HP Hewlett Packard Power Supply 6205B User Manual

TM 11-6625-2965-14&P

TECHNICAL MANUAL

OPERATOR’S ORGANIZATIONAL

DIRECT SUPPORT AND GENERAL SUPPORT

MAINTENANCE MANUAL

[INCLUDING REPAIR PARTS

AND SPECIAL TOOLS LISTS]

POWER SUPPLY PP-7548/ U

(HEWLETT-PACKARD MODEL 6205B]

[NSN 6625-00-437-4861]

HEADQUARTERS, DEPARTMENT OF THE ARMY

25 FEBRUARY 1980

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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.

DO NOT ATTEMPT to make internal connections or perform adjustments

unless another person, capable of performing first aid, is present.

For electric shock protection, use only extension cord and power receptacles

with a safety-ground connector, or otherwise connect the chassis to a safety

ground.

CERTIFICATION

The Hewlett-Packard Company certifies that this instrument was thoroughly

tested and inspected and found to meet its published specifications when it ^Was

shipped from the factory. The Hewlett-Packard Company further certifies that

its calibration measurements are traceable to the U.S. National Bureau of

Standards to the extent allowed by the Bureau’s calibration facility.

WARRANTY AND ASSISTANCE

All Hewlett-Packard products are warranted against defects in materials and

workmanship. This warranty applies for one year from the date of delivery, or,

in the case of certain major components listed in the operating manual, for the

specified period. We will repair or replace products which prove to be

defective during the warranty period. No other warranty is expressed or

implied. We are not liable for consequential damages.

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TM 11- 6625- 2965- 14& P

This manual contains copyright material reproduced by permission of Hewlett-Packard Company

TECHNICAL M A N U A L

HEADQUARTERS

DEPARTMENT OF THE ARMY

W^ASHINGTON,DC, 25 February 1980

No. 11-6625-2965-14&P

O PERATO R’S, O RG ANIZATIO NAL, DIREC T SUPPO RT AND

G ENERAL SUPPO RT MAINTENANC E MANUAL

(INCLUDING REPAIR PARTS AND SPECIAL TOOLS LISTS)

POWER SUPPLY PP-7548/U (HEWLETT-PACKARD MODEL)

(NSN 6625-00-437-4861)

REPORTING OF ERRORS

Y^OUcan 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 the

Commander, US Army Communications and Electronics Materiel Readiness Command, ATTN:

DRSEL-ME-MQ, Fort Monmouth, NJ 07703.

In either case a reply will be furnished direct to you.

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 prepared

in accordance with military specifications, the format has not been structured to consider levels of

maintenance.

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TM 11- 6625- 2965- 14&P

TABLE OF CONTENTS

Section

Page No.

Section

Page No.

3-38 Special Operating Con-

O INSTRUCTIONS . . . . . . . . . . . . . . . . 0-1

siderations

3-6

0-1

0-l Scope

Pulse Loading

Output Capacitance

3-39

3-41

0-2 Indexes of Publications 0-1

0-3 Maintenance Forms,

3-43 Reverse Voltage Loading

3-45 Reverse Current Loading

0-1

Records and Reports

0-4 Reporting Equipment

Improvement Recommen-

dations (EIR)

0-1

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

0-5 Administrative Storage

0-6 Destruction of Army

4-1

4-2

Overall Description

4-8 Detailed Circuit Analysis

4-9 Feedback Loop

4-13 Series Regulator

Electronics Materiel 0-1

4-15 Constant Voltage Comparator 4-2

4-19 Error Amplifier and Driver

4-22 Current Limit Circuit

4-26 Reference Circuit

4-29 Meter Circuit

4-2

4-3

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

1-1

1-2

1-1

Description

1-6 Specifications

1-8 Options

1-10 Accessories

V MAINTENANCE

5-1

1-12 Instrument and Service Man-

ual Identification

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

5-1

Introduction

1-2

5-3 General Measurement

Techniques

5-8 Test Equipment Required

1-15 Ordering Additional Manuals 1-2

5-1

5-2

5-3

5-7

5-9

II INSTALLATION

2-1

2-3

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

2-1 Initia1 Inspection

Performance Test

Constant Voltage Tests

Output Impedance

Troubleshooting

Overa11 Troubleshooting

Procedure

5-10

5-12

5-38

5-48

5-53

2-3 Mechanical Check

2-5 Electrical Check

2-7 Installation Data

2-9

Location

2-11 Outline Diagram

2-13 Rack Mounting

5-9

5-58 Repair and Replacement

5-60 Adjustment and Calibration

5-12

5-13

2-17

2-19

Input Power Requirements

Connections for 230 Volt

Operation

Meter Zero

5-62

2-3

5-64 Ammeter Tracking

2-21 Power Cable

2-24

5-66

Constant Voltage Programming

Current

Repackaging for Shipment

5-13

5-15

5-69 Reference Circuit Adjustments

5-71 Constant Voltage Transient

Recovery Time

I I I OPERATING INSTRUCTIONS . . . . . . . . 3-1

3-1 Turn-on Checkout Procedure

3-1

3-2

5-15

3-3

3-5

3-7

3-9

3-11

Operating Modes

Norma1 Operating Mode

Constant Voltage

Changing Current Limit

Connecting Load

5-73 Current Limit Adjustment

VI REPLACEABLE PARTS . . . . . . . . . . .

6-1 Introduction

. . . .

6-1

6-4 Ordering Information

3-14 Operation Beyond Norma 1

A-1

B-1

References

APPENDIX A

3-2

Rated Output

Optional Operating Modes

Components of End

3-16

Item

3-17 Remote Programming, Con-

stant Voltage

3-25 Remote Sensing

3-30 Series Operation

3-35 Auto-Tracking Operation

Maintenance

Allocation

Manual backdating

Changes

3-2

3-3

3-4

3-5

C- 1

VII CIRCUIT DIAGRAMS

........... 7-1

i i

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TM 11-6625-2965-14&P

LIST OF ILLUSTRATIONS

Page No.

2-1

Figure

4-2

Page No.

4-4

2-1

2-2

2-3

2-4

3-1

3-2

3-3

3-4

3-5

3-6

3-7

3-8

3-9

Outline Diagram

Multiple Range Meter Circuit,

Simplified Schematic

Rack Mounting, Two Units

Rack Mounting, One Unit

Primary Connections

2-2

2-3

5-1

5-2

Front Panel Terminal Connections 5-1

Output Current Measurement

Technique

Differential Voltmeter Substitute,

Test Setup

Output Current, Test Setup

Load Regulation, Test Setup

Front Panel Controls and Indicators 3-1

5-1

5-3

3-1

3-2

Normal Strapping Pattern

Current Limit Alteration

5-2

5-4

5-5

5-6

5-7

5-8

Remote Resistance Programming 3-3

3-3

3-4

Remote Voltage Programming

Remote Sensing

Norma I Series Connections

CV Ripple and Noise, Test Setup 5-5

CV Noise Spike, Test Setup

Transient Recovery Time,

Test Setup

Transient Recovery Time,

Waveforms

5-6

Auto-Series, Two and Three Units 3-4

Auto-Parallel, Two and Three

5-7

5-9

3-5

Units

3-10

4-1

Auto-Tracking, Two and Three

Units

Overa11 Block Diagram

5-7

5-8

5-14

3-5

4-1

5-10

5-11

Output Impedance, Test Setup

Servicing Printed Wiring Boards

LIST OF TABLES

Page No.

1-3

Table

1-1 Specifications

5-1 Test Equipment Required

5-2

5-9

5-2 Reference Circuit Troubleshooting

5-3 Overall Trouble shooting

5-11

5-12

5-4 High Output Voltage Troubleshooting

5-5 Low Output Voltage Troubleshooting

5-6 Selected Semiconductor Characteristics

5-7 Checks and Adjustments After Replacement of Semiconductor Devices 5-12

6-1

6-2

6-5

6-1 Reference Designators

6-2 Description Abbreviations

6-3 Code List of Manufacturers

6-4 Replaceable Parts

i i i

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TM 11-6625-2965-14&P

SECTION O

INSTRUCTIONS

0-1.

SCOPE

This manual applies directly to Power Supply PP-7548/U (Hewlett-Packard

Model 6205) having serial prefix number 7L2301 and up. For serial prefixes

below 7L2301 refer to Appendix E.

inclusion of change page.

For serials above 7L4450 check for

0-2.

INDEXES OF PUBLICATIONS

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

whether there are new editions, changes, or additional publications pertain-

ing to the equipment.

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.

MAINTENANCE FORMS, RECORDS AND REPORTS

Reports of Maintenance and Unsatisfactory Equipment.

Department of

the Army forms and procedures used for equipment maintenance will be those

described by TM 38-750, The Army Maintenance Management System,

Report of Packaging and Handling Deficiencies.

Fill out and forward

DD Form 6 (Packaging Improvement Report) as prescribed in AR 700-58/

NAVSUPINST 4030.29/AFR 71-12/MCO P4030.29A, and DLAR 4145.8.

Discrepancy in Shipment Report (DISREP) (SF 361). Fill out and

forward Discrepancy in Shipment Report (DISREP) (SF 361) as prescribed in

AR 55-38/NAVSUPINST 4610.33B/AFR 75-18/MCO P461O.19C and DLAR 4500.15.

0-4.

REPORTING EQUIPMENT IMPROVEMENT RECOMMENDATIONS(EIR)

If your Power Supply PP-7548/U (HP-6205) needs improvement, let us know.

Send us an EIR.

don’t like about your equipment.

Tell us why a procedure is hard to perform.

You, the user, are the only one who can tell us what you

Let us know why you don’t like the design.

Put it on an SF 368 (Quality

Mail it to Commander, US Army Communications and

Deficiency Report).

Electronics Materiel Readiness Command and Fort Monmouth, ATTN: DRSEL-ME-

MQ, Fort Monmouth, New Jersey 07703. We'll send yOu _areply.

0-5.

ADMINISTRATIVE STORAGE

Administrative storage of equipment issued to and used by Army activities

shall be in accordance with paragraph 2-5.

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.

