to Commander, US Army Communication

and Electronics Materiel Readiness Command,

ATTN: DRSEL-ME-MQ, Fort Monmouth, NJ

07703. A reply will be furnished direct to you.

a. DA Pam 310-4. Refer to the latest issue of

DA Pam 310-4 to determine whether there are new

editions, changes, additional publications per-

taining to the equipment.

b. DA Pam 310-7: Refer to DA Pam 310-7 to

determine whether there are modification work

orders (MWO’s) pertaining to the equipment.

0-3. FORMS AND RECORDS.

0-5. ADMINISTRATIVE STORAGE.

a. Reports of Maintenance and Unsatisfactory

Equipment. Maintenance forms, records, and

reports which are to be used by maintenance per-

sonnel at all maintenance levels are listed in and

Administrative storage of equipment issued to and

used by Army activities shall be in accordance with

TM 740-90-1 and paragraph 2-8.

0-6. DESTRUCTION OF ARMY

ELECTRONICS MATERIEL.

pre^SCribed by TM 38-750.

b. Report of Packaging and Handling Deficien-

ties. FiII out and forward DD Form 6 (Packaging

Improvement Report) as prescribed in AR 735-11

Destruction of Army electronics materiel to pre-

vent enemy use shall be in accordance with TM

750-244-2.

-2/NAVUPINST4440.127E/AFR

400-54/MCO

SAFETY PRECAUTIONS.

A periodic review of safety precautions in TB 385-4 is

recommended.

When the equipment is operated with covers

removed while performing maintenance, DO NOT TOUCH ex-

posed connections or compments. MAKE CERTAIN you are

not grounded when making connections or adjusting com-

ponents inside the power supply.

WARNING

HIGH VOLTAGE is used during the “performance

of maintenance as instructed in this manual.

DEATH ON CONTACT may result if personnel

fail to observe safety precautions.

0-1

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TM 11-6625-2958-14&P

SECTION I

GENERAL INFORMATION

Figure 1-1.

DC Power Supply, Model 6259B, 6260B, 6261B, 6268B, or 6269B

1-1 DESCRIPTION

1-4 The power supply has rear output terminals.

Either the positive or negative output terminal may

be grounded or the power supply can be operated

floating at up to a maximum of 300 volts above

ground.

1-2 This power supply, Figure 1-1, is completely

transistorized and suitable for either bench or relay

rack operation. It is a well-regulated, constant

voltage/constant current supply that will furnish

full rated output voltage at the maximum rated out-

put current or can be continuously adjusted through-

out the output range. The front panel CURRENT con-

trols can be used to establish the output current

limit (overload or short circuit) when the supply is

used as a constant voltage source and the VOLTAGE

controls can be used to establish the voltage limit

(ceiling) when the supply is used as a constant cur-

rent source. The supply will automatically cross

over from constant voltage to constant current oper-

ation and vice versa if the output current or voltage

exceeds these preset limits.

1-5 Output voltage and current are continuously

monitored on two front panel meters.

1-6 TerminaIs located at the rear of the unit allow

access to various control points within the unit to

expand the operating capabilities of the power sup-

ply. A brief description of these capabilities is

given below:

a. Remote Programming. The power supply

output voltage or current may be programmed (con-

trolled) from a remote location by means of an ex-

ternal voltage source or resistarice.

b. Remote-Sensing. The degradation in regu-

lation which occurs at the load due to voltage drop

in the load leads can be reduced by using the pow-

er supply in the remote sensing mode of operation.

c. Auto-Series Operation. Power supplies

1-3 The power supply contains an added feature

for protection of delicate loads. A limit can be set

on the output voltage. If this limit is exceeded the

output will automatically be shorted.

1-1

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TM 11-6625-2958-14&P

may be used in series when a higher output voltage

is required in the constant voltage mode of opera-

t ion or when greater voltage compliance is required

in the constant current mode of operation. Auto-

Series operation permits one-knob control of the

total output voltage from a “master” supply.

d. Auto-Parallel Operation. The power sup-

ply may be operated in parallel with a similar unit

when greater output current capability is required.

Auto-Parallel operation permits one-knob control of

the total output current from a “master” supply.

e. Auto-Tracking. The power supply may be

used as a “master” supply controlling one or more

“slave” supplies furnishing various voltages for a

system.

Description

Option No.

014

Three Digit Graduated Decadial Cur-

rent Control:

A single control that

replaces the coarse current control

and allows accurate resetting of the

output current.

Rewire for 115Vac Input (6260B only):

Consists of replacing the input power

transformer and circuit breaker, and

reconnecting the bias transformer, RFI

choke, and fans for 115Vac operation.

Voltage Programming Adjustment:

Two rear panel mounted, screwdriver-

adjustable controls that allow accu-

rately setting the zero volt output and

the constant voltage programming co-

efficient.

020

021

022

1-7 SPECIFICATIONS

1-8 Detailed specifications for the power supply

are given in Table 1-1 on Page 1-3.

Current Programming Adjustment:

Two rear panel mounted, screwdriver-

adjustable controls that allow accu-

rately setting the zero current output

and the constant current programming

coefficient.

1-9 OPTIONS

1-10 Options are customer-requested factory mod-

ifications of a standard instrument.

The following

options are available for the instrument covered by

this manual. Where necessary, detailed coverage

of the options is included throughout the manual.

Voltage and Current Programming

Adjustments: Options 020 and 021 on

the same instrument.

Option No.

005

Description

50Hz Regulator Realignment: Stand-

ard instruments are designed for 57 to

63 Hz operation. Option 005 (factory

realignment) is necessary when the

instrument is to be operated from a

50Hz ac source. The option consists

of changing a resistor in the preregu -

lator circuit and adjusting the prereg-

ulator tracking.

Rewire for 115Vac Input (6259B,

6261B, and 6268B only): Consists of

replacing the line circuit breaker, and

reconnecting the input power transfor-

mer, bias transformer, RF I choke, and

fans for 115Vac operation.

027

Rewire for 208Vac Input: Consists

of reconnecting the input power trans-

former and bias transformer for 208V

ac operation.

007

008

Ten-Turn Output Voltage Control:

A single control that replaces the

coarse voltage control and allows

greater resolution in setting the out-

put voltage.

1-11 lNSTRUMENT/MANUAL IDENTIFICATION

1-12 Hewlett-Packard power supplies are identified

by a two-part serial number. The first part is the

serial number prefix, a number-letter combination

that denotes the date of a significant design change

and the country of manufacture. The first two digits

indicate the year (10= 1970, 11= 1971, etc.), the

second two digits indicate the week, and the letter

“A” designates the U.S.A. as the country of manu-

facture. The second part is the power supply serial

Ten-Turn Output Current Control:

A single control that replaces the

coarse current control and allows

greater resolution in setting the out-

put current.

Ten-Turn Output Voltage and Current

Controls: Options 007 and 008 on the

same instrument.

009

010

013

number;

a different sequential number is assigned

to each power supply, starting with 00101.

Chassis Slides: Enables convenient

access to power supply interior for

maintenance purposes.

1-13 If the serial number on your instrument does

not agree with those on the title page of the manual,

Change Sheets supplied with the manual or Manual

Backdating Changes in Appendix A define the dif-

ferences between your instrument and the instru-

ment described by this manual.

Three Digit Graduated Decadial

Voltage Control: A single control that

replaces the coarse voltage control

and allows accurate resetting of the

output voltage.

1-2

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TM 11-6625-2958-14&P

your local Hewlett-Packard field office (see list at

rear of this manual for addresses). Specify the

model number, serial number prefix, and HP part

number shown on the title page.

1-14 ORDERING ADDITIONAL MANUALS

1-15 One manual is shipped with each power sup-

ply. Additional manuals may be purchased from

Table 1-1. Specifications

INPUT:

METERS:

A front panel voltmeter (0-50V) and ammeter

230Vac *10%, single phase, 57-63 Hz, 18A,

2500W @ 230V.

(0-60A) is provided.

scale. )

(Accurate within 2% of full

OUTPUT :

0-40 volts @ 0-50 amperes.

OUTPUT CONTROLS:

Single-turn coarse and fine voltage and current

controls are included on the front panel.

LOAD REGULATION:

Constant Voltage - Less than 0.01% plus 200µV

for a load current change equal to the current

rating of the supply.

OUTPUT TERMINALS:

Output bus bars are located on the rear of the

chassis. Both bus bars are isolated from the

chassis and either the positive or negative bus

bar may be connected to the chassis through a

separate, adjacent ground terminal.

Constant Current - Less than 0.02% plus 2mA

for a load voltage change equal to the voltage

rating of the supply.

LINE REGULATION :

Constant Voltage - Less than 0.01% plus 200µV

for a change in line voltage from 207 to 253 volts

at any output voltage and current within rating.

Constant Current - Less than 0.02% plus 2mA

for a change in line voltage from 207 to 253 volts

at any output voltage and current within rating.

REMOTE VOLTAGE PROGRAMMING:

All programming terminals are on a rear

barrier strip.

1V/volt (accuracy: 1%).

Constant Voltage -

Constant Current -

10mV/amp (Accuracy 10%).

REMOTE RESISTANCE PROGRAMMING:

All programming terminals are on a rear

barrier strip.

Constant Voltage -200 ohms/volt (Accuracy:

RIPPLE AND NOISE:

Constant Voltage - Less than 1mV rms, 5mV

P-P (dc to 20MHz).

Constant Current - Less than 25mA rms.

1%).

Constant Current -4 ohms/ampere (Accuracy

10%).

TEMPERATURE RATINGS:

Operating: O to 55°C. Storage: -40 to +75°C.

OVERVOLTAGE PROTECTION CROWBAR:

The minimum crowbar trip setting above the

desired operating output voltage” to prevent false

crowbar tripping is 5% of output voltage setting

plus 2 volts. Range is 4 to 45Vdc.

TEMPERATURE COEFFICIENT:

Constant Voltage - Less than O .01% plus 200µV

change in output per degree Centigrade change in

ambient following 30 minutes warm-up.

Constant Current - Less than 0.01% plus 4mA

change in output per degree Centigrade change in

ambient following 30 minutes warm-up.

COOLING:

Forced air cooling is employed. The supply has

two cooling fans.

STABILITY :

Constant Voltage - Less than O .03% plus 2mV

total drift for 8 hours following 30 minutes warm-

up under constant ambient conditions.

Constant Current- Less than 0.03% plus 10mA

total drift for 8 hours following 30 minutes warm-

up under constant ambient conditions.

WEIGHT:

95 lbs. (43.0 kg.) net. 120 lbs. (54.5 kg.)

shipping.

SIZE:

7.0“ (17.8cm) H x 17.511 (44.4cm) D x 19.0”

(48, 3 cm) W. The unit can be mounted in a

standard 19” rack panel.

TRANSIENT RECOVERY TIME:

Less than 50µsec is required for output voltage

recovery (in constant voltage operation) to within

10mV of the nominal output voltage following a

S ampere change in output current.

FINISH:

Light gray front panel with dark gray case.

1-3

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TM 11-6625-2958-14&P

SECTION II

INSTALLATION

2-1 INITIAL INSPECTION

2-2 Before shipment, this instrument was inspect-

ed and found to be free of mechanical and electri-

cal defects. As soon as the instrument is unpacked,

inspect for any damage that may have occurred in

transit. Save all packing materials until the in-

spection is completed. If damage is found, file a

claim with the carrier immediately. Hewlett-

Packard Sales and Service office should be notified.

2-3

MECHANICAL CHECK

2-4 This check should confirm that there are no

broken knobs or connectors, that the cabinet and

panel surfaces are free of dents and scratches,

and that the meters are not scratched or cracked.

2-5 ELECTRICAL CHECK

2-6 The instrument should be checked against

its electrical specifications. Section V includes

a n “in-cabinet” performance check to verify proper

instrument operation.

Outline Diagram

Figure 2-1.

2-15 INPUT POWER REQUIREMENTS

2-7 INSTALLATION DATA

2-16 Model 6259B, 6260B, 6261B, or 6268B power

supply may be operated continuously from either a

nominal 230 volt, 208 volt, or 115 volt 57-63Hz

2-8 The instrument is shipped ready for bench

operation. It is necessary only to connect the in-

strument to a source of power and it is ready for

Model 6269B may be operated from

power source.

operation.

a 230 volt or 208 volt, 57-63Hz power source only.

The instrument as shipped from the factory is wired

for 230 volt operation. The input power when oper-

ated from a 230 volt power source at full load is:

2-9

LOCATION

2-10 This instrument is fan cooled. Sufficient

space should be allotted so that a free flow of

cooling air can reach the sides of the instrument

when it is in operation. It should be used in an

area where the ambient temperature does not ex-

ceed 55°C.

Model

6259B

6260B

6261B

6268B

6269B

Input Power

850W

Input Current

12A

11A

18A

1600W

1500W

1600W

2500W

2-11 OUTLINE DIAGRAM

2-17 CONNECTIONS FOR 208 VOLT OPERATION

(Model 6259B, 6261B, or 6268B: Option 027)

2-12 Figure 2-1 illustrates the outline shape and

dimensions of Models 6259B, 6260B, 6261B, 6268B,

and 6269B.

2-18 To convert Model 6259B, 6261B, or 6268B to

operation from a 208Vac source, taps on the power

and bias transformers must be changed as follows:

a. Remove RFI assembly as described in

Steps (a) through (c) of Paragraph 5-67. Access is

now provided to bias transformer A3T2. (See Figure

7-2.)

2-13 RACK MOUNTING

2-14 This instrument is full rack size and can be

easily rack mounted in a conventional 19 inch rack

panel using standard mounting screws,

2-1

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TM 11-6625-2958-14&P

transformer (see Figure 2-2 B). Leave wire from fan

B2 (not used in 62599) soldered to “230V” terminal.

c. Re-install RFI assembly by reversing pro-

cedure of Step (a).

d. Unsolder wire connected to terminal 5 of

power transformer T1 (see Figure 7-4) and solder it

instead to terminal 4 of transformer (see Figure

2-3 B).

Power Transformer Primary

Figure 2-3.

Connections for 208Vac and 115Vac Operation

. (Model 6259B, 6261B, and 6268B)

Figure 2-2. Bias Transformer Primary Connections

for 208Vac Operation (Model 6259B, 6260B, 6261B,

6268B, and 6269B) and 115Vac Operation

(Except Model 6269B)

2-19 CONNECTIONS FOR 208 VOLT OPERATION

(Model 6260B and 6269B: Option 027)

2-20 To convert Model 6260B or 6269B to operation

from a 208Vac source, taps on the power and bias

transformers must be changed as follows:

a. Perform Steps (a) through (c) of Paragraph

2-18.

b. Unsolder wire from circuit breaker A5CB1

connected to "230V" terminal of bias transformer

A3T2 and solder it instead to "208V" terminal of

b. Unsolder wire connected to to "230V” terminal

2-2

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TM 11-6625-2958-14&P

Figure 2-4.

Power Transformer T 1 Primary

Connections for 208Vac Operation

(Model 6260B and 6269B)

of power transformer T1 (see Figure 7-4) and solder

it instead to "208V" terminal of transformer (see

Figure 2-4 B).

Figure 2-5. RFI Choke (A2L1A/A2L1B)

Connections for 115Vac Operation

(Model 6259B, 6260B, 6261B, and 6268B)

2-21 CONNECTIONS FOR 115 VOLT OPERATION

(Model -6259B, 6261B, and 6268B: Option 026)

fan B2 is not used in Model 6259B.

e. Re-install RFI assembly by reversing pro-

cedure of Step (b).

f. Unsolder jumper connecting terminals 2

and 3 of power transformer T1 (see Figure 7-4) and

solder jumpers between terminals 1 and 3, 2 and 5

(see Figure 2-3 C).

2-22 To convert Model 6259B, 6261B, or 6268B to

operation from a 115Vac source, a new circuit

breaker must be installed and taps must be changed

on the bias transformer, power transformer, and RFI

choke as follows:

a. Obtain and install new LINE circuit

breaker (A5CB1). Connections to new circuit

breaker are same as old connections. Refer to

Option 026 in Table 6-4 (Replaceable Parts) for

current rating and HP Part Number.

2-23 CONNECTIONS FOR 115 VOLT OPERATION

(Model 6260B: Option 016)

b. Remove and partially disassemble RFI

assembly as described in Steps (a) through (d) of

Paragraph 5-67.

c. Unsolder jumper between terminals 2 and

3 of RFI choke mounting board and solder jumpers

between terminals 1 and 3, 2 and 4 (see Figure

2-5 B). Replace cover on RFI assembly.

2-24 To convert Model 6260B to operation from a

115Vac source, a new power transformer and circuit

breaker must be installed and taps must be changed

on the RFI choke and bias transformer as follows:

a. Obtain and install new power transformer

(T1) and new circuit breaker (A5CB1). Refer to

Option 016 in Table 6-4 (Replaceable Parts) for

power ratings and HP Part Numbers. New transfor-

mer has two primary terminals. Transfer wire from

old transformer "0V" terminal to new transformer

"0V" terminal, and wire from old transformer "230V"

terminal to new transformer "115V" terminal. New

circuit breaker connections are same as old.

d. Unsolder wires from circuit breaker

A5CB1 and fan B2 connected to "230V" terminal of

bias transformer A3T2 (see Figure 7-2). Solder

wire from circuit breaker to "115V" terminal of

transformer, and solder wire from fan to "0V" ter-

minal of transformer (see Figure 2-2 C). Note that

2-3

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TM 11-6625-2958-14&P

b. Perform Steps (b) through (e) of Paragraph

2-22.

grounded) and be of sufficient wire size to handle

the input current drawn by the supply (see Paragraph

2-16). Note that when the supply is operated from

a 115Vac source, the input current is approximately

double that shown in Paragraph 2-16.

2-25 CONNECTIONS FOR 50Hz OPERATION

2-26 For operation from a 50Hz ac input, R82

must be replaced with a 240 W, ±5%, ½ watt resistor

as specified under Option 005 in Table 6-4 (Re-

2-29 REPACKAGING FOR SHIPMENT

2-30 To insure safe shipment of the instrument, it

is recommended that the package designed for the

instrument be used. The original packaging materi-

al is reusable. If it is not available, contact your

local Hewlett-Packard field office to obtain the

materials. This office will also furnish the address

of the nearest service center to which the instru-

ment can be shipped. Be sure to attach a tag to the

instrument specifying the owner, model number,

full serial number, and service required, or a brief

description of the trouble.

In addition, it is necessary to

placeable Parts).

readjust the voltage drop across the series regula-

tor (“Preregulator Tracking” , Paragraph 5-103) and

to check the ripple imbalance as described in Steps

(a) through (e) of Paragraph 5-101.

2-27 POWER CABLE

2-28 A power cable is not supplied with the in-

strument. It is recommended that the user-supplied

power cable have three conductors (third conductor

2-4

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TM 11-6625-2958-14&P

SECTION Ill

OPERATING INSTRUCTIONS

Figure 3-1. Front Panel Controls and Indicators,’ Modal 6259B, 6260B, 6261B, 6268B or 6269B

3-1 TURN-ON CHECKOUT PROCEDURE

3-3 OPERATING MODES

3-2 The following checkout procedure describes

the use of the front panal controls and indicators

(Figure 3-1) and ensures that the supply is opera-

tional.

a. Set LINE circuit breaker ① to ON, and

observe that pilot light ② lights.

3-4 The power supply is designed so that its mode

of operation can be selected by making strapping

connections between particular terminals on the ter-

minal strip at the rear of the power supply. The ter-

minal designations are stenciled in white on the

power supply below their respective terminals. The

following paragraphs describe the procedures for

utilizing the various operational capabilities of the

power supply. A more theoretical description con-

cerning the operational features of this supply is

contained in Application Note 90, Power Supply

Handbook (available at no charge from your local

Hewlett-Packard sales office). Sales office ad-

dresses appear at the rear of the manual.

b. Adjust VOLTAGE controls ③ until desired

voltage is indicated on voltmeter ④ .

c. To ensure that overvoltage crowbar cir-

cuit is operational, rotate OVERVOLTAGE ADJUST

control ⑤ (screwdriver adjust) counterclockwise

until unit crowbars.

Overvoltage lamp ⑥ will

light and output voltage will fall to zero volts.

d. To deactivate crowbar, return OVERVOLT-

AGE ADJUST control to its maximum clockwise po-

sition and turn off supply. Turn supply back on

and voltage should again be value obtained in step

(b).

3-5 NORMAL OPERATING MODE

3-6 The power supply is normally shipped with

its rear terminal strapping connections arranged for

constant voltage/constant current, local sensing,

local programming, single unit mode of operation.

This strapping pattern is illustrated In Figure 3-2.

The operator selects either a constant voltage or a

constant current output using the front panel con-

trols (local programming; no strapping changes are

necessary).

e. To check out constant current circuit,

turn off supply. Short circuit rear output terminals

and turn on supply.

f. Adjust CURRENT controls ⑦ until desired

output current is indicated on ammeter ⑧ .

g. Remove short circuit and read following

paragraphs before connecting actual load to supply.

3-1

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TM 11-6625-2958-14&P

Clockwise rotation of the control produces higher

trip voltages. The factory sets the control fully

clockwise. The crowbar may be disabled complete-

ly if desired. (Refer to Paragraph 5-11 1.)

3-13 False crowbar tripping must be considered

when adjusting the trip point. If the trip voltage is

set too close to the operating output voltage of the

supply, a transient in the output will falsely trip

the crowbar. It is recommended that the crowbar be

set higher than the output voltage by 5% of the out-

put voltage plus 2 volts. However, If occasional

crowbar tripping on unloading can be tolerated, the

crowbar trip point can be set much closer to the

operating out put voltage of the supply.

Figure 3-2. Normal Strapping Pattern

3-7 CONSTANT VOLTAGE

3-14 CONNECTING LOAD

3-8 To select a constant voltage output, proceed

as follows:

a. Turn on power supply and adjust VOLTAGE

controls for desired output voltage with output ter-

minals open.

b. Short circuit output terminals and adjust

CURRENT controls for maximum output current al-

lowable (current limit), as determined by load con-

ditions. If a load change causes the current limit

to be exceeded, the power supply will automatical-

ly cross over to constant current output at the pre-

set current limit and the output voltage will drop

proportionately. In setting the current Iimit, al-

lowance must be made for high peak currents which

3-15 Each load should be connected to the power

supply output terminals using separate pairs of

connecting wires. This will minimize mutual cou-

pling effects between loads and will retain full ad-

vantage of the low output impedance of the power

supply. Each pair of connecting wires should be as

short as possible and twisted or shielded to reduce

noise pickup. (If a shielded pair is used, connect

one end of the shield to ground at the power supply

and leave the other end unconnected.)

3-16 If load considerations require that the output

power distribution terminals be remotely located

from the power supply, then the power suppIy out-

put terminals should be connected to the remote

distribution terminals via a pair of twisted or

shielded wires and each load should be separately

connected to the remote distribution terminals. For

this case, remote sensing should be used. (Refer

to Paragraph 3-4 1.)

can cause unwanted crossover. (Refer to Paragraph

3-60. )

3-9 CONSTANT CURRENT

3-10 To select a constant current output, proceed

as follows:

a. Short circuit output terminals and adjust

CURRENT controls for desired output current.

b. Open output terminals and adjust VOLT-

AGE controls for maximum output voltage allowable

(voltage limit ), as determined by load conditions.

If a load change causes the voltage limit to be ex-

ceeded, the power supply will automatically cross

over to constant voltage output at the preset volt-

age limit and the output current will drop propor-

tionately. In setting the voltage limit, allowance

must be made for high peak voltages which can

cause unwanted crossover. (Refer to Paragraph 3-60.)

3-17 Positive or negative voltages can be obtained

from this supply by grounding either one of. the out-

put terminals or one end of the load. Always use

two leads to connect the load to the supply, regard-

less of where the setup is grounded. This will elim-

inate any possibility of output current return paths

through the power source ground which would dam-

age the line cord plug. This supply can also be

operated up to 300Vdc above ground, if neither out-

put terminal is grounded.

