HP (Hewlett-Packard) 6269b User Manual

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TM 11-6625-2958-14&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

SAFETY STEPS TO FOLLOW IF SOMEONE

IS THE VICTIM OF ELECTRICAL SHOCK

DO NOT TRY TO PULL OR GRAB THE INDIVIDUAL

IF POSSIBLE , TURN OFF THE ELECTRICAL POWER

IF YOU CANNOT TURN OFF THE ELECTRICAL POWER, PULL, PUSH, OR LIFT THE PERSON TO

SAFETY USING A WOODEN POLE OR A ROPE OR

SOME OTHER INSULATING MATERIAL

SEND FOR HELP AS SOON AS POSSIBLE

AFTER THE INJURED PERSON IS FREE OF

CONTACT

WITH THE SOURCE OF ELECTRICAL

SHOCK, MOVE THE PERSON A SHORT DISTANCE AWAY AND IMMEDIATELY START ARTIFICIAL

RESUSCITATION

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

TM 11-6625-2958-14&P

TECHNICAL MANUAL No. 11-6625-2958-14&P

DEPARTMENT OF THE ARMY

Washington DC, 21 August 1980

HEADQUARTERS

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 sample, 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.

TABLE OF CONTENTS

Section

INSTRUCTIONS

0-1 Scope 0-2 Indexes of Publications

0-3 Forms and Records 0-4 Reporting Equipment Im-

provement Recommendations (EIR) 0-1

0-5 Administrative Storage 0-6 Destruction of Army

Electronics Materiel 0-1

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

1-1 Description 1-7 Specifications 1-9 Options 1-11 Instrument/Manual

Identification

1-14 Ordering Additional Manuals 1-3

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

2-1

Initial Inspection

2-3

Mechanical Check

2-5

Electrical Check

2-7

Installation Data

2-9

Location

2-11

Outline Diagram

2-13

Rack Mounting

2-15

Input Power Requirements

2-17

Connections for 208 Volt

Operation (Model 6259B, 6261B, or 6268B)

2-19

Connections for 208 Volt

Operation (Model 6260B and 6269B)

2-21

Connections for 115 Volt

Operation (Model 6259B,

6261B, and 6268B)

2-23

Connections for 115 Volt

Operation (Model 6260B)

2-25

Connections for 50Hz

Operation

2-27

Power Cable

2-29

Repackaging for Shipment

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

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

Page No.

6-1 0-1

0-1

1-1 1-2 1-2

1-2

2-1 2-1

2-1 2-1 2-1 2-1 2-1 2-1

2-1

2-2

2-3 2-3 2-4

2-4 2-4

3-1

3-1 3-2 3-2

3-2 3-2 3-2

3-3

iii

Section

3-22

Optional Operating Modes

3-23

Remote Programming,

3-32

3-41 3-46 3-50 3-55 3-59

3-60

3-62 3-65

3-67

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

4-1

4-16 4-17 4-27 4-29 4-31

4-38 4-43 4-46 4-50

4-56

4-59 4-64 4-68

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

5-1 5-3 5-5

5-7 5-40 5-51

5-56 5-62

5-71 5-73 5-75

5-77 5-79

5-81 5-90 .5-99

5-101 Ripple Imbalance 150 and

Constant Voltage

Remote Programming,

Constant Current

Remote Sensing Auto-Parallel Operation Auto-Series Operation

Auto-Tracking Operation

Special Operating

Considerations

Pulse Loading

Output Capacitance

Reverse Voltage Loading Reverse Current Loading

Overall BIock Diagram

Discussion 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

Turn-On Control Circuit Reference Regulator Meter Circuit

Additional Protection Features

Introduction

Test Equipment Required

performance Test 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

Programming Current

Transient Recovery Time

60Hz Operation)

Page No.

3-3 3-3

3-4 3-5 3-6 3-7

3-8 3-8

3-8

3-9 3-9

3-9

4-1 4-3 4-3

4-4 4-4 4-5

4-5 4-6 4-6

4-6 4-7

4-7 4-7 4-8

5-l 5-1

5-2 5-2 5-7 5-9

5-10

5-15 5-16 5-18 5-18 5-18

5-18 5-19

5-20 5-20

5-20

Section

V MAINTANCE . . Continued

5-103 Preregulator Tracking (5 O and

60Hz Operation) 5-105 50Hz Operation (Option 005) 5-21 5-107 Crowbar Trip Voltage 5-109 Maximum Crowbar

Trip Voltage

TABLE OF CONTENTS (Continued)

Page No.

5-21 VI REPLACEABLE PARTS . . . . . . . . . . . ...6-1

5-21 6-4 Ordering Information 5-22 VII CIRCUIT DIAGRAMS & COMPONENT

Section

5-111 Crowbar Disablement

6-1 Introduction

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

Page No.

5-22

6-1 6-1

APPENDIX

Section

APPENDIX

Section

Table

1-1 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

II.

III. c. D.

II.

111. Iv.

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

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

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

Preregulator Troubleshooting

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

Reference Designators. . .

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

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

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

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

References Components of End Item List

Introduction

Integral Components of End Item Basic Issue Items Additional Authorization List (N/A) Maintenance Allocation Chart

Introduction Maintenance Allocation Chart Tools and Test Equipment Required

Remarks

LIST OF TABLES

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

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

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

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

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

Page No.

A-1

D-1 D-1

D-3

D-4 D-5

Page No

1-3 5-1 5-10 5-10 5-12

5-14 6-1 6-2

6-5

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.

LIST OF ILLUSTRATIONS

Figure

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

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 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

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

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

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

3-12 Auto-Tracking, Two and Three Units

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

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

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

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

7-9 Preregulator Control Circuit Waveforms

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

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

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

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

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

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

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

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

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

Page No.

2-1

3-1

3-5

3-8 4-2 4-4

5-2 5-3 5-4

7-7

Foldout

SECTION O

INTRODUCTION

TM 11-6625-2958-14&P

0-1. SCOPE.

a. This manual describes DC Power

Supply PP-7545/U (fig. l-l) and

provides maintenance instructions. Throughout this manual, PP-7545/U is referred to as the Hewlett-Pack-

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. ard (HP) Model 6269B DC Power supply.

0-4. REPORTING EQUIPMENT

IMPROVEMENT

RECOMMENDATIONS (EIR).

0-2. INDEXES OF PUBLICATIONS.

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.

a. Reports of Maintenance and Unsatisfactory Equipment. Maintenance forms, records, and reports which are to be used by maintenance per-

EIR’s will be prepared using SF 368 (Quality Deficiency Report). Instructions for preparing EIR’s are provided in TM 38-750, the Army Maintenance 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. 0-5. ADMINISTRATIVE STORAGE.

Administrative storage of equipment issued to and used by Army activities shall be in accordance with

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

sonnel at all maintenance levels are listed in and

SCribed by TM 38-750.

pre

b. Report of Packaging and Handling Deficienties. FiII out and forward DD Form 6 (Packaging Improvement Report) as prescribed in AR 735-11

-2/NAVUPINST4440.127E/AFR 400-54/MCO

0-6. DESTRUCTION OF ARMY

ELECTRONICS MATERIEL.

Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM 750-244-2.

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 exposed connections or compments. MAKE CERTAIN you are not grounded when making connections or adjusting components 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

SECTION I

GENERAL INFORMATION

TM 11-6625-2958-14&P

Figure 1-1.

1-1 DESCRIPTION

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 output current or can be continuously adjusted throughout the output range. The front panel CURRENT controls 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 current 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.

1-3 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.

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

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.

1-5 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 supply. 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 external voltage source or resistarice.

b. Remote-Sensing. The degradation in regulation which occurs at the load due to voltage drop in the load leads can be reduced by using the power supply in the remote sensing mode of operation.

c. Auto-Series Operation. Power supplies

1-1

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. AutoSeries 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.

1-7 SPECIFICATIONS

1-8 Detailed specifications for the power supply

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

1-9 OPTIONS

1-10 Options are customer-requested factory modifications of a standard instrument. options are available for the instrument covered by this manual. Where necessary, detailed coverage of the options is included throughout the manual.

Option No.

005

007

008

009

010

013

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 preregulator tracking.

Ten-Turn Output Voltage Control:

A single control that replaces the

coarse voltage control and allows

greater resolution in setting the out-

put voltage.

Ten-Turn Output Current Control:

A single control that replaces the

coarse current control and allows greater resolution in setting the output current.

Ten-Turn Output Voltage and Current Controls: Options 007 and 008 on the same instrument.

Chassis Slides: Enables convenient access to power supply interior for maintenance purposes.

Three Digit Graduated Decadial Voltage Control: A single control that replaces the coarse voltage control and allows accurate resetting of the output voltage.

Description

The following

Option No.

014

020

021

022

027

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 number; to each power supply, starting with 00101.

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 differences between your instrument and the instrument described by this manual.

a different sequential number is assigned

Three Digit Graduated Decadial Current Control: 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, screwdriveradjustable controls that allow accu-

rately setting the zero volt output and the constant voltage programming coefficient.

Current Programming Adjustment:

Two rear panel mounted, screwdriveradjustable controls that allow accurately setting the zero current output and the constant current programming coefficient.

Voltage and Current Programming

Adjustments: Options 020 and 021 on the same instrument.

Rewire for 115Vac Input (6259B,

6261B, and 6268B only): Consists of replacing the line circuit breaker, and reconnecting the input power transformer, bias transformer, RF I choke, and fans for 115Vac operation.

Rewire for 208Vac Input: Consists of reconnecting the input power transformer and bias transformer for 208V ac operation.

Description

A single control that

1-2

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

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.

INPUT:

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

2500W @ 230V.

OUTPUT :

0-40 volts @ 0-50 amperes.

LOAD REGULATION:

Constant Voltage - Less than 0.01% plus 200µV for a load current change equal to the current rating of the supply.

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.

RIPPLE AND NOISE:

Constant Voltage - Less than 1mV rms, 5mV P-P (dc to 20MHz).

Constant Current - Less than 25mA rms. TEMPERATURE RATINGS:

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

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.

STABILITY :

Constant Voltage - Less than O .03% plus 2mV total drift for 8 hours following 30 minutes warmup under constant ambient conditions.

Constant Current- Less than 0.03% plus 10mA total drift for 8 hours following 30 minutes warmup under constant ambient conditions.

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.

METERS:

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

(0-60A) is provided.

scale. )

OUTPUT CONTROLS:

Single-turn coarse and fine voltage and current

controls are included on the front panel.

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.

REMOTE VOLTAGE PROGRAMMING:

All programming terminals are on a rear barrier strip.

Constant Voltage -

Constant Current REMOTE RESISTANCE PROGRAMMING:

All programming terminals are on a rear

barrier strip.

Constant Voltage -200 ohms/volt (Accuracy:

1%).

Constant Current -4 ohms/ampere (Accuracy

10%).

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.

COOLING:

Forced air cooling is employed. The supply has

two cooling fans.

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. FINISH:

Light gray front panel with dark gray case.

(Accurate within 2% of full

1V/volt (accuracy: 1%). 10mV/amp (Accuracy 10%).

1-3

SECTION II

INSTALLATION

2-1 INITIAL INSPECTION

2-2 Before shipment, this instrument was inspected and found to be free of mechanical and electrical defects. As soon as the instrument is unpacked, inspect for any damage that may have occurred in transit. Save all packing materials until the inspection is completed. If damage is found, file a claim with the carrier immediately. HewlettPackard Sales and Service office should be notified.

TM 11-6625-2958-14&P

2-3 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.

2-6 The instrument should be checked against its electrical specifications. Section V includes a n “in-cabinet” performance check to verify proper instrument operation.

operation. It is necessary only to connect the inoperation.

2-10 This instrument is fan cooled. Sufficient 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-

2-12 Figure 2-1 illustrates the outline shape and dimensions of Models 6259B, 6260B, 6261B, 6268B, and 6269B.

easily rack mounted in a conventional 19 inch rack

MECHANICAL CHECK

2-5 ELECTRICAL CHECK

2-7 INSTALLATION DATA

2-8 The instrument is shipped ready for bench strument to a source of power and it is ready for

2-9

LOCATION

space should be allotted so that a free flow of

ceed 55°C. 2-11 OUTLINE DIAGRAM

2-13 RACK MOUNTING 2-14 This instrument is full rack size and can be panel using standard mounting screws,

Figure 2-1.

2-15 INPUT POWER REQUIREMENTS

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 power source. 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 operated from a 230 volt power source at full load is:

Model 6259B 6260B 6261B 6268B 6269B

2-17 CONNECTIONS FOR 208 VOLT OPERATION

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

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.)

Model 6269B may be operated from

Input Current

Outline Diagram

6A 12A 11A 11A 18A

Input Power

850W 1600W 1500W 1600W

2500W

2-1

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).

Figure 2-2. Bias Transformer Primary Connections for 208Vac Operation (Model 6259B, 6260B, 6261B,

6268B, and 6269B) and 115Vac Operation

(Except Model 6269B)

b. Unsolder wire from circuit breaker A5CB1 connected to "230V" terminal of bias transformer A3T2 and solder it instead to "208V" terminal of

Figure 2-3.

Connections for 208Vac and 115Vac Operation

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

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 connected to to "230V” terminal

2-2

Power Transformer Primary

TM 11-6625-2958-14&P

Figure 2-4.

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).

2-21 CONNECTIONS FOR 115 VOLT OPERATION

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

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.

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.

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

Power Transformer T 1 Primary

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

Connections for 115Vac Operation

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

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).

2-23 CONNECTIONS FOR 115 VOLT OPERATION

(Model 6260B: Option 016)

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 transformer 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.

2-3

TM 11-6625-2958-14&P

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

2-22.

2-25 CONNECTIONS FOR 50Hz OPERATION

2-26 For operation from a 50Hz ac input, R82 must be replaced with a 240 as specified under Option 005 in Table 6-4 (Replaceable Parts). readjust the voltage drop across the series regulator (“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 instrument. It is recommended that the user-supplied power cable have three conductors (third conductor

In addition, it is necessary to

Ω, ±5%, ½ watt resistor

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.

2-29 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 material 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 instrument 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.

2-4

SECTION Ill

OPERATING INSTRUCTIONS

TM 11-6625-2958-14&P

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

3-1 TURN-ON CHECKOUT PROCEDURE

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.

b. Adjust VOLTAGE controls ③ until desired

voltage is indicated on voltmeter ④ .

c. To ensure that overvoltage crowbar circuit is operational, rotate OVERVOLTAGE ADJUST control ⑤ (screwdriver adjust) counterclockwise

until unit crowbars. 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).

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.

Overvoltage lamp ⑥ will

3-3 OPERATING MODES

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 terminal strip at the rear of the power supply. The terminal 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 concerning 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 addresses appear at the rear of the manual.

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 controls (local programming; no strapping changes are necessary).

3-1

TM 11-6625-2958-14&P

Figure 3-2. Normal Strapping Pattern

Clockwise rotation of the control produces higher trip voltages. The factory sets the control fully clockwise. The crowbar may be disabled completely 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 output 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. 3-7 CONSTANT VOLTAGE 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 terminals open.

b. Short circuit output terminals and adjust CURRENT controls for maximum output current allowable (current limit), as determined by load conditions. If a load change causes the current limit to be exceeded, the power supply will automatically cross over to constant current output at the preset current limit and the output voltage will drop proportionately. In setting the current Iimit, allowance must be made for high peak currents which 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 exceeded, 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.)

3-14 CONNECTING LOAD 3-15 Each load should be connected to the power

supply output terminals using separate pairs of connecting wires. This will minimize mutual coupling effects between loads and will retain full advantage 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 output 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.)