0-1

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TM 11- 6625- 2965- 14&P

may be programmed from a remote location by

means of an external voltage source or resistance.

b. Remote Sensing. The degradation in

1-1 DESCRIPTION

1-2

This power supply, Figure 1-1, is completely

regulation which would occur at the load because

of the voltage drop which takes place in the load

leads can be reduced by using the power supply in

the remote sensing mode of operation.

transistorized and suitable for either bench or re-

lay rack operations, The dual supply consists of

two independently controlled dual range sections;

both identical to the other. Each section can fur-

nish either a 0-40 Volt output at 300mA or a 0-20

Volt output at 600mA. Each section has its own

front panel meter and operating controls, The oper-

ating modes (40V or 20V) are selected by means of

the front panel RANGE switches, The VOLTAGE con-

trols permit each output voltage to be continuously

adjusted throughout either output range.

c. Series and Auto-Series Operation, Power

supplies may be used in series when a higher out-

put voltage is required in the voltage mode of op-

eration or when greater voltage compliance is re-

quired in the constant current mode of operation,

Auto-Series operation permits one knob control of

the total output voltage from a “master” supply.

d. Parallel and Auto-Parallel Operation, The

power supply may be operated in parallel with a

similar unit when greater output current capability

Auto-Parallel operation permits one

is required.

knob control of the total output current from a

“master” supply.

The power supply may be

e. Auto-Tracking.

used as a “master” supply, having control over one

supplies that furnish various volt-

(or more) “slave”

ages for a system.

1-6 SPECIFICATIONS

1-7 Detailed specifications for the power supply

are given in Table 1-1.

Figure 1-1. DC Power Supply, Model 6205B

1-8 OPTIONS

1-3 Both sections of the supply are of the regu-

lated, Constant Voltage/Current Limiting, type.

Each section is fully protected from overloads by

the fixed current limit which is set by means of an

internal adjustment.

1-9 Options are factory modifications of a stand-

ard instrument that are requested by the customer.

The following options are available for the instru-

ment covered by this manual, Where necessary, de-

tailed coverage of the options is included through-

out the manual.

1-4 Both front and rear terminals are available

for each section. Either the positive or negative

terminals may be grounded or the supply can be

operated at up to a maximum of 300 Volts off ground.

Each meter can be used to measure either output

voltage or output current in one of two ranges. The

voltage or current ranges are selected by the ap-

plicable METER switch on the front panel.

Description

Option No.

Voltage 10-Turn Pot: A single control

that replaces both coarse and fine

voltage controls and improves output

nettability.

Overvoltage_Protection_“Crowbar”:

A completely separate circuit for pro-

tecting delicate loads against power

supply failure or operator error. This

independent device monitors the out-

put voltage and within 10µsec imposes

a virtual short-circuit (crowbar) across

the power supply output if the preset

1-5 Two sets of programming terminals, located

at the rear of the unit, allow ease in adapting to

the many operational capabilities of the supply. A

brief description of these capabilities is given

below:

The power supply

a, Remote Programming,

1 1

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TM 11-6625-2965-14P

trip voltage is exceeded. When Op-

Rack Kit for mounting two 3½” high

supplies. (Refer to Section II for de-

tails.)

14523A

tion 11 is requested by the customer

the device is connected at the factory.

Trip Voltage Range: 2.5 to 44 Volts,

screwdriver adjustable.

1-12 INSTRUMENT AND SERVICE MANUAL

IDENTIFICATION

Detailed coverage of Option 11 is in-

cluded in Appendix A at the rear of

manuals that support power supplies

containing Option 11.

1-13 Hewlett-Packard power supplies are identi-

fied by a three-part serial number tag. The first

part is the power supply model number. The sec-

ond part is the serial number prefix, which con-

sists of a number-letter combination that denotes

the date of a significant design change. The num-

ber designates the year, and the letter A through

L designates the month, January through December

respectively, with “I” omitted. The third part is

the power supply serial number.

Three Digit Graduated Decadial

Voltage Control: Control that replaces

coarse and fine voltage controls per-

mitting accurate resettability.

Supply as normally

230Vac Input:

shipped is wired for l15Vac input.

Option 28 consists of reconnecting

the input transformer for 230Vac oper-

ation.

1-14 If the serial number prefix on your power

supply does not agree with the prefix on the title

page of this manual, change sheets are included

to update the manual. Where applicable, back-

dating information is given in an appendix at the

rear of the manual.

1-10 ACCESSORIES

1-11 The accessories listed in the following chart

may be ordered with the power supply or separately

from your local Hewlett-Packard field sales office

(refer to list at rear of manual for addresses).

ORDERING ADDITIONAL MANUALS

1-15

Description

1-16

8” Black Handle that can be attach-

ed to side of supply.

One manual is shipped with each power sup-

C05

ply, Additional manuals may be purchased from

your local Hewlett-Packard field office (see list

at rear of this manual for addresses). Specify the

model number, serial number prefix, and Part

number provided on the title page.

Rack Kit for mounting one 3½” high

supply. (Refer to Section II for de-

tails.)

14513A

1-2

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TM 11-6625-2965-14&P

Specifications

Table 1-1.

0-50 or 0-5 Volt voltmeter or as a 0-0.75 or

0.075 Amp ammeter.

INPUT:

l15Vac ±10%, single phase, 48-440 Hz.

OUTPUT CONTROLS:

OUTPUT:

RANGE switches select desired operating mode

for each section and coarse and fine VOLTAGE

controls set desired output voltages.

Two independent outputs, each of which can

be set at either 0-40 Volts @ 0.3 Amp or 0-20

Volts @ 0.6 Amp.

LOAD REGULATION:

Less than 0,01% plus 4mV for a full load to no

load change in output current.

OUTPUT TERMINALS:

Six “five-way” output posts (three for each

section of supply) are provided on the front

panel and two output terminal strips (one per

section) are located on the rear of the chassis.

A1l power supply output terminals are isolated

from the chassis and either the positive or neg-

ative terminals may be connected to the chassis

through separate ground terminals located on

the output termina1 strips.

LINE REGULATION:

Less than 0.01% plus 4mV for any line voltage

change within the input rating.

RIPPLE AND NOISE:

Less than 200µVrms 1mV p-p,

TEMPERATURE RANGES:

ERROR SENSING:

operating: 0 to 50°C. Storage: -40 to + 75⁰C .

Error sensing is normally accomplished at the

front terminals if the load is attached to the

front or at the rear terminals if the load is at-

tached to the rear terminals. Also, provisions

are included on the rear termina1 strips for re-

mote sensing.

TEMPERATURE COEFFICIENT:

Less than 0.02% plus lmV per degree Centi-

grade.

STABILITY.

Less than 0.10% plus 5mV total drift for 8

hours after an initial warm-up time of 30 min-

utes at constant ambient, constant line voltage,

and constant load.

REMOTE RESISTANCE PROGRAMMING:

200 ohms per Volt.

REMOTE VOLTAGE PROGRAM MING:

1 Volt per Volt.

INTERNAL IMPEDANCE AS A CONSTANT VOLT-

AGE SOURCE:

COOLING:

Less than 0.02 ohms from dc to lkHz.

Less than 0.5 ohms from lkHz to 1OOkHz.

Less than 3.0 ohms from 1OOkHz to lMHz.

Convection cooling is employed. The supply

has no moving parts.

SIZE:

3 ~ ½^"H x 12-5/8^"D x 8½^"W. Two of the units

TRANSIENT RECOVERY TIME:

Less than 50µsec for output recovery to with-

in 10mV following a full load current change in

the output.

can be mounted side by side in a standard 19”

relay rack.

WEIGHT:

10 lbs, net, 13 lbs. shipping.

OVERLOAD PROTECTION:

A fixed current limiting circuit protects the

power supply for all overloads including a

direct short placed across the terminals in con-

stant voltage operation.

FINISH:

Light gray front panel with dark gray case.

POWER CORD:

A three-wire, five-foot power cord is provided

with each unit.

METERS:

Each front panel meter can be used as either a

1-3

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TM 11-6625-2965-14&P

SECTION II

INSTALLATION

2-1 INITIAL INSPECTION

2-2 Before shipment, this instrument was in-

spected and found to be free of mechanical and

electrical defects. As soon as the instrument is

inspect for any damage that may have

unpacked,

occurred in transit. Save all packing materials

until the inspection is completed. If damage is

found, a claim should be filed with the carrier.

Hewlett-Packard Sales and Service office should

be notified.

2-3 MECHANICAL CHECK

2-4 This check should confirm that there are no

broken knobs or connectors, that the cabinet and

panel surfaces are free of dents and scratches,

and that the meter is not scratched or cracked.

2-5

ELECTRICAL CHECK

2-6 The instrument should be checked against its

electrical specifications. Section V includes an

“ in-cabinet” performance check to verify proper

instrument operation,

2-7 INSTALLATION DATA

2-8 The instrument is shipped ready for bench

operation. It is necessary only to connect the in-

strument to a source of power and it is ready for

operation.

Figure 2-1. Outline Diagram

2-9 LOCATION

how both types of installations are accomplished.

2-10 This instrument is air cooled. Sufficient

space should be allotted so that a free flow of

cooling air can reach the sides and rear of the in-

strument when it is in operation. It should be used

in an area where the ambient temperature does not

exceed 50°C.

2-15 To mount two units side-by-side, proceed

as follows:

a. Remove the four screws from the front

panels of both units.

b. Slide rack mounting ears between the

front panel and case of each unit.

c. Slide combining strip between the front

panels and cases of the two units.

d. After fastening rear portions of units to-

gether using the bolt, nut, and spacer, replace

panel screws.

2-11 OUTLINE DIAGRAM

2-12 Figure 2-1 is an outline diagram showing the

dimensions of the instrument.

2-13 RACK MOUNTING

2-16 To mount a single unit in the rack panel,

proceed as follows:

a. Bolt rack mounting ears, combining

straps, and angle brackets to each side of center

2-14 This instrument may be rack mounted in a

standard 19 inch rack panel either alongside a

similar unit or by itself. Figures 2-2 and 2-3 show

2-1

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TM 11-6625-2965-14&P

Figu re 2-2. Rack Mounting, Two Units

Rack Mounting, One Unit

Figu re 2-3.

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TM 11-6625-2965-14&P

spacing panels. Angle brackets are placed behind

combining straps as shown in Figure 2-3.

b. Remove four screws from front panel of

unit.