3-18 NO LOAD OPERATION

3-11 OVERVOLTAGE TRIP POINT ADJUSTMENT

3-19 When the supply is operated without a load,

down-programming speed is considerably slower

than in normal loaded operation. This slower pro-

gramming speed is evident when using any method

of down-programming - either turning the VOLTAGE

controls fully counterclockwise, activating the

crowbar, or throwing the LINE circuit breaker to

OFF. Under any of these conditions, the supply

output will rapidly fall to approximately two volts,

3-12 The crowbar trip voltage can be adjusted by

using the screwdriver control on the front panel.

The trip voltage range is as follows:

6 2 6 1 B

6268B, 6269B

6259B, 6260B

2 to 12Vdc

2 to 23Vdc

4 to 45Vdc

When the crowbar trips, the output is shorted and

the amber indicator on the front panel lights.

3-2

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TM 11-6625-2958-14&P

3-26 The output voltage of the supply should be

then proceed at a slower rate towards zero. The

actual time required for the output to fall from two

volts to zero will vary from several seconds to

several minutes, depending upon which down-pro-

gramming method is used.

-15mV ±5mV when zero ohms is connected across

the programming terminals. If a zero ohm voltage

closer to zero than this is required, it may be

achieved by inserting and adjusting R110 as dis-

cussed in Paragraph 5-83, or, if the instrument is

equipped with Option 020, by adjusting potentiome-

ter R113 as discussed in Paragraph 5-85.

3-20 OPERATION BEYOND RATED OUTPUT

3-21 The shaded area on the front panel meter face

indicates the approximate amount of output voltage

or current that may be available in excess of the

normal rated output. Although the supply can be

operated in this shaded region without being dam-

aged, it cannot be guaranteed to meet all of its

performance specifications.

3-27 To maintain the stability and temperature co-

efficient of the power supply, use programming re-

sistors that have stable, low noise, and low temp-

erature coefficient (less than 30ppm per degree

Centigrade) characteristics. A switch can be used

in conjunction with various resistance values in

order to obtain discrete output voltages. The switch

should have make-before-break contacts to avoid

momentarily opening the programming terminals dur-

ing the switching interval.

3-22 OPTIONAL OPERATING MODES

3-23 REMOTE PROGRAMMING, CONSTANT

VOLTAGE

3-24 The constant voltage output of the power

supply can be programmed (controlled) from a re-

mote location if required. Either a resistance or

voltage source can be used as the programming

device. The wires connecting the programming

terminals of the supply to the remote programming

device should be twisted or shielded to reduce

noise pickup. The VOLTAGE controls on the front

panel are automatically disabled in the following

procedures.

3-25 Resistance Programming

(Figure 3-3). In this

mode, the output voltage will vary at a rate deter-

mined by the voltage programming coefficient of

200 ohms/volt. The programming coefficient is de-

termined by the programming current. This current

is factory adjusted to within 1% of 5mA. If greater

programming accuracy is required, it may be

achieved by either adjusting R3 as discussed in

Paragraph 5-88, or, if the instrument is equipped

with Option 020, by adjusting potentiometer R112

as discussed in Paragraph 5-89.

Remet e Voltage Programming,

Unity Gain (Constant Voltage)

Figure 3-4.

3-28 Voltage Programming,

Unity Gain (Figure 3-4).

Employ the strapping pattern shown in Figure 3-4

for voltage programming with unity gain. In this

mode, the output voltage will vary in a 1 to 1 ratio

with the programming voltage (reference voltage)

and the load on the programming voltage source will

not exceed 20 microampere. Impedance matching

resistor (R_x) is required to maintain the temperature

coefficient and stability specifications of the sup-

ply .

3-29 Voltage Programming, Non-Unity Gain (Figure

3-5). The strapping pattern shown in Figure 3-5

can be utilized for programming the power supply

using an external voltage source with a variable

voltage gain. The output voltage in this configura-

tion is found by multiplying the external voltage

source by (Rp/RR).

Figure 3-3. Remet e Resistance Programming

(Constant Voltage)

3-30 External resistors Rp and R^Rshould have sta-

ble, low noise, and low temperature coefficient

3-3

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TM 11-6625-2958-14&P

Figure 3-6. Remote Resistance Programming

(Constant Current)

Figure 3-5. Remote Voltage Programming,

Non-Unity Gain (Constant Voltage)

with Option 021, by adjusting potentiometer R116

as discussed in Paragraph 5-98. The output current

of the supply when zero ohms is placed across the

programming terminals may be set to exactly zero

by either inserting and adjusting R117 as discussed

in Paragraph 5-92, or, if the instrument is equipped

with Option 021, by adjusting potentiometer R119

as discussed in Paragraph 5-94.

(less than 30ppm Per degree Centigrade) character-

istics in order to maintain the Supply's temperature

and stability specifications. Reference resistor R^R

should not exceed 10K. Note that it is possible to

use the front panel voltage control already in the

supply (A5R121) as the voltage gain control (Rp) by

simply removing the external Rp and strapping ter-

minals Al and A2 together.

3-35 Use stable, low noise, low temperature co-

efficient (less than 30ppm/°C) programming resis-

tors to maintain the power supply temperature coef-

ficient and stability s pacifications. A switch may

be used to set discrete values of output current. A

make-before-break type of switch should be used

since the output current will exceed the maximum

rating of the power supply if the switch contacts

open during the switching interval.

3-31 The output voltage of the supply may be ad-

justed to exactly zero when the external program-

ming voltage is zero by either inserting and adjust-

ing R111 as discussed in Paragraph 5-84, or, if the

instrument is equipped with Option 020, by adjust-

ing potentiometer R112 as discussed in Paragraph

5-86.

3-32 REMOTE PROGRAMMING, CONSTANT

CURRENT

3-33 Either a resistance or a voltage source can

be used to control the constant current output of

the supply. The CURRENT controls on the front

panel are automatically disabled in the following

procedures.

If the programming terminals (A4 and

A 6) should open at any time during the

remote resistance programming mode,

the output current will rise to a value

that may damage the power supply

and/or the load. If, in the particular

programming configuration in use,

there is a chance that the terminals

might become open, it is suggested

that a 200 ohm resistor be connected

across the programming terminals.

Like the programming resistor, this

resistor should be a low noise, low

temperature coefficient type. Not e

that when this resistor is used, the

resistance value actually programming

the supply is the parallel combination

of the remote programming resistance

and the resistor across the program-

ming terminals.

3-34 Resistance Programming (Figure 3-6). In this

mode, the output current varies at a rate determined

by the programming coefficient as follows:

Model

6259B

6260B

6261B

6268B

6269B

Programming Coefficient

4 ohms/ampere

2 ohms/ampere

4 ohms/ampere

6 ohms/ampere

4 ohms/ampere

The programming coefficient is determined by the

constant current programming current which is ad-

justed to within 10% of 2.5mA at the factory. If

greater programming accuracy is required, it may

be achieved by either adjusting R30 as discussed

in Paragraph 5-97, or, if the instrument is equipped

3-4

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TM 11-6625-2958-14&P

programmed using an external voltage source with

variable gain by utilizing the strapping pattern

shown in Figure 3-8. In this mode, the output cur-

rent is found by multiplying the external voltage

source (Es) by [Rp/(RR x Kp)], where Kp is the

constant current voltage programming coefficient as

given in Paragraph 3-37. The value of reference

resistor R^Rand programming voltage source E_s

should be such that the value of ES/RR is equal to

or greater than 2.5mA.

3-39 External resistors Rp and R^Rshould have sta-

ble, low noise, and low temperature coefficient

(less than 30ppm per degree Centigrade) character-

istics in order to maintain the stability and temper-

ature specifications of the Power supply. Reference

resistor R^Rshould not exceed 10K. Note that it is

possible to use the front panel current control al-

ready in the supply (A5R123) as the gain control (Rp)

by simply removing the external Rp and strapping

terminals AS and A6 together.

Remote Voltage Programming,

Unity Gain (Constant Current]

Figure 3-7.

3-36 Voltage Programming

, Unity Gain (Figure 3-7).

In this mode, the output current will vary linearly

with changes in the programming voltage. The pro-

gramming voltage should not exceed 0.6 volts.

Voltage in excess of 0.6 volts will result in exces-

sive power dissipation in the instrument and possi-

ble damage.

3-40 The output current of the supply may be ad-

justed to exactly zero when the external program-

ming voltage is zero by either inserting and adjust-

ing R115 as discussed in Paragraph 5-93, or, if the

instrument is equipped with Option 021, by adjust-

ing potentiometer R116 as discussed in Paragraph

5-95.

3-37 The output current varies at a rate determined

by the programming coefficient as follows:

Model

6259B

6260B

6261B

6268B

6269B

Programming Coefficient

10.0mV/ampere

5.0mV/ampere

3-41 REMOTE SENSING (Figure 3-9)

10.0mV/ampere

16.7mV/ampere

10.0mV/ampere

3-42 Remote sensing is used to maintain good reg-

ulation at the load and reduce the degradation of

regulation which would occur due to the voltage

drop in the leads between the power supply and the

load. Remote sensing is accomplished by utilizing

the strapping pattern shown in Figure 3-9. The

Power supply should be turned off before changing

strapping paterns. The leads from the sensing (±S)

terminals to the load will carry much less current

than the load leads and it is not required that these

leads be as heavy as the load leads. However,

they must be twisted or shielded to minimize noise

pickup.

The current required from the voltage source will be

less than 20µA. Impedance matching resistor R_xis

required to maintain the temperature coefficient and

stability specifications of the supply.

Non-Unity Gain (Figure

3-38 Voltage Programming,

3-8). The power supply output current can be

Remote Voltage Programming,

Figure 3-8.

Non-Unity Gain (Constant Current)

Figure 3-9.

Remote Sensing

3-5

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from the -S terminal to the negative side of the load.

Note that there may be more than one lead connect-

ed to the +S and -S terminals.

3-43 For reasonable load lead lengths, remote

sensing greatly improves the performance of the

supply. However, if the load is located a consid-

erable distance from the supply, added precautions

must be observed to obtain satisfactory operation.

Notice that the voltage drop in the load leads sub-

tracts directly from the available output voltage

and also reduces the amplitude of the feedback er-

ror signals that are deveIoped within the unit. Be-

cause of these factors it is recommended that the

drop in each load lead not exceed 0.5 volt. If a

larger drop must be tolerated, please consult an

HP Sales Engineer.

3-46 AUTO-PARALLEL OPERATION (Figure 3-10)

3-47 Two or more power supplies can be connected

in an Auto-Parallel arrangement to obtain an output

NOTE

Due to the voltage drop in the load

leads, it may be necessary to read-

just the current limit in the remote

sensing mode.

3-44 Observance of the precautions in Paragraph

3-43 will result in a low dc output impedance at

the load. However, another factor that must be

considered is the inductance of long load leads.

This causes a high ac Impedance and could affect

the stability of the feedback loop seriously enough

to cause oscillation. If this is the case, it is

recommended that the following actions be taken:

a. Adjust equalization control R47 to remove

oscillation, or to achieve best possible transient

response for given long load lead configuration.

Refer to Paragraph 5-27 for discussion of transient

response measurement.

b. If performing adjustment in step (a) above

does not remove oscillation, disconnect output

capacitor A3C3 and connect a capacitor having sim-

ilar characteristics (approximately the same capa-

citance, the same voltage rating or greater, and

having good high frequency characteristics) direct-

ly across load using short leads. Readjust equali-

zation control R47 as in step (a) above after making

this change. In order to gain access to capacitor

A3C3, it is necessary to remove the RFI assembly

as described in steps (a) through (c) of Paragraph

5-67. Lead from positive side of capacitor (shown

arrowed In Figure 7-2) can then be unsoldered from

A3 interconnection circuit board.

3-45 To employ remote sensing with any method of

remote programming or with any method of combin-

ing more than one supply discussed in the Preced-

ing or following paragraphs, use the following pro-

cedure:

a. Remove the two external leads connecting

the sensing terminals (±S) to the output bus bars

(±OUT).

b. Connect a lead from the +S terminal to the

positive side of the load, and connect another lead

Figure 3-10. Auto-Parallel Operation,

Two and Three Units

3-6

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current greater than that available from one supply.

Auto-Parallel operation permits equal current shar-

ing under all load conditions, and allows complete

control of the output current from one master power

supply. The output current of each slave will be

approximately equal to the master’s output current

regardless of the load conditions. Because the

output current controls of each slave are operative,

they should be set to maximum to prevent the slave

reverting to constant current operation; this would

OCCur if the master output current setting exceeded

the slave’s.

3-48 Additional slave supplies may be added in

parallel with the master/slave combination as

shown in the bottom half of Figure 3-10. All the

connections between the master and slave #1 are

duplicated between slave #1 and the added slave

supply. In addition, the strapping pattern of the

added slave should be the same as slave #1. Re-

mote sensing and programming can be used, though

the strapping arrangements shown in Figure 3-10

show local sensing and programming.

3-49 Overvoltage protection is controlled by the

crowbar circuit in the master supply which monitors

the voltage acress the load and fires the SCR's in

both units if an overvoltage condition occurs. The

firing pulses are fed to the slave supply from trans-

former T90 (winding 5-6) of the master supply

through the “ EXT. CROWBAR TRIGGER^"terminals on

the rear panel of the master supply. Correct polari-

ty must be observed in connecting the crowbars to-

gether. The overvoltage trip point is adjusted on

the master supply, The OVERVOLTAGE ADJUST po-

tentiometer on the slave supply should be set to

maximum [clockwise) so that the master crowbar

will control the slave.

3-50 AUTO-SERIES OPERATION (Figure 3-11)

3-51 Two or more power supplies can be operated

in Auto-Series to obtain a higher voltage than that

available from a single supply. When this connec-

tion is used, the output voltage of each slave sup-

ply varies in accordance with that of the master

supply. At maximum output voltage, the voltage of

the slaves is determined by the setting of the front

panel VOLTAGE controls on the master. The master

supply must be the most positive supply of the

series. The output CURRENT controls of all series

units are operative and the current limit is equal to

the lowest control setting. If any of the output

CURRENT controls are set too low, automatic cross-

over to constant current operation will occur and

the output voltage will drop. Remote sensing and

programming can be used, though the strapping ar-

rangements shown in Figure 3-11 show local sensing

and programming.

Auto-Series Operation,

Two and Three Units

Figure 3-11.

cient and stability specifications of the power sup-

ply, the external resistors (Rx) shown in Figure

3-11 should be stable, low noise, low temperature

coefficient (less than 30ppm per degree Centigrade)

3-52 In order to maintain the temperature coeffi-

The value of each resistor is dependent

resistors.

3-7

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on the maximum voltage rating of the "master" sup-

ply. The value of R_Xis this voltage divided by the

voltage programming current of the slave supply

(1/Kp where K^Pis the voltage programming coeffi-

cient). The voltage contribution of the slave is

determined by its voltage control setting.

3-53 Overvoltage protection is provided in Auto-

Series operation by connecting the crowbars in par-

allel with correct polarity as in Auto-Parallel oper-

ation (see Paragraph 3-49). The OVERVOLTAGE AD-

JUST potentiometer in each supply should be adjust-

ed so that it trips at a point slightly above the out-

put voltage that the supply will contribute.

3-54 When the center tap of an Auto-Series combi-

nation is grounded, coordinated positive and nega-

tive voltages result. This technique is commonly

referred to as “robber-banding” and an external

reference source may be employed if desired. Any

change of the internal or external reference source

(e.9. drift, ripple) will cause an equal percentage

change in the outputs of both the master and slave

supplies. This feature can be of considerable use

in analog computer and other applications, where

the load requires a positive and a negative power

supply and is less susceptible to an output voltage

change occurring simultaneously in both supplies

than to a change in either supply alone.

3-55 AUTO-TRACKING OPERATION (Figure 3-12)

3-56 The Auto-Tracking configuration is used when

several different voltages referred to a common bus

must vary in proportion to the setting of a particular

instrument (the control or master). A fraction of the

master’s output voltage is fed to the comparison

amplifier of the slave supply, thus controlling the

slave's output. The master must have the largest

output voltage of any power supply in the group. It

must be the most positive supply in the example

shown on Figure 3-12.

3-57 The output voltage of the slave (Es) is a per-

centage of the master's output voltage (EM), and is

determined by the voltage divider consisting of R_X

and the voltage control of the slave supply, Rp,

where E^S= EM [Rp/(R_x+Rp)]. Remote sensing and

programming can be used (each supply senses at its

own load), though the strapping patterns given in

Figure 3-12 show only local sensing and program-

ming. In order to maintain the temperature coeffi-

cient and stability specifications of the power sup-

ply, the external resistors should be stable, low

noise, low temperature coefficient (less than 30ppm

per degree Centigrade) resistors.

Figure 3-12. Auto-Tracking, Tw^Oand Three Units

each slave will also decrease. However, the re-

verse is not true. If one of the slave units crow-

bars, the other supplies in *the ensemble will not

be affected.

3-58 The overvoltage protection circuit in each

unit is operable end independently monitors the

voltage across its own load. Notice that if the

master supply crowbars, the output voltage of

3-59 SPECIAL OPERATING CONSIDERATIONS

3-60 “PULSE LOADING

will automatically cross

3-61 The power supply

3-8

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c. A large surge current causing a high pow-

er dissipation in the load occurs when the load re-

sistance is reduced rapidly.

over from constant voltage to constant current op-

eration, or the reverse, in response to an increase

(over the preset limit) in the output current or volt-

age, respectively. Although the preset limit may

be set higher than the average output current or

voltage, high peak currents or voltages (as occur

in pulse loading) may exceed the preset limit and

cause crossover to occur. If this crossover limit-

ing is not desired, set the preset limit for the peak

requirement and not the average.

3-65 REVERSE VOLTAGE LOADING

3-66 A diode (A4CR106) is connected across the

output terminals. Under normal operation condi-

tions, the diode is reverse biased (anode connect-

ed to the negative terminal). If a reverse voltage

is applied to the output terminals (^POSitive voltage

applied to the negative terminal), the diode will

conduct, shunting current across the output termi-

nals and limiting the voltage across the output

terminals to the forward voltage drop of the diode.

This diode protects the series transistors and the

output electrolytic capacitors.

3-62 OUTPUT CAPACITANCE

3-63 An internal capacitor (A3C3) connected across

the output terminals of the power supply, helps to

supply high-current pulses of short duration during

constant voltage operation. Any capacitance added

externally will improve the ^PUlSe current capability,

but will decrease the safety provided by the con-

stant current circuit. A high-current pulse may

damage load components before the average output

current is large enough to cause the constant cur-

rent circuit to operate.

3-67 REVERSE CURRENT LOADING

3-68 Active loads connected to the power supply

may actually deliver a reverse current to the power

supply during a portion of its operating cycle. An

external source cannot be allowed to pump current

into the supply without loss of regulation and pos-

sible damage to the output capacitor. To avoid

these effects, it is necessary to preload the supply

with a dummy load resistor so that the power supply

delivers current through the entire operation cycle

of the load device.

3-64 The effects of the output capacitor during

constant current operation are as follows:

a. The output impedance of the power supply

decreases with increasing frequency.

b. The recovery time of the output voltage is

longer for load resistance changes.

3-9

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4-6 The feedback signals controlling the conduc-

tion of the series regulator originate within the

constant voltage or constant current comparator.

During constant voltage operation the constant

voltage comparator continuously compares the out-

put voltage of the supply with the drop across the

VOLTAGE controls.

If these voltages are not equal,

the comparator produces an amplified error signal

which is further amplified by the error amplifier and

then fed back to the series regulator in the correct

phase and amplitude to counteract the difference.

In this manner, the constant voltage comparator

helps to maintain a constant output voltage and

also generates the error signals necessary to set

the output voltage at the level established by the

VOLTA GE controls.

4-7 During constant current operation, the con-

stant current comparator detects any difference be-

tween the voltage drop developed by the load cur-

rent flowing through the current sampling resistor

and the voltage acress the CURRENT controls. If

the two inputs to the comparator are momentarily

unequal, an error signal is generated which (after

amplification) alters the conduction of the series

regulator by the amount necessary to reduce the

error voltage at the comparator input to zero.

Hence, the IR drop across the current sampling re-

sistor, and therefore the output current, is main-

tained at a constant value.

Figure 4-2. Operating Locus of a CV/CC

Power Supply

value. With a short circuit across the output load

terminals, I^OUT= ES and EOUT = O.

4-10 The ‘^:Crossover” value of load resistance can

be defined as R^C= Es/Is. Adjustment of the front

panel voltage and current controls permits this

“crossover” resistance R^Cto be set to any desired

value from 0 to ¥ . If RL is greater than RC, the

supply is in constant voltage operation, while if R^L

is less than RC, the supply is in constant current

operation.

4-8 Since the constant voltage comparator tends

to achieve zero output impedance and alters the

output current whenever the load resistance

changes, while the constant current comparator

causes the output impedance to be infinite and

changes the output voltage in response to any load

resistance change, it is obvious that the two com-

parison amplifiers cannot operate simultaneously.

For any-given value of load resistance, the power

supply must act either as a constant voltage source

or as a constant current source - it cannot be both.

4-11 The short circuit protection circuit (see Fig-

ure 4-1) protects the series regulator in the event

of a shorted output when the controls are set to a

high output voltage and current. The protection cir-

cuit monitors the voltage drop across the series

regulator. If the drop rises above a preset level,

the protection circuit limits the current through the

series regulator until the preregulator can reduce

the voltage across the series regulator. Once this

voltage returns to normal, the short circuit protec-

tion circuit is turned off and has no effect on norm-

al operation of the supply.

4-9 Figure 4-2 shows the output characteristic of

a constant voltage/constant current power supply.

With no load attached (RL = ¥ ), IOUT = O, and

E^OUT= Es, the front panel voltage control setting.

When a load resistance is applied to the output

terminals of the power supply, the output current

increases, while the output voltage remains con-

stant; point D thus represents a typical constant

voltage operating point. Further decreases in load

resistance are accompanied by further increases in

I^OUTwith no change in the output voltage until the

output current reaches Is, a value equal to the front

panel current control setting. At this point the sup-

ply automatically changes its mode of operation and

becomes a constant current source; still further

decreases in the value of load resistance are ac-

companied by a drop in the supply output voltage

with no accompanying change in the output current

4-12 The overvoltage protect ion crowbar monitors

the output of the supply, and if it exceeds a preset

(adjustable) threshold, fires an SCR which short

The circuit also sends a turn-

circuits the supply.

down signal to the preregulator control circuit.

4-13 The overvoltage limit circuit protects the main

rectifier diodes and filter capacitors from damage

that might occur if the series regulator transistors

were shorted or the voltage programming pot were

opened. The circuit monitors the output voltage of

4-2

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T M 1 1 - 6 6 2 5 - 2 9 5 8 - 1 4 & P

the supply and, if it exceeds approximately 120%

of maximum rated output, sends a turn-down signal

to the preregulator control circuit. Hence, the out-

put voltage of the supply is limited to a “safe” val-

ue despite any possible failure in the series regu-

lator feedback loop.

4-14 The turn-on control circuit is a long time

constant network which allows the supply to

achieve a gradual turn-on characteristic. The slow

turn-on feature protects the preregulator triac and

the series regulator from damage which might occur

when ac power is first applied to the unit. At turn-

on, the control circuit sends inhibiting voltages to

the preregulator control circuit and the s cries regu-

lator (via the error and driver amplifiers). A short

time after the unit is in operation, the inhibiting

voltages are removed and the circuit no longer ex-

ercises any control over the operation of the supply.

4-15 The reference supply provides stable refer-

ence voltages used by the constant voltage and

current comparators. Less critical operating volt-

ages are obtained from the bias supply.

Figure 4-3. Triac Phase Control Over

4-16 DETAILED CIRCUIT ANALYSIS (See

Figure 7-11)

AC Input Amplitude

4-17 PREREGULATOR CONTROL CIRCUIT

box (assembly A2) to minimize radiated and reflect-

ed RFI. Further RFI suppression is provided by by-

pass capacitors C110 and C111.