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, regardless of where the setup is grounded. This will eliminate any possibility of output current return paths through the power source ground which would damage the line cord plug. This supply can also be operated up to 300Vdc above ground, if neither output terminal is grounded.

3-18 NO LOAD OPERATION

3-11 OVERVOLTAGE TRIP POINT ADJUSTMENT 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:

6259B, 6260B

2 to 12Vdc

When the crowbar trips, the output is shorted and

the amber indicator on the front panel lights.

6261B 6268B, 6269B

2 to 23Vdc

4 to 45Vdc

3-19 When the supply is operated without a load, down-programming speed is considerably slower

than in normal loaded operation. This slower programming 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,

3-2

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.

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.

3-22 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 remote 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.

3-26 The output voltage of the supply should be

TM 11-6625-2958-14&P

-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 discussed in Paragraph 5-83, or, if the instrument is equipped with Option 020, by adjusting potentiome-

ter R113 as discussed in Paragraph 5-85.

3-27 To maintain the stability and temperature coefficient of the power supply, use programming resistors that have stable, low noise, and low temperature 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 during the switching interval.

3-25 Resistance Programming

(Figure 3-3). In this mode, the output voltage will vary at a rate determined 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.

Figure 3-4.

Remet e Voltage Programming,

Unity Gain (Constant Voltage)

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

) 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

R should have sta-

ble, low noise, and low temperature coefficient

3-3

TM 11-6625-2958-14&P

Figure 3-5. Remote Voltage Programming,

Non-Unity Gain (Constant Voltage)

(less than 30ppm Per degree Centigrade) character-

istics in order to maintain the Supply's temperature and stability specifications. Reference resistor 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 terminals Al and A2 together.

3-31 The output voltage of the supply may be adjusted to exactly zero when the external programming voltage is zero by either inserting and adjusting R111 as discussed in Paragraph 5-84, or, if the

instrument is equipped with Option 020, by adjusting potentiometer R112 as discussed in Paragraph

5-86.

Figure 3-6. Remote Resistance Programming

(Constant Current)

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.

3-35 Use stable, low noise, low temperature coefficient (less than 30ppm/°C) programming resistors to maintain the power supply temperature coefficient 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.

3-32 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. 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 adjusted 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

CAUTION

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 programming terminals.

3-4

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 current 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

R and programming voltage source E

should be such that the value of ES/RR is equal to or greater than 2.5mA.

Figure 3-7.

Remote Voltage Programming,

Unity Gain (Constant Current]

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. 3-37 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

10.0mV/ampere

16.7mV/ampere

10.0mV/ampere The current required from the voltage source will be less than 20µA. Impedance matching resistor R

required to maintain the temperature coefficient and

stability specifications of the supply. 3-38 Voltage Programming,

Non-Unity Gain (Figure

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

3-39 External resistors Rp and R

R should have sta-

ble, low noise, and low temperature coefficient

(less than 30ppm per degree Centigrade) characteristics in order to maintain the stability and temperature specifications of the Power supply. Reference resistor R

R should not exceed 10K. Note that it is

possible to use the front panel current control already in the supply (A5R123) as the gain

control (Rp) by simply removing the external Rp and strapping terminals AS and A6 together.

3-40 The output current of the supply may be adjusted to exactly zero when the external programming voltage is zero by either inserting and adjusting 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.

3-41 REMOTE SENSING (Figure 3-9)

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.

Figure 3-8.

Remote Voltage Programming,

Non-Unity Gain (Constant Current)

3-5

Figure 3-9.

Remote Sensing

TM 11-6625-2958-14&P 3-43 For reasonable load lead lengths, remote

sensing greatly improves the performance of the

supply. However, if the load is located a considerable distance from the supply, added precautions must be observed to obtain satisfactory operation. Notice that the voltage drop in the load leads subtracts directly from the available output voltage and also reduces the amplitude of the feedback error signals that are deveIoped within the unit. Because 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.

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 similar characteristics (approximately the same capacitance, the same voltage rating or greater, and having good high frequency characteristics) directly across load using short leads. Readjust equalization 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.

from the -S terminal to the negative side of the load. Note that there may be more than one lead connected to the +S and -S terminals.

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

3-45 To employ remote sensing with any method of remote programming or with any method of combining 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

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. Remote 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 potentiometer on the slave supply should be set to maximum [clockwise) so that the master crowbar will control the slave.

TM 11-6625-2958-14&P

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 connection is used, the output voltage of each slave supply 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 arrangements shown in Figure 3-11 show local sensing

and programming.

3-52 In order to maintain the temperature coeffi-

Figure 3-11.

Auto-Series Operation,

Two and Three Units

cient and stability specifications of the power supply, the external resistors (Rx) shown in Figure 3-11 should be stable, low noise, low temperature coefficient (less than 30ppm per degree Centigrade) resistors.

The value of each resistor is dependent

3-7

TM 11-6625-2958-14&P on the maximum voltage rating of the "master" sup-

ply. The value of R

is this voltage divided by the

voltage programming current of the slave supply

(1/Kp where K

P is 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 AutoSeries operation by connecting the crowbars in parallel with correct polarity as in Auto-Parallel operation (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 output voltage that the supply will contribute.

3-54 When the center tap of an Auto-Series combination 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 percentage of the master's output voltage (EM), and is determined by the voltage divider consisting of R

and the voltage control of the slave supply, Rp,

where E

S = EM [Rp/(R

+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 coefficient and stability specifications of the power supply, the external resistors should be stable, low

noise, low temperature coefficient (less than 30ppm per degree Centigrade) resistors.

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

Figure 3-12. Auto-Tracking, Tw

O and Three Units

each slave will also decrease. However, the reverse is not true. If one of the slave units crowbars, the other supplies in *the ensemble will not be affected.

3-59 SPECIAL OPERATING CONSIDERATIONS

3-60 “PULSE LOADING

3-61 The power supply

will automatically cross

3-8

over from constant voltage to constant current operation, or the reverse, in response to an increase

(over the preset limit) in the output current or voltage, 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 limiting is not desired, set the preset limit for the peak

requirement and not the average.

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.

3-64 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.

TM 11-6625-2958-14&P

c. A large surge current causing a high pow-

er dissipation in the load occurs when the load re-

sistance is reduced rapidly.

3-65 REVERSE VOLTAGE LOADING

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

output terminals. Under normal operation conditions, the diode is reverse biased (anode connected 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.

3-67 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 possible 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.

3-9

SECTION IV

PRINCIPLES OF OPERATION

TM 11-6625-2958-14&P

Figure 4-1. Overall Block Diagram

4-1 OVERALL BLOCK DIAGRAM DISCUSSION

4-2 The major circuits of the power supply are

shown on the overall block diagram of Figure 4-1. The ac input voltage is first applied to the preregulator triac which operates in conjunction with the preregulator control circuit to form a feedback loop.

This feedback loop minimizes the power dissipated

by the series regulator by keeping the voltage drop across the regulator at a low and constant level.

4-3 To accomplish this, the preregulator control circuit issues a phase adjusted firing pulse to the

triac once during each half cycle of the input ac.

The control circuit continuously samples the output voltage, the input line voltage (from A3T2), and the voltage across the series regulator and, on the

basis of these inputs, determines at what time each firing pulse is generated.

4-4 The phase adjusted output of the triac is ap-

plied to the power transformer where it is steppeddown and coupled to a full-wave rectifier and filter. The preregulated dc current is applied next to the

series reguIator which varies its conduction to provide a regulated voltage or current at the output terminals.

4-5 The series regulator is part of another feedback loop consisting of the error and driver amplifiers and the constant voltage/constant current

compactors. The series regulator feedback loop provides rapid, low magnitude regulation of the output while the preregulator feedback loop handles

large, relatively slow, regulation demands.

4-1

TM 11-6625-2958-14&P

4-6 The feedback signals controlling the conduction of the series regulator originate within the

constant voltage or constant current comparator. During constant voltage operation the constant voltage comparator continuously compares the output 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 constant current comparator detects any difference be-

tween the voltage drop developed by the load current 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 resistor, and therefore the output current, is main-

tained at a constant value. 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.

4-9 Figure 4-2 shows the output characteristic of a constant voltage/constant current power supply.

With no load attached (RL =

OUT = Es, the front panel voltage control setting.

∞), IOUT = O, and

When a load resistance is applied to the output terminals of the power supply, the output current

increases, while the output voltage remains constant; point D thus represents a typical constant voltage operating point. Further decreases in load

resistance are accompanied by further increases in

OUT with no change in the output voltage until the

I output current reaches Is, a value equal to the front panel current control setting. At this point the supply automatically changes its mode of operation and becomes a constant current source; still further decreases in the value of load resistance are accompanied by a drop in the supply output voltage with no accompanying change in the output current

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

Power Supply

value. With a short circuit across the output load

terminals, I 4-10 The ‘

be defined as R

OUT = ES and EOUT = O.

Crossover” value of load resistance can

C = Es/Is. Adjustment of the front

panel voltage and current controls permits this “crossover” resistance R value from 0 to

∞. If RL is greater than RC, the

C to be set to any desired

supply is in constant voltage operation, while if R is less than RC, the supply is in constant current operation.

4-11 The short circuit protection circuit (see Figure 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 protection circuit is turned off and has no effect on normal operation of the supply.

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 circuits the supply.

The circuit also sends a turn-

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

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” value 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 turnon, 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 voltages are obtained from the bias supply.

4-16 DETAILED CIRCUIT ANALYSIS (See

Figure 7-11)

TM 11-6625-2958-14&P

Figure 4-3. Triac Phase Control Over

AC Input Amplitude

4-17 PREREGULATOR CONTROL CIRCUIT

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.

4-19 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 milliseconds) 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 transformer is relatively high. When the triac is fired later during the half-cycle, the ac level is relatively low.

4-20 Normally the ac input signal must be at a certain minimum potential before the triac will conduct. 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

box (assembly A2) to minimize radiated and reflected RFI. Further RFI suppression is provided by by-

pass capacitors C110 and C111.

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 desired level.

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-

4-3

TM 11-6625-2958-14&P

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, diodes 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 configuration. 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 collector of Q72.

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

waveform (C) of Figure 4-4, the firing pulse is quite narrow because Q73 saturates rapidly, causing the magnetic field surrounding T70 to collapse. Diode CR76 damps out positive overshoot.

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 transformer at T70 at reset time.

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 output. 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 temperatures 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.

Figure 4-4. Preregulator Control Circuit Waveforms

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

supply’s rating. short circuit is imposed, the preregulator shuts off.

4-4

Within 10 milliseconds after the

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.

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 amplifier to minimize differential voltages due to mismatched transistors and thermal differentials.

4-33 The constant voltage comparator continuously

compares the voltage drop across the VOLTAGE controls 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.

during rapid down-programming; diodes CR5 and

TM 11-6625-2958-14&P

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 controls. Resistor R2 limits the discharge current

through C2. Resistors Z2F, Z2M, and Z2N bias the differential amplifier; diode CR4 provides temperature 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 current to be adjusted by varying the bias applied to the summing point.

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 potentiometer 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 difference voltage between the two inputs of the differential amplifier. This difference voltage is amplified and appears at the output of the differential amplifier (pin 12) as an error voltage which ultimately varies the conduction of the series regulator.

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

input to the differential amplifier, limits the current through the programming resistors during rapid

voltage turn-down. Diode CR7 prevents excessive

current drain from the +6.2 volt reference supply

4-38 CONSTANT CURRENT COMPARATOR

4-39 This circuit is similar in appearance and operation 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.

4-41 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

TM 11-6625-2958-14&P

and optional resistor R 117. The other input of the differential amplifier (pin 4) is connected to a summing point (terminal A6) at the junction of the programming 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 summing 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 voltage which ultimately varies the conduction of the s cries regulator.

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 operation.

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 potentiometer 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.

4-43 VOLTAGE CLAMP CIRCUIT

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 supply. 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.

4-45 The voltage divider, Z2A, Z2B, and VR1, back biases CR2 and Q1 during constant voltage operat 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 conduction 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.

4-48 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. 4-49 Error amplifiers Q42 and A4Q101 serve as the

predriver elements for the series regulator. In addition, transistor A4Q101 allows faster down-programming 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-

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).

4-50 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.

4-52 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

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.

4-53 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.

4-54 The crowbar circuit creates an extra current path during normal operation of the supply, thus

changing the current that flows through the sampling 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 crowbars 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.

4-56 TURN-ON CONTROL CIRCUIT

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 voltage 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.

TM 11-6625-2958-14&P 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.

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 obtained 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 establish 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.

4-61 The regulating circuit consists of s cries regulating 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 correct phase and amplitude to maintain the +12.4 volt output at a constant level.

4-62 Diode CR60, connected from voltage divider R66 and R67 to the base of Q61, serves as a turnon 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.

4-63 Unregulated 11Vdc is supplied from a separate winding on transformer A3T2 by diodes CR53 and CR54 and filter capacitor C44. Additional lightly 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.

4-58 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

TM 11-6625-2958-14&P tions of output voltage and current on the dc voltmeter and ammeter. Both meter movements can withstand an overload of many times the maximum rated output without damage.

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.

Potenti-

ometer R101 is adjusted for full scale deflection

(calibration) of the ammeter.

4-67 The voltmeter, in series with R103 and R104 and shunted by R102 and R106, is connected directly across the output terminals of the supply. Poten-

tiometer R106 permits calibration of the voltmeter.

4-68 ADDITIONAL PROTECTION FEATURES 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 internal damage from reverse voltages that might be applied across the supply. This could occur, fo

example, during Auto-Series operation if one supply was turned on before the other.

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 inadvertently removed.

4-71 Diode A4CR105, previously mentioned in the series regulator description, protects the regula-

ting transistor from the effects of reverse voltages.

4-8

SECTION V

MAINTENANCE

TM 11-6625-2958-14&P

5-1 INTRODUCTION

5-2 Upon receipt of the power supply, the performance check (Paragraph 5-5) should be made. This check is suitable for incoming inspection. If a fault is detected in the power supply while making 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 section.

Table 5-1. Test Equipment Required

TYPE

Differential

Voltmeter

Oscilloscope Sensitivity and bandwidth;

Sensitivity: 1mV full scale (min.) Input impedance: 10M

100µV/cm and 400KHz for all

measurements except noise spike;

5mV sensitivity and 20 MHz bandwidth for noise spike measurement.

REQUIRED

CHARACTERISTICS

Ω (rein.)

returning the power supply to normal operation, repeat 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.

5-3 TEST EQUIPMENT REQUIRED

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

perform the various procedures described in this

Measure dc voltages; calibration procedures.

Measure ripple; display

transient recovery wave-

form; measure noise spikes.

USE

RECOMMENDED

MODEL

3420A/B (See

Note on Page 5-2)

140A with 1423A

time base and

1400A vertical plug-in; 1402A plug-in for spike measurement.

Variable

Voltage

Transformer

AC Voltmeter

DC Voltmeter

Repetitive

Load Stitch Rise time: 2µsec.

Resistive

Loads

Current

Sampling

Resistors

Range: 207-253Vac. Recommended minimum output current: 12A, 6259B; 22A, 6261B and 6268B; 24A, 6260B: 36A, 6269B.

Sensitivity: 1mV full scale deflection (min). Accuracy: 2%. ripple.

Sensitivity: 1mV full scale de- Measure dc voltages. flection (rein). Accuracy: 1%.

Switching rate: 60-400Hz

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

Values: see Figure 5-8. Measure output current;

Vary ac input for line

regulation measurement.

Measure ac voltages and

Measure transient re- See Figure 5-5. covery time.

Power supply load

resistors.

A4R123;: A4R123A-

calibrate ammeter.

A4R123B,

6260B only; see Replaceable Parts

Table.

----

403B

412A

----

5-1

TM 11-6625-2958-14&P

Table 5-1.