Slide combining strips between front

panel and case of unit.

d. Bolt angle brackets to front sides of case

and replace front panel screws.

2-17 INPUT POWER REQUIREMENTS

2-18 This power supply may be operated from

either a nominal 115 Volt or 230 Volt 48-440 Hertz

power source. The unit, as shipped from the fac-

tory, is wired for 115 Volt operation. The input

power required when operated from a 115 Volt 60

Hertz power source at full load is 31 Watts and

0.35 Amperes.

2-19 CONNECTIONS FOR 230 VOLT OPERATION

2-20 Normally, the two primary windings of the

input transformer are connected in parallel for op-

eration from 115 Volt source. To convert the power

supply to operation from a 230 Volt source, the

power transformer windings are connected in series

as follows:

Unplug the line cord and remove the unit

from case.

b. Break the copper between 54 and 55 and

also between 50 and 51 on the printed circuit

board. The se are shown in Figure 2-4, and are

labeled on copper side of printed circuit board.

Add strap between 50 and 55.

d. Replace existing fuse with 1 Ampere,

Return unit to case and operate

230 Volt fuse.

normally.

2-21 POWER CABLE

2-22 To protect operating personnel, the National

Electrical Manufacturers Association (NEMA) rec-

ommends that the instrument panel and cabinet be

grounded. This instrument is equipped with a

three conductor power cable. The third conductor

is the ground conductor and when the cable is

plugged into an appropriate receptacle, the instru-

ment is grounded. The offset pin on the power

cable three-prong connector is the ground connec-

tion.

Primary Connections

Figure 2-4.

2-23 To preserve the protection feature when op-

erating the instrument from a two-contact outlet,

use a three-prong to two-prong adapter and con-

nect the green lead on the adapter to ground.

instrument be used. The original packaging mate-

rial 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 office to which the

instrument can be shipped. Be sure to attach a

tag to the instrument which specifies the owner,

model number, full serial number, and service re-

quired, or a brief description of the trouble,

2-24 REPACKAGING FOR SHIPMENT

2-25 To insure safe shipment of the instrument, it

is recommended that the package designed for the

2-3

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TM 11-6625-2965-14&P

SECTION Ill

OPERATING INSTRUCTIONS

erational capabilities of the supply. A more theo-

retical description concerning these operational

features is contained in Application Note 90 and

in various Tech Letters. Copies of these can be

obtained from your local Hewlett-Packard field

office,

3-1 TURN-ON CHECKOUT PROCEDURE

3-5 NORMAL OPERATING MODE

3-6 The power supply is normally shipped with

its rear terminal strapping connections arranged

for Constant Voltage/Current Limiting, local sens-

ing, local programming, single unit mode of oper-

ation. This strapping pattern is illustrated in Fig-

ure 3-2. The operator selects a constant voltage

output using the front panel controls (local pro-

gramming, no strapping changes are necessary).

Front Panel Controls and Indicators

Figure 3-1.

3-2 The front panel controls and indicators are

The normal turn-on sequence,

shown in Figure 3-1.

is described below:

A. Push ON/OFF button ① and observe

that button lights,

② to desired operating

B. Set range switch

mode and meter switch to desired voltage range.

C. Adjust coarse and fine voltage controls

③ until desired output voltage is indicated on

meter.

Set meter switch to highest current range

circuit output terminals.

Observe short circuit output current on

and short

meter.

terminals

Remove short and connect load to output

(front or rear),

For Model 6205B, this procedure should

Norma 1 Strapping Pattern

Figure 3-2.

be used for both sections of supply.

3-7 CONSTANT VOLTAGE

3-3 OPERATING MODES

3-8 To select a constant voltage output turn on

the supply and, with no load connected, adjust

the VOLTAGE controls for the desired output volt-

age. To check the current limit, connect an ex-

ternal ammeter across the output of the supply,

turn the VOLTAGE controls fully clockwise, and

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 sup-

ply.

The terminal designations are stenciled in

white on the power supply above their respective

terminals. Although the strapping patterns illus-

trated in this section show the positive terminal

grounded, the operator can ground either termina1

or operate the power supply up to 300Vdc off

ground (floating). The following paragraphs de-

scribe the procedures for utilizing the various op-

The current limit is factory

adjusted to approximately 100mA above the current

If the existing current limit

observe the reading.

rating of the supply.

is not compatible with the anticipated load re-

quirements, the limit can be changed as outlined

in the following paragraphs.

3-1

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3-9 CHANGING CURRENT LIMIT

3-13 If load considerations require that the output

power distribution terminals be remotely located

from the power supply, then the power supply out-

put terminals should be connected to the remote

distribution terminals via a pair of twisted or

shielded wires and each load separately connected

to the remote distribution termina1s. For this case,

remote sensing should be used (Paragraph 3-25).

3-10 The current limit can be varied by adjusting

resistor R81, located on the printed wiring board.

This adjustment procedure is described in Para-

graph 5-74. In Models 6204B and 6206B, the cur-

rent limit may be reduced to a value lower than

that attainable by adjusting R81, by adding an ex-

ternal resistor as shown in Figure 3-3. The ap-

proximate value of the external resistance (Rx) can

be determined by using the following equation

R _X= 1 . 7 5

3-14 OPERATION BEYOND NORMAL RATED OUTPUT

3-15 Although the supply can deliver greater than

the rated output on both the lower and higher volt-

age ranges without being damaged, it can not be

guaranteed to meet all of its performance specifi-

where:

= the output current

cations.

this manner, the output is unstable when connect-

When greater than the lower rated

voltage is required, the higher voltage range

should be used.

Generally when operating the supply in

R = the internal current sampling resist-

ance for the particular operating mode

to be used.

ed to a load.

1.75 . the approximate voltage drop across

the internal sampling resistance at

the current limit crossover point.

This range will deliver half as

much output current and all specifications will

apply as listed in Table 1-1. However, if the line

voltage is maintained above its nomina1 value, the

supply will probably operate within specifications

above its rated output.

NOTE

The power supply’s performance will

be somewhat degraded if it is operated

too close to (within 10OmA) the current

limit crossover point.

3-16 OPTIONAL OPERATING MODES

3-17 REMOTE PROGRAMMING, CONSTANT VOLTAGE

3-18 The constant voltage output of the power

supply can be programmed (controlled) from a re-

mote location if required. Either a resistance or

voltage source can be used for the programming

A1 A2 A6 A7 A8 A9 -S

–

GND

+S A10

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 disabled according to the following pro-

cedures.

R x

R _L

3-19 Resistance Programming (Figure 3-4). In

this mode, the output voltage will vary at a rate

determined by the programming coefficient (200

ohms per Volt for Model 6204B and 6205B or 300

ohms per Volt for Model 6206 B). The output volt-

age will increase by 1 Volt for each 200 ohms (or

300 ohms) added in series with the programming

terminals. The programming accuracy is 1% of the

programmed voltage. If greater programming ac-

curacy is required, it may be achieved by chang-

ing resistor R13 as outlined in Section V.

Figure 3-3.

Current Limit Alteration

3-11 CONNECTING LOAD

3-12 Each load should be connected to the power

supply output terminals using separate pairs of

connecting wires.

pling effects between loads and will retain full

This will minimize mutual cou-

3-20 The output voltage of the power supply

should be zero Volts ± 20 millivolts when zero

ohms is connected across the programming termi-

nals. If a zero ohm voltage closer than this is re-

quired, it may be achieved by changing resistor

R6 or R8 as described in Section V.

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 re-

duce noise pickup. (If shield is used, connect one

end to power supply ground terminal and leave the

other end unconnected. )

3-2

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TM 11- 6625- 2965- 14&P

programming voltage source should be approxi-

mately 1000 ohms if the temperature and stability

specifications of the power supply are to be main-

tained. The programming accuracy is 1% of the

programmed voltage.

A7 A6 A8 A10+S

GND

–S

3-24 Methods of voltage programming with gain

are discussed in Application Note 90, Power Supply

Handbook; available at no charge from your local

Sales Office.

PROGRAMMING

RESISTOR

R _L

3-25 REMOTE SENSING (See Figure 3-6)

3-26 Remote sensing is used to maintain good

regulation 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 uti-

lizing the strapping pattern shown in Figure 3-6.

The power supply should be turned off before

changing strapping patterns. The leads from the

+S terminals to the load will carry less than 10

milliamperes of current, and it is not required that

these leads be as heavy as the load leads. H o w -

ever, they must be twisted or shielded to minimize

noise pick-up.

Figure 3-4.

Remote Resistance Programming

3-21 To maintain the stability and temperature

coefficient of the power supply, u se programming

resistors that have stable, low noise, and low

temperature (less than 30ppm per degree Centi-

grade) characteristics. A switch can be used in

conjunction with various resistance values in

The

order to obtain discrete output voltages.

switch should have make-before-break contacts

to avoid momentarily opening the programming

terminals during the switching interval.

C A U T I O N

Observe polarity when connecting the

sensing leads to the load.

3-22 Voltage Programming (Figure 3-5). Employ

the strapping pattern shown on Figure 3-5 for

In this mode, the output

voltage programming.

voltage will vary in a 1 to 1 ratio with the pro-

gramming voltage (reference voltage) and the load

on the programming voltage source will not exceed

25 microampere.

A 7 A 6 A 8 A 1 0 + S

A N D – – S

A7 A6 A8 A10 +S

GND

-S

REFERENCE

VOLTAGE

Figure 3-6. Remote Sensing

3-27 For reasonable load lead lengths, remote

sensing greatly improves the performance of the

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

erable distance from the supply, added precautions

must be observed to obtain satisfactory operation.

Notice that the voltage drop in the load leads sub-

Figure 3-5. Remote Voltage Programming

3-23 The impedance (Rx) looking into the external

3-3

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ages of the individual supplies. Each of the indi-

vidual supplies must be adjusted in order to obtain

the total output voltage. The power supply con-

tains a protective diode connected internally

across the output which protects the supply if one

power supply is turned off while its series part-

ner(s) is on.

tracts directly from the available output voltage

and also reduces the amplitude of the feedback er-

ror signals that are developed within the unit. Be-

cause of these factors it is recommended that the

drop in each load lead not exceed 1 Volt. If a

larger drop must be tolerated, please consuIt a

sales engineer.