4-18 The preregulator minimizes changes in the

power dissipated by the series regulating transis -

tors due to output voltage or. input line voltage var-

iations. Preregulation is accomplished by means

of a phase control circuit utilizing triac A2CR1 as

the switching element.

4-21 The preregulator control circuit samples the

input line voltage, the output voltage, and the

voltage across the series regulator transistors. It

generates firing pulses, at the time required, to

fire the triac. This action maintains the ac input

voltage across the primary winding of T I at the de-

sired level.

4-19 In order to understand the operation of the

preregulator, it is important to understand the op-

eration of the triac. The triac is a hi-directional

device, that is, it can conduct current in either

direction. Hence, the device fires whenever it

receives a gating pulse regardless of the polarity

of the input a c that is applied to it. The triac is

fired once during each half-cycle (8.3 3 millisec-

onds) of the input ac (see Figure 4-3). Notice that

when the triac is fired at an early point during the

half-cycle, the ac level applied to the power trans-

former is relatively high. When the triac is fired

later during the half-cycle, the ac level is rela-

tively low.

4-22 The inputs to the control circuit are algebra-

ically summed across capacitor C70. All inputs

contribute to the time required to charge C70. The

input line voltage is rectified by CR81, CR82, CR83,

and CR84, attenuated by voltage divider R86 and

R83, and applied to the summing point at the col -

lector of Q71 (TP81) via capacitor C70. Capacitor

C73 is used for smoothing purposes.

4-23 Transistor Q71, connected in a common base

configuration, provides a charging current for the

summing capacitor varying in accordance with the

input signals applied to its emitter. Resistor R78,

connected between the negative output line and the

emitter of Q71, furnishes a signal which is propor-

tional to the output voltage. Resistors R75 and R76

sample the voltage across, and the current through,

the series regulator. Capacitor C72 and resistor

R82 stabilize the entire preregulator feedback loop.

Resistors R70 and R80 are the source of a constant

offset current which sustains a net negative charg-

4-20 Normally the ac input signal must be at a

certain minimum potential before the triac will con-

duct. However, A2R1 and A2C1 provide a holding

current that allows the triac to conduct at any time

during the ac input cycle. RFI choke A2L1A/A2L1B

(in series with the triac) slows down the turn-on of

the triac in order to minimize spikes at the output

of the supply. Components A2CR1, A2R1, A2L1A/

A2L1B, and A2C1 are all mounted inside a shielded

4-3

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waveform (C) of Figure 4-4, the firing pulse is

quite narrow because Q73 saturates rapidly, causing

the magnetic field surrounding T70 to collapse. Di-

ode CR76 damps out positive overshoot.

ing current to the summing point, ensuring that the

triac will fire at low output “voltages.

4-24 The summation of the input signals results

in the generation of a voltage waveform at TP80

similar to that shown in waveform (A) of Figure 4-4.

When the linear ramp portion of the waveform

reaches a certain negative threshold voltage, di-

odes CR74 and CR75 become forward biased. The

negative voltage is then coupled to the base of

transistor Q72. Transistors Q72 and Q73 form a

squaring circuit resembling a Schmitt trigger con-

figuration. Q72 is conducting prior to firing time

due to the positive bias connected to its base

through R84, Transistor Q73 is cut off at this time

because its base is driven negative by the collect-

or of Q72.

4-26 Reset of the control circuit occurs once every

8.33 milliseconds when the rectified ac voltage at

the junction of CR77, CR78, and CR79 (TP82) in-

creases to a level at which diode CR78 becomes

forward biased. Summing capacitor C70 is then al-

lowed to discharge through CR78. Diodes CR74 and

CR75 become reverse biased at reset and transistor

Q72 reverts to its “on” state. Consequently, Q73

is turned off and capacitor C71 charges up through

R79 at a comparatively slow rate until the collector

voltage of Q73 reaches approximately +11 volts.

The above action causes the small positive spike

that appears across the windings of pulse transform-

er at T70 at reset time.

4-25 When the negative threshold voltage is

reached, transistor Q72 is turned off and Q73 is

turned on. The conduction of Q73 allows capacitor

C71 to discharge rapidly through pulse transformer

T70 resulting in the generation of a firing pulse

across the secondary winding of T70. As shown in

4-27 SERIES REGULATOR AND DRIVER

4-28 The series regulator consists of transistors

A4Q103 through A4Q108 connected in parallel. The

transistors serve as the series or “pass” element

which provides precise and rapid control of the out-

put. Resistors A4R150 through A4R155 allow high

output currents to be equally shared by the series

regulator transistors. The conduction of the series

transistors is controlled by signals obtained from

driver A4Q102, which is connected in a Darlington

configuration with the parallel-connected series

regulator transistors. Thermal switch A4TS101 opens

if the heat sink assembly temperature exceeds ap-

proximately 230°F, thus turning off the series regu-

lator transistors. This feature protects critical

components of the supply from excessive tempera-

tures which could occur if cooling fan A4B1 failed.

Diode CR50 provides a discharge path for the out-

put capacitors when the supply is rapidly down-

programmed; R57 limits the discharge current flow-

ing through the diode and through error amplifier

A4Q101. Diode A4CR105, connected across the reg-

ulator circuit, protects the series elements from

reverse voltages that could develop across them

during parallel operation if one supply is turned on

before the other.

4-29 SHORT CIRCUIT PROTECTION

4-30 This circuit acts to initially protect the series

regulator against a simultaneous full-voltage, full-

current conditions such as might occur if the output

were shorted when the controls were set to deliver

a high output voltage and current. Under this con-

dition, Q20 goes into heavy conduction due to the

increased voltage across the series regulator,

putting R26 in parallel with the current controls and

thus limiting the current to less than 10% of the

Within 10 milliseconds after the

supply’s rating.

short circuit is imposed, the preregulator shuts off.

Figure 4-4. Preregulator Control Circuit Waveforms

4-4

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TM 11-6625-2958-14&P

during rapid down-programming; diodes CR5 and

The input capacitor then begins to discharge through

the series regulator, and the voltage across the

regulator decreases until Q20 turns off. The dis-

charge time (typically ½ to 4 seconds) depends on

the voltage and current ratings of the supply, the

main filter capacitor, and the control settings.

Once this recovery time has elapsed, the output

current will return to the level set by the current

controls, and the preregulator will return the volt-

age across the series regulator to the normal 3.5V

level, thus limiting the power dissipated by the

s cries regulator.

CR6 prevent excessive voltage excursions from

over-driving the differential amplifier. Capacitor

C2 prevents the gain of the feedback loop from

changing during manipulation of the VOLTAGE con-

trols. Resistor R2 limits the discharge current

through C2. Resistors Z2F, Z2M, and Z2N bias the

differential amplifier; diode CR4 provides tempera-

ture compensation.

4-36 During constant voltage operation, the pro-

gramming current flowing through the programming

resistors (VOLTAGE controls) is held constant be-

cause the value of shunt resistor R3 is factory

selected to allow all of the +6.2 volt reference to

be dropped across R3, R4, and RS. Linear constant

voltage programming is thus assured with a constant

current flowing through A5R121 and A5R122. If the

supply is equipped with Option 020, resistor R111

and potentiometer R 112 allow the programming cur-

rent to be adjusted by varying the bias applied to

the summing point.

4-31 CONSTANT VOLTAGE COMPARATOR

4-32 This circuit consists of the programming re-

sistors (A5R121 and A5R122) and a differential am-

plifier stage (Z1 and associated components). An

integrated circuit is used for the differential ampli-

fier to minimize differential voltages due to mis-

matched transistors and thermal differentials.

4-33 The constant voltage comparator continuously

compares the voltage drop across the VOLTAGE con-

trols with the output voltage and, if a difference

exists, produces an error voltage whose amplitude

is proportional to this difference. The error signal

ultimately alters the conduction of the series regu-

lator which, in turn, alters the output current so

that the output voltage becomes equal to the voltage

drop across the VOLTAGE controls. Hence, through

feedback action, the difference between the two in-

puts to Z1 is held at zero volts.

4-37 Main output capacitor A3C3 stabilizes the

series regulator feedback loop and helps supply

high-current pulses of short duration during con-

stant voltage pulse loading operation. An additional

output capacitor (C 19), connected directly across

the output bus bars, helps maintain a low ac output

impedance by compensating for the inductive react-

ance of the main output capacitor at high frequencies.

C19 also prevents any spikes in the output from

reaching the load.

4-34 One input of the differential amplifier (pin

10) is connected to the output voltage sensing ter-

minal of the supply (+S) through impedance equaliz-

ing resistor R23. Resistors R1 and optional resistor

R110 are used to zero bias the input. If the supply

is equipped with Option 020, resistor R114 and po-

tentiometer R 113 provide a variable input bias that

allows the output voltage to be adjusted to exactly

zero volts when the supply is programmed for zero

output. The other input of the differential amplifier

(pin 1) is connected to a summing point (terminal

A2) at the junction of the programming resistors and

the current pullout resistors R3, R4, end R5. In-

stantaneous changes in the output voltage or

changes in the voltage at the summing point due to

manipulation of the VOLTAGE controls produce a dif-

ference voltage between the two inputs of the dif-

ferential amplifier. This difference voltage is am-

plified and appears at the output of the differential

amplifier (pin 12) as an error voltage which ulti-

mately varies the conduction of the series regulator.

4-38 CONSTANT CURRENT COMPARATOR

4-39 This circuit is similar in appearance and op-

eration to the constant voltage comparator circuit.

It consists of the coarse and fine current controls

(A5R123 and A5R124) and a differential amplifier

stage (Z 1 and associated components). As in the

constant voltage comparator, an integrated circuit

is used for the differential amplifier to minimize

differential voltages due to mismatched transistors

and thermal differentials.

4-40 The constant current comparator circuit con-

tinuously compares the voltage drop across the

CURRENT controls with the voltage drop across the

current sampling resistor, A4R123. If a difference

exists, the differential amplifier produces an error

signal which is proportional to this difference.

The remaining components in the feedback loop

(mixer amplifier, error amplifiers, and the series

regulator) function to maintain the voltage drop

across the current sampling resistors, and hence

the output current, at a constant value.

4-3 S Resistor R6, in series with the summing-point

input to the differential amplifier, limits the cur-

rent through the programming resistors during rapid

voltage turn-down. Diode CR7 prevents excessive

current drain from the +6.2 volt reference supply

4-41 One input of the differential amplifier (pin 7)

is connected to the output bus through impedance

equalizing resistor R20 and is zero-biased by R21

4-5

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and optional resistor R 117. The other input of the

differential amplifier (pin 4) is connected to a sum-

ming point (terminal A6) at the junction of the pro-

4-46 MIXER AND ERROR AMPLIFIERS

4-47 The mixer and error amplifiers amplify the

error signal from the constant voltage or constant

current input circuit to a level sufficient to drive

the series regulating transistors. Mixer amplifier

Q41 receives the error voltage input from either the

constant voltage or constant current comparator via

the OR-gate diode (CR1 or CR20) that is conducting

at the time. Diode CR1 is forward biased and CR20

reverse biased during constant voltage operation.

The reverse is true during constant current opera-

tion.

gramming resistors and the current pullout resistors

R30 and R31. Changes in the output current due to

load changes or changes in the voltage at the sum-

ming point due to manipulation of the CURRENT

controls produce a difference voltage between the

two inputs of the differential amplifier. This differ-

ence voltage is amplified and appears at the output

of the differential amplifier (pin 6) as an error volt-

age which ultimately varies the conduction of the

s cries regulator.

4-48 Transistor Q40 provides a constant current to

the collector of Q41 and also generates a negative

going turn-off signal for the series regulator when

the unit is first turned off. Feedback network C41,

R47, and R53 shapes the high frequency rolloff in

the loop gain response in order to stabilize the

series regulator feedback loop.

4-42 Resistor R30 serves as a trimming adjustment

for the programming current flowing through A5R123

and A5R124. If the supply is equipped with Option

021, resistor R115 and potentiometer R116 provide

a means of adjusting the programming current. As

in the constant voltage comparator circuit, a vari-

able input bias (from resistor R118 and potentiome-

ter R119) is provided to allow the output current to

be adjusted to exactly zero when the supply is pro-

grammed for zero output. Diode CR21 limits exces-

sive voltage excursions at the summing-point input

to the differential amplifier.

4-49 Error amplifiers Q42 and A4Q101 serve as the

predriver elements for the series regulator. In addi-

tion, transistor A4Q101 allows faster down-program-

ming by providing a discharge path for output ca-

pacitors A3C3 and C19, and by supplying a bleed

current for the series regulator (thus keeping it in

its linear, active region) when the supply is set for

zero output current. Diode CR44, in the base cir-

4-43 VOLTAGE CLAMP CIRCUIT

cuit of transistor A4Q101, prevents the base from

going more negative than -3 volts. This action li-

mits the current through R57 to a relatively low

level, thus protecting A4Q101 from damage in the

event a voltage higher than the programmed output

voltage is placed across the output terminals (such

as might occur in Auto-Parallel or battery charging

applications).

4-44 The voltage clamp circuit keeps the constant

voltage programming current relatively constant

when the power supply is operating in the constant

current mode. This is accomplished by clamping

terminal A2, the voltage summing point, to a fixed

bias voltage. During constant current operation the

constant voltage programming resistors are a shunt

load acress the out put terminals of the power sup-

ply. When the output voltage changes, the current

through these resistors also tends to change. Since

this programming current flows through the current

sampling resistor, it is erroneously interpreted as

a load change by the current comparator circuit.

The clamp circuit eliminates this undesirable effect

by maintaining this programming current at a con-

stant level.

4-50 OVERVOLTAGE PROTECTION CROWBAR

4-51 The overvoltage protection circuit protects

delicate loads from high voltage conditions such

as might result from the failure of the series regu-

lator transistor. It accomplishes this by shorting

the output of the supply. Under normal operation

(no overvoltage), Q92 is conducting since CR91 is

reverse biased and Q91 is off. Thus no trigger

signal is received by SCR A4CR110 and it acts as

an open circuit, having no effect on normal output

voltage.

4-45 The voltage divider, Z2A, Z2B, and VR1, back

biases CR2 and Q1 during constant voltage opera-

t ion. When the power supply goes into constant

current operation, CR2 becomes forward biased by

the voltage at pin 12 of Z 1. This results in conduc-

tion of Q1 and the clamping of the summing point at

a potential only slightly more negative than the

normal constant voltage potential. Clamping this

voltage at approximately the same potential that

exists in constant voltage operation results in a

constant voltage acress, and consequently a con-

stant current through, the current pullout resistors

R3, R4, and R5.

4-52 A5R125 (OVERVOLTAGE ADJUST) adjusts the

bias of Q92 with relation to -S. It establishes the

point at which CR91 becomes forward biased and

Q92 is turned off. Zener diode VR90 provides a

stable reference voltage with which the -S potential

is compared; R95 sets the upper crowbar trip limit.

When Q92 turns off, Q91 begins to conduct, send-

ing a positive going trigger pulse to A4CR110,

causing it to create a near short circuit across the

4-6

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plied to the series regulator. This negative voltage

keeps the regulator cut off untill C35 charges up.

Diode CR37 provides a discharge path for C35 when

the supply is turned off.

output. When A4CR110 is fired, overvoltage lamp

A5DS2 is tuned on, completing a path for a + 11V

unregulated holding current through A5DS2. This

current holds A4CR110 on even after the output

voltage has fallen. A4 CR110 will remain in conduc-

tion until the supply is turned off. R92 supplies the

holding current if lamp A5DS2 should open. R106

protects A4CR108 and A4CR110 from the large surge

current that occurs when A4CR110 is first fired.

CR93 damps out positive overshoot in the trigger

pulse.

4-59 REFERENCE REGULATOR

4-60 The reference circuit is a feedback power

supply similar to the main supply. It provides

stable reference voltages used throughout the unit.

AH the reference voltages are derived from dc ob-

tained from full wave rectifier CR61-CR62 and filter

capacitor C61. The total output of the reference

circuit is 18.6V. Zener diodes VR60 and VR61 es-

tablish moderately well regulated potentials of

+6.2V and -6.2V respectively from the common point

+S, while the regulator circuit establishes a very

well regulated potential of +12.4 volts from +S.

Resistor R63 limits the current through the Zener

diodes to establish an optimum bias level.

4-53 The firing of SCR A4CR110 biases Q90 into

conduction, placing approximately +11 volts on the

cathode of CR74 in the preregulator control circuit

and thus reverse biasing CR74 and CR75. This

action, by preventing transistor Q 72 from turning

off, prevents the generation of any trigger pulses

and turns off the preregulator. This prevents the

series regulator from experiencing a full-voltage,

full-current condition.

4-61 The regulating circuit consists of s cries reg-

ulating transistor Q60, driver Q61, and differential

amplifier Q62 and Q63. The voltage across Zener

diode VR60 (+6.2 volts with respect to +S) and the

voltage at the junction of divider Z2L-R69B and Z2J

are compared, and any difference is amplified by

Q 62 and Q63. The error voltage thus appearing at

the collector of Q62 is amplified by driver stage

Q61 and applied to series regulator Q60 in the cor-

rect phase and amplitude to maintain the +12.4 volt

output at a constant level.

4-54 The crowbar circuit creates an extra current

path during normal operation of the supply, thus

changing the current that flows through the sam-

pling resistor. Diode CR92 keeps this extra current

at a fixed level for which compensation can then be

made in the constant current comparator circuit.

4-55 A slaving arrangement of crowbar circuits in

more than one unit is made possible by an extra

secondary winding (terminals 5 and 6) on transfor-

mer T90. Terminals on the rear barrier strip (±EXT.

CROWBAR TRIGGER) allow easy connection to this

winding. Connecting these windings in parallel

when operating in a multiple-supply configuration

will result in all the crowbars being activated if

one of the crowbars is tripped. To reset the crow-

bars in this arrangement, all of the units must be

turned off and then on. Correct polarity must be

observed when connecting the windings in parallel.

Figures 3-10 and 3-11 (Auto-Parallel and Auto-

Series ) demonstrate these connections.

4-62 Diode CR60, connected from voltage divider

R66 and R67 to the base of Q61, serves as a turn-

on circuit for series regulator transistor Q60. When

the supply is first turned on, CR60 biases driver

Q61 on, thus turning on the series regulator. When

the reference supply reaches normal output, the

base voltage of Q61 is sufficient to reverse bias

CR60, thus effectively removing it from the circuit.

Capacitor C60, connected across the output of the

reference supply, removes spikes and stabilizes

the reference reguIator loop.

4-56 TURN-ON CONTROL CIRCUIT

4-63 Unregulated 11Vdc is supplied from a sepa-

rate winding on transformer A3T2 by diodes CR53

and CR54 and filter capacitor C44. Additional light-

ly regulated reference voltages of -4V and -2.4V are

provided by diodes CR45-CR46 and CR47-CR48-CR49

respectively. Diode CR43 prevents reverse current

flow from damaging the main supply series reguIator

transistors. Diode CR7, shown in the schematic

near the current pullout resistors (R3, R4, and RS),

protects the Zener diodes in the reference circuit

by providing a path for surge currents which occur

during rapid down programming.

4-57 This circuit is a long time-constant network

which protects the triac and the series regulator

from possible damage during turn-on. When the

supply is first tuned on, C35 provides a positive

voltage to the anodes of CR35 and CR36. The volt-

age from CR35 is connected to the cathode of diode

CR74 in the preregulator control circuit to ensure

that it is initially reverse biased. After C35 be-

comes sufficiently charged, diode CR35 becomes

reverse biased and the preregulator control circuit

is permitted to fire the triac.

4-58 Diode CR36 performs a similar function for

the series regulator. CR36 initially couples a pos-

itive voltage to Q41 where it is inverted and ap-

4-64 METER CIRCUIT

4-65 The meter circuit provides continuous indica-

4-7

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4-68 ADDITIONAL PROTECTION FEATURES

tions of output voltage and current on the dc volt-

meter and ammeter. Both meter movements can

withstand an overload of many times the maximum

rated output without damage.

4-69 The supply contains several “special pur-

pose” components which protect the supply in the

event of unusual circumstances. One of these

components is diode A4CR106. Connected across

the output terminals of the supply, it prevents in-

ternal damage from reverse voltages that might be

applied across the supply. This could occur, fo_r

example, during Auto-Series operation if one sup-

ply was turned on before the other.

4-66 The ammeter together with its series resistors

(R101, R105) is connected across current sampling

resistor A4R123. As mentioned previously, the

voltage drop across the current sampling resistor

varies in proportion to the output current.

ometer R101 is adjusted for full scale deflection

Potenti-

4-70 Resistors R108 and R109 limit the output of

the supply if the connections between both output

buses and the sensing terminals (+S and -S) are in-

advertently removed.

(calibration) of the ammeter.

4-67 The voltmeter, in series with R103 and R104

and shunted by R102 and R106, is connected direct-

ly across the output terminals of the supply. Poten-

tiometer R106 permits calibration of the voltmeter.

4-71 Diode A4CR105, previously mentioned in the

series regulator description, protects the regula-

ting transistor from the effects of reverse voltages.

4-8

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SECTION V

MAINTENANCE

returning the power supply to normal operation, re-

peat the performance check to ensure that the fault

has been properly corrected and that no other faults

exist. Before performing any maintenance checks,

turn on the power supply and allow a half-hour

warm-up.

5-1 INTRODUCTION

5-2 Upon receipt of the power supply, the per-

formance check (Paragraph 5-5) should be made.

This check is suitable for incoming inspection. If

a fault is detected in the power supply while mak-

ing the performance check or during normal opera-

tion, proceed to the troubleshooting procedures

(Paragraph 5-51). After troubleshooting and repair

(Paragraph 5-71), perform any necessary adjust-

ments and calibrations (Pare graph 5-73). Before

5-3 TEST EQUIPMENT REQUIRED

5-4 Table 5-1 lists the test equipment required to

perform the various procedures described in this

section.

Table 5-1. Test Equipment Required

RECOMMENDED

MODEL

REQUIRED

CHARACTERISTICS

USE

TYPE

3420A/B (See

Note on Page 5-2)

Differential

Voltmeter

Measure dc voltages;

calibration procedures.

Sensitivity: 1mV full scale (min.)

Input impedance: 10M W (rein.)

140A with 1423A

time base and

1400A vertical

plug-in; 1402A

plug-in for spike

measurement.

Measure ripple; display

transient recovery wave-

form; measure noise

spikes.

Oscilloscope

Sensitivity and bandwidth;

100µV/cm and 400KHz for all

measurements except noise spike;

5mV sensitivity and 20 MHz band-

width for noise spike measure-

ment.

- - - -

Vary ac input for line

regulation measurement.

Variable

Voltage

Transformer

Range: 207-253Vac. Recommend-

ed minimum output current: 12A,

6259B; 22A, 6261B and 6268B;

24A, 6260B: 36A, 6269B.

403B

412A

AC Voltmeter

DC Voltmeter

Measure ac voltages and

ripple.

Sensitivity: 1mV full scale de-

flection (min). Accuracy: 2%.

Sensitivity: 1mV full scale de-

flection (rein). Accuracy: 1%.

Measure dc voltages.

Repetitive

Load Stitch

Switching rate: 60-400Hz

Rise time: 2µsec.

Measure transient re-

covery time.

See Figure 5-5.

- - - -

Resistive

Loads

Values: see Figures 5-2 and 5-5.

Power supply load

resistors.

A4R123;_:A4R123A-

A4R123B,

6260B only; see

Replaceable Parts

Table.

Current

Sampling

Resistors

Values: see Figure 5-8.

Measure output current;

calibrate ammeter.

5-1

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Table 5-1.

REQUIRED

Test Equipment Required (Continued)

RECOMMENDED

MODEL

TYPE

USE

CHARACTERISTICS

- - - -

Terminating

Resistors

Value: 50 ohms, ½ watt, ±5%,

non-inductive. (Four required.)

Noise spike measure-

ment.