Test Equipment Required (Continued)

TYPE

REQUIRED

CHARACTERISTICS

USE

Terminating Value: 50 ohms, ½ watt, ±5%, Noise spike measure-

Resistors

Blocking

Capacitors

non-inductive. (Four required.) Value: 0.01µF, 100Vdc. (Two Noise spike measure-

required.) ment.

NOTE

A satisfactory substitute for a differential 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

ment.

5-5 PERFORMANCE TEST

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 maintenance tests.

The tests are performed using a 230V 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).

voltage difference will be a function of

the null detector that is used. Exam-

5-7 CONSTANT VOLTAGE TESTS

ples of satisfactory null detectors are:

419A null detector, a dc coupled oscilloscope utilizing differential input, 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.

5-8 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.

RECOMMENDED

MODEL

----

Figure 5-1. Differential Voltmeter Substitute

Test Setup

Care must be exercised to avoid ground

loops and circulating currents when using an electronic null detector in which one input terminal is grounded.

5-9 To avoid mutual coupling effects, each monitoring device must be’ connected to the output terminals 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 . 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

+OUT and -OUT terminals of supply, observing

5-2

Figure 5-2. Constant Voltage Load Regulation

Test Setup

correct polarity.

c. Turn CURRENT controls fully clockwise.

d. Turn on supply and adjust VOLTAGE controls until front panel meter indicates exactly maximum rated output voltage.

e. Differential voltmeter should indicate the following:

6259B, 6260B

6261B

6268B, 6269B

5-11

Load Regulation. Definition: The change static value of dc output voltage resulting from a change in load resistance from open circuit to a value

which yields maximum rated output current (or vice versa).

To check the constant voltage load regula-

5-12

proceed as follows:

tion,

‘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:

6259B, 6260B 1.2mV

6261B

6268B, 6269B

10 ±0.2Vdc 20 ±0.4Vdc 40 ±0.8Vdc

∆ EOUT in the

2.2mV

4.2mV

TM 11-6625-2958-14&P

Line Regulation.

5-13

Definition: The change

static value of dc output voltage re-

sulting from a change in ac input voltage over the specified range from low line (usually 207 volts) to high line

(usually 253 volts), or from high line to low line.

To check the line regulation, proceed as

5-14

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.

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:

6259B,6260B

6261B

6268B, 6269B 4.2mV

Ripple and Noise.

5-15

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)

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.

5-16 The amount of ripple and noise that is present 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 particularly 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 present in the ripple without appreciably increasing the RMS value,

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

∆ EOUT in the

1.2mV

2.2mV

5-3

TM 11-6625-2958-14&P

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 between 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

frequency present on the output of an

120Hz (due to full-wave rectification), an oscilloscope display showing a 120Hz fundamental com-

ponent is indicative of a “clean” measurement setup, 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.

supply is

5-19 Although the method shown in Figure 5-3A is not recommended for ripple measurements, it may

prove satisfactory in some instances provided certain 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.

5-20 To minimize pick up, a twisted pair or (preferably) 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 inducing a signal in the shielded leads.

5-21 To verify that the oscilloscope is not displaying ripple that is induced in the leads or picked 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

Figure 5-3.

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. However, in stubborn cases or in measurement situations where it is essential that both the power supply 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 substituted in place of the shielded two-wire cable with equal success.

Ripple Test Setup

5-4

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 instructions 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:

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 frequency spikes detrimental to the load.

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

O coax cables

must be substituted for the shielded two-wire cable.

2. Impedance matching resistors must be in-

cluded to eliminate standing waves and cable ringing, 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 possible; 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 supply 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

TM 11-6625-2958-14&P

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. 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.

5-27 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

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.

5-30 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.

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 accomplished 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 maximum repetition rate of load switching and makes the clear display of the transient recovery characteristic on oscilloscope more difficult.

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 controls until front panel ammeter indicates 5 amps output current.

d. Close line switch on repetitive load

switch setup.

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 voltage 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.

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

5-33 Temperature Coefficient.

Definition: The change in output voltage per degree Centigrade change in the ambient temperature under conditions 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.

5-35 The temperature coefficient given in the specifications is the maximum temperature-dependent output voltage change which will result over any one degree Centigrade interval. The differential voltmeter or digital voltmeter used to measure the output voltage change of the supply should be placed outside the oven and should have a long term stability adequate to insure that its drift will not affect the overall measurement accuracy.

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 output voltage.

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:

62599,62600

6261B

6268B, 6269B

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 voltmeter or digital voltmeter over the stated measurement

interval; a strip chart recorder can be used to

12mV 22mV 42mV

TM 11-6625-2958-14&P

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. 5-39 To check the output stability, proceed 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

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:

6259B, 62600 6261B, 6268B 8.0mV

6269B 5-40 CONSTANT CURRENT TESTS 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

load. Second, a current monitoring resistor is in-

serted between the output of the power supply and

the load.

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 current 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 resistor used in this unit (A4R123 or A4R123A-A4R123B)

5.0mV

14.0mV

circuit and full

5-7

TM 11-6625-2958-14&P

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.

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.

d. Differential voltmeter should read 0.5 ±

0.01Vdc. 5-44

Load Regulation.

Definition: The change

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.

5-45

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 6260B 6261B 6268B 6269B

∆ IOUT in the

110µv 110µv 110µv 134µv 120µV

Figure 5-8.

5-46 Line Regulation.

Definition: The change

static value of dc output current resulting from a change in ac input voltage over the specified range from low line (usually 207 volts) to high line

(usually 253 volts), or from high line to low line.

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:

Ripple and Noise.

5-48

Definition: The residual ac current which is superimposed on the dc output current

Constant Current Load Regulation

Test Setup

∆ IOUT in the

6259B, 6269B

6260B, 6261B

6268B

120µV 110µV 134µV

5-8

TM 11-6625-2958-14&P

also apply to the measurement of constant current

ripple and noise. important precautions to be observed when measuring the ripple and noise of a constant current supply. The presence of a 120Hz waveform on the oscilloscope is normally indicative of a correct measurement 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 pane 1 ammeter reads exactly maximum rated output current.

d. The observed ripple and noise should be

less than:

Figure 5-9 illustrates the most

6259B 6260B 6261B 6268B 6269B

250µVrms 250µVrms 250µVrms 334µVrms 250µVrms

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.

Most of the instructions pertaining to the

s -49 ground loop and pickup problem-s associated with constant voltage ripple and noise measurement

5-51 TROUBLESHOOTING

5-52 Before attempting to troubleshoot this instrument, 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 determined without having to remove the instrument from the cabinet.

5-53 A good understanding of the principles of operation 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 applicable test points (identified by encircled numbers). 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 location of components and test points.

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 replacements (Paragraph 5-71) and adjustment and calibration (Paragraph 5-73) sections of this manual

5-9

TM 11-6625-2958-14&P

5-56 OVERALL TROUBLESHOOTING PROCEDURE 5-57 To locate the cause of trouble, follow Steps

1, 2, and 3 in sequence:

(1) Check for obvious troubles such as tripped circuit breaker, defective power cord, incorrectly strapped rear terminals, input power failure 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. to Paragraph 5-64 for the main circuit board remov-

Next, remove the top and bot-

(Refer

Table 5-2. Reference and Bias Voltages

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

al procedure. ) If the trouble source cannot be detected by visual inspection, re-install the main circuit board and proceed to Step (2).

(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). Refer to Figure 7-10 for the location of the test points listed in Table 5-2.

(3) Disconnect load and examine Table 5-3 to determine your symptom and its probable cause.

STEP

2 3 4 5

(Overvoltage lamp may be on or off)

METER

COMMON

+S +S +S +S

SYMPTOM

Low or no output voltage

METER

POSITIVE

TP63

TP64 TP65 TP66 TP67

TP68

NORMAL

VDC RIPPLE (P-P)

+12.4 ± 7%

+6.2 ±5%

-6.2 ±5% +11 ±15%

-4.0 ±12.5%

-2.4±12.5%

Table 5-3.

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

NORMAL

2.0mV

0.5mV

2.0mV

2.0V

0.8V

0.4V

Overall Trouble shooting

Front panel meter defective.

CR61, CR62, Q60, Q61, Q62,

Q63 VR60, VR61, Q62, Q63 VR60, VR61, Q62, Q63

C44, CR53, CR54

C44, CR53, CR54, CR45, CR46,

CR47, CR48, CR49

CR54, CR45, CR46, CR47,

CR48, CR49

PROBABLE CAUSE

High output voltage

High ripple

Series regulator or preregulator feedback loop defective.

Refer to Table 5-4. Front panel meter defective.

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

minals (*OUT).

c. Series regulator or preregulator loop defective. If crowbar

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

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

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

5-2.

c. Supply crossing over to constant current operation under

loaded conditions.

5-10

Refer to Table 5-4.

Check current limit setting or constant

Table 5-3.

TM 11-6625-2958-14&P

Overall Troubleshooting (Continued)

SYMPTOM High ripple (continued) Poor line regulation

Poor load regulation

(Constant voltage)

Poor load regulation

(Constant current)

Oscillates (Constant current\constant voltage)

PROBABLE CAUSE

current comparator circuit (Z1 and associated components).

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.

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

5-2.

c. Supply current limiting.

tor circuit (Z1 and associated components). Improper measurement technique. Refer to Paragraph 5-44.

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

5-2.

Supply voltage limiting. Check constant voltage comparator circuit (Z1 and associated components) and voltage clamp circuit, Q1.

d. Leaky C19, A3C3. a. Adjustment of R47.

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

Check constant current compara-

Refer to Paragraph 5-99.

c. Open sensing Iead (+S).

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

(Constant current/constant voltage)

Cannot reach maximum output

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-

lation. back loops, it is necessary to refer to Table 5-4 before proceeding to Tables 5-5, 5-6, or 5-7.

5-59 Tables 5-5, 5-6, and 5-7 contain troubleshooting methods for the series regulator and preregulator feedback loops once the fault has been

Because of the interaction between feed-

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.

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

a. Q20 shorted.

(A4Q103 through A4Q108) open,

One or more of series regulator transistors

isolated to either one.

tain instructions for driving each stage of the

series regulator feedback loop into conduction or cut-off. the fault can be isolated to a circuit or to a component.

5-60 Table 5-7 contains troubleshooting procedures for the preregulator feedback loop. The troubleshooting method is based upon comparing the waveforms shown in Figure 7-9 with those actually found at the various test points in the preregulator control circuit. As indicated in Table

By following the steps in these tables,

Tables 5-5 and 5-6 con-

5-11

TM 11-6625-2958-14&P

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

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.

STEP

ACTION

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

Inspect LINE circuit breaker.

2 Inspect overvoltage lamp on

front pane 1.

Table 5-4.

b. Not tripped;

c. Not tripped;

Feedback Loop Isolation

RESPONSE

a. Tripped.

PROBABLE CAUSE

a. Check rectifier, filter, and

triac for short. Faulty preregulator. Procceed to Step

b. Series regulator loop in

High voltage output.

high voltage condition. Proceed to Step 2.

c. Proceed to Step 2.

Low voltage output.

On.

Check setting of overvoltage adjust (A5R125). Check A4CR110 for short. Series regulator loop in high voltage condition.

Proceed to Step 3.

b. Off;

b. Check setting of overvolt-

High voltage output. age adjust (A5R125).

Check A4CR110 for open, Q91 for open, Q92 for

short.

Series regulator

loop in high voltage con-

dition. Proceed to Step 3.

3 Isolate fault to either series

regulator or preregulator by

using the following steps: to about 9 volts. through A4Q108) for open.

(1) Open the gate lead to triac A2CR1 by disconnecting either end of resistor R88 (TP87 or TP88).

(2) Place a small dc power 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.

off;

Low voltage output.

Output voltage normal.

Variable from O volts

b. Output voltage high.

Varying controls has

little or no effect.

c. Output voltage low,

Varying controls has

little or no effect.

5-12

Check overvoltage adjust

(A5R125). Check A4CR110 for short. Check Q20 for for short.

Proceed to Step

a. Check each series regula-

tor transistor (A4Q103 Then check preregulator

by disconnecting source and proceeding to Table 5-7.

b. High voltage condition in

series regulator.

Proceed to Table 5-5. Leave external source connected.

c. Low voltage condition in

series regulator loop. Proceed to Table 5-6. Leave external source connected.

TM 11-6625-2958-14&P

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

STEP

These tests should be made with

Check turn-off of series regulator transistors A4Q103 through A4Q108 by shorting base (TP101) to emitter

(TP103).

Check turn-off of driver A4Q102 by shorting base

(TP100) to emitter (TP101).

Check conduction of error amplifierA4Q101 by connect-

ing base (TP45) to cathode of CR45 (TP67) through a

100 Ω resistor.

Check conduction of error amplifier Q42 by connecting base (TP44) to cathode of

CR45 (TP67) through a 1K resistor.

ACTION

RESPONSE

external source connected as described

a. Output voltage remains high.

b. Output voltage decreases.

a. Output voltage remains high.

b. Output voltage decreases.

a. Output voltage remains high. b. Output voltage decreases.

a. Output voltage remains high, b. Output voltage decreases.

Ω

PROBABLE CAUSE

in Table 5-4, Step 3.

a. One or more of A4QI03

through A4Q108 shorted or A4CR105 shorted. Check A4R150-A4R155.

b. Remove short. Proceed

to Step 2.

a. A4Q102 shorted. b. Remove short. Proceed

to Step 3.

a. A4Q101 open. b. Remove resistor. Pro-

ceed to Step 4.

a. Q42 open. b. Remove resistor. Pro-

ceed to Step S.

s Check turn-off of mixer am-

plifier Q41 by connecting base (TP40) to +11 volt sup-

ply (TP66) through a 1K resistor.

6 Check turn-off of constant

voltage comparator Z 1 by

shunting R 1 with a 10K

sistor, or by installing a

Ω resistor in R1 position

10K if resistor is not installed in the supply.

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

STEP

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

Check conduction of series

regulator transistors A4Q103

through A4Q108 by connect-

ing base (TP101) to +11 volt

supply (TP66) through a 100

ohm resistor.

ACTION

Ω

Ω re-

a. Output voltage remains high. b. Output voltage decreases.

a. Qutput voltage remains high.

b. Output voltage decreases.

RESPONSE

a. Output voltage remains low.

b. Output voltage rises.

a. Q41 shorted. b. Remove resistor. Pro-

ceed to Step 6.

a. Z1 defective, R110

shorted.

b. R23 open, open strap

between A 1 and A2, A5R121 or A5R122 open.

PROBABLE CAUSE

A4Q103 throughA4Q108

open and/or A4R150 through A4R155 open, A4CR106 shorted.

Remove resistor. Pro-

ceed to Step 2.

5-13

TM 11-6625-2958-14&P

Table 5-6.

Series Regulator Troubleshooting, Low Voltage Condition (Continued)

STEP

5 Isolate fault to either con- a, Output voltage rises.

6 Check conduction of mixer a. Output voltage remains low.

Check conduction of driver A4Q102 by shorting A4Q101 switch A4TS101 open. emitter (TP100) to base

(TP45).

Check turn-off of error amplifier A4Q10 1 by connecting

base (TP45) to Q42 base

(TP44).

Check turn-off of error am-

plifier Q42 by connecting base (TP44) to +11V supply (TP66) through a 1K Ω resistor.

stant voltage comparator or

constant current comparator by opening the cathode of

CR20.

amplifier Q41 by connecting base (TP40) to +S terminal.

ACTION

RESPONSE

a. Output voltage remains low. a. A4Q102 open, thermal

b. Output voltage rises. b. Remove short. Proceed

a, Output voltage remains low. b. Output voltage rises. b. Remove short. Proceed

a. Output voltage remains low, a. Q42 shorted. b. Output voltage rises. b. Remove resistor. Pro-

b. Output voltage remains low. b. Reconnect lead and

b. Output voltage rises.