3-32 Auto-Series Connections (Figure 3-8). The

Auto-Series configuration is used when it is de-

sirable to have the output voltage of each of the

series connected supplies vary in accordance with

the setting of a control unit. The control unit is

called the master; the controlled units are called

slaves. At maximum output voltage, the voltage

of the slaves is determined by the setting of the

front panel VOLTAGE control on the master. The

master supply must be the most positive supply of

NOTE

Due to the voltage drop in the load

leads, it may be necessary to readjust

the current limit in the remote sensing

mode.

3-28 Another factor that must be considered is

the inductance of long load leads which could af-

fect the stability of the feedback loop and cause

oscillation. In these cases, it is recommended

that the output capacitor (C20) be physically re-

moved from the power supply and placed across

the output terminals.

The current limit settings of all series

the series.

3-29 Although the strapping patterns shown in

Figures 3-4 and 3-5 employ local sensing, notice

that it is possible to operate a power supply si-

multaneously in the remote sensing and the remote

programming modes.

3-30 SERIES OPERATION

3-31 Normal Series Connections (Figure 3-7).

Two or more power supplies can be operated in

series to obtain a higher voltage than that avail-

able from a single supply. When this configuration

is used, the output voltage is the sum of the volt-

A7 A6 A8 A10-S

GND

–

–S

A7 A6 A8 A10

GND

–

–S

Figure 3-7. Normal Series Connections

Figure 3-8, Auto-Series, Two and Three Units

3-4

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determined by its voltage control setting.

units are effective and the current limit for the

entire configuration is equal to the lowest current

lim it setting. If any of the settings are too low,

automatic crossover to current limiting operation

will occur and the output voltage will drop. Re-

mote sensing and programming can be used; how-

ever, the strapping arrangements shown in the ap-

p licable figu res show local sensing and p rogram -

ming.

3-34 Au to-Parallel. The strapping patterns for

Auto-Parallel operation of two and three power sup-

p lies are show n in Figu re 3-9. Au to-Parallel op -

eration permits equal current sharing under all load

cond itions, and allow s com p lete control of the ou t-

put current from one master power supply. The out-

put current of each slave will be approximately

equ al to the m aster’s regard less of the load cond i-

tion s. Because the output current controls of each

slave are operative, they should be set to maximum

to avoid having the slave revert to constant current

operation; this would occur if the master output

cu rrent setting exceed ed the slave’s. In Model

6205B, it is necessary to m ake internal connections

in order to operate the supply in this mode. The

internal connections, sp ecified in Figu re 3-9, are

made to the sampling terminals of the current sam-

pling terminals of the current sampling resistor,

R54 (see Figu re 5-2).

3-33 In ord er to m aintain the tem p eratu re coeffi-

cient and stability sp ecifications of the p ow er

supply, the external resistors (Rx) shown in Figure

3-8 shou ld be stable, low noise, low tem p eratu re

coefficient (less than 30ppm per degree Centigrade)

resistors. The value of each resistor is dependant

on the maximum voltage rating of the master sup-

ply,

The value of Rx is this voltage divided by the

voltage programming current of the slave supply

(l/ Kp where Kp is the voltage programming coeffi-

cient). The voltage contribu tion of the slave is

3-5

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3-35 AUTO-TRACKING OPERATION (See Figure 3-10)

not desired, set the preset limit for the peak re-

quirement and not the average.

3-36 The Au to-Tracking configu ration is u sed

w hen it is necessary that several d ifferent voltages

referred to a common bus, vary in proportion to the

setting of a particular instrument (the control or

3-41 OUTPUT CAPACITANCE

3-42 An internal cap acitor, acress the ou tp u t ter-

minals of the power supply, helps to supply high-

current pulses of short duration during constant

A fraction of the master’s output voltage

m aster).

is fed to the comparison amplifier of the slave sup-

p ly, thu s controlling the slave’s ou tp u t. The m as-

ter must have the largest output voltage of any

power supply in the group (must be the most posi-

tive supply in the example shown on Figure 3-10).

voltage op eration.

Any cap acitance ad d ed exter-

nally will improve the pulse current capability, but

will decrease the safety provided by the current

lim iting circu it.

A high-current pulse may damage

load components before the average output current

is large enough to cause the current limiting cir-

cu it to op erate.

3-37 The ou tp u t voltage of the slave is a p ercent-

age of the m aster’s ou tp u t voltage, and is d eter-

mined by the voltage divider consisting of R^X(or

Rx and R^Y) and the voltage control of the slave

3-43 REVERSE VOLTAGE LOADING

su p p ly, R_p, w here:

E^MRP

3-44 A d iod e is connected across the ou tp u t ter-

R x + R p

m inals.

d iod e is reverse biased (anod e connected to neg-

ative term inal).

Under normal operating conditions, the

Turn-on and turn-off of the power supplies is con-

Remote sensing and pro-

trolled by the master.

If a reverse voltage is applied to

gramming can be used; although the strapping pat-

terns for these modes show only local sensing and

the output terminals (positive voltage applied to

negative term inal), the d iod e w ill cond u ct, shu nt-

ing current across the output terminals and limit-

ing the voltage to the forward voltage drop of the

In order to maintain the temperature

programming.

coefficient and stability sp ecifications of the p ow -

er su p p ly, the external resistors shou ld be stable,

d iod e.

This d iod e p rotects the series transistors

low noise, low temperature (less than 30ppm per

and the ou tp u t electrolytic cap acitors.

^OC) resistors.

3-45 REVERSE CURRENT LOADING

3- 38 SPECIAL OPERATING CONSIDERATIONS

3-46 Active load s connected to the p ow er su p p ly

may actually deliver a reverse current to the power

supply during a portion of its operating cycle. An

external source cannot be allowed to pump current

into the supply without loss of regulation and pos-

3-39 PULSE LOADING

3-40 The p ow er su p p ly w ill au tom atically cross

over from constant voltage to constant current op-

eration in response to an increase (over the preset

limit) in the output current, Although the preset

limit may be set higher than the average output

current high peak currents (as occur in pulse load-

ing) may exceed the preset current limit and cause

sible damage to the output capacitor.

To avoid

these effects, it is necessary to p reload the su p -

ply with a dummy load resistor so that the power

supply delivers current through the entire operat-

ing cycle of the load d evice.

If this crossover lim iting is

crossover to occu r.

3-6

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1 I-6625-2965-14&P

SECTION IV

PRINCIPLES OF OPERATION

REFERENCE

REGULATOR

CURRENT

LIMITING

CIRCUIT

B I A S

SUPPLY

INPuT

POWER

TRANSFORMER

B IA S

VOLTAGES

RECTIFIER

AND

F I L T E R

SERIES

REGULATOR

CURRENT

sAMPLING

RESISTORS

RANGE

SWITCH

( s 2 )

NOTE

CONSTANT

VOLTAGE

INPUT

—

D E N O T E S

V O L T A G E

C U R R E N T

FEEOBACK PATH

CIRCUIT

D E N O T E S

DRIVER

AMPL

LIMIT PATH

C I R C U I T

Figure 4-1.

Overall Block Diagram

4-1 OVERALL DESCRIPTION

obtain the proper regulated dc output voltage.

4-2

Figure 4-1 shows one section of the Model

dual power supply. The supply

4-4 Any changes in output voltage are felt by

constant voltage comparator which compares a

the

two dual range sections; each identical to the

other. Each section consists ofa rectifier and fil-

ter, a series regulator, an error amplifier and driver,

a constant voltage input circuit, a

circuit, a reference regulator circuit, a bias supply,

and a metering circuit.

portion of the output with a fixed reference volts ge.

If a difference exists, the comparator circuit sends

a n error signal to the series regulator via the error

amplifier and driver stages. This error signal

changes the conduction of the series regulator so

that a constant output voltage is maintained.

limiting

Since both sections of the

supply are identical, only one section is described

below.

4-5 Changes

output current are reflected in the

4-3 The ac line voltage is first applied to the

power transformer, The tap for the appropriate

voltage range is selected by S2. The input is then

rectified and filtered. This raw dc is then fed to

the series regulator which alters its conduction to

voltage drop across the current sampling resistor

network. If this voltage drop exceeds a preset

limit, the current limit transistor conducts, sending

a turn-down signal to the series regulator via the

driver. This signal changes the conduction of the

4-1

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series regulator so that the output current is limited

ponents). Transistor Q1 consists of two transistors

housed in a single package. The transistors have

matched characteristics minimizing differential

voltages due to mismatched stages. Moreover,

drift due to thermal differentials is minimized,

since both transistors operate at essentially the

same temperature.

to the proper value.

4-6 The reference circuit provides stable refer-

ence voltages used in the constant voltage compar-

ator and current limit circuits. The bias circuit

provides the less critical bias voltages used in the

supply.

4-7 The meter circuit provides a continuous indi-

cation of output voltage or current in both ranges.

4-17 The constant voltage comparator continuous-

ly compares a fixed reference voltage with a por-

tion of the output voltage and, if a difference ex-

ists, produces an error voltage whose amplitude

and phase is proportional to the difference. The

error output is fed back to the series regulator,

through the (mixer) error and driver amplifiers. The

error voltage changes the conduction of the series

regulator which, in turn, alters the output voltage

so that the difference between the two input volt-

ages applied to the differential amplifier is reduced

4-8 DETAILED CIRCUIT ANALYSIS

4-9 FEEDBACK LOOP

4-10 The feedback loop functions continuously to

keep the output voltage constant during normal op-

eration of the supply. For purposes of this discus-

sion, assume that the output voltage instantane-

ously rises (goes positive) due to a variation in the

external load circuit. Note that the change may be

in the form of a slow rise in the output voltage or a

positive going ac signal. An ac signal is coupled

to summing point A6 through capacitor Cl and a dc

voltage is coupled to A6 through R 10.

to zero.

The above action maintains the output

voltage constant.

4-18 Stage Q1B of the differential amplifier is

connected to a common (+S) potential through im-

pedance equalizing resistor R5. Resistors R6 and

R8 are used to zero bias the input stage, offset-

ting minor base-to-emitter voltage differences in

Q1. The base of Q1A is connected to a summing

point at the junction of the programming resistors

and the current pullout resistors, R12 and R13.