- - - -

Blocking

Capacitors

Value: 0.01µF, 100Vdc. (Two

required.)

Noise spike measure-

ment.

NOTE

5-5 PERFORMANCE TEST

A satisfactory substitute for a differen-

tial voltmeter is a reference voltage

source and null detector arranged as

shown in Figure 5-1. The reference

voltage source is adjusted so that the

voltage difference between the supply

being measured and the reference volt-

age will have the required resolution

for the measurement being made. The

voltage difference will be a function of

the null detector that is used. Exam-

ples of satisfactory null detectors are:

419A null detector, a dc coupled

5-6 The following test can be used as an incoming

inspection check and appropriate portions of the

test can be repeated either to check the operation

of the instrument after repairs or for periodic main-

The tests are performed using a 230V

tenance tests.

ac, 60 Hz, single phase input power source. If the

correct result is not obtained for a particular check,

do not adjust any internal controls; proceed to

troubleshooting (Paragraph 5-5 1).

5-7 CONSTANT VOLTAGE TESTS

5-8 If maximum accuracy is to be obtained in the

following measurements, the measuring devices

must be connected as close to the output terminals

as possible. This is particularly important when

measuring the transient response, regulation, or

ripple of the power supply. A measurement made

across the load includes the impedance of the leads

to the load and such lead lengths can easily have

an impedance several orders of magnitude greater

than the supply impedance, thus invalidating the

measurement.

oscilloscope utilizing differential in-

put, or a 50mV meter movement with a

100 division scale. For the latter, a

2mV change in voltage will result in a

meter deflection of four divisions.

5-9 To avoid mutual coupling effects, each moni-

toring device must be’ connected to the output ter-

minals by a separate pair of leads. Twisted pairs

or shielded two-wire cables should be used to avoid

pickup on the measuring leads. The load resistor

should be connected across the output terminals as

close to the supply as possible. When measuring

the constant voltage performance specifications, the

current controls should be set well above (at least

10%) the maximum output current which the supply

will draw, since the onset of constant current

action will cause a drop in output voltage, increased

ripple, and other performance changes not properly

ascribed to the constant voltage operation of the

supply .

Figure 5-1. Differential Voltmeter Substitute

Test Setup

5-10 Voltage Output and Voltmeter Accuracy. To

check the output voltage, proceed as follows:

a. Connect load resistor (R^L) indicated in

Figure 5-2 across output terminals of supply.

b. Connect differential voltmeter acress

Care must be exercised to avoid ground

loops and circulating currents when

using an electronic null detector in

which one input terminal is grounded.

+OUT and -OUT terminals of supply, observing

5-2

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5-13 Line Regulation.

Definition: The change D EOUT in the

static value of dc output voltage re-

sulting from a change in ac input volt-

age over the specified range from low

line (usually 207 volts) to high line

(usually 253 volts), or from high

line to low line.

5-14 To check the line regulation, proceed as

follows :

a. Connect test setup shown in Figure 5-2.

b. Connect variable auto transformer between

input power source and power supply power input.

c. Adjust variable auto transformer for 207

volts a c input.

d. Turn CURRENT controls fully clockwise.

e. Turn on supply and adjust VOLTAGE con-

trols until front panel meter indicates exactly maxi-

mum rated output voltage.

f. Read and record voltage indicated on dif-

ferential voltmeter.

Figure 5-2. Constant Voltage Load Regulation

Test Setup

g. Adjust variable auto transformer for 253V

ac input.

h. Reading on differential voltmeter should

not vary from reading recorded in Step (f) by more

than the following:

correct polarity.

c. Turn CURRENT controls fully clockwise.

d. Turn on supply and adjust VOLTAGE con-

trols until front panel meter indicates exactly max-

imum rated output voltage.

e. Differential voltmeter should indicate the

following:

1.2mV

2.2mV

4.2mV

6259B,6260B

6261B

6268B, 6269B

10 ±0.2Vdc

20 ±0.4Vdc

40 ±0.8Vdc

6259B, 6260B

6261B

6268B, 6269B

5-15 Ripple and Noise.

Definition: The residual ac voltage

superimposed on the dc output of a

regulated power supply. Ripple and

noise may be specified and measured

in terms of its RIMS or (preferably)

5-11

Load Regulation.

Definition: The change D EOUT in the

static value of dc output voltage re-

sulting from a change in load resist-

ance from open circuit to a value

which yields maximum rated output

peak-to-peak value.

Ripple and noise measurement can be made at any

input ac line voltage combined with any dc output

voltage and load current within the supply's rating.

current (or vice versa).

5-16 The amount of ripple and noise that is pres-

ent in the power supply output is measured either

in terms of the RMS or (preferably) peak-to-peak

value. The peak-to-peak measurement is particu-

larly important for applications where noise spikes

could be detrimental to a sensitive load, such as

logic circuitry. The RMS measurement is not an

ideal representation of the noise, since fairly high

output noise spikes of short duration can be pres-

ent in the ripple without appreciably increasing the

RMS value,

5-12 To check the constant voltage load regula-

tion, proceed as follows:

‘a. Connect test setup shown in Figure 5-2.

b. Turn CURRENT controls fully clockwise.

c. Turn on supply and adjust VOLTAGE con-

trols until front panel meter indicates exactly max-

imum rated output current.

d. Read and record voltage indicated on dif-

ferential voltmeter.

e. Disconnect load resistor.

f. Reading on differential voltmeter should

not vary from reading recorded in Step (d) by more

than the following:

5-17 Ripple Measurements. Figure 5-3A shows an

incorrect method of measuring p-p ripple. Note

that a continuous ground loop exists from the third

wire of the input power cord of the supply to the

third wire of the input power cord of the oscillo-

scope via the grounded power supply case, the

6259B, 6260B

1.2mV

2.2mV

4.2mV

6261B

6268B, 6269B

5-3

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wire between the negative output terminal of the

power supply and the vertical input of the scope,

and the grounded scope case. Any ground current

circulating in this loop as a result of the difference

in potential EG between the two ground points

causes an IR drop which is in series with the scope

input. This IR drop, normally having a 60Hz line

frequency fundamental, plus any pickup on the un-

shielded leads interconnecting the power supply

and scope, appears on the face of the CRT. The

magnitude of this resulting noise signal can easily

be much greater than the true ripple developed be-

tween the plus and minus output terminals of the

power supply, and can completely invalidate the

measurement.

5-18 The same ground current and pickup problems

can exist if an RMS voltmeter is substituted in

place of the oscilloscope in Figure 5-3. However,

the oscilloscope display, unlike the true RMS

meter reading, tells the observer immediately

whether the fundamental period of the signal dis-

played is 8.3 milliseconds (1/120 Hz) or 16.7 milli-

seconds (1/60 Hz). Since the fundamental ripple

supply is

frequency present on the output of an

120Hz (due to full-wave rectification), an oscillo-

scope display showing a 120Hz fundamental com-

ponent is indicative of a “clean” measurement set-

up, while the presence of a 60Hz fundamental

usually means that an improved setup will result in

a more accurate (and lower) value of measured rip-

ple.

5-19 Although the method shown in Figure 5-3A is

not recommended for ripple measurements, it may

prove satisfactory in some instances provided cer-

tain precautionary measures are taken. One meth-

od of minimizing the effects of ground current (IG)

flow is to ensure that both the supply and the test

instrument are plugged into the same ac power

buss.

Ripple Test Setup

Figure 5-3.

5-20 To minimize pick up, a twisted pair or (pref-

erably) a shielded two-wire cable should be used

to connect the output terminals of the power supply

to the vertical input terminals of the scope. When

using a twisted pair, care must be taken that one

of the two wires is connected both to the grounded

terminal of the power supply and the grounded input

terminal of the oscilloscope. When using shielded

two-wire cable, it is essential for the shield to be

connected to ground at one end only to prevent any

ground current flowing through this shield from in-

ducing a signal in the shielded leads.

actual ripple measurement.

5-22 If the foregoing measures are used, the

single-ended scope of Figure 5-3A may be adequate

to eliminate non-real components of ripple so that

a satisfactory measurement can be obtained. How-

ever, in stubborn cases or in measurement situa-

tions where it is essential that both the power sup-

ply case and the oscilloscope case be connected

to ground (e. g. if both are rack-mounted), it may

be necessary to use a differential scope with

floating input as shown in Figure 5-3B. If desired,

two single-conductor shielded cables may be sub-

stituted in place of the shielded two-wire cable

with equal success.

5-21 To verify that the oscilloscope is not dis-

playing ripple that is induced in the leads or pick-

ed up from the grounds, the (+) scope lead should

be shorted to the (-) scope lead at the power sup-

ply terminals.

leads are shorted should be subtracted from the

The ripple value obtained when the

5-4

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Because of its common mode rejection, a differen-

tial oscilloscope displays only the difference in

signal between its two vertical input terminals,

thus ignoring the effects of any common mode sig-

nal produced by the difference in the ac potential

between the power supply case and scope case.

Before using a differential input scope in this man-

ner, however, it is imperative that the common

mode rejection capability of the scope be verified

by shorting together its two input leads at the pow-

er supply and observing the trace on the CRT. If

this trace is a straight line, then the scope is pro-

perly ignoring any common mode signal present. If

this trace is not a straight line, then the scope is

not rejecting the ground signal and must be realign-

ed in accordance with the manufacturer’s instruc-

tions until proper common mode rejection is attain-

ed.

5-23 To check the ripple output, proceed as fol-

lows :

a. Connect oscilloscope or RMS voltmeter

as shown in Figures 5-3A or 5-3B.

b. Turn CURRENT controls fully clockwise.

c. Adjust VOLTAGE controls until front panel

meter indicates maximum rated output voltage.

d. The observed ripple should be less than

the following:

Figure 5-4. Noise Spike Measurement Test Setup

coax shield, resulting in an erroneous measurement.

5. Since the impedance matching resistors

constitute a 2-to-1 attenuator, the noise spikes

observed on the oscilloscope should be less than

2.5mV p-p instead of 5mV p-p.

6259B, 6260B, 6261B

6268B, 6269B

500µVrms and 5mV p-p

1mVrms and 5mV p-p

5-24 Noise Spike Measurement. When a high fre-

quency spike measurement is being made, an in-

strument of sufficient bandwidth must be used; an

oscilloscope with a bandwidth of 20 MHz or more is

adequate. Measuring noise with an instrument that

has insufficient bandwidth may conceal high fre-

quency spikes detrimental to the load.

5-26 The circuit of Figure 5-4 can also be used for

the normal measurement of low frequency ripple:

simply remove the four terminating resistors and

the blocking capacitors and substitute a higher gain

vertical plug-in in place of the wide-band plug-in

required for spike measurements. Notice that with

these changes, Figure 5-4 becomes a two-cable

version of Figure 5-3B.

5-25 The test setup illustrated in Figure 5-3A

is generally not acceptable for measuring spikes;

a differential oscilloscope is necessary. Further-

more, the measurement concept of Figure 5-3B

must be modified if accurate spike measurement

is to be achieved

1. As shown in Figure 5-4, tw^Ocoax cables

must be substituted for the shielded two-wire cable.

2. Impedance matching resistors must be in-

cluded to eliminate standing waves and cable ring-

ing, and capacitors must be inserted to block the

dc current path.

3. The length of the test leads outside the

coax is critical and must be kept as short as pos-

sible; the blocking capacitor and the impedance

matching resistor should be connected directly from

the inner conductor of the cable to the power supply

terminals.

4. Notice that the shields of the power sup-

ply end of the two coax cables are not connected to

the power supply ground, since such a connection

would give rise to a ground current path through the

5-27 Transient Recovery Time.

Definition: The time "X" for the output

voltage recovery to within "Y" millivolts

of the nominal output voltage following a

"Z" amp step change in load current,

where: "Y" is specified as 10mV, the

nominal output Voltage is defined as the

dc level ‘halfway between the static out-

put voltage before and after the imposed

load change, and "Z" is the specified

load current change of S amps or the full

load current rating of the supply, which-

ever is less.

5-28 Transient recovery time may be measured at

any input line voltage combined with any output

voltage and load current within rating,

5-29 Reasonable care must be taken in switching

the load resistance on and off. A ha rid-operated

s-s

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TM 11-6625-2958-14&P

switch in series with the load is not adequate,

since the resulting one-shot displays are difficult

to observe on most oscilloscopes, and the arc

energy occurring during switching action completely

masks the display with a noise burst. Transistor

load switching devices are expensive if reasonably

rapid load current changes are to be achieved.

5-32 To check the transient recovery time, pro-

ceed as follows:

a. Connect test setup shown in Figure 5-5.

b. Turn CURRENT controls fully clockwise.

c. Turn on supply and adjust VOLTAGE con-

trols until front panel ammeter indicates 5 amps

output current.

d. Close line switch on repetitive load

switch setup.

5-30 A mercury-wetted relay, as connected in the

load switching circuit of Figure 5-5 should be used

for loading and unloading the supply. When this

load switch is connected to a 60Hz ac input, the

mercury-wetted relay will open and close 60 times

per second. Adjustment of the 25K control permits

adjustment of the duty cycle of the load current

switching and reduction in jitter of the oscilloscope

display.

e. Set oscilloscope for internal sync and

lock on either positive or negative load transient

spike.

f. Set vertical input of oscilloscope for ac

coupling so that small dc level changes in power

supply output voltage will not cause display to

shift.

g. Adjust the vertical centering on the scope

so that the tail ends of the no load and full load

waveforms are symmetrically displayed about the

horizontal center line of the oscilloscope. This

center line now represents the nominal output volt-

age defined in the specification.

h. Adjust the horizontal positioning control

so that the trace starts at a point coincident with a

major graticule division. This point is then repre-

sentative of time zero.

i. Increase the sweep rate so that a single

transient spike can be examined in detail.

j. Adjust the. sync controls separately for

the positive and negative going transients so that

not only the recovery waveshape but also as much

as possible of the rise time of the transient is dis-

played.

5-31 The load resistances shown in Figure 5-5 are

the minimum resistances that must be used in order

to preserve the mercury-wetted relay contacts.

Switching of larger load currents can be accom-

plished with mercury pool relays; with this tech-

nique fast rise times can still be obtained, but the

large inertia of mercury pool relays limits the max-

imum repetition rate of load switching and makes

the clear display of the transient recovery charac-

teristic on oscilloscope more difficult.

k. Starting from the major graticule division

representative of time zero, count to the right 50µ-

sec and vertically 10mV. Recovery should be with-

in these tolerances as illustrated in Figure 5-6.

Figure 5-5. Transient Recovery Time Test Setup

Figure 5-6. Transient Recovery Time Waveforms

5-6

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provide a permanent record. A thermometer should

be placed near the supply to verify that the ambi-

ent temperature remains constant during the period

of measurement. The supply should be put in a lo-

cation immune from stray air currents (open doors

or windows, air conditioning vents); if possible,

the supply should be placed in an oven which is

held at a constant temperature. Care must be taken

that the measuring instrument has a stability over

the eight hour interval which is at least an order of

magnitude better than the stability specification of

the power supply being measured. Typically, a

supply may drift Iess over the eight hour measure-

ment interval than during the half-hour warm-up.

5-33 Temperature Coefficient.

Definition: The change in output volt-

age per degree Centigrade change in

the ambient temperature under condi-

tions of constant input ac line voltage,

output voltage setting, and load re-

sistance.

5-34 The temperature coefficient of a power supply

is measured by placing the power supply in an oven

and varying it over any temperature span within its

rating. (Most HP power supplies are rated for oper-

ation from 0°C to 55°C.) The power supply must be

allowed to thermally stabilize for a sufficient period

of time at each measurement temperature.

5-39 To check the output stability, proceed as

follows :

5-35 The temperature coefficient given in the spec-

ifications is the maximum temperature-dependent

output voltage change which will result over any one

degree Centigrade interval. The differential volt-

meter or digital voltmeter used to measure the out-

put voltage change of the supply should be placed

outside the oven and should have a long term sta-

bility adequate to insure that its drift will not affect

the overall measurement accuracy.

a. Connect load resistance and differential

voltmeter as illustrated in Figure 5-2.

b. Turn CURRENT controls fully clockwise.

c. Adjust front panel VOLTAGE controls until

differential voltmeter indicates maximum rated out-

put voltage.

d. Allow 30 minutes warm-up, then record

differential voltmeter reading.

e, After 8 hours, differential voltmeter should

change from reading recorded in Step (d) by less

then the following:

5-36 To check the temperature coefficient, pro-

ceed as follows:

a. Connect load resistance and differential

voltmeter as illustrated in Figure 5-2.

b. Turn CURRENT controls fully clockwise.

c. Adjust front panel VOLTAGE controls until

front panel voltmeter indicates maximum rated out-

put voltage.

6259B, 62600

6261B, 6268B

6269B

5.0mV

8.0mV

14.0mV

5-40 CONSTANT CURRENT TESTS

d. Place power supply in temperature-con-

trolled oven (differential voltmeter remains outside

oven). Set temperature to 30°C and allow 30 minutes

warm-up.

e. Record differential voltmeter reading.

f. Raise temperature to 40°C and allow 30

minutes warm-up.

g. Observe differential voltmeter reading.

Difference in voltage reading between Step (e) and

(g) should be less than the following:

5-41 The instruments, methods, and precautions

for the proper measurement of constant current pow-

er supply characteristics are for the most part iden-

tical to those already described for the measurement

of constant voltage power supplies. There are,

however, two main differences: first, the power

supply performance will be checked between short

circuit and full load rather than open circuit and full

load. Second, a current monitoring resistor is in-

serted between the output of the power supply and

the load.

12mV

22mV

42mV

62599,62600

6261B

6268B, 6269B

5-42 For all output current measurements the cur-

rent sampling resistor must be treated as a four

terminal device. In the manner of a meter shunt,

the load current is fed to the extremes of the wire

leading to the resistor while the sampling terminals

are located as close as possible to the resistance

portion itself (see Figure 5-7). Generally, any cur-

rent sampling resistor should be of the low noise,

low temperature coefficient (Iess then 30ppm/°C)

type and should be used at no more than 5% of its

rated power so that its temperature rise will be

minimized, If difficulty is experienced in obtaining

a low resistance, high current resistor suitable for

current sampling, a duplicate of the sampling resis-

tor used in this unit (A4R123 or A4R123A-A4R123B)

Qutput Stability.

5-37

Definition: The change in output voltage

for the first eight hours following a 30-

minute warm-up period. During the in-

terval of measurement all parameters,

such as load resistance, ambient temp-

erature, and input line voltage are held

constant.

5-38 This measurement is made by monitoring the

output of the power supply on a differential voltme-

ter or digital voltmeter over the stated measurement

interval; a strip chart recorder can be used to

5-7

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Figure 5-7. Current Sampling Resistor Connections

NOTE

When using the HP current sampling

resistor recommended for this instru-

ment, an external fan must be employed

to cool the resistor. This precaution

will maintain the sampling resistance

at a constant value.

may be obtained from the factory.

Figure 5-8.

Constant Current Load Regulation

Test Setup

5-43 Rated Output and Meter Accuracy.

a. Connect test setup shown in Figure 5-8.

b. Turn VOLTAGE controls fully clockwise.

c. Turn on supply and adjust CURRENT con-

trols until front panel ammeter indicates maximum

rated output current.

5-46 Line Regulation.

Definition: The change D IOUT in the

static value of dc output current re-

sulting from a change in ac input volt-

age over the specified range from low

line (usually 207 volts) to high line

d. Differential voltmeter should read 0.5 ±

0.01Vdc.

(usually 253 volts), or from high

line to low line.

5-44 Load Regulation.

Definition: The change D IOUT in the

static value of the dc output current

resulting from a change in load re-

sistance from short circuit to a value

which yields maximum rated output

voltage.

5-47 To check the line regulation, proceed as fol-

lows:

a. Utilize test setup shown in Figure 5-8.

b. Connect variable auto transformer between

input power source and power supply power input.

c. Adjust auto transformer for 207Vac input.

d. Turn VOLTAGE controls fully clockwise.

e. Adjust CURRENT controls until front panel

ammeter reads exactly maximum rated output current.

f. Read and record voltage indicated on dif-

ferential voltmeter.

g. Adjust variable auto transformer for 253V

ac input.

h. Reading on differential voltmeter should

not vary from reading recorded in Step (f) by more

than the following:

5-45

To check the constant current load regulation,

proceed as follows:

a. Connect test setup shown in Figure 5-8.

b. Turn VOLTAGE controls fully clockwise.

c. Adjust CURRENT controls until front panel

meter reads exactly maximum rated out voltage.

d. Read and record voltage indicated on dif-

ferential voltmeter.

e, Short circuit load resistor (RL).

f. Reading on differential voltmeter should

not vary from reading recorded in Step (d) by more

than the following:

6259B, 6269B

6260B, 6261B

6268B

120µV

110µV

134µV

110µv

134µv

120µV

6259B

6260B

6261B

6268B

6269B

5-48 Ripple and Noise.

Definition: The residual ac current which

is superimposed on the dc output current

5-8

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also apply to the measurement of constant current

ripple and noise.

Figure 5-9 illustrates the most

important precautions to be observed when measur-

ing the ripple and noise of a constant current sup-

ply. The presence of a 120Hz waveform on the os-

cilloscope is normally indicative of a correct mea-

surement method. A waveshape having 60Hz as its

fundamental component is typically associated with

an incorrect measurement setup.

5-50 Ripple and Noise Measurement. To check

the ripple and noise, proceed as follows:

a. Connect oscilloscope or RMS voltmeter

as shown in Figures 5-9A or 5-9B.

b. Turn VOLTAGE controls fully clockwise.

Adjust CURRENT controls until front pan-

e 1 ammeter reads exactly maximum rated output cur-

rent.

d. The observed ripple and noise should be

less than:

250µVrms

334µVrms

250µVrms

6259B

6260B

6261B

6268B

6269B

5-51 TROUBLESHOOTING

5-52 Before attempting to troubleshoot this instru-

ment, ensure that the fault is with the instrument

and not with an associated circuit. The perform-

ance test (Paragraph 5-5) enables this to be deter-

mined without having to remove the instrument from

the cabinet.

5-53 A good understanding of the principles of op-

eration is a helpful aid in troubleshooting, and it

is recommended that the reader review Section IV

of the manual before attempting to troubleshoot the

unit in detail. Once the principles of operation are

understood, refer to the overall troubleshooting

procedures in Paragraph S-S 6 to locate the symptom

and probable cause.

5-54 The schematic diagram at the rear of the

manual (Figure 7-11) contains normal voltage read-

ings taken at various points within the circuits.

These voltages are positioned adjacent to the ap-

plicable test points (identified by encircled num-

bers). The component location diagrams (Figures

7-1 through 7-8, and Figure 7-10) at the rear of the

manual should be consulted to determine the loca-

tion of components and test points.

Figure 5-9. Constant Current Ripple and Noise

Test Setup

of a regulated power supply. AC ripple

and noise current is usually specified

and measured in terms of its RMS

value.

5-55 If a defective component is located, replace

it and re-conduct the performance test. When a

component is replaced, refer to the repair and re-

placements (Paragraph 5-71) and adjustment and

calibration (Paragraph 5-73) sections of this man-

u a l

Most of the instructions pertaining to the

s -49

ground loop and pickup problem-s associated with

constant voltage ripple and noise measurement

5-9

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5-56 OVERALL TROUBLESHOOTING PROCEDURE

al procedure. ) If the trouble source cannot be de-

tected by visual inspection, re-install the main

circuit board and proceed to Step (2).

5-57 To locate the cause of trouble, follow Steps

1, 2, and 3 in sequence:

(1) Check for obvious troubles such as trip-

ped circuit breaker, defective power cord, incor-

rectly strapped rear terminals, input power failure

(2) In almost all cases, the trouble can be

caused by incorrect dc bias or reference voltages;

thus, it is a good practice to check the voltages

in Table 5-2 before proceeding with Step (3). Re-

fer to Figure 7-10 for the location of the test points

listed in Table 5-2.