PROBABLE CAUSE

to Step 3.

a. A4Q101 or CR44 shorted.

to Step 4.

teed to Step 5.

a. Z1 defective, open

strap between A6 and

A7, or shorted A5R123

or A5R124.

proceed to Step 6.

a. Q41 or CR40 open, Q40

shorted.

b. Remove short. Proceed

to Step 7.

STEP

1 Connect oscilloscope be-

Check conduction of con-

stant voltage comparator Z 1 by shunting R110 with a 10K ohm resistor, or by installing

Ω resistor in R110 po-

a 10K

sition if resistor is not in-

stalled in the supply.

Table 5-7.

ACTION

A differential oscilloscope must be used for these tests in order to avoid a potentially dangerous shock hazard.

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

tween TP89 (+) and TP86 (-).

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

a. Output voltage remains low. a. Z1 defective, R1

shorted.

b. Output voltage rises.

RESPONSE

Floating a single-ended oscilloscope for these tests is not

a. Normal waveform.

b. Little or no voltage.

b. A5R121 and A5R122

shorted, open strap’ between AZ and A3, R5 open, C2 shorted, CR7

shorted.

PROBABLE CAUSE

a. Defective A2CR1, R88,

CR88, A2L1A/A2L1B,

T1, A2C1, A2R1.

b. Proceed to Step 2.

5-14

Table 5-7. Preregulator Troubleshooting (Continued)

TM 11-6625-2958-14&P

STEP

Connect oscilloscope between TP85 (+) and TP103

(-).

Connect oscilloscope between TP80 (+) and TP103

ACTION

RESPONSE

a. Normal waveform.

b. Little or no voltage.

Amplitude incorrect.

(-).

b. Period incorrect.

Connect oscilloscope be- a. Amplitude, dc reference or

tween TP82 (+) and TP103 period incorrect.

(-).

5 Connect oscilloscope be- a. Amplitude, dc reference or

tween TP81 (+) and TP103 period incorrect.

(-) .

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 instructions for converting the supply to 115Vac operation, reference is made to the RFI assembly removal procedure in order to allow access to the bias transformer (A3T2) primary connections.

5-64 Main C

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 removal. Care must be taken that rear barrier strip clears opening in rear panel.

Front Panel (A5) Removal. To remove the

5-65

front panel, proceed as follows:

a. Unplug unit, turn supply upside down, and remove four screws holding handlers to front

panel.

b. Front panel may now be swung outward,

hinging on wires to LINE circuit breaker. Access

is provided to all panel-mounted components. 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).

c. Sufficient lead length is provided to al-

low capacitors to be lifted partially out of instru-

ment. 5-67 RFI Assembly

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 “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 Figure 7-1). and A2L1A/A2L1B with its jumpers for 115/230 volt operation.

mounting bracket to heat sink. (Two of the screws

PROBABLE CAUSE

Defective T70.

b. Defective Q72, Q73,

CR76, or C71. proceed to Step 3.

Defective Q71, C70, C72, CR74, CR75, R82, R75, or R78.

b. CR78 defective. Pro-

ceed to Step 4.

Defective CR82, CR84, CR79, CR80, CR77, CR78. Check

R87.

Defective CR81, CR83, R86, R83, C73.

(A2) Removal. To remove the

Two of the screws are acces -

This allows access to A2R1, A2C1,

Remove four screws holding A2L1A/A2LlB

5-15

TM 11-6625-2958-14&P 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.

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 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.

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 section 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.

Maneuver heat sink assembly downwards 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 flange.

mounted on heat sink except resistors A4R150 through A4R155, and A4R123,

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:

in Paragraph 5-68 above. sink assembly partially into chassis so fan (A4B1)

is protruding above chassis.

washers attaching fan mounting plate to heat sink.

Do not remove fan from mounting plate. When reassembling heat sink, do not overtighten these

screws. Too much tension will damage the insu-

lating rods.

pling resister A4R123 to topmost two portions of heat sink.

Access is now provided to all components

Remove heat sink assembly as described

b. Turn supply upside down and place heat

Remove four screws and four shoulder

d. Remove two screws holding current sam-

4) Removal. In order to gain ac-

For the location of these

If necessary, the resistor may be

unsoldered at this point.

Remove mounting nuts from A4CR106 on left side of heat sink, and from A4CR108 on right 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.

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.

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 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

to back panel.

d. Remove two screws holding main circuit

board support tray to internal chassis divider.

Working from top rear of supply, inter-

e, connection circuit board (still attached to main circuit board support tray) can be angled up enough to allow access.

f. If necessary to completely remove interconnection circuit board, remove two screws holding board to support tray, one screw holding capacitor 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.

5-71 REPAIR AND REPLACEMENT

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).

Remove mounting nuts, bolts

Move panel away from frame.

5-16

TM 11-6625-2958-14&P

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

REFERENCE

Q1 Q20 Q40, Q41

Q42, A4Q101, A4Q102

Q60, Q61, Q62, Q63

Q70 Q71, Q72, Preregulator control cir- Output voltage, rippIe imbalance, and

Q73

FUNCTION OR CIRCUIT

Constant voltage and con-

stant current differential

amplifiers.

Voltage clamp circuit.

Short circuit protection. Output current, protection action.

Mixer amplifier. CV/CC load reguIation. CV transient

Driver and error amplifiers.

Reference regulator.

Overvoltage limit.

cuit.

Constant voltage (CV) line and load reguIation. Zero volt output.

Constant current (CC) line and load regulation. Zero current output.

CC load regulation.

response. CV/CC load regulation.

+12.4V, +6.2V, and -6.2V reference voltages and reference circuit line operation.

Limiting action and level.

preregulator waveforms.

CHECK

ADJUST

R110, or R113 (OPtion 020); R117, or R119

(Option

021)

---

R47

---

R70, R82

Q90, Q91, Q92

A4Q103 thru A4Q108

A42CR1 CR1, CR20 CR2, CR3 CR4, CR40,

CR41

CR5, CR6, CR21

CR7, CR60, CR61, CR62

CR35, CR36, CR37

CR43, CR45 thru CR49, CR53, CR54

Crowbar.

Series regulator.

Preregulator. CV/CC OR gate. Voltage clamp circuit. Temperature stabilizing

diodes. Limiting diodes.

Reference regulator.

Turn-on circuit.

Bias supply.

Crowbar action, trip voltage, voltage across series regulator when tripped.

CV/CC load regulation.

Output voltage. CV/CC crossover operation. CC load regulation. Temperature coefficient.

CV/CC load regulation.

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

Preregulator control turn-on delay.

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

A5R125

---

R7O

---

CR44, CR50

Driver and error amplifier.

Down-programming speed, CV/CC

load regulation.

5-17

---

TM 11-6625-2958-14&P

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

REFERANCE

CR90 thru

CR93, A4CR108, A4CR110

A4CR101 thru A4CR104

A4CR105

and

A4CR106

VR1

VR40

FUNCTION OR CIRCUIT

Crowbar.

Main rectifier diodes.

Reverse voltage protection.

Voltage clamp circuit.

Mixer amplifier stabilization diode.

CHECK

Limiting action and level.

Output voltage, ripple imbalance, and preregulator waveforms.

Trip voltage, voltage across series regu-

lator when crowbar is tripped, supply stability.

Voltage across main filter capacitors.

Output voltage.

CC load regulation. CV transient response.

+6.2V and -6.2V reference voltages. Trip voltage.

ADJUST

---

R70, R82

R95,

A5R125

---

R47

---

R95,

A5R125

5-73 ADJUSTMENT AND CALIBRATION

5-74 Adjustment and calibration may be required after performance testing, troubleshooting, or repair and replacement.

Perform only those adjustments that affect the operation of the faulty circuit and no others.

5-75 METER ZERO .5-76 The meter pointer must rest on the zero cal-

ibration mark on the meter scale when the instrument is at normal operating temperature, resting in its normal operating position, and turned off. To zero set the meter proceed as follows:

Connect load resistor of value shown in

Figure 5-2.

b. Turn on instrument and allow it to come up to normal operating temperature (about 30 minutes).

c. Turn instrument off.

Wait one minute for

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.

Rotate plastic disc clockwise until me-

ter reads zero, then rotate counterclockwise

slightly in order to free adjustment screw from meter suspension. Pointer should not move during

latter part of adjustment. 5-77 VOLTMETER CALIBRATION 5-78 To calibrate the voltmeter, proceed as fol-

lows:

Connect differential voltmeter across

supply, observing correct polarity.

b. Turn on supply and adjust VOLTAGE controls 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.

5-79 AMMETER CALIBRATION 5-80 To calibrate the ammeter, proceed as fol-

lows:

Connect test setup shown in Figure 5-8. b. Turn VOLTAGE controls fully clockwise. c.

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

5-81 CONSTANT VOLTAGE PROGRAMMING

CURRENT

5-82 Zero Output Voltage. To calibrate the zero

voltage programming accuracy, proceed as directed 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.

a. Connect differential voltmeter between

+OUT and -OUT bus bars.

b. If unit is to be used in local programming mode, turn VOLTAGE controls fully counterclockwise. If unit is to be used in remote programming 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.

5-84 Standard instrument with non-unity gain voltage programming.

Perform Steps (a) and (b) in Paragraph

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).

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.

TM 11-6625-2958-14&P

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 (labeled "VOLTAGE ZERO" and accessible through hole in’ rear panel) until reading is exactly zero.

5-86 Option 020 with non-unity gain 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 voltmeter is not exactly zero volts, adjust potentiometer R112 (labeled “VOLTAGE PROG” and accessible through hole in rear panel) until reading is exactly zero.

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.

Model

62596 62606 62616 6268B

62696

b. Disconnect strap between terminals Al

and A2 on rear barrier strip.

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).

Rotate CURRENT controls fully clockwise

and turn on supply.

f. Adjust decade resistance box until dif-

ferential voltmeter indicates exactly maximum rated output voltage.

g. Replace decade resistance box with

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

Value

2K Ω

4K Ω 8K Ω 8K Ω

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

circuit Board

5-85 Option 020 with resistance or unity-gain

5-89 Option 020.

Perform Steps (a) through (c) in Paragraph

5-88.

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

5-19

TM 11-6625-2958-14&P exactly maximum rated output voltage.

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.

5-92 Standard instrument with resistance or unity-gain voltage programming.

Connect test setup shown in Figure 5-8.

b. If unit is to be used in local programming mode, turn CURRENT controls fully counterclockwise. gramming mode, connect remote programming setup

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

voltage to zero. (minimum).

c. Connect decade resistance box between

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.

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. 5-93 Standard instrument with non-unity gain

voltage programming.

5-92.

b. Solder jumper between “wiper” pad and

“-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).

c. 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).

d. 5-92.

If unit is to be used in remote pro-

Adjust decade resistance box until dif-

Perform Steps (a) and (b) in Paragraph

Connect decade resistance box between

Perform Steps (d) through (f) in Paragraph

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.

5-96 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.

5-97 Standard instrument.

a. Connect test setup shown in Figure 5-8. b, Disconnect strap between terminals A5

and A6 on rear barrier strip.

Connect 0.1%, 1/8 watt resistor of value shown below between terminals A4 and A6 on rear barrier strip.

Mode 1

6259B 6260B 6261B 6268B 6269B

d. Connect decade resistance box in place

of R30 (mounted on standoffs on main circuit

board; see Figure 7-1 O).

Rotate VOLTAGE controls fully clockwise

and turn on supply.

f. Adjust decade resistance box until dif-

ferential voltmeter indicates exactly 0.5Vdc.

Replace decade resistance box with fixed, composition, 5%, 1/2 watt resistor of same value.

and turn on supply.

panel) until differential voltmeter indicates exactly

5-98 Option 021.

Perform Steps (a) through (c) in Paragraph

5-97.

b. Rotate VOLTAGE controls fully clockwise c. Adjust potentiometer R116 (labeled “CUR-

RENT PROG” and accessible through hole in rear

0.5Vdc.

Value

200 200 200

180 200

Ω Ω Ω Ω Ω

5-94 Option 021 with resistance or unity-gain voltage programming.

Perform Steps (a) and (b) in Paragraph

5-92.

b. Rotate VOLTAGE controls fully clockwise

and turn on supply.

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

gramming.

Perform Steps (a) and (b) in Paragraph

5-92.

5-99 TRANSIENT RECOVERY TIME 5-100 To adjust the transient response, proceed

as follows:

Connect test setup shown in Figure 5-5.

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

in Paragraph 5-32.

Adjust R47 until transient response is

within specification as shown in Figure 5-6.

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

5-102 This procedure ensures balanced operation

of the triac by ensuring that the conduction time

5-20

is equal in either direction (within 25%). To check for imbalance, proceed as follows:

Connect appropriate Ioad resistance

across rear output terminals of supply as follows:

MODEL

6259B 6260B 62610 6268B 6269B

b. Connect variable auto transformer between 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.

e. Adjust oscilloscope to observe 120Hz sawtooth waveform. 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.

Turn on supply and adjust decade resist-

ance to reduce imbalance to within 25%. ac and insure that imbalance does not exist any-

where within this range. equivalent resistor.

9. h. Vary input line voltage from 207 to 253V

Load Resistance

0.2 Ω 500W, ±5% O.1 Ω, 1000W, ±5%

0.4

Ω, 1000W, ±5%

1.33 Ω, 1200W, ±5%

0.8 Ω, 2000W, ±5%

Peak amplitudes of adjacent

Replace decade box with

NOTE

TM 11-6625-2958-14&P

Connect dc voltmeter acress series reg-

ulator (TP102 and TP103).

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.

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 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 voltmeter reading variation is minimal and within range of 3.2 to 3.8Vdc. alent resistor.

5-105 50Hz OPERATION (Option 005)

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

1/2 watt resistor, and check ripple imbalance as described in Steps (a) through (e) of Paragraph

5-101.

b. Perform preregulator tracking adjustment

described in Paragraph 5-103.

Voltmeter reading should

Rep lace decade box with equiv-

Ω, ±5%,

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.

5-103 PREREGULATOR TRACKING (50 and 60Hz

Operation)

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:

Model

62S9B 6260B 6261B 6268B 6269B

b. Connect variable auto transformer be-

tween input power source and power supply power

input adjust auto transformer for 230Vac input to supply.

Load Resistance

0.2

0.1 Ω, 1000W, ±5%

0.4

1.33

0.8

500W, ±5%

Ω

Ω, 1000W, ±5%

Ω,

1200W, ±5%

2000W, ±5%

Ω,

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.

f. Turn on supply and set desired operating

output voltage.

NOTE

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

5-21

TM 11-6625-2958-14&P

be set much closer to the operating output voltage of the supply.

5-109 MAXIMUM CROWBAR TRIP VOLTAGE 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).

c. Connect decade resistance box in place of R95 (mounted on standoffs on main circuit board).

d. Turn on supply and adjust VOLTAGE controls for output voltage shown below:

Model 6259B 12Vdc 6260B

Value

12Vdc

Model 6261B 23Vdc 6268B 6269B

Adjust decade resistance box until crow-

bar trips (amber OVERVOLTAGE lamp lights up).

Replace decade resistance with appropriate value resistor in R95 position and reconnect resistor R72. Maximum crowbar trip voltage is

now set at voltage given in Step (d).

5-111 CROWBAR DISABLEMENT

5-112 To disable the crowbar completely, disconnect either end of R98 (TP97 or TP98). This resis-

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

ure 7-10).