Instantaneous changes in output voltage result in

an increase or decrease in the summing point po-

tential. Q1A is made to conduct more or less, in

accordance with summing point voltage change.

The resultant output error voltage is fed back to

the series regulator via the remaining components

4-11 The rise in output voltage causes the voltage

at A6 and thus the base of Q1A to decrease (go neg-

ative). Q1A now decreases its conduction and its

collector voltage rises. The positive going error

voltage is amplified and inverted by Q3 and fed to

the base of the series transistor(s) via emitter fol-

lower Q4. The negative going input causes the

series transistor(s) to decrease its conduction so

that it drops more of the line voltage, reducing the

output voltage to its original level.

4-12 If the external load resistance decreases to

a certain crossover point, the supply will operate

in the current limiting mode. In the current limit

mode, Q1O conducts sending a negative going,

turn-down signal to the series regulator via driver

Q4 .

of the feedback loop.

Resistor Rl, in series with

the base Q1A, limits the current through the pro-

gramming resistors during rapid voltage turn-down.

Diodes CR1 and CR2 form a limiting network which

prevent excessive voltage excursions from over

4-13 SERIES REGULATOR

driving stage Q1A.

Capacitor Cl, shunting the

programming resistors, increases the high frequen-

cy gain of the input amplifier. Resistor R1 3, shunt-

ing pullout resistor R12, is factory selected so

that all of the + 6.2 Volt reference is dropped across

R12 and R13. Linear constant voltage programming

is assured with a constant current flowing through

4-14 The series regulator consists of transistor

stage Q7 (and Q6 on Model 6206 B). The regulator

serves as a series control element by altering its

conduction so that the output voltage is kept con-

stant and the current limit is never exceeded, The

conduction of the transistor(s) is controlled by the

feedback voltage obtained from driver Q4. Diode

CR11, connected across the regulator circuit, pro-

tects the series transistor(s) against reverse volt-

ages that could develop across it during parallel or

auto-parallel operation if one supply is turned on

before the other.

R1O.

C20 stabilizes the feedback loop and may be

removed to avoid current surges and increase the

programming speed.

4-19 ERROR AMPLIFIER AND DRIVER

4-20 The error and driver amplifiers amplify the

error signal from the constant voltage comparator

circuit to a leve1 sufficient to drive the series

4-15 CONSTANT VOLTAGE COMPARATOR

Driver Q4 also receives a

4-16 The circuit consists of the coarse and fine

programming resistors (Rl0A and R 10 B), and a dif-

ferential amplifier stage (Ql and associated com-

regulator transistor(s).

current limiting input if Q10, the current limiting

transistor, conducts.

4-2

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Multiple Range Meter Circuit, Simplified Schematic

Figure 4-2.

4-4

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SECTION V

MAINTENANCE

5-1 INTRODUCTION

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

formance check (Paragraph 5-10) should be made.

This check is suitable for incoming inspection. If

a fault is detected in the power supply while mak-

ing the performance check or during normal opera-

tion, proceed to the troubleshooting procedures

(Paragraph 5-48). After troubleshooting and repair

(Paragraph 5-58), perform any necessary adjust-

ments and calibrations (Paragraph 5-60). Before

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 doing any maintenance checks,

turn-on power supply, allow a ha if-hour warm-up,

and read the general information regarding meas-

urement techniques (Paragraph 5-3).

Figure 5-1.

Front Pane1 Terminal Connections

5-3

GENERAL MEASUREMENT TECHNIQUES

5-4

The measuring device must be connected

across the sensing leads of the supply or as close

to the output terminals as possible when measur-

ing the output impedance, transient response, reg-

ulation, or ripple of the power supply in order to

achieve valid measurements. A measurement made

acress 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 invalidat-

ing the measurement.

Figure 5-2. Output Current Measurement Technique

5-6 For output current measurements, the current

sampling resistor should be a four-terminal resis-

tor. The four terminals are connected as shown in

Figure 5-2. In addition, the resistor should be of

the low noise, low temperature coefficient (less

than 30ppm/°C) type and should be used at no

more than 5% of its rated power so that its temper-

ature rise will be minimized.

5-5 The monitoring device should be connected

to the +S and -S terminals (see Figure 3-2) or as

shown in Figure 5-1. The performance characteris-

tics should never be measured on the front termi-

nals if the load is connected across the rear termi-

nals. Note that when measurements are made at

the front terminals, the monitoring leads are con-

nected at A, not B, as shown in Figure 5-1. Fail-

ure to connect the measuring device at A will re-

sult in a measurement that includes the resistance

of the leads between the output terminals and the

point of connection.

When using an oscilloscope, ground one ter-

5-7

minal of the power supply and then ground the case

of the oscilloscope to this same point. Make cer-

tain that the case is not also grounded by some

other means (power line). Connect both oscillo-

scope input leads to the power supply ground ter-

minal and check that the oscilloscope is not ex-

hibiting a ripple or transient due to ground loops,

pick-up, or other means.

5-1

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5-8 TEST EQUIPMENT REQUIRED

5-9 Table 5-1 lists the test equipment required

to perform the various procedures described in this

Section.

NOTE

A satisfactory substitute for a differ-

ential voltmeter is to arrange a refer-

ence voltage source and null detector

as shown in Figure 5-3. The refer-

ence voltage source is adjusted so

that the voltage difference between

the supply being measured and the

reference voltage will have the re-

quired resolution for the measurement

being made. The voltage difference

will be a function of the null detector

that is used. Examples of satisfacto-

Figure 5-3. Differential Voltmeter Substitute,

Test Setup

ry null detectors are:

419A null

CAUTION

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 deflec-

tion of four divisions.

Care must be exercised when using an

electronic null detector in which one

input terminal is grounded to avoid

ground loops and circulating currents.

Table 5-1.

Test Equipment Required

REQUIRED

TYPE

RECOMMENDED

MODEL

USE

CHARACTERISTICS

Sensitivity: lmV full scale

(min.). Input impedance:

10 megohms (min.).

Measure dc voltages;

calibration procedures

3420 (See Note)

Differential

Voltmeter

Range: 90-130 Volts

Equipped with voltmeter ac-

curate within 1 Volt.

Vary ac input

Variable

Voltage

AC Voltmeter Accuracy: 2%. Sensitivity:

lmV full scale deflection

(min.).

403 B

Measure ac voltage and

ripple

140 A plus

1402A plug in.

Sensitivity: 10µV/cm. Differ-

Oscilloscope

Display transient response

waveforms

ential input.

Range: 5Hz to 600kHz

Accuracy: 2%

Oscillator

200 CD

412A

Impedance Checks

DC Voltmeter

Accuracy: 1%. Input resist-

ance: 20,000 ohms/Volt (min.).

Measure dc voltages

Measure transient response

Rate: 60-400 Hz, 2µsec rise

and fall time.

Repetitive

Load Switch

See Figure 5-6

5-2

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Test Equipment Required (Continued)

USE

Table 5-1.

REQUIRED

RECOMMENDED

MODEL

TYPE

Resistor

CHARACTERISTICS

- - - -

6204B, 6205B; 133 , ± 10% 15W Load Resistor, HIGH range

6206B; 120 , ±1O% 15W

R54 or R55,

Section VI

Current sampling

Value: 5 , 0.5%, 4.5 Watts,

20ppm, 4-Terminal.

- - - -

Load resistor, low range

Value: 6204B and 6205B, 28 ,

2W (min.).

6206B, 27 , 10W (min.).

- - - -

1K ± 1%, 2 Watt non-induc- Measure impedance

Resister

tive

- - - -

100 ohms, ±5%, 10 Watt

Measure impedance

Resistor

Calibrate programming current

Value: See Paragraph 5-67.

± 0.1%, 5 Watt

- - - -

Measure impedance

500µf, 50WVdc

Capacitor

Range: 0-150K (min.).

Accuracy: 0.1% plus 1 ohm

Make-before-break contacts.

Measure programming

coefficients

Decade

Resistance

Box

leads to the load and such lead lengths can easily

have an impedance several orders of magnitude

greater than the supply impedance (1 milliohm at

dc), thus invalidating the measurement.

5-10 PERFORMANCE TEST

5-11 The following test can be used as an incom-

ing inspection check and appropriate portions of

the test can be repeated either to check the oper-

ation of the instrument after repairs or for periodic

maintenance tests. The tests are performed using

a 115Vac 60 Hz, single phase input power source.

If the correct result is not obtained for a particu-

lar check, do not adjust any controls; proceed to

troubleshooting (Paragraph 5-48).

5-14 To avoid mutual coupling effects, each

monitoring device must be-connected directly to

the sensing terminals by separate pairs of leads.

The load resistor is connected acress the output

terminals and must be selected according to the

output voltage and current of the supply. When

measuring the constant voltage performance spec-

ifications, the CURRENT controls should be set

well above the maximum output current which the

supply will draw, since the onset of constant cur-

rent action will cause a drop in output voltage,

increased ripple, and other performance changes

not properly ascribed to the constant voltage op-

eration of the supply.

NOTE

For Model 6205B supplies, the follow-

ing performance checks should be

performed twice in order to check both

independent sections of the supply.

5-15 Voltage Output and Voltmeter Accuracy. To

check the output voltage, proceed as follows:

a. Connect 133 ohm load resistor (120 ohms

for Model 6206B) across rear output terminals of

supply.

b. Connect differential voltmeter acress +S

and -S terminals of supply observing correct polar-

ity.

5-12 CONSTANT VOLTAGE TESTS

5-13 For Constant Voltage measurements, the

measuring device must be connected acress the

rear sensing terminals of the supply in order to

achieve valid indications. A measurement made

acress the load includes the impedance of the

5-3

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TM 11-6625-2965-14&P

ferential voltmeter.

e. Disconnect load resistors.

Set METER switch to highest voltage

c .

range and RANGE switch to highest voltage mode

and turn on supply.

Reading on differential voltmeter should

not vary from reading recorded in Step d by more

than 8mVdc for Models 6204B and 6205B or 10mVdc

for Model 6206B supply.

d. Adjust VOLTAGE controls until front panel

meter indicates exactly the maximum rated output

voltage.

e. Differential voltmeter should indicate

maximum rated output voltage within 3%.