Next, remove the top and bot-

or defective meter.

tom covers and inspect for open connections,

charred components, etc. , paying particular atten-

tion to both sides of the main circuit board. (Refer

to Paragraph 5-64 for the main circuit board remov-

(3) Disconnect load and examine Table 5-3

to determine your symptom and its probable cause.

Table 5-2. Reference and Bias Voltages

(Refer to Schematic and Figure 7-10 for test point locations)

METER

POSITIVE

METER

COMMON

NORMAL

VDC

NORMAL

RIPPLE (P-P)

STEP

PROBABLE CAUSE

TP63

+12.4 ± 7%

CR61, CR62, Q60, Q61, Q62,

Q63

2.0mV

TP64

TP65

TP66

TP67

+6.2 ±5%

-6.2 ± 5 %

0.5mV

2.0mV

2.0V

VR60, VR61, Q62, Q63

C44, CR53, CR54

+11 ±15%

-4.0 ± 12. 5%

0.8V

C44, CR53, CR54, CR45, CR46,

CR47, CR48, CR49

TP68

-2.4±12.5%

0.4V

CR54, CR45, CR46, CR47,

CR48, CR49

Table 5-3.

Overall Trouble shooting

PROBABLE CAUSE

SYMPTOM

Low or no output voltage

a. Front panel meter defective.

(Overvoltage lamp may be on or off)

b. Crowbar not reset or defective. Refer to Table 5-4.

Series regulator or preregulator feedback loop defective.

Refer to Table 5-4.

Front panel meter defective.

High output voltage

b. Open circuit between sensing terminals (*S) and output ter-

minals (*OUT).

Refer to Table 5-4.

c. Series regulator or preregulator loop defective. If crowbar

does not trip, it also is faulty. Refer to Table 5-4.

a. Ground loops in operating setup. Refer to Paragraph 5-15.

High ripple

b. Incorrect reference and\or bias voltages. Refer to Table

5-2.

c. Supply crossing over to constant current operation under

loaded conditions.

Check current limit setting or constant

5-10

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Table 5-3.

Overall Troubleshooting (Continued)

PROBABLE CAUSE

SYMPTOM

High ripple (continued)

Poor line regulation

current comparator circuit (Z1 and associated components).

a. Improper measurement technique. Refer to Paragraph 5-13.

b. Incorrect reference and/or bias voltages. Refer to Table

5-2.

Improper measurement technique. Refer to Paragraph 5-11.

Poor load regulation

(Constant voltage)

b. Incorrect reference and/or bias voltages. Refer to Table

5-2.

Check constant current compara-

tor circuit (Z1 and associated components).

c. Supply current limiting.

Improper measurement technique. Refer to Paragraph 5-44.

Poor load regulation

(Constant current)

b. Incorrect reference and/or bias voltages. Refer to Table

5-2.

Supply voltage limiting. Check constant voltage compa-

rator circuit (Z1 and associated components) and voltage

clamp circuit, Q1.

d. Leaky C19, A3C3.

a. Adjustment of R47.

Refer to Paragraph 5-99.

Oscillates

(Constant current\constant voltage)

b. Faulty C40, C41, C19, A3C3, R50.

c. Open sensing Iead (+S).

Instability

(Constant current/constant voltage)

a. Incorrect reference and/or bias voltages; CR92 defective.

Refer to Table 5-2.

b. Noisy voltage or current controls (A5R121, A5R122, or

A5R123, A5R124); noisy VR60 or VR61.

Integrated circuit Z1 defective.

d. CR4, CR5, CR6, or CR21 leaky.

e. R2, R3, R4, R5, R6, R22, R30, R31, C2 noisy or drifting.

a. Q20 shorted.

Cannot reach maximum output

One or more of series regulator transistors

(A4Q103 through A4Q108) open,

isolated to either one.

tain instructions for driving each stage of the

series regulator feedback loop into conduction or

5-58 Table 5-3 contains symptoms and probable

causes of many possible troubles. If either high

or low output voltage is a symptom, Table 5-4

contains the steps necessary to isolate the trouble

to one of the feedback loops and instructions dir-

ecting the tester to the proper table for further iso-

Tables 5-5 and 5-6 con-

cut-off.

By following the steps in these tables,

the fault can be isolated to a circuit or to a com-

ponent.

lation.

Because of the interaction between feed-

back loops, it is necessary to refer to Table 5-4

before proceeding to Tables 5-5, 5-6, or 5-7.

5-60 Table 5-7 contains troubleshooting proce-

dures for the preregulator feedback loop. The

troubleshooting method is based upon comparing

the waveforms shown in Figure 7-9 with those ac-

tually found at the various test points in the pre-

regulator control circuit. As indicated in Table

5-59 Tables 5-5, 5-6, and 5-7 contain trouble-

shooting methods for the series regulator and pre-

regulator feedback loops once the fault has been

5-11

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the supply in order to gain access to components

(such as the series regulator transistors) that are

not mounted on the main circuit board. If this is

the case, refer as necessary to Paragraphs 5-65

through 5-70 for disassembly procedures.

5-7, the circuit is checked by starting with the

output waveform and tracing backwards.

5-61 Performing the tests given in Table 5-5, 5-6,

and 5-7 will usually require partial disassembly of

Feedback Loop Isolation

Table 5-4.

PROBABLE CAUSE

ACTION

RESPONSE

STEP

NOTE: After each step, crowbar should be reset by turning supply off and then on.

a. Tripped.

Inspect LINE circuit breaker.

a. Check rectifier, filter, and

triac for short. Faulty pre-

regulator. Procceed to Step

b. Series regulator loop in

high voltage condition.

Proceed to Step 2.

b. Not tripped;

High voltage output.

c. Proceed to Step 2.

c. Not tripped;

Low voltage output.

a. Check setting of overvolt-

age adjust (A5R125).

Inspect overvoltage lamp on

front pane 1.

On.

Check A4CR110 for short.

Series regulator loop in

high voltage condition.

Proceed to Step 3.

b. Check setting of overvolt-

age adjust (A5R125).

b. Off;

High voltage output.

Check A4CR110 for open,

Q91 for open, Q92 for

Series regulator

short.

loop in high voltage con-

dition. Proceed to Step 3.

Check overvoltage adjust

(A5R125). Check A4CR110

for short. Check Q20 for

for short.

off;

Low voltage output.

Proceed to Step

a. Check each series regula-

tor transistor (A4Q103

through A4Q108) for open.

Then check preregulator

by disconnecting source

and proceeding to Table

5-7.

Isolate fault to either series

regulator or preregulator by

using the following steps:

Output voltage normal.

Variable from O volts

to about 9 volts.

(1) Open the gate lead to

triac A2CR1 by disconnect-

ing either end of resistor

R88 (TP87 or TP88).

(2) Place a small dc pow-

er supply across the input

capacitors (C 101 through

C104). A 0-10V, 2A sup^-

ply is sufficient.

(3) Set external supply to

ten volts.

(4) Vary front panel volt-

age controls.

b. High voltage condition in

b. Output voltage high.

Varying controls has

little or no effect.

series regulator.

Proceed

to Table 5-5. Leave ex-

ternal source connected.

c. Low voltage condition in

series regulator loop.

Proceed to Table 5-6.

Leave external source

connected.

c. Output voltage low,

Varying controls has

little or no effect.

5-12

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Table 5-5. Series Regulator Troubleshooting, High Voltage Condition

PROBABLE CAUSE

RESPONSE

ACTION

STEP

in Table 5-4, Step 3.

external source connected as described

a. Output voltage remains high.

These tests should be made with

a. One or more of A4QI03

through A4Q108 shorted

or A4CR105 shorted.

Check turn-off of series

regulator transistors A4Q103

through A4Q108 by shorting

base (TP101) to emitter

(TP103).

Check A4R150-A4R155.

b. Remove short. Proceed

to Step 2.

b. Output voltage decreases.

a. A4Q102 shorted.

a. Output voltage remains high.

b. Output voltage decreases.

Check turn-off of driver

A4Q102 by shorting base

(TP100) to emitter (TP101).

b. Remove short. Proceed

to Step 3.

a. A4Q101 open.

a. Output voltage remains high.

b. Output voltage decreases.

Check conduction of error

amplifierA4Q101 by connect-

ing base (TP45) to cathode

of CR45 (TP67) through a

b. Remove resistor. Pro-

ceed to Step 4.

100

W resistor.

a. Q42 open.

a. Output voltage remains high,

b. Output voltage decreases.

Check conduction of error

amplifier Q42 by connecting

base (TP44) to cathode of

b. Remove resistor. Pro-

ceed to Step S.

CR45 (TP67) through a 1K

resistor.

a. Q41 shorted.

Check turn-off of mixer am-

plifier Q41 by connecting

base (TP40) to +11 volt sup-

a. Output voltage remains high.

b. Output voltage decreases.

b. Remove resistor. Pro-

ceed to Step 6.

ply (TP66) through a 1K

resistor.

a. Z1 defective, R110

shorted.

Check turn-off of constant

voltage comparator Z 1 by

shunting R 1 with a 10K W re-

sistor, or by installing a

10K W resistor in R1 position

if resistor is not installed

in the supply.

a. Qutput voltage remains high.

b. Output voltage decreases.

b. R23 open, open strap

between A 1 and A2,

A5R121 or A5R122 open.

Table 5-6. Series ReguIator Troubleshooting, Low Voltage Condition

PROBABLE CAUSE

RESPONSE

STEP

ACTION

These tests should be made with external source connected as described in Table 5-4, Step 3.

a. A4Q103 throughA4Q108

open and/or A4R150

through A4R155 open,

A4CR106 shorted.

Check conduction of series

regulator transistors A4Q103

through A4Q108 by connect-

ing base (TP101) to +11 volt

supply (TP66) through a 100

ohm resistor.

a. Output voltage remains low.

Remove resistor. Pro-

ceed to Step 2.

b. Output voltage rises.

5-13

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Table 5-6.

Series Regulator Troubleshooting, Low Voltage Condition (Continued)

STEP

ACTION

PROBABLE CAUSE

RESPONSE

Check conduction of driver

A4Q102 by shorting A4Q101

emitter (TP100) to base

(TP45).

a. Output voltage remains low.

a. A4Q102 open, thermal

switch A4TS101 open.

b. Output voltage rises.

b. Remove short. Proceed

to Step 3.

Check turn-off of error am-

plifier A4Q10 1 by connecting

base (TP45) to Q42 base

(TP44).

a. A4Q101 or CR44 shorted.

a, Output voltage remains low.

b. Output voltage rises.

b. Remove short. Proceed

to Step 4.

a. Output voltage remains low,

b. Output voltage rises.

a. Q42 shorted.

Check turn-off of error am-

plifier Q42 by connecting

base (TP44) to +11V supply

b. Remove resistor. Pro-

teed to Step 5.

(TP66) through a 1K

W resistor.

a. Z1 defective, open

strap between A6 and

A7, or shorted A5R123

or A5R124.

Isolate fault to either con-

stant voltage comparator or

constant current comparator

by opening the cathode of

CR20.

a, Output voltage rises.

b. Output voltage remains low.

b. Reconnect lead and

proceed to Step 6.

a. Q41 or CR40 open, Q40

shorted.

Check conduction of mixer

amplifier Q41 by connecting

base (TP40) to +S terminal.

a. Output voltage remains low.

b. Output voltage rises.

b. Remove short. Proceed

to Step 7.

a. Output voltage remains low.

b. Output voltage rises.

a. Z1 defective, R1

shorted.

Check conduction of con-

stant voltage comparator Z 1

by shunting R110 with a 10K

ohm resistor, or by installing

a 10K W resistor in R110 po-

sition if resistor is not in-

stalled in the supply.

b. A5R121 and A5R122

shorted, open strap’

between AZ and A3, R5

open, C2 shorted, CR7

shorted.

Preregulator Troubleshooting (Refer to Waveforms in Figure 7-9)

PROBABLE CAUSE

Table 5-7.

RESPONSE

ACTION

STEP

A differential oscilloscope must be used for these tests in order to avoid a potentially

Floating a single-ended oscilloscope for these tests is not

dangerous shock hazard.

recommended, because it may result in the oscilloscope chassis being at 230Vac line

potential.

a. Defective A2CR1, R88,

a. Normal waveform.

Connect oscilloscope be-

CR88, A2L1A/A2L1B,

T1, A2C1, A2R1.

tween TP89 (+) and TP86 (-).

b. Proceed to Step 2.

b. Little or no voltage.

5-14

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Table 5-7. Preregulator Troubleshooting (Continued)

STEP

ACTION

PROBABLE CAUSE

Defective T70.

RESPONSE

a. Normal waveform.

Connect oscilloscope be-

tween TP85 (+) and TP103

(-).

b. Defective Q72, Q73,

CR76, or C71. pro-

ceed to Step 3.

b. Little or no voltage.

Amplitude incorrect.

Connect oscilloscope be-

tween TP80 (+) and TP103

(-).

Defective Q71, C70,

C72, CR74, CR75,

R82, R75, or R78.

b. Period incorrect.

b. CR78 defective. Pro-

ceed to Step 4.

Defective CR82,

CR84, CR79, CR80,

CR77, CR78. Check

R87.

Connect oscilloscope be-

tween TP82 (+) and TP103

( - ) .

a. Amplitude, dc reference or

period incorrect.

a. Defective CR81,

CR83, R86, R83,

C73.

Connect oscilloscope be-

tween TP81 (+) and TP103

(-) .

a. Amplitude, dc reference or

period incorrect.

b. Front panel may now be swung outward,

hinging on wires to LINE circuit breaker. Access

is provided to all panel-mounted components.

5-62 DISASSEMBLY PROCEDURES

5-63 The following seven paragraphs describe

procedures for removing and disassembling the

five subassemblies in this supply (A1 main circuit

board, A2 RFI assembly, A3 interconnection circuit

board, A4 heat sink, and A5 front panel). These

procedures are referenced throughout the manual

wherever necessary. For example, in the instruc-

tions for converting the supply to 115Vac opera-

tion, reference is made to the RFI assembly remov-

al procedure in order to allow access to the bias

transformer (A3T2) primary connections.

5-66 Main Filter Capacitor Bank Removal. To re-

move the main filter capacitors (Cl 01 through

C104), proceed as follows:

a. Unplug unit, remove top and bottom cov-

ers of supply.

b. Remove one long screw and hold-down

bracket on top of supply (arrowed “A” in Figure

7-3), and one long screw and hold-down bracket

on bottom of supply (arrowed “A” in Figure

7-4).

ircult Board (Al) Removal. To remove

the main printed circuit board, proceed as follows:

a. Unplug unit and remove top cover of

supply.

b. Remove six hold-down screws visible on

component side of main circuit board (arrowed “A”

through “F” in Figure 7-1 O).

c. Unplug board from receptacle mounted on

interconnection circuit board by gently pulling on

finger hole in opposite end of circuit board. Only

finger hole should be used to remove board; do

not pull on beard-mounted components to aid re-

moval. Care must be taken that rear barrier strip

clears opening in rear panel.

c. Sufficient lead length is provided to al-

low capacitors to be lifted partially out of instru-

ment.

5-64 Main C

5-67 RFI Assembly

(A2) Removal. To remove the

RFI assembly, proceed as follows:

a. Unplug unit, turn supply upside down,

and remove bottom cover.

b. Remove four screws holding RFI heat

sink to mounting brackets (arrowed “A” through

Two of the screws are acces -

“D” in Figure 7-5).

sible through holes in chassis flanges.

C. Lift out RFI assembly and turn over.

d. Remove four screws holding cover to heat

sink (screw holes are arrowed “A” through “ D“ in

This allows access to A2R1, A2C1,

and A2L1A/A2L1B with its jumpers for 115/230 volt

operation.

Remove four screws holding A2L1A/A2LlB

mounting bracket to heat sink. (Two of the screws

Front Panel (A5) Removal. To remove the

Figure 7-1).

5-65

front panel, proceed as follows:

a. Unplug unit, turn supply upside down,

and remove four screws holding handlers to front

panel.

5-15

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unsoldered at this point.

e. Remove mounting nuts from A4CR106 on

left side of heat sink, and from A4CR108 on right

Remove mounting nuts, bolts

are arrowed “E” and “F“ in Figure 7-1.) Lifting

brackets away from heat sink allows access to

triac A2CR1. A magnetized screwdriver is useful

in performing this step.

side of heat sink.

and shoulder washers on transistor A4Q102 on right

side of heat sink (see Figure 7-5).

f. Slide top section of heat sink forward and

off insulating rods.

4) Removal. In order to gain ac-

5-68 Heat Sink (A

cess to the following components, it is necessary

to remove the heat sink assembly. Transistors

A4Q101 through A4Q108; diodes A4CR1OI through

A4CR106, A4CR108, and A4CR110; resistors

A4R106, A4R123, and A4R150 through A4R155; ca-

pacitors A4C1 through A4C5; cooling fan A4B1; and

Remove four screws holding emitter re-

sistor circuit board to bottom half of heat sink. A

magnetized screwdriver is useful here. Access is

now provided to series regulator emitter resistors

A4R150 through A4R155 (see Figure 7- 6).

h. If necessary to completely remove emit-

ter resistor circuit board, unsolder connections to

board, marking wires to enable correct replacement,

and remove board.

For the location of these

thermal switch A4TS101.

components, see Figures 7-5, 7-6, 7-7, and 7-8.

To remove the heat sink assembly, proceed as fol-

lows:

Unplug unit, stand it on left side, and

remove top and bottom covers.

b. Remove main printed circuit board as

described in Paragraph 5-64.

5-70 Interconnection Circuit Board (A3) Removal.

To replace capacitor A3C3 or transformer A3T2,

(shown in Figure 7- 2), it is necessary to remove

the interconnection circuit board by utilizing the

following procedure:

Remove two screws holding upper edge

of heat sink to upper chassis flange (arrowed “E”

and “F” in Figure 7-D).

d. Disengage two pins holding lower sec-

tion of heat sink assembly to main circuit board

support tray by sliding heat sink down about ½

inch and slightly away from chassis. Before fully

removing heat sink assembly, observe lead dress

so assembly may be returned easily to correct po-

s it ion.

e. Maneuver heat sink assembly down-

wards and away from chassis until it is resting on

table (sufficient lead length is provided). Gentle

leverage with a thin screwdriver may be necessary

to allow heat sink assembly to clear upper chassis

Remove main circuit board, RFI assembly,

and heat sink assembly as described in Paragraphs

5-64, 5-67, and 5-68 respectively.

b. Remove six screws holding back panel to

chassis frame.

c. Stand supply on left side, and remove

two screws holding main circuit board support tray

Move panel away from frame.

to back panel.

d. Remove two screws holding main circuit

board support tray to internal chassis divider.

Working from top rear of supply, inter-

connection circuit board (still attached to main

circuit board support tray) can be angled up enough

to allow access.

Access is now provided to all components

flange.

mounted on heat sink except resistors A4R150

through A4R155, and A4R123,

f. If necessary to completely remove inter-

connection circuit board, remove two screws hold-

ing board to support tray, one screw holding ca-

pacitor clamp (A3C3) to support tray, and two

screws holding bias transformer (A3T2) to support

tray. Unsolder connections to board, marking

wires to enable correct replacement, and remove

board.

5-69 Heat Sink (4) Disassembly. To gain access

to resistors A4R123 and A4R150 through A4R155

(shown in Figures 7-6 and 7-8) it is necessary to

disassemble the heat sink assembly by utilizing

the following procedure:

a. Remove heat sink assembly as described

in Paragraph 5-68 above.

b. Turn supply upside down and place heat

sink assembly partially into chassis so fan (A4B1)

is protruding above chassis.

5-71 REPAIR AND REPLACEMENT

Remove four screws and four shoulder

5-72 Section VI of this manual contains a list of

replaceable parts. If the part to be replaced does

not have a standard manufacturers’ part number, it

is a “special” part and must be obtained directly

from Hewlett-Packard. After replacing a semicon-

ductor device, refer to Table 5-8 for checks and

adjustments that may be necessary. All compo-

nents listed in Table 5-8 without A-designators are

on the main printed circuit board (Al).

washers attaching fan mounting plate to heat sink.

Do not remove fan from mounting plate. When re-

assembling heat sink, do not overtighten these

screws. Too much tension will damage the insu-

lating rods.

d. Remove two screws holding current sam-

pling resister A4R123 to topmost two portions of

heat sink.

If necessary, the resistor may be

5-16

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TM 11-6625-2958-14&P

Table 5-8. Checks and Adjustments After Replacement of Semiconductor Devices

FUNCTION OR CIRCUIT

REFERENCE

CHECK

ADJUST

Constant voltage and con-

stant current differential

amplifiers.

Constant voltage (CV) line and load reg-

uIation. Zero volt output.

R110, or

R113 (OP-

tion 020);

R117, or

R119

Constant current (CC) line and load reg-

ulation. Zero current output.

(Option

021)

- - -

Voltage clamp circuit.

Short circuit protection.

Mixer amplifier.

CC load regulation.

Q20

Output current, protection action.

Q40, Q41

R47

CV/CC load reguIation. CV transient

response.

- - -

CV/CC load regulation.

Driver and error amplifiers.

Reference regulator.

Overvoltage limit.

Q42, A4Q101,

A4Q102

- - -

Q60, Q61,

Q62, Q63

+12.4V, +6.2V, and -6.2V reference volt-

ages and reference circuit line operation.

- - -

Q70

Limiting action and level.

Q71, Q72,

Q73

Preregulator control cir-

cuit.

Output voltage, rippIe imbalance, and

preregulator waveforms.

R70, R82

A5R125

- - -

Q90, Q91,

Q92

Crowbar action, trip voltage, voltage

across series regulator when tripped.

Crowbar.

A4Q103 thru

A4Q108

CV/CC load regulation.

Series regulator.

R7O

A42CR1

Output voltage.

Preregulator.

- - -

CV/CC crossover operation.

CC load regulation.

CR1, CR20

CR2, CR3

CV/CC OR gate.

Voltage clamp circuit.

- - -

Temperature coefficient.

CR4, CR40,

CR41

Temperature stabilizing

diodes.

- - -

CV/CC load regulation.

CR5, CR6,

CR21

Limiting diodes.

Reference regulator.

Turn-on circuit.

Bias supply.

- - -

+12.4V, +6.2V, and -6.2V reference

voltages.

CR7, CR60,

CR61, CR62

Preregulator control turn-on delay.

CR35, CR36,

CR37

+11V, -4V, and -2.4V bias voltages.

CR43, CR45

thru CR49,

CR53, CR54

- - -

Down-programming speed, CV/CC

load regulation.

CR44, CR50

Driver and error amplifier.

5-17

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TM 11-6625-2958-14&P

Table 5-8. Checks and Adjustments After Replacement of Semiconductor Devices (Continued)

REFERANCE

ADJUST

- - -

FUNCTION OR CIRCUIT

CHECK

Limiting action and level.

R70, R82

Output voltage, ripple imbalance, and

preregulator waveforms.

Crowbar.

Trip voltage, voltage across series regu-

lator when crowbar is tripped, supply

stability.

R95,

A5R125

CR90 thru

CR93,

A4CR108,

A4CR110

- - -

A4CR101 thru Main rectifier diodes.

A4CR104

Voltage across main filter capacitors.

Output voltage.

Reverse voltage protection.

A4CR105

and

A4CR106

- - -

VR1

Voltage clamp circuit.

CC load regulation.

VR40

Mixer amplifier stabiliza-

tion diode.

R47

CV transient response.

- - -

+6.2V and -6.2V reference voltages.

Trip voltage.

R95,

A5R125

5-73 ADJUSTMENT AND CALIBRATION

slightly in order to free adjustment screw from

meter suspension. Pointer should not move during

latter part of adjustment.

5-74 Adjustment and calibration may be required

after performance testing, troubleshooting, or re-

Perform only those adjust-

pair and replacement.

5-77 VOLTMETER CALIBRATION

ments that affect the operation of the faulty cir-

5-78 To calibrate the voltmeter, proceed as fol-

lows:

cuit and no others.