Value

45Vdc

5-22

SECTION VI

REPLACEABLE PARTS

TM 11-6625-2958-14&P

6-1 INTRODUCTION

6-2 This section contains information for ordering

replacement parts. Table 6-4 lists parts in alphanumeric order by reference designators and provides the following information:

Reference Designators. Refer to Table 6-1.

b. Description.

Refer to Table 6-2 for ab-

breviations.

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.

d. Manufacturer’s Part Number or Type.

Manufacturer’s Federal Supply Code Num-

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

f. Hewlett-Packard Part Number.

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-

chanical and/or Miscellaneous.

The former consists

of parts belonging to and grouped by individual as-

semblies; the latter consists of all parts not im-

mediately associated with an assembly.

6-3 ORDERING INFORMATION

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 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.

Table 6-1. Reference Designators

= assembly = blower (fan)

= capacitor

= circuit breaker

= diode

= device, signal- L

ing (lamp)

= miscellaneous

electronic part

F = fuse

= jack, jumper

= relay

= inductor

M = meter

Table 6-1.

= plug = transistor

Q R

= resistor

s = switch

= transformer

= terminal block

= therms 1 switch

Reference Designators (Continued)

v . vacuum tube,

VR x z

Table 6-2. Description Abbreviations

= ampere = alternating

mf r mod.

current

= assembly

ass y.

= board

bkt = bracket

°C

= degree

Centigrade

= card

cd coef

= coefficient

comp

= composition

CRT

= cathode-ray

mtg n

NC NO NP

W obd

tube

= center-tapped

= direct current

DPDT = double pole,

double throw

DPST = double pole,

P.C. pot. = potentiometer P-P

ppm

single throw elect = electrolytic encap =

encapsulated

= farad

= degree

pvr

rect = rectifier rms

Farenheit

= fixed

fxd

= germanium

Ge H

= Henry

= Hertz

= integrated

circuit

= inside diameter

ID incnd = k m M

µ met.

incandescent = kilo =10 = mini = = mega = 10 = micro = 10 = metal

10-

-6

SPDT = single pole, SPST = single pole,

tan.

var ww

w = Watt

neon bulb, photocell, etc.

= zener diode

= socket

= integrated cir-

cuit or network

= manufacturer = modular or

modified = mounting = nano =10-

= normally closed = normally open = nickel-plated = ohm = order by

description = outside

diameter

= pico =10-

= printed circuit = peak-to-peak

= parts per

million

= peak reverse

voltage

= root mean

square

= silicon

double throw

single throw = small signal = slow-blow = tantulum = titanium = volt = variabIe = wirewound

6-1

TM 11-6625-2958-14&P

Table 6-3.

Code List of Manufacturers

CODE

NO.

00629 00656 00853

01121 01255

01281 01295

01686 01930 02107 02114 02606 02660 02735

03508 03797

03877 03888 04009 04072

04213 04404 04713 05277 05347

05820 06001

06004 06486 06540 06555 06666 06751 06776

06812 07137

MANUFACTURER EBY Sales Co. , Inc.

Aerovox Corp.

Sangamo Electric Co.

S. Carolina Div.

Allen Bradley Co.

Litton Industries, Inc. TRW Semiconductors, Inc. Texas Instruments, Inc.

Semiconductor-Components Div.

RCL Electronics, Inc. Manchester, N. H.

Amerock Corp.

Sparta Mfg. Co. Ferroxcube Corp. Fenwal Laboratoriess

Amphenol Corp.

Radio Corp. of America, Solid State

and Receiving Tube Div. Somerville, N. J.

G. E. Semiconductor Products Dept.

Eldema Corp. Transitron Electronic Corp.

Pyrofilm Resistor Co. Inc.

Arrow, Hart and Hegeman Electric Co.

ADC Electronics, Inc. Harbor City, Calif,

Caddell & Bums Mfg. Co. Inc.

*Hewlett-Packard Co. Palo Alto Div, Motorola Semiconductor Prod. Inc.

Westinghouse Electric Corp.

Semiconductor Dept. Ultronix, Inc. Wake field Engr. Inc. Wakefield, Mass. General Elect, Co. Electronic

Capacitor & Battery Dept.

Bassik Div. Stewart-Warner Corp.

IRC Div. of TRW Inc.

Semiconductor Plant

Amatom Electronic Hardware Co. Inc.

Beede Electrical Instrument Co. General Devices Co. Inc. Semcor Div. Components, Inc. Robinson Nugent, Inc.

Torrington Mfg. Co. , West Div. Transistor Electronics Corp.

New Bedford, Mass.

Milwaukee, Wis.

Beverly Hills, Caltf.

Lawndale, Calif.

Saugerties, N. Y.

Morton Grove, Ill.

Compton, Calif.

Wakefield, Mass.

Cedar Knolls, N. J.

Hartford, Corm.

Palo Alto, Calif,

Phoenix, Arizona

Youngwood, Pa.

Grand Junction, Colo.

Bridgeport, Corm.

New Rochelle, N. Y.

Penacook, N. H.

Indianapolis, Ind.

Phoenix, Arizona

New Albany, Ind.

Van Nuys, Calif.

Minneapolis, Minn.

ADDRESS

Jamaica, N. Y.

Pickens, S. C.

Dallas, Texas

Rockford, 111.

Dover, Ohio

Broadview, Ill.

Syracuse, N. Y.

Mineola, N. Y.

Irmo, S. C.

Lynn, Mass.

CODE

NO. 07138 07263

07387 07397

07716 07910 07933

08484

08530 08717 08730 08806

08863 08919 09021

09182 09213 09214 09353

09922 11115

11236 11237

11502 11711 12136 12615

12617 12697 13103 14493

14655

14936 15801

16299

MANUFACTURER Westinghouse Electric Corp.

Electronic Tube Div.

Fairchild Camera and Instrument

Corp. Semiconductor Div.

Mountain View, Calif. Birtcher Corp-,The Sylvania Electric Prod. Inc.

Sylvania Electronic Systems

Western Div.

IRC Div. of TRW Inc. Burlington Plant

Continental Device Corp. Raytheon Co. Components Div.

Semiconductor Operation

Breeze Corporations, Inc. Reliance Mica Corp.

Sloan Company, The

Vemaline Products Co. Inc. Wyckoff, N. J. General Elect. Co. Minia-

ture Lamp Dept. Cleveland, Ohio Nylomatic Corp. RCH Supply Co.

Airco Speer Electronic Components

*Hewlett-Packard Co. New Jersey Div.

General Elect. Co. Semiconductor

Prod. Dept. Buffalo, N. Y.

General Elect. Co. Semiconductor

Prod. Dept. C & K Components Inc. Burndy Corp. Wagner Electric Corp.

Tung-Sol Div. CTS of Berne, Inc. Berne, Ind. Chicago Telephone of Cal. Inc.

IRC Div. of TRW Inc. Boone Plant General Instrument Corp

Rectifier Div.

Philadelphia Handle Co. Inc.

U. S. Terminals, Inc. Cincinnati, Ohio Hamlin Inc. Clarostat Mfg. Co. Inc. Thermally Co. Dallas, Texas *Hewlett-Packard Co. Loveland Div.

Comell-Dubilier Electronics Div.

Federal Pacific Electric Co.

General Instrument Corp. Semicon-

ductor Prod. Group Hicksville, N. Y. Fenwal Elect. Corning Glass Works, Electronic

Components Div.

Los Angeles, Calif.

Mountain View, Calif.

Burlington, Iowa

Hawthorne, Calif.

Mountain View, Calif.

Sun Valley, Calif.

Norrisville, Pa.

Rockaway, N. J.

Norwalk, Corm.

Bloomfield, N. J.

So. Pasadena, Calif.

Lake Mills, Wisconsin

Loveland, Colo.

Framingham, Mass.

ADDRESS

Elmira, N. Y.

Union, N. J.

Brooklyn, N. Y.

Vernon, Calif.

Bradford, Pa.

Auburn, N. Y.

Newton, Mass.

Boone, N.C.

Newark, N. J.

Camden, N. J.

Dover, N. H.

Newark, N. J.

Raleigh, N. C.

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

6-2

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

TM 11-6625-2958-14&P

CODE

NO. 16758 17545 17803

17870 18324

19315 19701 21520 22229 22753

23936 24446 24455

24655 24681

26982 27014

28480 28520 28875

31514

31827 33173 35434 37942

42190

43334

44655

46384 47904

49956 55026

56289 58474 58849

59730 61637 63743

MANUFACTURER Delco Radio Div. of General Motors Corp.

Atlantic Semiconductors, Inc.

Asbury Park, N. J.

Fairchild Camera and Instrument Corp

Semiconductor Div. Transducer Plant

Mountain View, Callf.

Daven Div. Thomas A. Edison Industries

McGraw-Edison Co. Slgnetics Corp. Bendix Corp. The Navigation and

Control Div.

Electra/Midland Corp. Fansteel Metallurgical Corp. Union Carbide Corp. Electronics Div. UID Electronics Corp.

Pamotor, Inc. General Electric Co. General Electric Co. Lamp Div. of Con-

sumer Prod. Group

Nela Park, Cleveland, Ohio General Radio Co. LTV Electrosystems Inc Memcor/Com-

ponents Operations Dynacool Mfg. Co. Inc. Saugerties, N.Y. National Semiconductor Corp.

Hewlett-Packard Co. Heyman Mfg. Co.

IMC Magnetics Corp.

New Hampshire Div. SAE Advance Packaging, Inc.

Budwig Mfg. Co.

G. E. Co. Tube Dept.

Lectrohm, Inc. P. R. Mallory & Co. Inc.

Muter Co. New Departure-Hyatt Bearings Div.

General Motors Corp.

Ohmite Manufacturing Co.

Penn Engr. and Mfg. COrp.

Polaroid Corp. Raytheon Co. Simpson Electric Co. Div. of American

Gage and Machine Co.

Sprague Electric Co. North Adams, Mass. Superior Electrlc Co. Syntron Div. of FMC Corp.

Thomas and Betts Co.

Union Carbide Corp. Ward Leonard Electric Co.

Sunnyvale, Callf.

Mineral Wells, Texas

No. Chicago, Ill.

Mountain View, Calif.

Hollywood, Fla.

Schenectady, N.Y.

West Concord, Mass.

Huntington, Ind.

Santa Clara, Callf.

Palo Alto, Calif. Kenilworth, N. J.

Rochester, N. H.

Santa Ana, Callf.

Owensboro, Ky.

Indianapolis, Ind.

Sanclusky, Ohio

Doylestown, Pa.

Cambridge, Mass.

Lexington, Mass.

Homer City, Pa.

Philadelphia, Pa.

New York, N. Y.

Mt. Vernon, N. Y.

ADDRESS

Kokomo, I.nd.

Orange, N. J.

Teterboro, N. J.

Pampa, Texas

Ramona, Calif.

Chicago, Ill.

Chicago, 111.

Skokie, 111.

Chicago, 111.

Bristol, Corm.

CODE

NO.

70563 70901 70903

71218

71279 71400

71450

71468 71590 71700 71707

71744 71785 71984

72136

72619

72699

72765

72962

72982

73096

73138

73168

73293 73445

73506

73559 73734

74193 74545 74868

74970 75042 75183

75376 75382 75915 76381

76385 76487

76493

MANUFACTURE R

Amperite Co. Inc.

Beemer Engrg. Co. Belden Corp. Bud Radio, Inc.

Cambridge Thermionic Corp.

Bussmann Mfg. Div. of McGraw &

Edison Co.

CTS Corp.

I. T. T. Cannon Electric Inc.

Globe-Union Inc.

Centralab Div. Milwaukee, Wis.

General Cable Corp. Cornish

Wire Co. Div. Coto Coil Co. Inc. Chicago Miniature Lamp Works

Cinch Mfg. Co. and Howard

B. Jones Div. Dow Coming Corp. Electro Motive Mfg. Co. Inc.

Dialight Corp. General Instrument Corp. Drake Mfg. Co. Elastic Stop Nut Div. of

Amerace Esna Corp. Erie Technological Products Inc. Erie, Pa. Hart Mfg. Co. Beckman Instruments Inc.

Helipot Div. Fenwal, Inc. Hughes Aircraft Co. Elecmon

Dynamics Div. Torrance, Calif.

Amperex Electronic Corp.

Bradley Semiconductor Corp.

Carling Electric, Inc.

Federal Screw Products, Inc.

Heinemann Electric Co.

Hubbell Harvey Inc.

Amphenol Corp. Amphenol RF Div.

E. F. Johnson Co. IRC Div. of TRW, Inc. l Howard B. Jones Div. of Cinch

Mfg. Corp.

Kurz and Kasch, Inc. Kilka Electric Corp. Llttlefuse, Inc. Minnesota Mining and Mfg. Co.

Minor Rubber Co. Inc. James Millen Mfg. Co. Inc.

J. W. Miller Co.

Union City, N. J.

Fort Washington, Pa.

Willoughby, Ohio

Cambridge, Mass.

Los Angeles, Callf.

Williams town, Mass.

Providence, R. 1.

Midland, Mich.

Willimantic, Corm.

Harwood Heights, Ill.

Hartford, Corm.

Fullerton, Calif.

Ashland, Mass.

Hicksville, N, Y.

New Haven, Corm.

Hartford, Corm.

Bridgeport, Corm.

Danbury, Corm.

Waseca, Minn.

Philadelphla, Pa.

New York, N. Y.

Mt. Vernon, N. Y.

Des Plaines, Ill.

St. Paul, Minn.

Bloomfield, N.J.

Maiden, Mass.

Compton, Callf.

ADDRESS

Chicago, III.

St. Louis, Mo.

EIkhart, Ind.

Chicago, Ill.

Chicago, III.

Brooklyn, N. Y.

Newark, N. J.

Union, N. J.

Chicago, Ill.

Trenton, N. J.

Dayton, Ohio

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

6-3

TM 11-6625-2958-14&P

Table 6-3.

Code List of Manufacturers (Continued)

CODE

NO.

76530

768.54 77068

77122 77147 77221

77252 77342 77630 77764

78189

78452

78488

78526

78553

78584

79136

79307

79727

79963

80031

80294

81042 81073

81483 81751

82099

82142

82219

82389

82647

82866 82877

82893

83058

83186

83298

83330

83385

83501

MANUFACTURER Cinch City of Industry, Calif.

Oak Mfg. Co. Div. of Oak

Electro/Netics Corp.

Bendix Corp. , Electrodynamics Div. Palnut Co.

Patton -Mac Guyer Co.

Phaostron Instrument and Electronic Co.

Philadelphia Steel and Wire Corp.

American Machine and Foundry Co.

Potter and Brumfield Div. Princeton, Ind.

TRW Electronic Components Div. Resistance Products Co.

Illinois Tool Works Inc. Shakeproof Div. Everlock Chicago, Inc.

Stackpole Carbon Co. Stanwyck Winding Div. San Fernando

Electric Mfg. Co. Inc. Newburgh, N.Y. Tinnerman Products, Inc. Cleveland, Ohio Stewart Stamping Corp. Waldes Kohinoor, Inc. Whitehead Metals Inc. New York, N. Y. Continental-Wirt Electronics Corp.

Zierick Mfg. Co. Mt. Kisco, N.Y. Mepco Div. of Sessions Clock Co.

Bourns, Inc. Howard Industries Div. of Msl Ind. Inc.

Grayhiil, Inc. La Grange, III. International Rectifier Corp.

Columbus Electronics Corp. Yonkers, N. Y.”

Goodyear Sundries & Mechanical Co. Inc.

Airco Speer EIectronic Components

Sylvania Electric Products Inc.

Electronic Tube Div. Receiving

Tube Operations Switchcraft, Inc. Metals and Controls Inc. Control

Products Group Research Products Corp. Rotron Inc. Vector Electronic Co. Cam Fastener Co. Victory Engineering Corp.