5-16 Output Current and Ammeter Accuracy. To

check the output current, proceed as follows:

Connect test setup shown in Figure 5-4.

Set METER switch to lowest current

range and RANGE switch to high voltage mode.

Turn on supply and adjust VOLTAGE con-

trols until front panel meter indicates exactly 300

mA (0.5 Ampere for Model 6206B supplies).

d. Differential voltmeter should read 1.5 ±

0.045Vdc.

Load Regulation, Test Setup

Figure 5-5.

5-19 Line Regulation.

Definition: The change, DE in the

OUT

static value of dc output voltage re-

sulting from a change in ac input volt-

age over the specified range from low

line 10% less than nominal to high

line 10% more than nominal or from

high line to low line.

Figure 5-4.

Output Current, Test Setup

5-20 To test the constant voltage line regulation,

proceed as follows:

Load Regulation.

5-17

a. Connect variable auto transformer be-

tween input power source and power supply power

input.

b. Turn CURRENT controls fuIly clockwise.

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

d. Adjust variable auto transformer for low

line (104Vac).

Definition: The change DE in the

OUT

static value of dc output voltage re-

sulting from a change in load resist-

ance from open circuit to a value

which yields maximum rated output

current (or vice versa).

To check the constant voltage load regula-

proceed as follows:

5-18

tion,

e. Set METER switch to highest current

range and turn on supply.

f. Adjust VOLTAGE controls until front

panel voltmeter indicates exactly the maximum

rated output voltage.

Connect test setup as shown in Figure

5-5.

b. Turn CURRENT controls fully clockwise.

c . Turn-on supply and adjust VOLTAGE con-

trols until front panel voltmeter indicates exactly

the maximum rated output voltage.

Read and record voltage indicated on

differential voltmeter.

h. Adjust variable auto transformer for high

line (126Vac).

d. Read and record voltage indicated on dif-

5-4

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TM 11-6625-2965-14&P

Reading on differential voltmeter should

not vary from reading recorded in Step g by more

than 8mVdc for Models 6204B and 6205B or 10mVdc

for Model 6206B.

Ripple and Noise.

5-21

Definition: The residual ac voltage

which is superimposed on the dc

output of a regulated power supply.

Ripple and noise may be specified

and measured in terms of its RMS

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 rating.

5-22 The amount of ripple and noise that is pres-

ent on the power supply output is measured either

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

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

larly important for applications where noise spikes

could be detrimental to a sensitive load, such as

The RMS measurement is not an

logic circuitry.

ideal representation of the noise, since fairly

high output noise spikes of short duration could

be present in the ripple and not appreciably in-

crease the RMS value.

5-23 The technique used to measure high frequen-

on the output of a power sup-

cy noise or “ spikes”

ply is more critical than the low frequency ripple

and noise measurement technique; therefore the

former is discussed separately in Paragraph 5-31,

Figure 5-6. CV Ripple and Noise, Test Setup

5-24 Ripple and Noise Measurements. Figure

5-6A 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 oscilloscope via the grounded power supply

case, the wire between the negative output termi-

nal 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 E_Gbetween the two

ground points causes an IR drop which is in series

with the scope input. This IR drop, normally hav-

ing a 60^HZline frequency fundamental, plus any

pickup on the unshielded 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 out-

put terminals of the power supply, and can com-

pletely invalidate the measurement.

can exist if an RMS voltmeter is substituted in

place of the oscilloscope in Figure 5-6. 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 mil-

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

frequency present on the output of an

supply is

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

scope display showing a 120Hz fundamental com-

ponent is indicative of a “clean” measurement set-

up, while the presence of a 60^HZfundamental usu-

ally means that an improved setup will result in a

more accurate (and lower) value of measured ripple.

5-26 Although the method shown in Figure 5-6A is

not recommended for ripple measurements, it may

prove satisfactory in some instances provided cer-

tain precautionary measures are taken. One meth-

od of minimizing the effects of ground current flow

(IG) is to ensure that both the supply and the test

instrument are plugged into the same ac power

buss.

5-25 The same ground current and pickup problems

5-5

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5-31 N oise Sp ike Measu rem ent. When

high fre-

5-27 To minimize pick up, a twisted pair or (pref-

erably) a shielded two-wire cable should be used

to connect the output terminals of the power supply

to the vertical inp u t term inals of the scop e. 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 in-

p u t term inal of the oscilloscop e. When u sing

shield ed tw o-w ire 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.

qu ency sp ike m easu rem ent is being m ad e, an in-

strument of sufficient bandwidth must be used; an

oscilloscope with a bandwidth of 20 MHz or more

is ad equ ate. Measu ring noise w ith an instru m ent

that has insufficient bandwidth may conceal high

frequency spikes detrimental to the load.

5-32 The test setu p illu strated in Figu re 5-6A is

generally not accep table for m easu ring sp ikes; a

d ifferen tial oscilloscop e is n ecessary. Fu rth er-

more, the measurement concept of Figure 5-6B

must be modified if accurate spike measurement is

to be achieved :

1. As show n in Figu re 5-7, tw o coax ca-

bles, m u st be su bstitu ted for the shield ed tw o-

w ire cable.

2. Im p ed ance m atching resistors m u st be

included to eliminate standing waves and cable

ringing, and the cap acitors m u st be connected to

block the dc current path.

5-28 To verify that the oscilloscop e is not d is-

playing ripple that is induced in the leads or pick-

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

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

ply terminals. The ripple value obtained when the

leads are shorted should be subtracted from the

actual ripple measurement.

3. The length of the test lead s ou tsid e the

coax is critical and m u st be kep t as short as p os-

sible; the blocking cap acitor and the im p ed ance

m atching resistor shou ld be connected d irectly

from the inner conductor of the cable to the power

su p p ly term inals.

5-29 If the foregoing m easu res are u sed , the

single-ended scope of Figure 5-6A may be adequate

to eliminate non-real components of ripple so that

a satisfactory m easu rem ent can be obtained .

How-

ever, in stu bborn cases or in m easu rem ent situ a-

tions where it is essential that both the power sup-

p ly case and the oscilloscop e case be connected

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

be necessary to u se a d ifferential scop e w ith float-

ing inp u t as show n in Figu re 5-6B. If d esired , tw o

single-cond u ctor shield ed cables m ay be su bsti-

tuted in place of the shielded two-wire cable with

ply end of the two coax cables are not connected

to the power supply ground, since such connec-

Notice that the shields of the power sup-

tion would give rise to a ground current path

through the coax shield, resulting in an erroneous

m easu rem ent.

Since the im p ed ance m atching resistors

2-to-1 attenu ator, — the noise sp ikes

equ al su ccess.

Because of its common mode re-

constitu te

jection, d ifferential oscilloscop e d isp lays only

observed on the oscilloscop e shou ld be less than

0.5mV p-p instead of lmV.

the d ifference in signal betw een its tw o vertical

input terminals, thus ignoring the effects of any

common mode signal introduced because of the dif-

ference in the ac potential between the power sup-

5-33 The circu it of Figu re 5-7 can also be u sed

for the normal measurement of low frequency ripple

p ly case and scop e case. Before u sing

d ifferen-

and noise;

simply remove the four terminating re-

tial input scope in this manner, however, it is im-

perative that the common mode rejection capability

of the scope be verified by shorting together its

two input leads at the power supply and observing

the trace on the CRT.

line, the scope is properly ignoring any common

mode signal present.

If this trace is a straight

If this trace is not a straight

line, then the scope is not rejecting the ground

signal and must be realigned in accordance with the

manufacturer’s instructions until proper common

m od e rejection is attained .

5-30 To check the rip p le and noise ou tp u t, p ro-

ceed as follow s:

Connect the oscilloscop e or RMS volt-

meter as shown in Figures 5-6A or 5-6B.

b. Adjust VOLTAGE control until front pane 1

meter indicates maximum rated output voltage.

c . The observed ripple and noise should be

less than 200µVrms and lmV p-p.

CV N oise Sp ike, Test Setu p

Figu re 5-7,

5 - 6

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TM 11-6625-2965-14&P

cury-wetted relay contacts. Switching of larger

load currents can be accomplished with mercury

pool relays; with this technique fast rise times

can still be obtained, but the large inertia of mer-

cury pool relays limits the maximum repetition rate

of load switching and makes the clear display of

the transient recovery characteristic on an oscillo-

scope more difficult.

sisters 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 5-7 be-

comes a two-cable version of Figure 5-6C.

Transient Recovery Time.

5-34

Definition: The time “X” for output

voltage recovery to within “Y” mil-

livolts of the nominal output volt-

5-37 To check the transient recovery time of the

supply, proceed as follows:

age following a “Z” Amp

step

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

b. Set METER switch to highest current

range and RANGE switch to lowest voltage mode.

change in load current - where:

“Y” is specified as 10 millivolts.

The nominal output voltage is de-

fined as the dc level half way be-

tween the static output voltage

before and after the imposed load

change, and “Z” is the specified

load current change, which is 5

Amperes.

Turn on supply and adjust VOLTAGE con-

trols until front panel meter indicates exactly the

maximum rated output current.

d. Close line on repetitive load switch set-

up.

Adjust 25 potentiometer until a stable

display is obtained on oscilloscope. Waveform

should be within the tolerances shown on Figure

5-9 (output should return to within 10mV of original

value in less than 50 microseconds).

A mercury-wetted relay, as connected in the

5-35

load switching circuit of Figure 5-8 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.

5-36 The maximum load ratings listed in Figure

5-4 must be observed in order to preserve the mer-

Figure 5-9. Transient Recovery Time, Waveforms

5-38 OUTPUT IMPEDANCE

5-39 To check the output impedance, proceed as

follows:

a. Connect test setup shown in Figure 5-10.

b. Set METER switch to highest voltage

range.

Turn on supply and adjust VOLTAGE con-

trols until front panel meter reads 20 Volts.

d. Set AMPLITUDE control on oscillator to

10 Volts (E_in), and FREQUENCY control to 100 Hz.

e. Record voltage across output terminals

of the power supply (E_o) as indicated on ac volt-

meter.

Transient Recovery Time, Test Setup

f. Calculate the output impedance by the

Figure 5-8.

5-7

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following formula:

supply should be placed outside the oven and

should have a long term stability adequate to in-

sure that its drift will not affect the overall meas-

urement accuracy.