5-75 METER ZERO

Connect differential voltmeter across

supply, observing correct polarity.

b. Turn on supply and adjust VOLTAGE con-

trols until differential voltmeter reads exactly the

maximum rated output voltage.

c. Adjust R106 until front panel voltmeter

also indicates exactly the maximum rated output

voltage.

.5-76 The meter pointer must rest on the zero cal-

ibration mark on the meter scale when the instru-

ment is at normal operating temperature, resting

in its normal operating position, and turned off.

To zero set the meter proceed as follows:

Figure 5-2.

b. Turn on instrument and allow it to come

Connect load resistor of value shown in

5-79 AMMETER CALIBRATION

up to normal operating temperature (about 30 min-

utes).

5-80 To calibrate the ammeter, proceed as fol-

lows:

Wait one minute for

c. Turn instrument off.

power supply capacitors to discharge completely.

d. Insert sharp pointed object (pen point or

awl) into small indentation near top of round black

plastic disc located directly below meter face.

e. Rotate plastic disc clockwise until me-

ter reads zero, then rotate counterclockwise

b. Turn VOLTAGE controls fully clockwise.

Connect test setup shown in Figure 5-8.

Turn on supply and adjust CURRENT con-

trols until differential voltmeter reads 0.5Vdc.

d. Adjust R101 until front panel ammeter in-

dicates exactly maximum rated output current.

5-18

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5-81 CONSTANT VOLTAGE PROGRAMMING

CURRENT

voltage programming.

Perform Steps (a) and (b) in Paragraph

5-83.

b. Rotate CURRENT controls fully clockwise

and turn on supply.

c. If reading on differential 1 voltmeter is not

exactly zero volts, adjust potentiometer R113 (la-

beled "VOLTAGE ZERO" and accessible through

hole in’ rear panel) until reading is exactly zero.

5-82 Zero Output Voltage. To calibrate the zero

voltage programming accuracy, proceed as direct-

ed in Paragraphs 5-83, 5-84, 5-85, or 5-86,

whichever applies to your particular instrument.

5-83 Standard instrument with resistance or unity-

gain voltage programming.

5-86 Option 020 with non-unity gain voltage pro-

gramming.

a. Perform Steps (a) and (b) in Paragraph

5-83.

b. Rotate CURRENT controls fully clockwise

and turn on supply.

c. If reading on differential voltmeter is not

exactly zero volts, adjust potentiometer R112 (la-

beled “VOLTAGE PROG” and accessible through

hole in rear panel) until reading is exactly zero.

a. Connect differential voltmeter between

+OUT and -OUT bus bars.

b. If unit is to be used in local program-

ming mode, turn VOLTAGE controls fully counter-

clockwise. If unit is to be used in remote pro-

gramming mode, connect remote programming setup

(Figure 3-3 or 3-4) and adjust remote resistance or

voltage to zero (minimum).

Connect decade resistance box between

pads of position marked for resistor R110 in “ZERO

ADJUST” section of main circuit board (points “A”

and “B” in Figure 5-10; also see Figure 7-10).

d. Rotate CURRENT controls fully clockwise

and turn on supply.

e . Adjust decade resistance box until dif-

ferential voltmeter reads exactly zero volts.

f. Replace decade resistance box with

fixed, metal film, 1%, 1/4 or 1/8 watt resistor of

same value.

5-87 CV Programming Accuracy. To caIibrate the

constant voltage programming current, proceed as

directed in Paragraphs 5-88 or 5-89, whichever

applies to your particular instrument.

5-88 Standard instrument.

a. Connect 0.1%, 1/8 watt resistor of value

shown below between terminals -S and A3 on rear

barrier strip.

5-84 Standard instrument with non-unity gain

voltage programming.

Model

62596

62606

62616

6268B

62696

Value

2K W

Perform Steps (a) and (b) in Paragraph

2K W

4K W

8K W

5-83.

b. Solder jumper between “wiper” pad and

“+12.4V” pad of position marked for potentiometer

R112 in “ZERO ADJUST” section of main circuit

board (points “C” and “ D“ in Figure 5-10; also

see Figure 7-10).

b. Disconnect strap between terminals Al

and A2 on rear barrier strip.

c. Connect decade resistance box between

pads marked for resistor R111 in “ZERO ADJUST”

section of main circuit board (points “ E“ and “ F“

in Figure 5-10; also see Figure 7-10).

d. Perform Steps (d) through (f) in Paragraph

5-83.

c. Connect differential voltmeter between

+OUT and -OUT bus bars.

d. Connect decade resistance box in place

of R3 (mounted on standoffs on main circuit board;

see Figure 7-10).

and turn on supply.

f. Adjust decade resistance box until dif-

Rotate CURRENT controls fully clockwise

ferential voltmeter indicates exactly maximum

rated output voltage.

g. Replace decade resistance box with

fixed, composition, 5%, 1/2 watt resistor of same

vaIue.

5-89 Option 020.

Perform Steps (a) through (c) in Paragraph

5-88.

Figure 5-10. “ZERO ADJUST” Section of Main

circuit Board

b. Rotate CURRENT controls fully clockwise

and turn on supply.

c. Adjust potentiometer R112 (labeled

“VOLTAGE PROG” and accessible through hole in

rear panel) until differential voltmeter indicates

5-85 Option 020 with resistance or unity-gain

5-19

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exactly maximum rated output voltage.

b. Rotate VOLTAGE controls fully clockwise

and turn on supply.

c. If reading on differential voltmeter is not

exactly zero volts, adjust potentiometer R116 (la-

beled “CURRENT PROG” and accessible through

hole in rear panel) until reading is exactly zero.

5-90 CONSTANT CURRENT PROGRAMMING

CURRENT

5-91 Zero Current OutPut. To calibrate the zero

current programming accuracy, proceed as direct-

ed in Paragraphs 5-92, 5-93, 5-94, or 5-95,

whichever applies to your particular instrument.

5-96 CC Programming Accuracy. To calibrate the

constant current programming current, proceed as

directed in Paragraphs 5-97 or 5-98, whichever

applies to your particular instrument.

5-92 Standard instrument with resistance or

unity-gain voltage programming.

5-97 Standard instrument.

Connect test setup shown in Figure 5-8.

a. Connect test setup shown in Figure 5-8.

b, Disconnect strap between terminals A5

and A6 on rear barrier strip.

b. If unit is to be used in local program-

ming mode, turn CURRENT controls fully counter-

If unit is to be used in remote pro-

clockwise.

Connect 0.1%, 1/8 watt resistor of value

gramming mode, connect remote programming setup

shown below between terminals A4 and A6 on rear

(Figure 3-6 or 3-7) and adjust remote resistance or

voltage to zero. (minimum).

barrier strip.

c. Connect decade resistance box between

Value

Mode 1

6259B

6260B

6261B

6268B

6269B

pads of position marked for resistor R117 in “ZERO

ADJUST” section of main circuit board (points “G”

and “H” in Figure 5-10; also see Figure 7-10).

d. Rotate VOLTAGE controls fully clockwise

and turn on supply.

200

180

200

Adjust decade resistance box until dif-

ferential voltmeter reads exactly zero volts.

f. Replace decade resistance box with

fixed, metal film, 1%, 1/4 or 1/8 watt resistor of

same value.

d. Connect decade resistance box in place

of R30 (mounted on standoffs on main circuit

board; see Figure 7-1 O).

e. Rotate VOLTAGE controls fully clockwise

and turn on supply.

5-93 Standard instrument with non-unity gain

voltage programming.

f. Adjust decade resistance box until dif-

ferential voltmeter indicates exactly 0.5Vdc.

Perform Steps (a) and (b) in Paragraph

Replace decade resistance box with

fixed, composition, 5%, 1/2 watt resistor of same

5-92.

b. Solder jumper between “wiper” pad and

value.

“-6.2V” pad of position marked for potentiometer

R116 in “ZERO ADJUST” section of main circuit

board (points “I” and “J” in Figure 5-10; also see

Figure 7-10).

5-98 Option 021.

Perform Steps (a) through (c) in Paragraph

5-97.

Connect decade resistance box between

b. Rotate VOLTAGE controls fully clockwise

and turn on supply.

c. Adjust potentiometer R116 (labeled “CUR-

pads marked for resistor R115 in “ZERO ADJUST”

section of main circuit board (points “ K“ and “ L“

in Figure 5-1 O; also see Figure 7-10).

RENT PROG” and accessible through hole in rear

panel) until differential voltmeter indicates exactly

0.5Vdc.

Perform Steps (d) through (f) in Paragraph

5-92.

5-94 Option 021 with resistance or unity-gain

voltage programming.

5-99 TRANSIENT RECOVERY TIME

Perform Steps (a) and (b) in Paragraph

5-100 To adjust the transient response, proceed

as follows:

5-92.

b. Rotate VOLTAGE controls fully clockwise

and turn on supply.

a. Connect test setup shown in Figure 5-5.

b. Repeat Steps (a) through (k) as outlined

in Paragraph 5-32.

If reading on differential voltmeter is

not exactly zero volts, adjust potentiometer R119

(labeled “CURRENT ZERO” and accessible through

hole in rear panel) until reading is exactly zero.

Adjust R47 until transient response is

within specification as shown in Figure 5-6.

5-101 RIPPLE IMBALANCE (50 and 60Hz Operation)

5-95 Option 021 with non-unity gain voltage pro-

gramming.

Perform Steps (a) and (b) in Paragraph

5-102 This procedure ensures balanced operation

of the triac by ensuring that the conduction time

5-92.

5-20

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is equal in either direction (within 25%). To check

for imbalance, proceed as follows:

Connect dc voltmeter acress series reg-

ulator (TP102 and TP103).

Connect appropriate Ioad resistance

d. Turn CURRENT controls fully clockwise.

e, To check voltage drop across regulator

at low output voltage, short circuit load resistor

and adjust VOLTAGE controls for maximum rated

output current on front pane 1 ammeter.

across rear output terminals of supply as follows:

Load Resistance

MODEL

6259B

6260B

62610

6268B

6269B

0.2 W 500W, ±5%

O.1 W, 1000W, ±5%

0.4 W, 1000W, ±5%

1.33 W, 1200W, ±5%

0.8 W, 2000W, ±5%

f. Adjust R70 until voltmeter reads 3.5±

0.3Vdc.

g. To check the voltage drop at high output

voltage, remove short circuit from acress load re-

sistor and adjust VOLTAGE controls for maximum

b. Connect variable auto transformer be-

tween input power source and power supply power

input; adjust auto transformer for 230Vac input to

supply.

c. Connect oscilloscope (ac coupled) be-

tween TP102 and TP103 (across series regulator).

d. Turn CURRENT controls fully clockwise,

turn on supply, and adjust VOLTAGE controls for

maximum rated output voltage.

Voltmeter reading should

rated output current.

again be 3.5 ± 0.3Vdc.

h. Vary input line voltage from 207 to 253V

ac. Voltmeter reading should vary between 3.2

(minimum) and 3.8 (maximum) volts. If reading ex-

ceeds this range, proceed with Step (i).

Replace resistor R77 with decade resis-

tance box. Vary input line voltage between 207

and 253Vac while adjusting decade box until volt-

meter reading variation is minimal and within range

e. Adjust oscilloscope to observe 120Hz

sawtooth waveform.

Peak amplitudes of adjacent

sawtooth peaks should be within 25% of each other.

f. If amplitude difference is greater than

25%, turn off supply and replace R82 with decade

resistance.

Rep lace decade box with equiv-

of 3.2 to 3.8Vdc.

alent resistor.

5-105 50Hz OPERATION (Option 005)

Turn on supply and adjust decade resist-

ance to reduce imbalance to within 25%.

h. Vary input line voltage from 207 to 253V

ac and insure that imbalance does not exist any-

5-106 If the supply is to be operated from a 50Hz

ac input, the following modifications are required:

a. Replace resistor R82 with 240 W, ±5%,

1/2 watt resistor, and check ripple imbalance as

described in Steps (a) through (e) of Paragraph

5-101.

where within this range.

equivalent resistor.

Replace decade box with

b. Perform preregulator tracking adjustment

described in Paragraph 5-103.

NOTE

If imbalance cannot be reduced to

within 25%, check capacitors C70 and

C72, and diodes CR79 through CR84.

If these components test satisfactori-

ly, the problem may be due to distor-

tion present on the ac power line.

5-107 CROWBAR TRIP VOLTAGE

5-108 To adjust A5R125 (OVERVOLTAGE ADJUST),

proceed as follows:

Turn screwdriver adjustment, A5R125,

fully clockwise.

b. Turn on supply.

c. Set voltage output to desired trip voltage.

d. Turn A5R125 slowly counterclockwise

until the crowbar is tripped (meter falls to zero

volts).

e. Turn off supply and turn down output

voltage.

5-103 PREREGULATOR

Operation)

TRACKING (50 and 60Hz

5-104 To adjust the voltage drop across the series

regulator, proceed as follows:

a. Connect appropriate load resistance

across rear output terminals of supply as follows:

f. Turn on supply and set desired operating

output voltage.

Model

62S9B

6260B

6261B

6268B

6269B

Load Resistance

500W, ±5%

0.2

NOTE

0.1 W, 1000W, ±5%

0.4 W, 1000W, ±5%

1.33 W, 1200W, ±5%

It is recommended that the crowbar be

set to no less than 5% of the desired

output voltage plus two volts, in or-

der to avoid false tripping of the

crowbar. However, if occasional

crowbar tripping on unloading can be

tolerated, the crowbar trip point can

2000W, ±5%

0.8 W,

b. Connect variable auto transformer be-

tween input power source and power supply power

input adjust auto transformer for 230Vac input to

supply.

5-21

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TM 11-6625-2958-14&P

Value

23Vdc

45Vdc

Model

6261B

6268B

6269B

be set much closer to the operating

output voltage of the supply.

5-109 MAXIMUM CROWBAR TRIP VOLTAGE

Adjust decade resistance box until crow-

bar trips (amber OVERVOLTAGE lamp lights up).

priate value resistor in R95 position and reconnect

resistor R72. Maximum crowbar trip voltage is

now set at voltage given in Step (d).

5-110 To adjust the maximum voltage at which the

crowbar trips, proceed as follows:

a. Rotate A5R125 (OVERVOLTAGE ADJUST)

and CURRENT controls fully clockwise.

b. Disconnect either end of R72 (TP70 or

TP71; see Figure 7-10).

Replace decade resistance with appro-

c. Connect decade resistance box in place

of R95 (mounted on standoffs on main circuit

board).

5-111 CROWBAR DISABLEMENT

d. Turn on supply and adjust VOLTAGE con-

trols for output voltage shown below:

5-112 To disable the crowbar completely, discon-

nect either end of R98 (TP97 or TP98). This resis-

tor is mounted on the main circuit board (see Fig-

ure 7-10).

Model

6259B

6260B

Value

12Vdc

5-22

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TM 11-6625-2958-14&P

SECTION VI

REPLACEABLE PARTS

6-1 INTRODUCTION

Table 6-1.

Reference Designators (Continued)

6-2 This section contains information for ordering

replacement parts. Table 6-4 lists parts in alpha-

numeric order by reference designators and provides

the following information:

= plug

= transistor

= resistor

= switch

= transformer

= terminal block

= therms 1 switch

. vacuum tube,

neon bulb,

photocell, etc.

= zener diode

= socket

= integrated cir-

cuit or network

a. Reference Designators. Refer to Table 6-1.

b. Description.

breviations.

Refer to Table 6-2 for ab-

c. Total Quantity (TQ). Given only the first

time the part number is listed except in instruments

containing many sub-modular assemblies, in which

case the TQ appears the first time the part number

is listed in each assembly.

Table 6-2. Description Abbreviations

d. Manufacturer’s Part Number or Type.

Manufacturer’s Federal Supply Code Num-

ber. Refer to Table 6-3 for manufacturer’s name and

address.

= ampere

= alternating

current

= assembly

= board

= bracket

= degree

Centigrade

= card

= coefficient

mf r

= manufacturer

mod. = modular or

modified

f. Hewlett-Packard Part Number.

mtg = mounting

ass y.

bkt

°C

= nano =10-⁹

g. Recommended Spare Parts Quantity (RS)

for complete maintenance of one instrument during

one year of isolated service.

h. Parts not identified by a reference desig-

nator are listed at the end of Table 6-4 under Me-

= normally closed

= normally open

= nickel-plated

= ohm

coef

chanical and/or Miscellaneous.

The former consists

obd

= order by

comp = composition

CRT = cathode-ray

tube

of parts belonging to and grouped by individual as-

semblies; the latter consists of all parts not im-

mediately associated with an assembly.

description

= outside

diameter

= pico =10-¹²

= printed circuit

= center-tapped

= direct current

P.C.

6-3 ORDERING INFORMATION

DPDT = double pole,

pot. = potentiometer

double throw

DPST = double pole,

single throw

= peak-to-peak

= parts per

million

= peak reverse

voltage

P-P

ppm

6-4 Table 6-5 is a part number-national

stock number cross reference index.

The

items on this cross reference index are

source coded PAHZZ. Items that do not

elect = electrolytic

pvr

encapsulated

encap =

appear on this cross reference index are

source coded XD and shall be procured

using the FSCM and the NPN at the near-

est wholesale level.

= farad

= degree

rect = rectifier

rms

= root mean

square

= silicon

Farenheit

= fixed

= germanium

= Henry

fxd

SPDT = single pole,

double throw

= Hertz

= integrated

circuit

SPST = single pole,

single throw

Table 6-1. Reference Designators

= small signal

= slow-blow

= tantulum

= titanium

= volt

= inside diameter

= assembly

= blower (fan)

= capacitor

= circuit breaker

= diode

= device, signal-

ing (lamp)

= miscellaneous

electronic part

= fuse

= jack, jumper

= relay

= inductor

= meter

incnd =

incandescent

tan.

= kilo =10³

10-³

= mini =

= mega = 10⁶

= variabIe

= wirewound

= Watt

var

= micro = 10^-6

met. = metal

6-1

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TM 11-6625-2958-14&P

Table 6-3.

Code List of Manufacturers

CODE

MANUFACTURER

NO.

ADDRESS

MANUFACTURER

ADDRESS

NO.

00629 EBY Sales Co. , Inc.

00656 Aerovox Corp.

00853 Sangamo Electric Co.

S. Carolina Div.

01121 Allen Bradley Co.

01255 Litton Industries, Inc.

07138 Westinghouse Electric Corp.

Electronic Tube Div.

07263 Fairchild Camera and Instrument

Corp. Semiconductor Div.

Jamaica, N. Y.

New Bedford, Mass.

Elmira, N. Y.

Pickens, S. C.

Milwaukee, Wis.

Mountain View, Calif.

07387 Birtcher Corp-,The

Los Angeles, Calif.

07397 Sylvania Electric Prod. Inc.

Sylvania Electronic Systems

Beverly Hills, Caltf.

01281 TRW Semiconductors, Inc.

Western Div.

07716 IRC Div. of TRW Inc. Burlington Plant

Burlington, Iowa

07910 Continental Device Corp.

Hawthorne, Calif.

Lawndale, Calif.

Mountain View, Calif.

01295 Texas Instruments, Inc.

Semiconductor-Components Div.

Dallas, Texas

01686 RCL Electronics, Inc.

01930 Amerock Corp.

02107 Sparta Mfg. Co.

02114 Ferroxcube Corp.

02606 Fenwal Laboratoriess

02660 Amphenol Corp.

Manchester, N. H.

Rockford, 111.

07933 Raytheon Co. Components Div.

Semiconductor Operation

Dover, Ohio

Mountain View, Calif.

Saugerties, N. Y.

Morton Grove, Ill.

Broadview, Ill.

08484 Breeze Corporations, Inc.

08530 Reliance Mica Corp.

08717 Sloan Company, The

08730 Vemaline Products Co. Inc. Wyckoff, N. J.

08806 General Elect. Co. Minia-

Union, N. J.

Brooklyn, N. Y.

02735 Radio Corp. of America, Solid State

and Receiving Tube Div. Somerville, N. J.

03508 G. E. Semiconductor Products Dept.

Syracuse, N. Y.

03797 Eldema Corp.

Compton, Calif.

03877 Transitron Electronic Corp.

Wakefield, Mass.

03888 Pyrofilm Resistor Co. Inc.

Cedar Knolls, N. J.

04009 Arrow, Hart and Hegeman Electric Co.

Hartford, Corm.

Sun Valley, Calif.

ture Lamp Dept.

08863 Nylomatic Corp.

08919 RCH Supply Co.

Cleveland, Ohio

Norrisville, Pa.

Vernon, Calif.

09021 Airco Speer Electronic Components

Bradford, Pa.

09182

*Hewlett-Packard Co. New Jersey Div.

Rockaway, N. J.

09213 General Elect. Co. Semiconductor

04072 ADC Electronics, Inc. Harbor City, Calif,

04213 Caddell & Bums Mfg. Co. Inc.

Mineola, N. Y.

*Hewlett-Packard Co. Palo Alto Div,

Palo Alto, Calif,

04713 Motorola Semiconductor Prod. Inc.

Phoenix, Arizona

05277 Westinghouse Electric Corp.

Prod. Dept.

Buffalo, N. Y.

09214 General Elect. Co. Semiconductor

Prod. Dept.

09353 C & K Components Inc.

09922 Burndy Corp.

11115 Wagner Electric Corp.

Tung-Sol Div.

11236 CTS of Berne, Inc.

Auburn, N. Y.

Newton, Mass.

Norwalk, Corm.

04404

Bloomfield, N. J.

Berne, Ind.

11237 Chicago Telephone of Cal. Inc.

Semiconductor Dept.

Youngwood, Pa.

Grand Junction, Colo.

Wakefield, Mass.

05347 Ultronix, Inc.

05820 Wake field Engr. Inc.

So. Pasadena, Calif.

11502 IRC Div. of TRW Inc. Boone Plant

Boone, N.C.

06001 General Elect, Co. Electronic

Capacitor & Battery Dept.

Irmo, S. C.

11711 General Instrument Corp

06004 Bassik Div. Stewart-Warner Corp.

Rectifier Div.

Newark, N. J.

Camden, N. J.

Cincinnati, Ohio

Lake Mills, Wisconsin

12136 Philadelphia Handle Co. Inc.

Bridgeport, Corm.

06486 IRC Div. of TRW Inc.

Semiconductor Plant

Lynn, Mass.

12615 U. S. Terminals, Inc.

12617 Hamlin Inc.

12697 Clarostat Mfg. Co. Inc.

13103 Thermally Co.

*Hewlett-Packard Co. Loveland Div.

Loveland, Colo.

14655 Comell-Dubilier Electronics Div.

Federal Pacific Electric Co.

06540 Amatom Electronic Hardware Co. Inc.

New Rochelle, N. Y.

06555 Beede Electrical Instrument Co.

Penacook, N. H.

Dover, N. H.

Dallas, Texas

14493

06666 General Devices Co. Inc.

Indianapolis, Ind.

06751 Semcor Div. Components, Inc.

Phoenix, Arizona

New Albany, Ind.

06812 Torrington Mfg. Co. , West Div.

Van Nuys, Calif.

07137 Transistor Electronics Corp.

Minneapolis, Minn.

Newark, N. J.

06776 Robinson Nugent, Inc.

14936 General Instrument Corp. Semicon-

ductor Prod. Group Hicksville, N. Y.

15801 Fenwal Elect.

Framingham, Mass.

16299 Corning Glass Works, Electronic

Raleigh, N. C.

Components Div.

*Use Code 28480 assigned to Hewlett-Packard Co. , Palo Alto, California

6-2

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TM 11-6625-2958-14&P

Table 6-3. Code List of Manufacturers (Continued)

CODE

NO.

MANUFACTURER

ADDRESS

MANUFACTURE R

ADDRESS

NO.

Delco Radio Div. of General Motors Corp.

Kokomo, I.nd.

16758

70563 Amperite Co. Inc.

70901 Beemer Engrg. Co.

70903 Belden Corp.

Union City, N. J.