Bendix Corp. Electric Power Div. Herman H. Smith, Inc.

Central Screw Co. Gavitt Wire and Cable Div. of

Amerace Esna Corp.

Crystal Lake, III.

No. Hollywood, Calif.

Mountainside, N. J.

Providence, R. I.

South Pasadena, Calif.

Philadelphia, Pa.

Morristown, N. J.

Riverside, Calif.

El Segundo, Calif.

Attleboro, Mass.

Woodstock, N. Y.

Glendale, Calif.

Cambridge, Mass.

Springfield, N. J.

Eatontown, N, J.

BrookfieId, Mass.

ADDRESS

Camden, N. J.

Harrisburg, Pa.

Elgin, Ill.

Chicago, 111.

St. Marys, Pa.

Yonkers, N. Y.

L.I.C., N.Y.

Racine, Wise.

New York, N. Y.

Du Bois, Pa.

Emporium, Pa.

Chicago, Ill.

Madison, Wis.

Brooklyn, N. Y.

Chicago, Ill.

CODE

NO. 83508 83594 83835

83877 84171

84411 86684

86838 87034

87216 87585

87929 88140

88245 90634

90763 91345

91418 91506 91637 91662 91929

92825 93332

93410 94144

94154 94222

95263 95354 95712

35987 96791

97464 97702 98291

98410 38978

39934

MANUFACTURER

Grant Pulley and Hardware Co.

West Nyack, N. Y.

Burroughs Corp. Electronic

Components Div. U. S. Radium Corp. Yardeny Laboratoriess, Inc.

Arco Electronics, Inc.

TRW Capacitor Div. Ogallala, Neb.

RCA Corp. Electronic Components

Rummel Fibre Co. Marco & Oak Industries a Div. of Oak

Electro/netics Corp.

Philco Corp. Lansdale Div. Lansdale, Pa. Stockwell Rubber Co. Inc.

Tower-Olschan Corp. Cutler-Hammer Inc. Power Distribution

and Control Div. Lincoln Plant

Litton Precision Products Inc, USECO

Div. Litton Industries Van Nuys, Calif. Gulton Industries Inc. United-Car Inc. Chicago, III. Miller Dial and Nameplate Co.

Radio Materials Co.

Augat, Inc.

Dale Electronics, Inc. Columbus, Neb. Elco Corp. Honeywell Inc. Div. Micro Switch

Whitso, Inc. Schiller Pk. , III.

Sylvania Electric Prod. Inc. Semi-

conductor Prod. Div.

Essex Wire Corp. Stemco

Controls Div.

Raytheon Co. Components Div.

Ind. Components Oper.

Wagner Electric Corp.

Tung-Sol Div. Livingston, N. J. Southco Inc.

Leecraft Mfg. Co. Inc.

Method Mfg. Co. Rolling Meadows, III, Bendix Corp. Microwave

Devices Div. Franklin, Ind.

Weckesser Co. Inc. Chicago, Ill.

Amphenol Corp. Amphenol

Controls Div.

Industrial Retaining Ring Co. IMC Magnetics Corp. Eastern Div. Sealectro Corp.

ETC Inc.

‘International Electronic Research Corp.

Renbrandt, Inc.

Morristown, N.J.

Great Neck, N.Y

Anaheim; Calif.

Philadelphia, Pa.

Bridgeport, Corm.

El Monte, Calif.

Attleboro, Mass.

Willow Grove, Pa.

Mansfield, Ohio

Janesville, Wis.

Westbury, N. Y.

Mamaroneck, N. Y.

Cleveland, Ohio

ADDRESS

Plainfield, N.J.

New York, N.Y.

Harrison, N. J.

Newark, N, J.

Lincoln, III.

Metuchen, N,J.

Chicago, Ill.

Freeport, Ill.

Woburn, Mass.

Quincy, Mass.

Lester, Pa.

L.I.C., N.Y.

Irvington, N.J.

Burbank, Calif.

Boston, Mass.

6-4

Table 6-4.

Replaceable Parts

TM 11-6625-2958-14&P

REF.

DESIG.

Al MAIN PRINTED CIRCUIT BOARD

C1 C2 C20 C35 C40, 41 C44 C60 C61 C70 C71 C72, 73 C90

CR1-7,20,

21,35-37 Diode, Si. 200mA 200prv CR40 CR41,43,44 Diode, Si 200mA 200prv CR42,51,52 CR45-50,

53,54 Diode, Si. CR60-62,

70-84,88,

90-93 Diode, Si. 200mA 200prv

Q20, 40

Q41, 42

Q60

Q61-Q63

Q70, 71

Q72, 73 Q90 Q91, 92

R20

R21

R22

R23

R24

R25

R26

R27

R28, 29

R30

R31

R35, 36

R37

R40

Printed Circuit Board, Main

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

Stabistor 1

NOT ASSIGNED

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.

fkd, met. film 1M Ω ±1% ¼ Ω 1

fxd, comp 160 Ω ±5% ½ Ω

fxd, comp (selected) +5% ½ Ω

fxd, ww 680 Ω ±5%5W

fxd, ww 600Ω ±5%5W

fxd, ww 1K

fxd, met. film 330 Ω ±1% 1/8W

fxd, met. film 200k Ω ±1% 1/8W

fxd, met. film 196 Ω ±1% 1/8W

fxd, met. film 1.21k Ω ±1% 1/8W

fxd. met. film 7.5K Ω ±1% 1/8W

fxd, met. film 5.49K

fxd, met. film 21.5K Ω ±1% 1/8W 1

fkd, comp 3.9M Ω ±5%½W

fxd, comp 3.3

fxd, comp (Selected) ±5%½W

fxd, ww 2.6K

fxd, compp 10k Ω ±5%½W 2

fxd, comp 180k Ω ±5%½W 1

fxd, comp 1.5K

DESCRIPTION

Ω

± 5% 3W

Ω

±1% 1/8W

Ω

±5%½W

Ω

±5% 3W

Ω

±5%½W

MFR. PART NO.

1 1

30D505G050BB2

3 2

150D686X0015R2 56285

30 D206G050C02

192P22392 56289 1 1

150D475X9035B2 56289 1 1

150D105X9035A2 56289

192P10492

30D505G050BB2 56289

192P10492 56289

- 8

1N5059

6 9

Type CEB T-O 2

EB-1615 2

Type EB (obd)

243E6815 56289

243E6015 56289

1 1

242E1025 56289

Type CEA T-0 1

Type CEA T-0 2

Type CEA T-0 3

Type CEA T-0

Type CEA T-0 1

EB-3955 2

EB-0335

Type EB (obd) 1

242E2625 EB-1035 EB-1845

EB-1525

MFR.

CODE

28480 28480

56289 56289 28480 28480

56289

28480 28480 28480

03508

28480

28480 28480 28480 28480 28480 28480 28480 28480 1853-009-9

09182

07716 01121 01121

07716 07716 07716 07716

07716 077,16 07716

01121

56289

01121

PART NO.

5060-6189 0160-0161

0180-0301 0180-1835 0180-0049 0160-0162 1 0180-1860 1 0180-0100 1 0180-0332 0180-0291 0160-0168

.0180-0301

0160-0168

1901-0033 1901-0460 1901-0033

1901-0327

1901-0033 1853-0099

1854-0071 1853-0099 1853-0041 1854-0071 1853-0099 1854-0071

1854-0071

0757-0344 0686-1615

0811-2099 0811-1869 1 0813-0001 0698-5663 0757-0472 0698-3440 1 0757-0274 1 0757-0440 0698-3382 1 0698-3430 1 0686-3955 0686-0335

0811-1808 0686-1035

0686-1845

0686-1525

1 1 1 1

1 1 1

6 6

1 1 1 1

1 1 1

1 1

1 1 1 1

62690

6-5

TM11-6625-2958-14&P

REF.

DESIG.

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

fxd, comp 510 Ω ±5% ½W fxd, met. film 560 Ω ±1% ¼W fxd, ww 50 Ω ±5% 5W fxd, met. oxide 22 Ω ±5% 2W 1 fxd, comp 820 Ω ±5% ½W

fxd, comp 1K Ω ±5% ½W var. ww 5k Ω ±10%, Equalizer Adj.

fxd, comp 5.1k Ω ±5% ½W fxd, comp 47 Ω ±5% ½W fxd, comp 39

fxd, comp 1k Ω ±5% ½W

fxd, met. film 61.9k Ω ±1% 1/8W fxd, comp 560 Ω ±5% ½W

fxd, ww 50 Ω ±5% 5W fxd, comp 75

fxd, ww 3.9 Ω 2W

fxd, ww 400 Ω ±5% 10W 1 fxd, met. film 600 Ω ±1% 1/8W 1 Type CEA T-O fxd, met. film 7.5K Ω ±1% 1/8W fxd, met. oxide 180 Ω ±5% 2W 1 fxd, met. film 499 Ω ±1% ¼W 1 Type CEB T-O fxd, met. film 2k Ω ±1% ¼W 1 Type CEB T-O fxd, comp I00kW ±5% ½W 2 fxd, comp 200k Ω ±5% ½W 3 fxd, comp 33k Ω ±5% ½W fxd, met. film 5.49k Ω ±1% 1/8W Type CEA T-O fxd, met. film 7.5k Ω ±1% 1/8W Type CEA T-O fxd, met. film 3.4k Ω ±1% 1/8W

R70 var, ww 5k R71 R72 R73 R74 R75, 76 R77 R78 R79 R80 R81 R82 R83 R84 R85 R86 R87 R88

R90 fxd, met. oxide 820 Ω ±5% 2W

R91

R92 R93 R94 R95 R96

R97 R98 R99

R101

R102

fxd, met. film 12k Ω ±1% 1/8W 1

fxd, met. film 45k Ω ±1% 1/8W 1 fxd, comp 12k Ω ±5% ½W

fxd, comp 82k Ω ±5% ½W fxd, met. film 4,75k Ω ±1% 1/8W fxd, comp 430k Ω ±5% ½W fxd, met. film 249k Ω ±1% 1/8W fxd, comp 3.9k Ω ±5% ½W fxd, met. film 4.32k Ω ±1% 1/8W fxd, comp 4.7 Ω ±5% ½W fxd, comp 9.1k Ω ±5% ½W

fxd, comp 27 Ω ±5% ½W

fxd, comp 100k Ω ±5% ½W fxd, comp 9.1k Ω ±5% ½W fxd, met. oxide 270 Ω ±5% 2W fxd, met. oxide 1.5k Ω ±5% 2W fxd, comp 10 Ω ±5% ½W

fxd, comp 180 Ω ±5% 1W fxd, ww 220 Ω 2W fxd, comp 3.9k Ω ±5% ½W fxd, comp 510 fxd, met. film 1.5k Ω ±1% 1/8W fxd, comp 200k Ω ±5% ½W fxd, comp 4.7 Ω ±5% ½W fxd, comp 10 Ω ±5% ½W fxd, comp 200k Ω ±5% ½W var. ww 250 Ω ±10%, Ammeter Adj. fxd, met. film 909 Ω ±1% 1/8W

DESCRIPTION

Ω

±5% ½W

Ω

±5% ½W

Ω ±10%, Ramp Adjust.

Ω

±5% ½W

MFR. PART NO.

EB-5115

Type CEB T-O

243E5005

Type C42S

EB-8215

EB-1025

2 Type 110-F4

EB-5125

1 1

EB-4705

EB-3905

EB-1025 1 Type CEA T-O 1

EB-5615

243 E5005

EB-7505

Type BWH

Type 10XM

Type CEA T-O

Type C42S

EB-1045

EB-2045 1

EB-3335

Type CEA T-O

Type 110-F4

Type CEA T-O

Type CEA T-O 1

EB-1235 1

EB-8235 2 Type CEA T-O 1

EB-4345 1 Type CEA T-O

EB-3925

2 1 Type CEA T-O 2

EB-47G5 2

EB-9125 1

EB-2705 EB-1045 EB-9125 Type C42S

1 1

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

2 Type 110-F4 1 Type CEA T-O

MFR.

CODE

01121 07716 56289 16299

01121 01121 11236 01121 01121 01121 01121 07716 01121 56289 01121 07716 63743 07716 07716 16299 07716 07716 01121 01121 01121 07716 07716 07716 11236 07716 07716 01121 01121 07716 01121 07716 01121 07716 01121 01121

01121 01121 01121 16299

16299 01121 16299 01121 07716 01121 01121 07716 01121 01121 01121 01121 11236 07716

PART NO.

0686-5115 1 0698-5146 1 0811-1854 1 0698-3609 1 0686-8215 1 0686-1025 1 2100-1824 1 0686-5125 0686-4705 1 0686-3905

0686-1025

0757-0460 1

0686-5615 1

0811-1854

0686-7505 1 0811-1673 1 0811-0942 1 0757-1100 0757-0440 0698-3626 1 0698-3207 1 0757-0739 1

0686-1045 1 0686-2045 0686-3335 1 0698-3382

0757-0440

0698-4440 1 2100-1824 0698-5088 1

0698-5091 1

0686-1235 0686-8235 1 0757-0437 1

0686-4345 1

0757-0270 1

0686-3925 1

0757-0436 1

0698-0001

0686-9125 1

0686-2705

0686-1045

0686-9125

0698-3629 1

0698-3338 1 0686-1005 1 0698-3637 1

0689-1815 1

0811-1763 1

0686-3925

0686-5115

0757-0427 1

0686-2045

0698-0001 0686-1005

0686-2045 2100-0439 1

0757-0422 1

1 1

6269B

6-6

TM 11-6625-2958-14&P

REF.

DESIG.

R103 R104 R105 R106 R108, 109

T70, 90

VR1, 40

VR60, 61

VR90

Z1 22

CR1

L1A/L1B

C3 J1 R120 T2

DESCRIPTION

fxd, met. film 1.5k Ω ±1% 1/8W

fxd, met. film 19.1k Ω ±1% 1/8W fxd, met. film 422 Ω ±1% ¼W var. ww 250 Ω ±10%, Voltmeter Adj.

fxd, comp 100 Ω ±5% ½W

Pulse Transformer

Diode, zener 4.22V ±5% 2

Diode, zener 6.2V ±5%

Diode, zener 6.19V ±5%

Dual Differential Amplifier Resistor Network 1

A2 RFI FILTER ASSEMBLY

RFI Filter Assembly 1 fxd, paper .22µF 600Vdc Triac, 40A 400prv Filter Choke 1.5mH fxd, met. oxide 270 Ω ±5% 2W

A3 INTERCONNECTION BOARD

Interconnection Board Assembly fxd, elect. 5000µF 45Vdc P.C. Board Edge Connector fxd, comp 51k Bias Transformer

Ω

±5% ½W

MFR. PART NO.

Type CEA 7-0 1 Type CEA T-O 1 Type CEB T-O

Type 110-F4

EB-1015

1 1

CA3026

Type 160P 56289

2N5445

1 1 1

Type C42S

1 1 64-718-22 1

EB-5135

MFR.

CODE 07716

07716 07716 11236 01121

28480 28480 1902-.3070

28480 28480

02735

28480

02735 28480 16299

28480 28480 76530 01121 28480

PART NO.