5-43 To check the temperature coefficient, pro-

ceed as follows:

Connect test setup shown in Figure 5-5.

b. Turn CURRENT controls fully clockwise

and adjust front panel VOLTAGE controls until the

front panel voltmeter indicates 10Vdc.

c. Insert the power supply into the temper-

ature-controlled oven (differential voltmeter and

load resistance remain outside oven). Set the

temperature to 30°C and aIlow 30 minutes warm-

up.

The output impedance (Z_out) should be

less than 0,020 ohms.

h. Using formula of Step f, calculate output

impedance at frequencies of 50kHz and 500kHz.

Values should be less than 0.5 ohm and 3.0 ohms,

respectively.

d. Record the differential voltmeter indica-

tion.

30 minutes warm-up.

f. The differential voltmeter indication

Raise the temperature to 40°C and allow

should change by less than 90mV from indication

recorded in Step d.

5-44

Output Stability.

Definition: The change in output

voltage for the first eight hours

following a 30 minute warm-up

period. During the interval of

measurement all parameters,

such as load resistance, ambi-

ent temperature, and input line

voltage are held constant.

5-45 This measurement is made by monitoring the

output of the power supply on a differential volt-

meter or digital voltmeter over the stated measure-

ment interval; a strip chart recorder can be used

to provide a permanent record. A thermometer

should be placed near the supply to verify that the

ambient temperature remains constant during the

period of measurement. The supply should be put

in a location immune from stray air currents (open

doors or windows, air conditioning vents); if pos-

sible, 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 stabil-

ity specification of the power supply being meas-

ured. Typically, a supply may drift less over the

eight hour measurement interval than during the ½

hour warm-up period.

Figure 5-10. Output Impedence, Test Setup

5-40 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 resistance.

5-41 The temperature coefficient of a power sup-

ply is measured by placing the power supply in an

oven and varying it over any temperature span

within its rating.

(Most

power supplies are

rated for operation from 0°C to 55°C. ) The power

supply must be allowed to thermally stabilize for

a sufficient period of time at each temperature of

measurement.

5-42 The temperature coefficient specified is the

maximum temperature-dependent output voltage

change which will result over any 5°C interval.

The differential voltmeter or digital voltmeter

used to measure the output voltage change of the

5-46 Stability measurement can be made while

the supply is remotely programmed with a fixed

wire-wound resistor, thus avoiding accidental

changes in the front panel setting due to mechan-

ical vibration or “knob-twiddling. “

5-8

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ings taken at various points within the circuits.

These voltages are positioned adjacent to the ap-

plicable test points (identified by encircled num-

bers). Component and test point designations are

marked directly on the main printed wiring board.

5-47 To check the output stability, proceed as

Connect test setup shown

b. Turn CURRENT controls

Figure 5-5.

clockwise

and adjust VOLTAGE controls for 40Vdc output.

c. Allow 30 minutes warm-up then record

the differential voltmeter indication.

5-52

a defective component is located, replace

8 hours, differential voltmeter

from indication

it and re-conduct the performance test. When a

component is replaced, refer to the repair and re-

placements and adjustment and calibration para-

graphs in this section.

change by less than

recorded in Step c.

5-48 TROUBLESHOOTING

5-53 OVERALL TROUBLESHOOTING PROCEDURE

5-49 Before attempting to troubleshoot this in-

strument, ensure that the is with the instru-

ment and not with an associated circuit. The per-

formance test (Paragraph 5-10) enables this to be

determined without having to remove the instru-

ment from the cabinet.

5-54 To locate the cause of trouble

1, 2, and 3 in sequence.

Steps

(1) Check for obvious troubles such as

open fuse, defective power cord, input power fail-

ure, or defective voltage or current meter. Next

remove the top cover (held by four retaining

screws) and inspect for open connections, char-

red components, etc. If the trouble source cannot

be detected by visual inspection, proceed with

Step 2.

5-50 A

operation is a helpful aid

it is recommended that the reader review Section

IV of the before attempting to troubleshoot

understanding of the principles of

troubleshooting, and

the unit in detail. Once the principles of opera-

tion are understood, refer to the overall trouble-

shooting procedures in Paragraph 5-53 to

the symptom and probable cause.

(2) In almost

cases, the trouble can be

caused by improper dc bias or reference voltages;

thus, it is a good practice to check voltages in

Table 5-2, before proceeding with Step 3.

(3) Disconnect the

5-3 to determine your symptom and probable cause.

and examine Table

5-51 The schematic diagram at the rear of the

manual (Figure 7-1) contains normal voltage

Table 5-2. Reference Circuit Troubleshooting

NORMAL

RIPPLE

(P-P)

NORMAL

INDICATION

METER

COMMON

METER

POSITIVE

STEP

IF INDICATION ABNORMAL, TAKE THIS ACTION

6.2 0.3Vdc

6.2

Check 12.4 Volt bias or VR1 (See next paragraph)

Check 12.4 Volt bias or VR2 (See next paragraph)

12.4 *1.

Check Q8, Q9,

CR23, C1O,

7.5 .7Vdc

Check C12, CR8, CR24, CR25

Table 5-3.

Overall Trouble shooting

SYMPTOM

CHECKS AND PROBABLE CAUSES

High output voltage

output voltage

a. Front

meter defective.

b. Series regulator feedback loop defective. Refer to

5-4.

a. Fuses blown (Check or C14 for short).

5-9

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Table 5-3. Overall Troubleshooting (Continued)

CHECKS AND PROBABLE CAUSES

SYMPTOM

b. Front panel meter defective.

c. Series regulator feedback loop defective. Refer to Table 5-5.

a. Q10 open. R81 defective.

Will not current limit

High ripple

a. Check operating setup for ground loops.

b. If output floating, connect lµf capacitor between output and ground.

Ensure that supply is not crossing over to current limit mode under

loaded conditions.

Poor line regulation

Check reference circuit (Paragraph 5-55).

b. Check reference circuit adjustment (Paragraph 5-69).

a. Measurement technique. (Paragraph 5-17)

Poor load regulation

(constant voltage)

b. Check reference circuit (Paragraph 5-55) and adjustment (Para-

graph 5-69).

Ensure that supply is not going into current limit.

Oscillates (constant

voltage)

Check C5 for open, adjustment of R30 (Paragraph 5-72).

Poor stability

Check ± 6.2Vdc reference voltages (Paragraph 5-55).

(constant voltage)

b. Noisy programming resistor R10.

c. CR1, CR2 leaky.

d. Check Rl, R12, R13, for noise or drift.

e. Stage Q1 defective.

5-5b Series Regulating Feedback Loop. When

troubleshooting the series regulating loop, it is

useful to open the loop since measurements made

anywhere within a closed loop may appear abnor-

mal. With a loop closed, it is very difficult to

separate cause from effect. As described in

Tables 5-4 and 5-5, the conduction or cutoff ca-

pability of each stage is checked by shorting or

opening a previous stage, as follows:

5-55 To check the zener diodes in the reference

circuit, proceed as follows:

zener diode.

b. Connect appropriate load resistor, given

in Figure 5-4, across (+) and (-) output terminals.

Connect differential voltmeter across

Turn VOLTAGE control fully clockwise.

d. Set METER switch to highest current

range and turn on supply.

e. Adjust CURRENT controls until panel

meter reads exactly the maximum rated output cur-

rent.

Shorting the emitter to collector of a

transistor simulates saturation, or the full ON

condition.

2. Shorting the emitter to base of a transis-

tor cuts it off, and simulates an open circuit be-

tween emitter and collector.

ferential voltmeter.

Read and record voltage indicated on dif-

Short out load resistor by closing S1.

h. If reading on differential voltmeter dif-

fers by more than 1.07mV for 6204B and 6205B or

.946mV for 6206B from the reading in Step f, re-

place zener diode.

5-57 Although a logical first choice might be to

break the loop somewhere near its mid-point, and

then perform successive subdividing test, it is

5-10

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failures occur more often at the higher power

levels.

more useful to trace the loop from the series reg-

ulator backwards a stage at a time, since loop

Table 5-4. High Output Voltage Troubleshooting

RESPONSE

remains high.

PROBABLE CAUSE

ACTION

STEP

a. Series regulator Q7

(or Q6) shorted.

Check turn off of series

regulator by shorting Q4

emitter to collector.

a. Output voltage

b. Remove short and proceed

to Step 2.

b. Output voltage decreases.

a. Q4 open.

a. Output voltage remains high.

b. Output voltage decreases.

Check turn on of Q4 by

disconnecting collector

of Q3.

b. Reconnect lead and pro-

ceed to Step 3.

a. Q3 shorted.

Check turn off of Q3 by

disconnecting collector

of Q1A.

a. Output voltage remains high.

b. Output voltage decreases.

b, Check Q1A for short,

Q1B for open. Check for

open strap between A6

and A8. Check R10 for

open.

Table 5-5.

Low Output Voltage Troubleshooting

RESPONSE

ACTION

STEP

PROBABLE CAUSE

Check turn on of Q7

a. Q7 (or Q6) open.

a. Output voltage remains low.

b. Output voltage increases.

(and Q6, if included)

by opening the emitter

of Q4 .

b. Reconnect lead and pro-

ceed to Step 2.

Eliminate the current

limit circuit as a source

of trouble by discon-

necting the anode of

CR16.

a. Output voltage increases.

b. Output voltage remains low.

a. Q10 shorted, R81 defec-

tive.

b. Reconnect lead and pro-

ceed to Step 3.

a. Q4 shorted.

Check turn off of Q4 by

shorting Q3 emitter to

collector.

a. Output voltage remains low.

b. Output voltage increases.

b. Remove the short and

proceed to Step 4.

5-11

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Table 5-5. Output Voltage Troubleshooting (Continued)

PROBABLE CAUSE

RESPONSE

Check turn on of Q3 by

Output voltage remains low

a. Q3 open

shorting Q1A emitter to

collector

b. Output voltage increases

b, Check Q1A for open, QlB

for short. Check R10 for

short or open strap be-

tween A7 and A6

5-58 REPAIR AND REPLACEMENT

teristics of selected semiconductors. If the device

to be replaced is not listed in Table 5-6, the

standard manufacturers part number listed in Sec-

tion VI is applicable. After replacing a semicon-

ductor, refer to Table 5-7 for checks and adjust-

ments that may be necessary.