Fort Washington, Pa.

Chicago, III.

17545 Atlantic Semiconductors, Inc.

71218 Bud Radio, Inc.

Asbury Park, N. J.

Willoughby, Ohio

Fairchild Camera and Instrument Corp

Semiconductor Div. Transducer Plant

Mountain View, Callf.

71279 Cambridge Thermionic Corp.

17803

Cambridge, Mass.

71400 Bussmann Mfg. Div. of McGraw &

Daven Div. Thomas A. Edison Industries

17870

Edison Co.

71450 CTS Corp.

71468 I. T. T. Cannon Electric Inc.

St. Louis, Mo.

EIkhart, Ind.

McGraw-Edison Co.

18324 Slgnetics Corp.

Orange, N. J.

Sunnyvale, Callf.

Bendix Corp. The Navigation and

19315

19701

21520

22229

Los Angeles, Callf.

Globe-Union Inc.

Centralab Div.

71590

Control Div.

Teterboro, N. J.

Electra/Midland Corp.

Milwaukee, Wis.

71700 General Cable Corp. Cornish

Mineral Wells, Texas

Fansteel Metallurgical Corp.

Wire Co. Div.

Coto Coil Co. Inc.

Williams town, Mass.

Providence, R. 1.

71707

No. Chicago, Ill.

Union Carbide Corp. Electronics Div.

Mountain View, Calif.

71744 Chicago Miniature Lamp Works

Chicago, Ill.

71785 Cinch Mfg. Co. and Howard

B. Jones Div.

71984 Dow Coming Corp.

72136 Electro Motive Mfg. Co. Inc.

UID Electronics Corp.

Hollywood, Fla.

22753

23936

24446

Pamotor, Inc.

Pampa, Texas

Chicago, III.

Midland, Mich.

General Electric Co.

Schenectady, N.Y.

24455 General Electric Co. Lamp Div. of Con-

sumer Prod. Group

Willimantic, Corm.

72619 Dialight Corp.

Nela Park, Cleveland, Ohio

Brooklyn, N. Y.

Newark, N. J.

Harwood Heights, Ill.

General Instrument Corp.

72765 Drake Mfg. Co.

72699

24655 General Radio Co.

West Concord, Mass.

24681 LTV Electrosystems Inc Memcor/Com-

ponents Operations

Dynacool Mfg. Co. Inc. Saugerties, N.Y.

27014 National Semiconductor Corp.

Santa Clara, Callf.

72962 Elastic Stop Nut Div. of

Amerace Esna Corp.

72982 Erie Technological Products Inc. Erie, Pa.

Huntington, Ind.

26982

Union, N. J.

73096 Hart Mfg. Co.

73138 Beckman Instruments Inc.

Helipot Div.

Hartford, Corm.

Hewlett-Packard Co.

28480

Palo Alto, Calif.

Kenilworth, N. J.

28520 Heyman Mfg. Co.

28875 IMC Magnetics Corp.

New Hampshire Div.

Fullerton, Calif.

Ashland, Mass.

73168 Fenwal, Inc.

73293

Rochester, N. H.

Hughes Aircraft Co. Elecmon

31514 SAE Advance Packaging, Inc.

Dynamics Div.

Torrance, Calif.

Amperex Electronic Corp.

73445

Santa Ana, Callf.

Budwig Mfg. Co.

31827

Ramona, Calif.

Owensboro, Ky.

Chicago, Ill.

Hicksville, N, Y.

73506 Bradley Semiconductor Corp.

33173 G. E. Co. Tube Dept.

Lectrohm, Inc.

P. R. Mallory & Co. Inc.

35434

37942

New Haven, Corm.

73559 Carling Electric, Inc.

73734 Federal Screw Products, Inc.

Hartford, Corm.

Indianapolis, Ind.

Chicago, 111.

Muter Co.

New Departure-Hyatt Bearings Div.

General Motors Corp.

42190

43334

Chicago, Ill.

Trenton, N. J.

Bridgeport, Corm.

74193 Heinemann Electric Co.

74545 Hubbell Harvey Inc.

Sanclusky, Ohio

Skokie, 111.

Amphenol Corp. Amphenol RF Div.

74868

44655 Ohmite Manufacturing Co.

46384 Penn Engr. and Mfg. COrp.

Danbury, Corm.

Waseca, Minn.

Philadelphla, Pa.

E. F. Johnson Co.

75042 IRC Div. of TRW, Inc.

74970

Doylestown, Pa.

Cambridge, Mass.

Lexington, Mass.

47904 Polaroid Corp.

49956 Raytheon Co.

75183 l Howard B. Jones Div. of Cinch

Simpson Electric Co. Div. of American

55026

Mfg. Corp.

New York, N. Y.

75376 Kurz and Kasch, Inc.

75382 Kilka Electric Corp.

75915 Llttlefuse, Inc.

Gage and Machine Co.

Dayton, Ohio

Mt. Vernon, N. Y.

Des Plaines, Ill.

Chicago, 111.

Sprague Electric Co. North Adams, Mass.

56289

58474 Superior Electrlc Co.

Syntron Div. of FMC Corp.

Bristol, Corm.

76381 Minnesota Mining and Mfg. Co.

58849

St. Paul, Minn.

Bloomfield, N.J.

James Millen Mfg. Co. Inc.

Maiden, Mass.

Compton, Callf.

Homer City, Pa.

Philadelphia, Pa.

New York, N. Y.

Minor Rubber Co. Inc.

76385

76487

59730 Thomas and Betts Co.

Union Carbide Corp.

63743 Ward Leonard Electric Co.

61637

J. W. Miller Co.

76493

Mt. Vernon, N. Y.

l Use Code 71785 assigned to Cinch Mfg. Co. , Chicago, III.

6-3

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TM 11-6625-2958-14&P

CODE

Table 6-3.

Code List of Manufacturers (Continued)

CODE

ADDRESS

MANUFACTURER

ADDRESS

MANUFACTURER

NO.

83508 Grant Pulley and Hardware Co.

West Nyack, N. Y.

76530 Cinch

City of Industry, Calif.

768.54 Oak Mfg. Co. Div. of Oak

Electro/Netics Corp.

77068 Bendix Corp. , Electrodynamics Div.

83594 Burroughs Corp. Electronic

Crystal Lake, III.

Plainfield, N.J.

Components Div.

Morristown, N.J.

No. Hollywood, Calif.

83835 U. S. Radium Corp.

83877 Yardeny Laboratoriess, Inc.

77122 Palnut Co.

77147 Patton -Mac Guyer Co.

77221 Phaostron Instrument and Electronic Co.

South Pasadena, Calif.

Mountainside, N. J.

Providence, R. I.

New York, N.Y.

Great Neck, N.Y

Ogallala, Neb.

84171 Arco Electronics, Inc.

84411 TRW Capacitor Div.

77252 Philadelphia Steel and Wire Corp.

Philadelphia, Pa.

86684 RCA Corp. Electronic Components

Harrison, N. J.

Newark, N, J.

77342 American Machine and Foundry Co.

Potter and Brumfield Div. Princeton, Ind.

77630 TRW Electronic Components Div.

Camden, N. J.

86838 Rummel Fibre Co.

87034 Marco & Oak Industries a Div. of Oak

Anaheim; Calif.

Electro/netics Corp.

87216 Philco Corp. Lansdale Div. Lansdale, Pa.

87585 Stockwell Rubber Co. Inc.

Philadelphia, Pa.

77764 Resistance Products Co.

Harrisburg, Pa.

78189 Illinois Tool Works Inc. Shakeproof Div.

Elgin, Ill.

Bridgeport, Corm.

87929 Tower-Olschan Corp.

78452 Everlock Chicago, Inc.

78488 Stackpole Carbon Co.

Chicago, 111.

St. Marys, Pa.

88140 Cutler-Hammer Inc. Power Distribution

and Control Div. Lincoln Plant

78526 Stanwyck Winding Div. San Fernando

Electric Mfg. Co. Inc. Newburgh, N.Y.

78553 Tinnerman Products, Inc. Cleveland, Ohio

Lincoln, III.

88245 Litton Precision Products Inc, USECO

Div. Litton Industries Van Nuys, Calif.

78584 Stewart Stamping Corp.

79136 Waldes Kohinoor, Inc.

79307 Whitehead Metals Inc.

Yonkers, N. Y.

L.I.C., N.Y.

Metuchen, N,J.

Chicago, III.

90634 Gulton Industries Inc.

90763 United-Car Inc.

New York, N. Y.

91345 Miller Dial and Nameplate Co.

79727 Continental-Wirt Electronics Corp.

El Monte, Calif.

Philadelphia, Pa.

Mt. Kisco, N.Y.

80031 Mepco Div. of Sessions Clock Co.

Morristown, N. J.

Riverside, Calif.

81042 Howard Industries Div. of Msl Ind. Inc.

Racine, Wise.

Chicago, Ill.

Attleboro, Mass.

Columbus, Neb.

Willow Grove, Pa.

91418 Radio Materials Co.

91506 Augat, Inc.

91637 Dale Electronics, Inc.

91662 Elco Corp.

79963 Zierick Mfg. Co.

80294 Bourns, Inc.

91929 Honeywell Inc. Div. Micro Switch

Freeport, Ill.

Schiller Pk. , III.

93332 Sylvania Electric Prod. Inc. Semi-

92825 Whitso, Inc.

81073 Grayhiil, Inc. La Grange, III.

81483 International Rectifier Corp.

Woburn, Mass.

conductor Prod. Div.

93410 Essex Wire Corp. Stemco

Controls Div.

El Segundo, Calif.

81751 Columbus Electronics Corp. Yonkers, N. Y.”

82099 Goodyear Sundries & Mechanical Co. Inc.

New York, N. Y.

82142 Airco Speer EIectronic Components

Du Bois, Pa.

Mansfield, Ohio

94144 Raytheon Co. Components Div.

Quincy, Mass.

Ind. Components Oper.

94154 Wagner Electric Corp.

Tung-Sol Div.

Livingston, N. J.

Lester, Pa.

82219 Sylvania Electric Products Inc.

Electronic Tube Div. Receiving

94222 Southco Inc.

95263 Leecraft Mfg. Co. Inc.

L.I.C., N.Y.

95354 Method Mfg. Co. Rolling Meadows, III,

Tube Operations

82389 Switchcraft, Inc.

82647 Metals and Controls Inc. Control

Emporium, Pa.

Chicago, Ill.

95712 Bendix Corp. Microwave

Devices Div.

35987 Weckesser Co. Inc.

96791 Amphenol Corp. Amphenol

Controls Div.

Franklin, Ind.

Chicago, Ill.

Products Group

82866 Research Products Corp.

82877 Rotron Inc.

82893 Vector Electronic Co.

83058 Cam Fastener Co.

83186 Victory Engineering Corp.

Attleboro, Mass.

Madison, Wis.

Woodstock, N. Y.

Glendale, Calif.

Cambridge, Mass.

Janesville, Wis.

97464 Industrial Retaining Ring Co.

Irvington, N.J.

97702 IMC Magnetics Corp. Eastern Div.

Westbury, N. Y.

Springfield, N. J.

83298 Bendix Corp. Electric Power Div.

Mamaroneck, N. Y.

Cleveland, Ohio

98291 Sealectro Corp.

98410 ETC Inc.

Eatontown, N, J.

Brooklyn, N. Y.

Chicago, Ill.

83501 Gavitt Wire and Cable Div. of

BrookfieId, Mass.

83330 Herman H. Smith, Inc.

83385 Central Screw Co.

38978 ‘International Electronic Research Corp.

Burbank, Calif.

Boston, Mass.

39934 Renbrandt, Inc.

Amerace Esna Corp.

6-4

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TM 11-6625-2958-14&P

Table 6-4.

Replaceable Parts

REF.

DESIG.

MFR.

CODE

PART NO.

DESCRIPTION

MFR. PART NO.

Al MAIN PRINTED CIRCUIT BOARD

Printed Circuit Board, Main

5060-6189

28480

fxd, mylar. 01µF 200V

fxd, elect. 5µF 50Vdc

fxd, elect. 68µF 15Vdc

fxd, elect. 20µF 50Vdc

fxd, mylar .022µF 200Vdc

fxd, elect. 1,400µF 30Vdc

fxd, elect. 4.7µF 35Vdc

fxd, elect. 325µF 35Vdc

fxd, elect. 1µF 35Vdc

fxd, mylar .1µF 200Vdc

fxd, elect. 5µF 50Vdc

fxd, mylar .1µF 200Vdc

C20

C35

C40, 41

C44

C60

C61

C70

0160-0161

0180-0301

0180-1835

0180-0049

0160-0162

0180-1860

0180-0100

0180-0332

0180-0291

0160-0168

.0180-0301

0160-0168

28480

56289

56285

56289

28480

56289

28480

56289

30D505G050BB2

150D686X0015R2

30 D206G050C02

192P22392

150D475X9035B2

150D105X9035A2

192P10492

30D505G050BB2

192P10492

C71

C72, 73

C90

CR1-7,20,

21,35-37

CR40

CR41,43,44

CR42,51,52

CR45-50,

53,54

CR60-62,

70-84,88,

90-93

Diode, Si. 200mA 200prv

Stabistor

Diode, Si 200mA 200prv

NOT ASSIGNED

28480

1901-0033

1901-0460

1901-0033

Diode, Si.

03508

28480

1901-0327

1901-0033

1N5059

Diode, Si. 200mA 200prv

SS PNP Si.

SS NPN Si.

SS PNP Si.

SS PNP Si

SS NPN Si.

SS PNP Si.

SS NPN Si.

SS PNP Si.

SS NPN Si.

1853-0099

1854-0071

1853-0099

1853-0041

1854-0071

1853-0099

1854-0071

1853-009-9

1854-0071

28480

09182

Q20, 40

Q41, 42

Q60

Q61-Q63

Q70, 71

Q72, 73

Q90

Q91, 92

0757-0344

0686-1615

fkd, met. film 1M W ±1% ¼ W

fxd, comp 160 W ±5% ½ W

fxd, comp (selected) +5% ½ W

fxd, ww 680 W ±5%5W

07716

01121

56289

07716

077,16

07716

01121

56289

01121

R20

R21

R22

R23

R24

R25

R26

R27

R28, 29

R30

R31

R35, 36

R37

R40

Type CEB T-O

EB-1615

Type EB (obd)

243E6815

243E6015

242E1025

Type CEA T-0

EB-3955

EB-0335

Type EB (obd)

242E2625

EB-1035

EB-1845

EB-1525

0811-2099

0811-1869

0813-0001

0698-5663

0757-0472

0698-3440

0757-0274

0757-0440

0698-3382

0698-3430

0686-3955

0686-0335

f x d , w w 6 0 0 W ± 5 % 5 W

fxd, ww 1K

± 5% 3W

fxd, met. film 330 W ±1% 1/8W

fxd, met. film 200k W ±1% 1/8W

fxd, met. film 196 W ±1% 1/8W

fxd, met. film 1.21k W ±1% 1/8W

fxd. met. film 7.5K W ±1% 1/8W

fxd, met. film 5.49K

±1% 1/8W

fxd, met. film 21.5K W ±1% 1/8W

fkd, comp 3.9M W ±5%½W

fxd, comp 3.3

fxd, comp (Selected) ±5%½W

±5%½W

0811-1808

0686-1035

0686-1845

0686-1525

fxd, ww 2.6K ±5% 3W

fxd, compp 10k W ± 5 % ½ W

fxd, comp 180k W ± 5 % ½ W

fxd, comp 1.5K

±5%½W

62690

6-5

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TM11-6625-2958-14&P

REF.

DESIG.

MFR.

CODE

PART NO.

DESCRIPTION

fxd, comp 510 ±5% ½W

MFR. PART NO.

EB-5115

Type CEB T-O

243E5005

Type C42S

EB-8215

EB-1025

Type 110-F4

EB-5125

EB-4705

EB-3905

EB-1025

Type CEA T-O

EB-5615

243 E5005

EB-7505

Type BWH

Type 10XM

Type CEA T-O

Type C42S

Type CEB T-O

EB-1045

01121

07716

56289

16299

01121

11236

01121

07716

01121

56289

01121

07716

63743

07716

16299

07716

01121

07716

11236

07716

01121

07716

01121

07716

01121

07716

01121

16299

01121

16299

01121

07716

01121

07716

01121

11236

07716

0686-5115

0698-5146

0811-1854

0698-3609

0686-8215

0686-1025

2100-1824

0686-5125

0686-4705

0686-3905

0686-1025

0757-0460

0686-5615

0811-1854

0686-7505

0811-1673

0811-0942

0757-1100

0757-0440

0698-3626

0698-3207

0757-0739

0686-1045

0686-2045

0686-3335

0698-3382

0757-0440

0698-4440

2100-1824

0698-5088

0698-5091

0686-1235

0686-8235

0757-0437

0686-4345

0757-0270

0686-3925

0757-0436

0698-0001

0686-9125

0686-2705

0686-1045

0686-9125

0698-3629

0698-3338

0686-1005

0698-3637

0689-1815

0811-1763

0686-3925

0686-5115

0757-0427

0686-2045

0698-0001

0686-1005

0686-2045

2100-0439

0757-0422

R41

R42

R43

R44

R45

R46

R47

R48

R49

R50

R51

R52

R53

R54

R56

R57

R58

R60

R61

R62

R63

R64

R65

R66

R67

R68

R69

R69B

R70

R71

R72

R73

R74

R75, 76

R77

R78

R79

R80

R81

R82

R83

R84

R85

R86

R87

R88

R90

R91

R92

R93

R94

R95

R96

R97

R98

R99

R101

R102

fxd, met. film 560 W ±1% ¼W

fxd, ww 50 W ±5% 5W

fxd, met. oxide 22 W ±5% 2W

fxd, comp 820

fxd, comp 1K

var. ww 5k W ±10%, Equalizer Adj.

fxd, comp 5.1k W ±5% ½W

±5% ½W

fxd, comp 47

fxd, comp 39

fxd, comp 1k

fxd, met. film 61.9k W ±1% 1/8W

fxd, comp 560

fxd, ww 50 W ±5% 5W

fxd, comp 75 ±5% ½W

±5% ½W

W ±5% ½W

fxd, ww 3.9 W 2W

fxd, ww 400 W ±5% 10W

fxd, met. film 600 W ±1% 1/8W

fxd, met. film 7.5K W ±1% 1/8W

fxd, met. oxide 180 W ±5% 2W

fxd, met. film 499 W ±1% ¼W

fxd, met. film 2k W ±1% ¼W

fxd, comp I00kW ±5% ½W

fxd, comp 200k W ±5% ½W

EB-2045

EB-3335

fxd, comp 33k

±5% ½W

fxd, met. film 5.49k W ±1% 1/8W

fxd, met. film 7.5k W ±1% 1/8W

fxd, met. film 3.4k W ±1% 1/8W

var, ww 5k W ±10%, Ramp Adjust.

fxd, met. film 12k W ±1% 1/8W

fxd, met. film 45k W ±1% 1/8W

Type CEA T-O

Type 110-F4

Type CEA T-O

EB-1235

EB-8235

Type CEA T-O

EB-4345

Type CEA T-O

EB-3925

Type CEA T-O

EB-47G5

EB-9125

EB-2705

EB-1045

EB-9125

Type C42S

EB-1OO5

Type C42S

GB-1815

Type BWH

EB-3925

EB-5115

Type CEA T-O

EB-2045

EB-47G5

EB-1005

EB-2045

Type 110-F4

Type CEA T-O

fxd, comp 12k

fxd, comp 82k

fxd, met. film 4,75k W ±1% 1/8W

fxd, comp 430k

±5% ½W

W ±5% ½W

fxd, met. film 249k W ±1% 1/8W

fxd, comp 3.9k W ±5% ½W

fxd, met. film 4.32k W ±1% 1/8W

fxd, comp 4.7 W ±5% ½W

fxd, comp 9.1k W ±5% ½W

fxd, comp 27

fxd, comp 100k

W ±5% ½W

fxd, comp 9.1k W ±5% ½W

fxd, met. oxide 270 W ±5% 2W

fxd, met. oxide 1.5k W ±5% 2W

fxd, comp 10

W ±5% ½W

fxd, met. oxide 820 W ±5% 2W

fxd, comp 180 W ±5% 1W

fxd, ww 220 W 2W

fxd, comp 3.9k W ±5% ½W

fxd, comp 510

±5% ½W

fxd, met. film 1.5k W ±1% 1/8W

fxd, comp 200k ±5% ½W

fxd, comp 4.7 W ±5% ½W

fxd, comp 10 ±5% ½W

fxd, comp 200k W ±5% ½W

var. ww 250 W ±10%, Ammeter Adj.

fxd, met. film 909 W ±1% 1/8W

6269B

6-6

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TM 11-6625-2958-14&P

REF.

DESIG.

MFR.

CODE

PART NO.

DESCRIPTION

MFR. PART NO.

fxd, met. film 1.5k W ±1% 1/8W

fxd, met. film 19.1k W ±1% 1/8W

fxd, met. film 422 W ±1% ¼W

R103

R104

R105

R106

07716

11236

01121

Type CEA 7-0

Type CEA T-O

Type CEB T-O

Type 110-F4

EB-1015

0757-0427

0698-4484

0698-4590

2100-0439

0686-1015

var. ww 250 W ±10%, Voltmeter Adj.

R108, 109

fxd, comp 100

W ±5% ½W

T70, 90

Pulse Transformer

28480

5080-7122

VR1, 40

VR60, 61

VR90

Diode, zener 4.22V ±5%

Diode, zener 6.2V ±5%

Diode, zener 6.19V ±5%

28480

1902-.3070

1902-1221

1902-0049

Dual Differential Amplifier

Resistor Network

02735

28480

1820-0240

1810-0042

CA3026

A2 RFI FILTER ASSEMBLY

RFI Filter Assembly

28480 06269-60007

fxd, paper .22µF 600Vdc

Triac, 40A 400prv

0160-2461

1884-0080

5080-7146

0698-3629

Type 160P

2N5445

56289

02735

28480

16299

CR1

L1A/L1B

Filter Choke 1.5mH

fxd, met. oxide 270 W ±5% 2W

Type C42S

A3 INTERCONNECTION BOARD

Interconnection Board Assembly

28480

76530

01121

28480

5060-7906

0180-1919

1251-1887

0686-5135

9100-26O7

fxd, elect. 5000µF 45Vdc

P.C. Board Edge Connector

64-718-22

EB-5135

R120

fxd, comp 51k

±5% ½W

Bias Transformer

A4 HEAT SINK ASSEMBLY

Heat Sink Assembly

Fan

28480 06269-60004

97702

3160-0056

WS2107F

fxd, ceramic .05µF 400V

fxd, elect. 15µF 50V

C1-C4

28480

0150-0052

0180-1834

CR101, 102

CR103, 104

CR1O5

CR106

CR108

Rect. Si. 40A 50prv

SCR 35A 4ooprv

1N1183AR

1N1183A

1N1183AR

1N1183A

02577

28480

1901-0316

1901-0315

1901-0316

1901-0315

1901-0316

1884-0058

1N1183AR

CR110

Power PNP Si.

Power NPN Si.

Q101

Q102

Q103-Q108

28480

1853-0063

1854-022S

1854-0458

R106

R123

fxd, ww .125 W ±5% 5W

28480

0811-1846

fxd, cupron 0.01 W 20ppm, Cur-

rent Sampling

28480

5080-7144

R150-R155

Emitter Resistor Assembly

fxd, wire helix O.1 W ±5% - Part of

Emitter Resistor Assembly

28480 06260-60023

28480 0811-2545

6269B

6-7

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T M

1 1 - 6 6 2 5 - 2 9 5 8 - 1 4 & P

MFR.

CODE

PART NO.

REF.

DESCRIPTION

DESIG.

MFR. PART NO.

TS101

Thermal Switch, open 230°F, close

200°F

28480

0440-0079

A5 FRONT PANEL ASSEMBLY

Front Panel Assembly

28480 06269-60005

AM33 Curve 5

74193

2110-0213

CB1

Circuit Breaker, 25A @ 250Vac max.