0757-0427 0698-4484 1 0698-4590 1 2100-0439 0686-1015

5080-7122 1

1902-1221 1902-0049

1820-0240 1 1810-0042 1

06269-60007

0160-2461 1884-0080 5080-7146 1 0698-3629 1

5060-7906 0180-1919

1251-1887

0686-5135

9100-26O7

2 2 1

1 1

C1-C4 C5

CR101, 102 CR103, 104 CR1O5 CR106 CR108 CR110

Q101 Q102 Q103-Q108

R106 R123

R150-R155

A4 HEAT SINK ASSEMBLY

Heat Sink Assembly Fan

fxd, ceramic .05µF 400V

fxd, elect. 15µF 50V Rect. Si. 40A 50prv

Rect. Si. 40A 50prv Rect. Si. 40A 50prv Rect. Si. 40A 50prv Rect. Si. 40A 50prv

SCR 35A 4ooprv

Power PNP Si. Power NPN Si. Power NPN Si.

fxd, ww .125 Ω ±5% 5W fxd, cupron 0.01 Ω 20ppm, Cur-

rent Sampling

Emitter Resistor Assembly

fxd, wire helix O.1

Emitter Resistor Assembly

Ω ±5% - Part of

WS2107F

4 1

1N1183AR 02577 1N1183A 02577

1N1183AR 02577 1N1183A 1N1183AR 28480

1 1

28480 97702 28480

28480

02577 28480

28480 28480 28480

28480 28480

28480

06269-60004

3160-0056 0150-0052 1

0180-1834 1 1901-0316

1901-0315 1901-0316 1901-0315 1901-0316 1884-0058

1853-0063 1854-022S 1854-0458

0811-1846 1

5080-7144 1

06260-60023 1

0811-2545

1 1

1 6

6269B

6-7

TM 11-6625-2958-14&P

REF.

DESIG.

TS101

CB1 DS1

DS2

Ml M2

R121 R122 R123 R124

R125

DESCRIPTION

Thermal Switch, open 230°F, close

200°F

A5 FRONT PANEL ASSEMBLY

Front Panel Assembly Circuit Breaker, 25A @ 250Vac max. 1 Indicator Light, Neon, Red

Overvoltage Indicator, 6V, Amber

Voltmeter, 0-50V Ammeter, 0-60A 1

var. ww 10k Ω ±5%, Voltage

Control, Coarse

var. ww 50 Ω ±5%, Voltage

Control, Fine 2

var. ww 200 Ω ±5%, Current

Control, Coarse

var.

ww 10

Control, Fine 1

var. ww 10k Ω ±5%, Overvoltage

Adjustment

Ω ±5%, Current

MFR. PART NO.

AM33 Curve 5

599-124

1 MCL-A3-1730 1

MFR. HP

CODE

28480

28480 74193 72765

07137 28480

28480 1120-1181

28480 28480 28480 28480 28480

PART NO.

0440-0079 1

06269-60005

2110-0213 1 1450-0048 1

1450-0305 1 1120-1173 1

2100-1854 1 2100-1858 1 2100-1856 1 2100-1857 1 2100-1854

CHASSIS - ELECTRICAL

C19 C101-C104 fxd, elect. 50,000µF 50Vdc 4 C110, 111

Fan

fxd, elect. 15µF 50Vdc fxd, ceramic .01µF 300Vdc

Power Transformer

CHASSIS ASSEMBLY- MECHANICAL Chassis Assembly (Welded) 1

Bracket, RFI Filter Mounting 2 Standoff, Insulated, RFI Filter

Mounting 4

Grommet, 5/8” (Internal

Chassis Divider) 1 Cover 2 Chassis, Internal, Ckt. Board Tray 1 Chassis, Internal, Capacitor Tray 1

Bus Bar, C101-C102 Bus Bar, C103-C104 Clamp, C101-C104 3 Bracket, Fan B2

Rear Panel (Blank, with labeling) 1

Cover, AC Input Barrier Block 1 Cover, Rear Control Barrier Strip Bus Bar, Output Barrier Block, AC Input Rubber Bumper Spacer, Insulated, AC Input

Barrier (2), Output Bus Bars (4)

Serial I.D. Plate 1

8500

150D156X0050R2

41C21A5

1661

2 2

1 2 1 603-3 4 2097-W

23936 56289

28480 56289

28480

28480 28480

28480 73734

28480 28480 28480

28480 28480 28480 28480

28480 28480 28480 28480 75382 87585

28480 28480

3160-0056 1 0180-1834 1

0180-2346 1 0160-2568 1

06269-80091 1

5060-6186 5000-6257

0380-0902 0400-0062

5000-6250 5000-6248

06269-00002

5000-6251 5000-6253 5000-6017

06269-00003 06260-60008

5000-6249

00712-20001

5000-6252

0360-1596 1

0403-0089 0380-0710 6

7120-1111

6269B

6-8

TM 11-6625-2958-14&P

REF.

DESIG.

DESCRIPTION

Shoulder Washer, Bus Bar Binding Post, 5 Way, N. P. Brass

(Ground)

Al - MECHANICAL

Barrier Strip, Rear Control

Jumper, Barrier Strip

A2 - MECHANICAL

Heat Sink, RFI Filter Ass’y. (CRl) 1 Cover, RFI Assembly

Terminal, Insulated, Cl 1

Wafer, Insulated, CR1 1

Shoulder Washer, CR1 Hole Plug, Heat Sink, 7/8” dia.

A3-MECHANICAL

Clamp, Capacitor, C3 1

A4 -MECHANICAL

Heat Sink, Q103-104-107-108,

Q105-106 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 4 Rubber Bumper, Heat Sink Protection 1 Insulator, Mica, Q101-102 Shoulder Washer, Q101-102 Insulator, Transistor Pins, Q101-110

Insulator, Mica, CR109 Shoulder Washer, CR109 Shoulder Washer, Heat Sink Bracket

Mounting

MFR. PART NO.

137

1 4

422-13-11-013

1 1

2 2 1 1 1 1 2

8203-PH0632 734

2 4

1 1

MFR.

CODE 28480

83330

28480 71785

28480 28480 28480 28480 28480 28480

28480

28480 28480 28480 28480 28480 28480 28480 28480

‘ 06540

28480 08530 28480 28480 28480 28480

28480

PART NO. 2190-0491 1510-0044

0360-1518 0360-1143

5020-5785 5020-5768 0360-1449 0340-0175 2190-0898 6960-0047

1400-0472

5020-5763 5020-5769 5020-5766 5020-5765 5000-6256 5000-6255 5020-5787 3050-0455

0380-0879 0403-0002 0340-0174 2190-0490 0340-0166 2190-0709 2190-0898

3050-0483

1 2

3 1

2 4 8

1 1

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

6269B

6-9

1 4 2

C17373-012-248 1 1 4 2 8 2

28480 28480 89032 28480 28480 28480 28480 28480 28480

28480

5000-6254 0370-0137 0510-0123 1410-0052 2950-0034 0590-0013 4040-0296 1460-0256 5020-5762

2680-0173

1 1

TM 11-6625-2958-14&P

REF.

DESIG.

R82

Manual Carton, Packing Floater Pad, Packing

fxd, comp 240 Ω ±5% ½W Label, Identification

10-Turn Voltage Coarse Control

DESCRIPTION

MISCELLANEOUS

OPTION 005

50Hz Operation

OPTION 007

1 1

MFR. PART NO.

EB-2415

MRF. CODE

28480 06269-90002 28480

28480

01121

PART NO.

9211-1181 9220-1402

0686-2415 7124-1719

A5R121

A5R123

A5R121 A5R123

A5R121

R30

A5R123

var. ww 10k Ω ±5% 10-Turn

10-Turn Current Coarse Control

var. ww 200 Ω ±5% 10-Turn

10-Turn Voltage & Current Controls

var. ww 10k Ω ±5% 10-Turn var. ww 200

Slides, Chassis

Decadial Voltage Control

fxd, comp (Selected) ±5% ½W var. ww 10k

Decadial Control

Decadial Current Control

fxd, comp (Selected) ±5% ½W var. ww 200

Decadial Control

OPTION 008

OPTION 009

Ω ±5% 10-Turn

OPTION 010

Chassis Slides

OPTION 013

Ω ±5% 10-Turn

OPTION 014

Ω ±5% 10-Turn

1 I

1 1

1 CTS 120 E6

Type EB (obd) 1 1 RD-411

Type EB (obd)

RD-411

28480

01121 28480 07716

2100-1866

2100-1863

2100-1866 2100-1863

2100-1866 1140-0020

2100-1863 1140-0020

1 1

R111 R112,113 R114

R115 R116 R118 R119

Voltage Programming Adjust

fxd, met. film 221k var. ww 5k fxd, met. film 249k Ω ±1% 1/8W

Label, Identification

Current Programming Adjust

fxd, met. film 23K

var. ww 5k fxd, met. film 200k Ω ±1% 1/8W var. ww 5k Label, Identification

OPTION 020

Ω ±1% 1/8W

Ω

OPTION 021

Ω ±1% 1\8W

Ω Ω

6269B

6-10

Type CEA T-O 2 1

Type CEA T-O 1

Type CEA T-O 2

Type CEA T-O

07716 28480 07716

28480

0757-0473 2100-0806 0757-0270 7124-1721

0698-3269 2100-0806 0757-0472 2100-0806 7124-1721

1 1 1

TM 11-6625-2958-14&P

REF DESCRIPTION TQ MFR HP RS

DESIGN MFR PART NO CODE PART NO

OPTION 022

VOLTAGE & CURRENT PROGRAMMING ADJUST

R111 FXD, MET. FILM 221KW ±1% 1/8W 1 TYPE CEA T-O 07716 0757-0473 1

R112,113 VAR. WW 5K

Ω

4 28480 2100-0806 1

R114 FXD, MET. FILM 249KW ±1% 1/8W 1 TYPE CEA T-O 07716 0757-0270 1

R115 FXD, MET. FILM 23KW ±1% 1/8W 1 TYPE CEA T-O 07716 0698-3269 1

R116 VAR. WW 5K

Ω

28480 2100-0806

R118 FXD, MET. FILM 200KW ±1% 1/8W 1 TYPE CEA T-O 07716 0757-0472 1

R119 VAR. WW 5KW 28480 2100-0806

LABEL, IDENTIFICATION 1 28480 7124-1721

OPTION 027

208VAC INPUT

LABEL, IDENTIFICATION 1 28480 7124-1717

6269B

6-11

TM11-6625-2958-14&P TABLE 6-5. PART NUMBER - NATIONAL STOCK NUMBER

CROSS REFERENCE INDEX

NATIONAL NATIONAL

PART STOCK PART STOCK

NUMBER FSCM NUMBER NUMBER FSCM NUMBER

0150-0052 28480 5910-00-797-4909 0757-0437 28480 5905-00-904-4404

0160-0161 28480 5910-00-911-9271 0757-0440 28480 5905-00-858-6795

0160-0162 28480 5910-00-850-2162 0757-0460 28480 5905-00-858-8959

0160-0168 28480 5910-00-917-0668 0757-0472 28480 5905-00-257-9210

0180-0049 28480 5910-00-781-9398 0757-0473 28480 5905-00-994-8480

0180-0100 28480 5910-00-752-4172 0757-0739 28480 5905-00-830-6078

0180-0291 28480 5910-00-931-7055 0757-1100 28480 5905-00-917-0586

0180-0332 28480 5910-00-943-6709 0813-0001 28480 5905-00-932-0413

0180-1860 28480 5910-00-931-7061 1N5059 03508 5961-00-088-8792

0686-1035 28480 5905-00-451-0540 1140-0020 28480 5355-00-584-0840

0686-1045 28480 5905-00-195-6761 1251-1887 28480 5935-00-147-7384

0686-1525 28480 5905-00-279-1757 137 83330 5940-00-321-4984

0686-3335 28480 5905-00-997-5436 1410-0052 28480 5895-00-061-2906

0686-4345 28480 5905-00-279-2518 1450-0048 28480 6210-00-761-8898

0686-5125 28480 5905-00-279-2019 150D105X9035A2 56289 5910-00-104-0144

0689-1815 28480 5905-00-403-9066 150D475X9035B2 56289 5910-00-177-4300

0698-0001 28480 5905-00-682-4247 1661 73734 5325-00-301-8656

0698-3338 28480 5905-00-431-6842 1810-0042 28480 5905-00-450-0107

0698-3430 28480 5905-00-420-7136 1853-0041 28480 5961-00-931-8259

0698-3440 28480 5905-00-828-0377 1853-0063 28480 5961-00-867-9319

0698-3629 28480 5905-00-405-3727 1853-0099 28480 5961-00-450-4689

0698-4440 28480 5905-00-431-6840 1854-0071 28480 5961-00-137-4608

0698-4484 28480 5905-00-140-5675 1854-0225 28480 5961-00-072-0094

0698-5088 28480 5905-00-469-2838 1901-0033 28480 5961-00-821-0710

0698-5146 28480 5905-00-431-6837 1901-0327 28480 5961-00-931-0213

0757-0270 28480 5905-00-491-4596 1901-0460 28480 5961-00-867-9206

0757-0274 28480 5905-00-858-9105 1902-0049 28480 5961-00-911-9277

0757-0344 28480 5905-00-269-2629 1902-3070 28480 5961-00-931-6989

0757-0422 28480 5905-00-728-9980 192P10492 56289 5910-00-728-8472

0757-0427 28480 5905-00-917-0578 192P22392 56289 5910-00-993-8308

0757-0436 28480 5905-00-858-6792 2100-0439 28480 5905-00-851-3924

6-12

PART NUMBER - NATIONAL STOCK NUMBER TM 11-6625-2958-14&P

CROSS REFERENCE INDEX

NATIONAL NATIONAL

PART STOCK PART STOCK

NUMBER FSCM NUMBER NUMBER FSCM NUMBER

2100-0806 28480 5905-00-929-0485

2100-1824 28480 5905-00-892-9626

2100-1857 28480 5905-00-575-8853

2100-1866 28480 5905-00-110-0282

242E1025 56289 5905-00-504-4892

243E5005 56289 5905-00-950-5551

2950-0034 28480 5310-00-903-8729

30D505G050BB2 56289 5910-00-081-6159

3160-0056 28480 4140-00-758-6113

422-13-11-013 71785 5935-00-917-9079

599-124 72765 6210-00-761-8898

734 08530 5970-00-840-5109

6-13

TM 11-6625-2958-14&P

SECTION Vll

CIRCUIT DIAGRAMS AND COMPONENT LOCATION DIAGRAMS

This section contains the circuit diagrams necessary for the operation and maintenance of this power supply. Included are:

Component location diagrams (Figures 7-1 through 7-8, and 7-10), showing the physical location and reference designators of parts mounted on the printed circuit boards and chassis.

b. Preregulator control circuit waveforms

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

ous points in the preregulator control circuit.

Schematic diagram (Figure 7-1 1), illustrating the circuitry for the entire power supply. Voltages are given adjacent to test points, which are identified by encircled numbers on the schematic.

7-1

TM 11-6625-2958-14&P

Figure 7-1.

(Shown removed from supply with assembly cover off.)

A2 RFI Assembly Component Location Diagram

Figure 7-2. A3 Interconnection Circuit Board Assembly Component

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

7-2

TM 11-6625-2958-14&P

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

7-3

TM 11-6625-2958-14&P

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

7-4

TM 11-6625-2958-14&P

Figure 7-5. Bottom Rear Chassis Assembly

Component Location Diagram

7-5

TM 11-6625-2958-14&P

Figure 7-6. Series Regulator Emitter Resistor

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

Assembly Component Location Diagram

Figure 7-7.

A4 Heat Sink Assembly Component Location Diagram

(Top view, assembly removed from supply.)

7-6

TM 11-6625-2958-14&P

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.

A4 Heat Sink Assembly Component Location Diagram

(End view, assembly removed from supply.)

Figure 7-9. Preregulator Control Circuit Waveforms

7-7

Figure 7-10

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

NOT DIGITIZED

APPENDIX A REFERENCES

TM 11-6625-2958-14&P

DA Pam 310-4

DA Pam 310-7 TM 38-750 TM 740-90-1 TM ‘750-244-2

TB 43-180

TB 385-4

Index of Technical Manuals, Technical Bulletins,

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

Bulletins, and Lubrication Orders. Index of Modification Work Orders.

The Army Maintenance Management System (TAMMS). Administrative Storage of Equipment. Procedures for Destruction of Electronics Materiel

to Prevent Enemy Use (Electronics Command).

Calibration Requirements for the Maintenance of

Army Materiel. Safety Precautions for Maintenance of Electrical/

Electronic Equipment.

A-1

APPENDIX B

COMPONENTS OF END ITEM LIST

TM 11-6625-2958-14&P

Section L

B-1.

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-2. General

This Components of End Item List is divided into the following sections:

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

bled, comprise the PP-754.5/U and must accompany it whenever it is transferred or turned in.

The illustrations will help you identify these items.

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 authorization of the end item.

B-3. Explanation of Columns

lows :

ber of the illustration on which the item is shown.

Scope

a. Section II. Integral Components of the End

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

a. Illustration. This column is divided as fol-

(1) Figure number. Indicates the figure num-

INTRODUCTION

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

tify item called out in the illustration.

b. National Stock Number. Indicates the National 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 identify the item. The part number indicates the primary number used by the manufacturer, which controls the design and characteristics of the item by means of its. engineering drawings, specifications, 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

d. Location The physical location of each item listed is given in this column. The lists are designed 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.

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.

(Next printed page is B-2.)

B-1

SECTION II INTEGRAL COMPONENTS OF END ITEM TM 11-6625-2958-14&P

SECTION III BASIC ISSUE ITEMS

(1) (2) (3) (4) (5) (6) (7)

ILLUSTRATION NATIONAL DESCRIPTION LOCATION USABLE QTY QUANTITY

(A) (B) STOCK ON REQD

FIG ITEM NUMBER CODE RCVD DATE

NO NO PART NUMBER (FSCM)

1-1 N/A 6130-00-148-1796 PP-7545/U 28480 1

TM 11-6625-2958-14&P 1

B-2

APPENDIX D

MAINTENANCE ALLOCATION

Section L INTRODUCTION

TM 11-6625-2958-14&P

D-1. General

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 operations.

D-2. Maintenance Function

Maintenance functions will be limited to and defined as follows:

a. Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/ or electrical characteristics with established standards through examination.

b. Test. To verify serviceability and to detect incipient failure by measuring the mechanical or

electrical characteristics of an item and comparing those characteristics with prescribed standards.

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.

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

in precision measurement. Consists of comparisons 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.

g. install. The act of emplacing, seating, or fixing into position an item, part, module (component 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.

i. Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate, replace) or other maintenance actions (welding, grinding, riveting, straightening, facing, remachining, 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.

j. Overhaul. That maintenance effort (service/ action) necessary to restore an item to a completely serviceable/operational condition as prescribed by maintenance standards (i.e., DMWR) in appropriate 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.

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.

D-1

TM 11-6625-2958-14&P

D-3. Column Entries

u. Column 1, Group Number. Column 1 lists group numbers, the purpose of which is to identify components, assemblies, subassemblies, and modules with the next higher assembly.

b. Column 2, Component/Assembly. Column 2 contains the noun names of components, assemblies, subassemblies, and modules for which maintenance is authorized.

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. 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 active 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, troubleshooting 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:

C - Operator/Crew 0- Organizational F - Direct Support H - General Support D - Depot

e. Column 5, Tools and Equipment. Column 5

specifies by code, those common tool sets (not

individual tools) and special tools, test, and support equipment required to perform the designated function.

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.

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.

b. Maintenance Category. The codes in this column indicate the maintenance category allocated 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 manufacturer’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.

b. Remarks. This column provides the required explanatory information necessary to clarify items appearing in section II.

D-2

SECTION II MAINTENANCE ALLOCATION C

HART

TM 11-6625-2958-14&P

D-3

TM11-6625-2958-14&P SECTION III TOOL AND TEST EQUIPMENT REQUIREMENTS

FOR

POWER SUPPLY PP-7545/U

TOOL OR TEST

EQUIPMENT MAINTENANCE NOMENCLATURE NATIONAL/NATO TOOL NUMBER

REF CODE CATEGORY STOCK NUMBER

1 O MULTIMETER AN/URM-105 6625-00-581-2036

2 O TOOL KIT, ELECTRONIC EQUIPMENT TK-101/G 5180-00-064-5178

3 H, D TOOL KIT, ELECTRONIC EQUIPMENT TK-105/G 5180-00-610-8177

4 H, D GENERATOR, SIGNAL SG-321/U 6625-00-880-5791

5 H, D MULTIMETER, AN/USM-223/U 6625-00-999-7465

6 H, D MULTIMETER, ELECTRONIC, ME-260/U 6625-00-913-9781

7 H, D OSCILLOSCOPE AN/USM-281 6625 00-106-9622

8 H, D RESISTANCE BRIDGE, ZM-4()/U 6625-00-500-9370

9 H, D TRANSFORMER, VARIABLE CN-16/U 5950-00-235-2086

10 H, D VOLTMETER DIGITAL, AN/GSM-64 6625-00-022-7894

11 H, D VOLTMETER DIGITAL, ME-202/U 6625-00-709-0288

D-4

REFERENCE

CODE

SECTION IV. POWER SUPPLY PP-7545/U

REMARKS

TM 11-6625-2958-14&P

A B

Exterior Operational Interior

All

D-5

Figure 7-11. Schematic Diagram, Model 6269B

MANUAL CHANGES

Model 6269B DC Power Supply

Manual HP Part No. 06269-90002

Make all corrections in the manual according to errata below, then check the following table for your power

supply serial number and enter any listed” change(s) in the manual.

In the Replaceable Parts list under AZ RFI Filter

SERIAL

Prefix

Number

ALL

1027A

0245, 0246, 0255

1027A

0236, 0239, 0241 - 0244, 0247, 0248, 0252 -0254, 0256-0305

1027A

1027A 1027A

1027A 1436A 1506A 1513A

1535A

0306 - 0355 0356 - 0380

0381 - 0429 0430 - 0455 0456 - 0540

0541

- 0870

0871

- 1080

1081

- 1260

1261

- 1470

1471

- 1510

1511

- 1630

1631

- up ERRATA:.

In the Replaceable Parts List, make the following

changes:

Knob, front panel, black: Change to HP Part No.

0370-0084.

Option 007: Add knob, HP Part No. 0370-0137,

quantity 1.

Option 008: Add knob, HP Part No. 0370-0137,

MAKE

CHANGES

Errata

1 1,2

1,2,3

1,2, 3,4 1 thru S

1 thru 6 1 thru 7

1 thru 8 1 thru 9 1 thru10 1 thru 11 1 thru 12 1 thru 13 1 thru 14

Assembly:

C2: Add, 0.047µF, 600V, HP Part No. 0160-0005. R2: Add, 220

Ω, ±5%, 2W, HP Part No. 0811-1763.

In the Replaceable Parts Iist, make the following

changes:

CR1: Delete Mfr. Part No. and change HP Part

No. to 1884-0209.

Under A2-Mechanical:

Wafer, Insulated, CR1: Delete. Shoulder Washer, CR1: Delete.

CHANGE 2:

In the Replaceable Parts List under A4 Heat Sink

Assembly and on the Schematic, make the follow-

ing changes:

A4R106 (in the Overvoltage Protection Crowbar):

Change to fxd,

WW, 0.2 Ω, 12W, HP Part No.

0811-3081.

A4Q102 (in the Series Regulator and Driver Cir-

cuit): change to HP Part No. 1854-0458.

CHANGE 3:

In the Replaceable Parts list, make the following changes:

A1C71: Change to 0.22µF, 80V, HP Part No.

0160-2453.

A1R5: Change to 680 Ω, 5W, HP Part No.

0811-2099.

A1R79: Change to 1.8k, ½W, HP Part No.

0686-1825.

quantity 1.

Option 009: Add knob, HP Part No. 0370-0137,

ERRATA :

quantity 2.

Under AS-Mechanical:

Bezel, Gray Plastic: Change to HP Part No.

4040-0293 (Black).

Under Chassis Assembly-Mechanical

Bus Bar, C103-C104: Change to HP Part No.

5000-6251.

In the Replaceable Parts List on Page 6-8, under Chassis-Electrical, change:

C110, C111 to 3000 Vdc. On the schematic, Figure 7-11, connect the +S output terminal to the A8 terminal on the inboard side of the + OUT BUS (these terminals are inter-

nally connected).

CHANGE 1:

Add new RC network (C2 and R2) on the RFI filter

board assembly A2.

On the schematic, C2 and R2 are connected directly across Triac CR1 (C2 is on the inboard side of CR1).

C2 and R2 prevent the misfiring (turning on too

soon) of triac CR1 by slowing the rate of voltage increase across L1A/B (in series with T1) when

the triac turns off.

CHANGE 4:

In the Replaceable Parts List and on the schematic make the following changes:

A2C1: Change Cl to O.1µF, 400Vdc, HP Part No.

0160-0013.

A1C41: Change C41 to 0.01µF, 200Vdc, HP Part

No. 0160-0161.

Manual Changes/Model 6269B Manual HP Part No, 06269-90002 Page -2-

CHANGE 5:

The standard colors for this instrument are now mint gray (for front and rear panels) and olive, gray

(for all top, bottom, side, and other external sur-

faces). color scheme of light gray and blue gray. Option A85 designates use of a light gray front panel with

olive gray used for all other external surfaces.

New part numbers are shown below:

In the replaceable parts table under AI Main P. C.

Board - Electrical and on the schematic (in the Overvoltage Protection Crowbar circuit), make the following changes:

C91: Add, 0.0047µF, 200V, HP Part No. 0160R99: Change to 10k Ω, ±5%, ½W, HP Part No.

T70, T90: Change to HP Part No. 5080-7192.

Option X95 designates use of the former

DESCRIPTION

Front Panel, Complete

Front Panel, Lettered Rear Panel 5000-9475 Cover, Top and Bottom Chassis, Assembly

(weIded)

CHANGE 7:

0157.

0686-1035.

STANDARD

06269-60005

06269-60009

5000-9476

5060-7972

CHANGE 6:

In the Replaceable Parts list and on the schematic, make the following changes:

A1R24: Change to 127k

No. 0698-6659.

A1R25: Change to 90.9k

No. 0757-0464.

These changes insure that the Short Circuit Protection circuit operates correctly.

HP PART NO.

OPTION A85

06269-60006

with the secondary winding of the new Pulse Generator Pulse Transformer T70 (HP Part No. 5080-7192) as shown below:

Ω, ±25%, 1/8W, HP Part

Ω, ±1%, 1/8W, HP Part

OPTION X95

5000-6247 5000-6250

5060-6186

The above changes have been made to improve the noise immunity of the overvoltage protection crowbar and thereby eliminate spurious triggering of the crowbar. the collector of Q92 (which also connects to the base of Q91) and

disconnected fmm +12.4V and connected instead to

the junction of R94-R95 (the other end of R95 still connects to the base of Q92 through CR91).

In order to eliminate false triggering and ripple im-

balance in the Preregulator Control Circuit, the

following changes have been made:

Diode CR88 and resistor R88 are now in series

In the replaceable parts table under A2 RFI Filter

Assembly, change Triac CR1 HP Part No. to 1884-

0218.

Capacitor C91 is connected from between

The top of R99 has been

CHANGE 8:

Manual Changes/Model 6269B Manual HP Part No. 04269-90002 Page -3-

ERRATA :

In the parts list

Under A4 Mechanical, add Transistor Insu-

lator, HP Part No. 0340-0795, quantity 2.

Under AS Front Panel Assembly, change the

HP Part No. of circuit breaker CB1 to 3105-0034.

CHANGE 12:

The following changes enable the master crowbar

to trip the slave crowbar(s) when two or more units are connected in parallel. under Al Main Printed Circuit Board and on the schematic, change A1C90 to .47µF 25Vdc HP Part No. 0160-0174. Also, add resistor A1R120, 4.7K

¼W HP Part No. 0758-0005. Connect A1R20 in parallel with A1Z2C in the Overvoltage Protection Crowbar Circuit on schematic.

In the parts list

CHANGE 9:

In the parts list under A4 Heat Sink Assembly,

change the HP Part No. of CR101, 102, 105, and

108 to 1901-0318, and change CR103, 104, and 106 to 1901-0317.

CHANGE 10:

In the parts list under AS Front Panel Assembly,

change R122 to 100 ohms, variable, HP Part No.

2100-1987.

CHANGE 11:

In the parts list and on the schematic, make the following additions and changes:

Under AS: Add C112, fxd, .01µF 3KV HP Part

No. 0160-2568

Under A2: Add RV1, varistor, MOV HP Part No.

0837-0117

Change: C110 and C111 have been moved from

chassis to the front panel assembly. Connect the added and changed components as shown below.

The following change prevents series regulator failure under short circuit conditions. On schematic, in the Constant Voltage Comparator Circuit disconnect anode of A1CR6 from A1Z1 pin 1 side of A1R6. Connect anode of A1CR6 to rear terminal A2 side of A1R6.

CHANGE 13:

In the parts list under A4 Heat Sink Assembly. change the part number of CR101 and CR102 to

1901-0729 and change CR103 and CR104 to 1901-

0730.

CHANGE 14:

The RFI Assembly is changed to HP Part No. 06269-

60010. This new RFI Assembly is completely interchangeable in all previously built 6269B power supplies.

In the parts list under A2-Mechanical make the following changes:

Change the Cover, RFI Assembly to 5020-

2284. Change the Heat Sink, RFI Filter Ass ‘y to

5020-2282.

Manual Changes/Model 6269B Manual HP Part No. 06269-90002 Page -4-

In the parts list, delete the entire listing under A2 RFI Filter Assembly and replace with the following.

REF.

DESIG.

C1, C2 C3 C4

CR1

L1 R1, R2 R4 RV1

RFI Filter Assembly fxd, metalized paper, 0.1µF 250Vac

fxd, metalized paper, .047µF 250v fxd mica, 5000pF, 1kV Thyristor, Si. (Triac)

Filter choke, 20A fxd, metal oxide, 1.5k Ω 2W fxd, metal oxide, 220 Ω 2W

Varistor, MOV

DESCRIPTON

A schematic of RFI Filter Assembly 06269-60010 is shown below. This schematic replaces the A2 Filter portion of the schematic shown in Change 11.

PART NO.

06269-60010

0160-4065 0160-4323 0160-0899 1884-0248

5080-1782 0698-3338 0698-3628 0837-0117

9-26-75

By Order of the Secretary of the Army:

Official:

J. C. PENNINGTON

Major General, United States Army

The Adjutant General

Distribution:

Active Army:

TSG (1)

USAARENBD (1) USAINSCOM (2)

TRADOC (2) DARCOM (1) TECOM (2) OS Maj Cored (2)

USACC (2)

HISA (Ft Monmouth) (21)

Armies (1)

USASIGS (10)

Svc Colleges (1) Ft Richardson (CERCOM Oft) (1)

Ft Carson (5)

Ft Gillem (10) WSMR (1)

ARNG; None

USAR: None

For explanation of abbreviations used, see AR 310-50.

E. C. MEYER

General, United States Army

Chief of Staff

USAERDAA (1) USAERDAW (1) Army Dep (1) except

SAAD (20) TOAD (14)

SHAD (2) USA Dep (1) Sig Sec USA Dep (1) Units org under fol TOE:

(2 copies each unit)

29-207 29-610

(1 copy each unit)

29-134

29-136

THE METRIC SYSTEM AND EQUIVALENTS

PIN: 046413-000

HP (Hewlett-Packard) 6269b User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SECTION I

SECTION II

SECTION IV

SECTION V

SECTION VI

Figure 7-10

APPENDIX B

APPENDIX D