72765

07137

1450-0048

1450-0305

Indicator Light, Neon, Red

Overvoltage Indicator, 6V, Amber

599-124

MCL-A3-1730

DS1

DS2

1120-1173

1120-1181

28480

Voltmeter, 0-50V

Ammeter, 0-60A

M l

R121

R122

R123

R124

R125

var. ww 10k W ±5%, Voltage

Control, Coarse

var. ww 50 W ±5%, Voltage

Control, Fine

var. ww 200 W ±5%, Current

Control, Coarse

28480

2100-1854

2100-1858

2100-1856

2100-1857

2100-1854

var.

Control, Fine

ww 10 W ±5%, Current

var. ww 10k W ±5%, Overvoltage

Adjustment

CHASSIS - ELECTRICAL

Fan

B 2

23936

3160-0056

8500

fxd, elect. 15µF 50Vdc

fxd, elect. 50,000µF 50Vdc

fxd, ceramic .01µF 300Vdc

150D156X0050R2

0180-1834

0180-2346

0160-2568

C19

C101-C104

C110, 111

56289

28480

56289

41C21A5

Power Transformer

28480 06269-80091

CHASSIS ASSEMBLY- MECHANICAL

Chassis Assembly (Welded)

Bracket, RFI Filter Mounting

Standoff, Insulated, RFI Filter

Mounting

28480

5060-6186

5000-6257

28480

0380-0902

Grommet, 5/8” (Internal

Chassis Divider)

1661

73734

28480

0400-0062

5000-6250

5000-6248

Cover

Chassis, Internal, Ckt. Board Tray

Chassis, Internal, Capacitor Tray

Bus Bar, C101-C102

Bus Bar, C103-C104

Clamp, C101-C104

28480 06269-00002

28480

5000-6251

5000-6253

5000-6017

Bracket, Fan B2

28480 06269-00003

Rear Panel (Blank, with labeling)

Cover, AC Input Barrier Block

Cover, Rear Control Barrier Strip

Bus Bar, Output

Barrier Block, AC Input

Rubber Bumper

28480 06260-60008

28480

28480 00712-20001

5000-6249

28480

75382

87585

5000-6252

0360-1596

0403-0089

603-3

2097-W

Spacer, Insulated, AC Input

Barrier (2), Output Bus Bars (4)

Serial I.D. Plate

28480

0380-0710

7120-1111

6269B

6-8

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TM 11-6625-2958-14&P

MFR.

PART NO.

REF.

DESIG.

DESCRIPTION

MFR. PART NO.

CODE

28480

83330

2190-0491

1510-0044

Shoulder Washer, Bus Bar

Binding Post, 5 Way, N. P. Brass

137

(Ground)

A l - MECHANICAL

28480

71785

0360-1518

0360-1143

Barrier Strip, Rear Control

Jumper, Barrier Strip

422-13-11-013

A2 - MECHANICAL

Heat Sink, RFI Filter Ass’y. (CRl)

Cover, RFI Assembly

Terminal, Insulated, Cl

Wafer, Insulated, CR1

Shoulder Washer, CR1

Hole Plug, Heat Sink, 7/8” dia.

28480

5020-5785

5020-5768

0360-1449

0340-0175

2190-0898

6960-0047

A3-MECHANICAL

Clamp, Capacitor, C3

28480

1400-0472

A4 -MECHANICAL

Heat Sink, Q103-104-107-108,

Q105-106

5020-5763

5020-5769

5020-5766

5020-5765

5000-6256

5000-6255

5020-5787

3050-0455

28480

Heat Sink, CR101-103, CR102-104

Heat Sink, CR106,108,Q102

Heat Sink, CR105, CR110,Q101

Bracket, Mounting, Fan-Heat Sink

Bracket, Mtg. Heat Sink-Chassis

Insulator Strip, Heat Sink Divider

Washers, Nylon, Heat Sink Spacing

Rod, Insulated Spacing, 8-3/4 Lg.,

Threaded 6-32

Rubber Bumper, Heat Sink Protection

Insulator, Mica, Q101-102

Shoulder Washer, Q101-102

Insulator, Transistor Pins, Q101-110

Insulator, Mica, CR109

‘ 06540

28480

08530

28480

8203-PH0632

734

0380-0879

0403-0002

0340-0174

2190-0490

0340-0166

2190-0709

2190-0898

Shoulder Washer, CR109

Shoulder Washer, Heat Sink Bracket

Mounting

28480

3050-0483

AS -MECHANICAL

Front Panel (Blank)

Knob, Front Panel, Black

Fastener, DS1, DS2

Bushing, Potentiometer R125

Nut, Hexagon, R125

Locknut, R121-R124

Bezel, Gray Plastic, 2¼" Mod.

Spring, M1, M2

Handle, 7“

Machine Screw, Fillister Phillips

Head, 10-32x 1-3/4

28480

89032

28480

5000-6254

0370-0137

0510-0123

1410-0052

2950-0034

0590-0013

4040-0296

1460-0256

5020-5762

C17373-012-248

28480

2680-0173

6269B

6-9

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TM 11-6625-2958-14&P

REF.

DESIG.

M R F .

C O D E

H P

PART NO.

MFR. PART NO.

DESCRIPTION

R S

MISCELLANEOUS

Manual

Carton, Packing

Floater Pad, Packing

28480 06269-90002

28480

9211-1181

9220-1402

OPTION 005

50Hz Operation

01121

0686-2415

7124-1719

fxd, comp 240 ±5% ½W

Label, Identification

EB-2415

R82

OPTION 007

10-Turn Voltage Coarse Control

28480

A5R121

A5R123

var. ww 10k W ±5% 10-Turn

2100-1866

2100-1863

1 I

OPTION 008

10-Turn Current Coarse Control

var. ww 200 W ±5% 10-Turn

OPTION 009

10-Turn Voltage & Current Controls

28480

A5R121

A5R123

2100-1866

2100-1863

var. ww 10k W ±5% 10-Turn

var. ww 200 W ±5% 10-Turn

OPTION 010

Chassis Slides

CTS 120 E6

Slides, Chassis

OPTION 013

Decadial Voltage Control

01121

28480

07716

fxd, comp (Selected) ±5% ½W

var. ww 10k W ±5% 10-Turn

Decadial Control

A5R121

Type EB (obd)

RD-411

2100-1866

1140-0020

OPTION 014

Decadial Current Control

01121

28480

07716

R30

A5R123

fxd, comp (Selected) ±5% ½W

var. ww 200 W ±5% 10-Turn

Decadial Control

Type EB (obd)

RD-411

2100-1863

1140-0020

OPTION 020

Voltage Programming Adjust

0757-0473

2100-0806

0757-0270

7124-1721

07716

28480

07716

Type CEA T-O

fxd, met. film 221k W ±1% 1/8W

var. ww 5k W

fxd, met. film 249k W ±1% 1/8W

Label, Identification

R111

R112,113

R114

OPTION 021

Current Programming Adjust

07716

28480

07716

28480

0698-3269

2100-0806

0757-0472

2100-0806

7124-1721

fxd, met. film 23K W ±1% 1\8W

var. ww 5k W

Type CEA T-O

R115

R116

R118

R119

fxd, met. film 200k W ±1% 1/8W

var. ww 5k W

Label, Identification

6269B

6-10

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TM 11-6625-2958-14&P

REF

DESIGN

DESCRIPTION

MFR

CODE

PART NO

MFR PART NO

OPTION 022

VOLTAGE & CURRENT PROGRAMMING ADJUST

R111

R112,113

R114

FXD, MET. FILM 221KW ±1% 1/8W

VAR. WW 5KW

TYPE CEA T-O

07716

28480

07716

0757-0473

2100-0806

0757-0270

FXD, MET. FILM 249KW ±1% 1/8W

R115

R116

R118

R119

FXD, MET. FILM 23KW ±1% 1/8W

VAR. WW 5KW

07716

28480

07716

28480

0698-3269

2100-0806

0757-0472

2100-0806

7124-1721

FXD, MET. FILM 200KW ±1% 1/8W

VAR. WW 5KW

LABEL, IDENTIFICATION

OPTION 027

208VAC INPUT

LABEL, IDENTIFICATION

28480

7124-1717

6269B

6-11

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TM11-6625-2958-14&P

PART

TABLE 6-5. PART NUMBER - NATIONAL STOCK NUMBER

CROSS REFERENCE INDEX

NATIONAL

STOCK

NUMBER

STOCK

PART

NUMBER

FSCM

NUMBER

FSCM

0150-0052

0160-0161

0160-0162

0160-0168

0180-0049

0180-0100

0180-0291

0180-0332

0180-1860

0686-1035

0686-1045

0686-1525

0686-3335

0686-4345

0686-5125

0689-1815

0698-0001

0698-3338

0698-3430

0698-3440

0698-3629

0698-4440

0698-4484

0698-5088

0698-5146

0757-0270

0757-0274

0757-0344

0757-0422

0757-0427

0757-0436

28480

5910-00-797-4909

5910-00-911-9271

5910-00-850-2162

5910-00-917-0668

5910-00-781-9398

5910-00-752-4172

5910-00-931-7055

5910-00-943-6709

5910-00-931-7061

5905-00-451-0540

5905-00-195-6761

5905-00-279-1757

5905-00-997-5436

5905-00-279-2518

5905-00-279-2019

5905-00-403-9066

5905-00-682-4247

5905-00-431-6842

5905-00-420-7136

5905-00-828-0377

5905-00-405-3727

5905-00-431-6840

5905-00-140-5675

5905-00-469-2838

5905-00-431-6837

5905-00-491-4596

5905-00-858-9105

5905-00-269-2629

5905-00-728-9980

5905-00-917-0578

5905-00-858-6792

0757-0437

0757-0440

0757-0460

0757-0472

0757-0473

0757-0739

0757-1100

0813-0001

1N5059

28480

03508

28480

83330

28480

56289

73734

28480

56289

28480

5905-00-904-4404

5905-00-858-6795

5905-00-858-8959

5905-00-257-9210

5905-00-994-8480

5905-00-830-6078

5905-00-917-0586

5905-00-932-0413

5961-00-088-8792

5355-00-584-0840

5935-00-147-7384

5940-00-321-4984

5895-00-061-2906

6210-00-761-8898

5910-00-104-0144

5910-00-177-4300

5325-00-301-8656

5905-00-450-0107

5961-00-931-8259

5961-00-867-9319

5961-00-450-4689

5961-00-137-4608

5961-00-072-0094

5961-00-821-0710

5961-00-931-0213

5961-00-867-9206

5961-00-911-9277

5961-00-931-6989

5910-00-728-8472

5910-00-993-8308

5905-00-851-3924

1140-0020

1251-1887

137

1410-0052

1450-0048

150D105X9035A2

150D475X9035B2

1661

1810-0042

1853-0041

1853-0063

1853-0099

1854-0071

1854-0225

1901-0033

1901-0327

1901-0460

1902-0049

1902-3070

192P10492

192P22392

2100-0439

6-12

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PART NUMBER - NATIONAL STOCK NUMBER

CROSS REFERENCE INDEX

TM 11-6625-2958-14&P

NATIONAL

STOCK

NUMBER

PART

NUMBER

STOCK

PART

NUMBER

FSCM

NUMBER

FSCM

2100-0806

2100-1824

2100-1857

2100-1866

242E1025

28480

56289

28480

56289

28480

71785

72765

08530

5905-00-929-0485

5905-00-892-9626

5905-00-575-8853

5905-00-110-0282

5905-00-504-4892

5905-00-950-5551

5310-00-903-8729

5910-00-081-6159

4140-00-758-6113

5935-00-917-9079

6210-00-761-8898

5970-00-840-5109

243E5005

2950-0034

30D505G050BB2

3160-0056

422-13-11-013

599-124

734

6-13

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TM 11-6625-2958-14&P

SECTION Vll

CIRCUIT DIAGRAMS AND COMPONENT LOCATION DIAGRAMS

b. Preregulator control circuit waveforms

This section contains the circuit diagrams neces-

sary for the operation and maintenance of this

power supply. Included are:

(Figure 7-9), showing the waveforms found at vari-

ous points in the preregulator control circuit.

Component location diagrams (Figures 7-1

Schematic diagram (Figure 7-1 1), illustrat-

through 7-8, and 7-10), showing the physical loca-

tion and reference designators of parts mounted on

the printed circuit boards and chassis.

ing the circuitry for the entire power supply. Volt-

ages are given adjacent to test points, which are

identified by encircled numbers on the schematic.

7-1

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TM 11-6625-2958-14&P

A2 RFI Assembly Component Location Diagram

Figure 7-1.

(Shown removed from supply with assembly cover off.)

Figure 7-2. A3 Interconnection Circuit Board Assembly Component

Location Diagram (Shown with A2 RF I assembly removed.)

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7-2

TM 11-6625-2958-14&P

F i g u r e 7 - 3 .

T o p F r o n t C h a s s i s A s s e m b l y C o m p o n e n t L o c a t i o n D i a g r a m

7-3

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TM 11-6625-2958-14&P

Figure 7-4.

Bottom Front Chassis Assembly Component Location Diagram

7-4

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TM 11-6625-2958-14&P

F i g u r e 7 - 5 . B o t t o m R e a r C h a s s i s A s s e m b l y

C o m p o n e n t L o c a t i o n D i a g r a m

7 - 5

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TM 11-6625-2958-14&P

Figure 7-6.

Assembly Component Location Diagram

(Circuit board is part of A4 heat sink assembly.)

Series Regulator Emitter Resistor

A4 Heat Sink Assembly Component Location Diagram

(Top view, assembly removed from supply.)

Figure 7-7.

7-6

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TM 11-6625-2958-14&P

A4 Heat Sink Assembly Component Location Diagram

(End view, assembly removed from supply.)

Figure 7-8.

NOTES

1. ALL WAVEFORMS TAKEN AT MAXIMUM RATED OUTPUT VOLTAGE, 230 VAC INPUT, NO LOAD CONNECTED AND

CURRENT CONTROLS FULLY CLOCKWISE.

2. SCOPE DC COUPLED AND REFERENCED TO TP103 (INBOARD SIDE OF CURRENT SAMPLING RESISTOR) UNLESS

OTHERWISE SHOWN.

3. FOR CLARITY, WAVEFORMS ARE NOT DRAWN TO SCALE.

Figure 7-9.

Preregulator Control Circuit Waveforms

7-7

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Figure 7-10

This publication does not contain Figure 7-10.

Figure 7-10 does not exist in paper or digital form.

NOT DIGITIZED

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TM 11-6625-2958-14&P

APPENDIX A

REFERENCES

DA Pam 310-4

Index of Technical Manuals, Technical Bulletins,

Supply Manuals (Types 7, 8 and 9), Supply

B u l l e t i n s , and Lubrication Orders.

DA Pam 310-7

TM 38-750

Index of Modification Work Orders.

The Army Maintenance Management System (TAMMS).

Administrative Storage of Equipment.

TM 740-90-1

TM ‘750-244-2

Procedures for Destruction of Electronics Materiel

to Prevent Enemy Use (Electronics Command).

TB 43-180

TB 385-4

Calibration Requirements for the Maintenance of

Army Materiel.

Safety Precautions for Maintenance of Electrical/

Electronic Equipment.

A-1

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TM 11-6625-2958-14&P

APPENDIX B

COMPONENTS OF END ITEM LIST

INTRODUCTION

Section L

(2) Item number. The number used to iden-

tify item called out in the illustration.

B-1. Scope

This appendix lists integral components of and

basic issue items for the PP-7545/U to help

you inventory items required for safe and efficient

operation.

b. National Stock Number. Indicates the Na-

tional stock number assigned to the item and

which will be used for requisitioning.

c. Description. Indicates the Federal item name

and, if required, a minimum description to iden-

tify the item. The part number indicates the pri-

mary number used by the manufacturer, which

controls the design and characteristics of the item

by means of its. engineering drawings, specifica-

tions, standards, and inspection requirements to

identify an item or range of items. Following the

part number, the Federal Supply Code for Manu-

facturers (FSCM) is shown in parentheses

B-2. General

This Components of End Item List is divided into

the following sections:

a. Section II. Integral Components of the End

item. Not applicable. The-se items, when assem-

bled, comprise the PP-754.5/U and must accom-

pany it whenever it is transferred or turned in.

The illustrations will help you identify these items.

b. Section III. Basic Issue Items. Not applicable.

These are the minimum essential items required

to place the PP-7545/U in operation, to operate

it, and to perform emergency repairs. Although

shipped separately packed they must accompany

the PP-7545/U during operation and whenever

it is transferred between accountable officers. The

illustrations will assist you with hard-b-identify

items. This manual is your authority to requisition

replacement BII, base don TOE/MTOE authoriza-

tion of the end item.

d. Location The physical location of each item

listed is given in this column. The lists are de-

signed to inventory all items in one area of the

major item before moving on to an adjacent area.

e. Usable on Code. Not applicable.

f. Quantity Required (Qty Reqd). This column

lists the quantity of each item required for a

complete major item.

B-3. Explanation of Columns

g. Quantity. This column is left blank for use

during an inventory. Under the Rcvd column, list

the quantity you actually receive on your major

item. The Date columns are for your use when you

inventory the major item.

a. Illustration. This column is divided as fol-

lows :

(1) Figure number. Indicates the figure num-

ber of the illustration on which the item is shown.

(Next printed page is B-2.)

B-1

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SECTION II INTEGRAL COMPONENTS OF END ITEM

SECTION III BASIC ISSUE ITEMS

TM 11-6625-2958-14&P

(1)

(2)

(3)

(4)

LOCATION

(5)

(6)

(7)

ILLUSTRATION

NATIONAL

STOCK

NUMBER

DESCRIPTION

USABLE

QTY

QUANTITY

(A)

FIG

(B)

ITEM

REQD

CODE

RCVD DATE

PART NUMBER

(FSCM)

28480

1-1

N/A

6130-00-148-1796

PP-7545/U

TM 11-6625-2958-14&P

B-2

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TM 11-6625-2958-14&P

APPENDIX D

MAINTENANCE ALLOCATION

Section L INTRODUCTION

in precision measurement. Consists of compari-

D-1. General

sons of two instruments, one of which is a certified

standard of known accuracy, to detect and adjust

any discrepancy in the accuracy of the instrument

being compared.

This appendix provides a summary of the main-

tenance operations for the PP-7545/U. It

authorizes categories of maintenance for specific

maintenance functions on repairable items and

components and the tools and equipment required

to perform each function. This appendix may

be used as an aid in planning maintenance opera-

tions.

g. install. The act of emplacing, seating, or fix-

ing into position an item, part, module (compo-

nent or assembly) in a manner to allow the proper

functioning of the equipment or system.

h. Replace. The act of substituting a serviceable

like type part, subassembly, or module (component

or assembly) for an unserviceable counterpart.

D-2. Maintenance Function

Maintenance functions will be limited to and de-

fined as follows:

i. Repair. The application of maintenance serv-

ices (inspect, test, service, adjust, align, calibrate,

replace) or other maintenance actions (welding,

grinding, riveting, straightening, facing, rema-

chining, or resurfacing) to restore serviceability

to an item by correcting, specific damage, fault,

malfunction, or failure in a part, subassembly,

module (component or assembly), end item, or

system.

a. Inspect. To determine the serviceability of an

item by comparing its physical, mechanical, and/

or electrical characteristics with established stand-

ards through examination.

b. Test. To verify serviceability and to detect

incipient failure by measuring the mechanical or

electrical characteristics of an item and compar-

ing those characteristics with prescribed stand-

ards.

j. Overhaul. That maintenance effort (service/

action) necessary to restore an item to a complete-

ly serviceable/operational condition as prescribed

by maintenance standards (i.e., DMWR) in appro-

priate technical publications. Overhaul is normally

the highest degree of maintenance performed by

the Army. Overhaul does not normally return an

item to like new condition.

c. Service. Operations required periodically to

keep an item in proper operating conditions, i.e.,

to clean (decontaminate), to preserve, to drain,

to paint, or to replenish fuel, lubricants, hydraulic

fluids, or compressed air supplies.

d. Adjust To maintain, within prescribed limits,

by bringing into proper or exact position, or by

setting the operating characteristics to the speci-

fied parameters.

k. Rebuild. Consists of those services actions

necessary for the restoration of unserviceable

equipment to a like new condition in accordance

with original manufacturing standards. Rebuild

is the highest degree of materiel maintenance

applied to Army equipment. The rebuild operation

includes the act of returning to zero those age

measurements (hours, miles, etc. ) considered in

classifying Army equipments/components.

e. Align To adjust specified variable elements

of an item to bring about optimum or desired

performance.

f. Calibrate. To determine and cause corrections

to be made or to be adjusted on instruments or

test measuring and diagnostic equipments used

D-1

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TM 11-6625-2958-14&P

D-3. Column Entries

e. Column 5, Tools and Equipment. Column 5

specifies by code, those common tool sets (not

individual tools) and special tools, test, and sup-

port equipment required to perform the designated

function.

u. Column 1, Group Number. Column 1 lists

group numbers, the purpose of which is to identify

components, assemblies, subassemblies, and mod-

ules with the next higher assembly.

b. Column 2, Component/Assembly. Column 2

contains the noun names of components, assem-

blies, subassemblies, and modules for which main-

tenance is authorized.

f. Column 6, Remarks. Column 6 contains an

alphabetic code which leads to the remark in

section IV, Remarks, which is pertinent to the

item opposite the particular code.

c. Column 3, Maintenance Functions. Column 3

lists the functions to be performed on the item

listed in column 2. When items are listed without

maintenance functions, it is solely for purpose

of having the group numbers in the MAC and

RPSTL coincide.

D-4. Tool and Test Equipment Requirement

(sect Ill)

a. Tool or Test Equipment Reference Code. The

numbers in this column coincide with the numbers

used in the tools and equipment column of the

MAC. The numbers indicate the applicable tool

or test equipment for the maintenance functions.

d. Column 4, Maintenance Category. Column 4

specifies, by the listing of a “worktime” figure in

the appropriate subcolumn (s), the lowest level of

maintenance authorized to perform the function

listed in column 3. This figure represents the ac-

tive time required to perform that maintenance

function at the indicated category of maintenance.

If the number or complexity of the tasks within

the listed maintenance function vary at different

maintenance categories, appropriate “worktime”

figures will be shown for each category. The num-

ber of task-hours specified by the “worktime”

figure represents the average time required to

restore an item (assembly, subassembly, compo-

nent, module, end item or system) to a serviceable

condition under typical field operating conditions.

This time includes preparation time, troubleshoot-

ing time, and quality assurance/quality control

time in addition to the time required to perform

the specific tasks identified for the maintenance

functions authorized in the maintenance allocation

chart. Subcolumns of column 4 are as follows:

b. Maintenance Category. The codes in this

column indicate the maintenance category allo-

cated the tool or test equipment.

c. Nomenclature. This column lists the noun

name and nomenclature of the tools and test

equipment required to perform the maintenance

functions.

d. National/NATO Stock Number. This column

lists the National, NATO stock number of the

specified tool or test equipment.

e. Tool Number. This column lists the manu-

facturer’s part number of the tool followed by the

Federal Supply Code for manufacturers (5-digit)

in parentheses.

D-5. Remarks (sect IV)

a. Reference Code. This code refers to the ap-

propriate item in section II, column 6.

C - Operator/Crew

0- Organizational

F - Direct Support

H - General Support

D - Depot

b. Remarks. This column provides the required

explanatory information necessary to clarify items

appearing in section II.

D-2

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SECTION II MAINTENANCE ALLOCATION CHART

TM 11-6625-2958-14&P

D - 3

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TM11-6625-2958-14&P

TOOL OR TEST

SECTION III TOOL AND TEST EQUIPMENT REQUIREMENTS

FOR

POWER SUPPLY PP-7545/U

EQUIPMENT

REF CODE

MAINTENANCE

NOMENCLATURE

NATIONAL/NATO

STOCK NUMBER

TOOL NUMBER