5-59 Before servicing a printed wiring board, re-

fer to Figure 5-11. Section VI of this manual con-

tains a tabular list of the instruments replaceable

parts. Before replacing a semiconductor device,

refer to Table 5-6 which lists the special charac-

Selected Semiconductor Characteristics

Table 5-6.

REFERENCE

DESIGNATOR

SUGGESTED

REPLACEMENT

STOCK NO.

CHARACTERISTICS

Matched differential amplifier. NPN Si. planar

70 (min.) h^FEi_c= lmA, VCE = 5V, Ico = 0.01µA

@ V^cbo⁼5V,

1854-0229

1854-0225

2 N 2 9 1 G . E .

NPN Power hFE = 35 (min.) @ Ic = 4A; VCE = 4V.

2N3055 R. C,A,

Table 5-7.

Checks and Adjustments After Replacement of Semiconductor Devices

REFERENCE

ADJUST

R6 or R8

FUNCTION

CHECK

Constant voltage (CV) line

and load regulation.

Constant voltage differential amplifier

Zero

volt output.

Q3, Q4

Error amplifiers

CV load regulation.

CV transient response.

R30

Q7 (Q6)

Q8, Q9

Series regulater

CV load regulation.

VR1, VR2,

CR20

Reference regulator

Reference circuit line

regulation.

Limiting diodes

CR1, CR2

CR8

CV load regulation.

Forward bias regulator

Voltage across diode

2.0 to 2.4 Volts.

5-12

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TM 11-6625-2965-l4&P

Checks and Adjustments After Replacement of Semiconductor Devices (Continued)

Table 5-7.

ADJUST

R81

REFERENCE

FUNCTION

CHECK

Q10, CR16

(CR21)

Current limit adjustment.

CR22 thru

CR29

Rectifier diodes

Voltage across appropriate

filter capacitor.

Positive reference voltage

Negative reference voltage

+6.2V line and load regu-

lation.

VR1

R46, VR1

R46, VR2

-6.2V line and load regu-

lation.

VR2

Connect an 8K, 0.1% resistor (18K re-

5-60 ADJUSTMENT AND CALIBRATION

sistor for Model 6206B supplies) between termi-

nals -S and A6 on rear barrier strip.

b. Disconnect jumper between A7 and A8

(leaving A6 and A7 jumpered).

5-61 Adjustment and calibration may be required

after performance testing, troubleshooting, or re-

pair and replacement. Perform only those adjust-

ments that affect the operation of the faulty circuit

and no others.

Connect decade resistance box in place

of R13.

d. Connect differential voltmeter between

+S and -S terminals on rear barrier strip.

5-62 METER ZERO

Set RANGE switch to high voltage mode,

5-63 Proceed as follows to zero meter:

a. Turn off instrument (after it has reached

normal operating temperature) and allow 30 sec-

onds for all capacitors to discharge.

METER switch to high voltage range, and turn on

supply.

f. Adjust decade resistance box so that

differential voltmeter reads 40 ± 0.4Vdc for

Models 6204B and 6205B or 60 ± 0.6Vdc for Model

6206B supplies,

Insert sharp pointed object (pen Point or

awl) into the small hole at top of round black plas-

tic disc located directly below meter face.

Replace decade resistance with resistor

of appropriate value in R13 position.

g .

Rotate plastic disc clockwise (^{C W}) until

meter reads zero, then rotate ccw slightly in order

to free adjustment screw from meter suspension, If

pointer moves, repeat Steps b and c.

5-68 Zero Output Voltage. To calibrate the zero

Volt programming accuracy, proceed as follows:

5-64 AMMETER TRACKING

Connect differential 1 voltmeter between

+S and -S terminals.

b. Short out voltage controls by connecting

jumper between terminals A6 and -S.

5-65 To calibrate the ammeter, proceed as fol-

lows:

a. Connect test setup as shown on Figure

5-4.

Turn on supply and observe reading on

b. Set RANGE switch to low voltage mode

and METER switch to lowest current range.

differential voltmeter.

If it is more positive than O Volts, shunt

Turn on supply and adjust VOLTAGE con-

resistor R6 with a decade resistance box.

Adjust decade resistance until differen-

trols so that differential voltmeter indicates ex-

actly 40Vdc.

d. Front panel meter should read 0.3 Amp

for Model 6204B and 6205B supplies, or 0.1 Amp

for Model 6206B supply. If it does not, adjust R72.

tial voltmeter reads zero, then shunt R6 with re-

sistance value equal to that of the decade resist-

ante.

If reading of Step c was more negative

than 0 Volts, shunt resistor R8 with the decade

resistance box.

5-66 CONSTANT VOLTAGE PROGRAMMING CURRENT

Adjust decade resistance until differen-

tial voltmeter reads zero then shunt R8 with a re-

sistance value equal to that of the decade box.

5-67 Programming Accuracy. To calibrate the pro-

gramming current, proceed as follows:

5-13

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TM 11- 6625- 2965- 14&P

5-14

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TM 11- 6625- 2965- 14&P

as follows:

5-69 REFERENCE CIRCUIT ADJUSTMENTS

Connect test setup as shown in Figure

5-70 Line Regulation. To ad ju st the line regula-

tion capabilities of the instrument proceed as fol-

lows :

5-8.

b. Repeat Steps a through f as outlined in

Paragraph 5-37.

Connect the differential voltmeter be-

Adjust R30 so that the transient response

tween +S (positive) and 31 (common).

b. Connect variable voltage transformer be-

tween supply and input power source.

c. Adjust line to 105Vac.

is as shown in Figure 5-9.

d. Connect decade resistance in place of

5-73 CURRENT LIMIT ADJUSTMENT

R46.

e. Set range switch to high voltage mode

and turn on supply.

5-74 To adjust the current limit so that the supply

can be used to furnish maximum rated output cur-

rent, proceed as follows:

Adjust decade resistance so that voltage

indicated by differential voltmeter does not change

more than 1.08 millivolts for 6204B and 6205B or

.946mV for 6206B as input line voltage is varied

from 105 to 125Vac.

a .

Connect test setup shown in Figure 5-5.

b. Short out load resistor (Ry).

c. Set RANGE switch to low voltage (high

current) mode.

g. Replace decade resistance with appropri-

ate value resistor in R46 position.

d. Turn on supply and rotate VOLTAGE con-

trols fully clockwise (maximum).

5-71 CONSTANT VOLTAGE TRANSIENT RECOVERY

TIME

Adjust R81 until differential volt meter

indicates 3.5Vdc for Models 6204B and 6205B sup-

plies or 3.6Vdc for Model 6206B supply.

5-72 To adjust the transient response, proceed

5-15

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TM 11-6625-2965-14&P

SECTION VI

REPLACEABLE PARTS

Table 6-1.

6-1 INTRODUCTION

Reference Designators (Continu ed )

= plug

= transistor

= resistor

6-2

This section contains information for ordering

= vacuum tube,

neon bulb,

p h otocell, etc.

= zener diode

= socket

rep lacem ent p arts. Table 6-4 lists p arts in alp ha-

numeric order by reference designators and provides

the following information:

= sw itch

= transformer

= term inal block

= thermal switch

Reference Designators. Refer to Table 6-1.

Descrip tion. Refer to Table 6-2 for ab-

= integrated cir-

cuit or network

breviations.

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

time the part number is listed except in instruments

containing m any su b-m od u lar assem blies, in w hich

case the TQ appears the first time the part number

is listed in each assem bly.

Table 6-2. Descrip tion Abbreviations

mfr

d. Manufacturer’s Part Number or Type.

e . Manufacturer’s Federal Supply Code Num-

ampere

manufacturer

be r.

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

ad d ress.

f. Hewlett-Packard Part Number.

Recommended Spare Parts Quantity (RS)

mod . = modular or

modified

= alternating

cu rrent

mtg

mounting

n a n o

assy. = assem bly

10^{- 9}

= board

for complete maintenance of one instrument during

one year of isolated service.

bkt

= bracket

= norm ally closed

= normally open

degree

h. Parts not identified by

reference desig-

Centigrad e

= card

n ickel-p lated

ohm

order by

d escrip tion

ou tsid e

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

chanical and / or Miscellaneou s. The form er consists

of parts belonging to and grouped by individual as-

sem blies; the latter consists of all p arts not im -

m ed iately associated w ith an assem bly.

c o e f = co efficien t

com p . com p osition

CRT

obd

cath od e-ray

tube

d iam eter

pico = 10-¹²

cen ter-tap p ed

DPDT =

P .C .

= d irect cu rrent

p rinted circu it

6-3 ORDERING INFORMATION

d ou ble pole,

double throw

pot. = p otentiom eter

p-p .

ppm

6-4 To ord er a rep lacem ent p art, ad d ress ord er or

inqu iry to you r local H ew lett-Packard sales office

(see lists at rear of this manual for addresses).

Specify the following information for each part:

Model, complete serial number, and any Option or

special modification (J) numbers of the instrument;

H ew lett-Packard p art nu m ber; circu it reference d es-

ignator; and d escrip tion. To order a part not listed

in Table 6-4, give a com p lete d escrip tion of the

p art, its fu nction, and its location.

p eak-to-p eak

DPST = d ou ble pole,

parts per

m illion

single throw

elect = electrolytic

en cap =

pvr

p eak reverse

voltage

en cap su lated

rect

= rectifier

= farad

degree

rms = root mean

square

SPDT = single p ole,

double throw

Farenheit

= fixed

fxd

silicon

germanium

Henry

= Hertz

= integrated

circu it

single p ole,

single throw

sm all signal

SPST =

Table 6-1.

Reference Designators

insid e d iam eter

= slow -blow

tan. = tantulum

titanium

= assem bly

= blower (fan)

= cap acitor

= circu it breaker

= diode

m iscellaneou s

electronic p art

incnd . in can d escen t

= kilo = 10³

= fuse

m ini = 10-3

volt

= variable

= jack, ju m p er

= relay

m ega . 10⁶

var

m icro

10^-6

d evice, signal-

ing (lamp)

wirewound

Watt

= inductor

= meter

m et . = m etal

6-1

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TM 11-6625-2965-14&P

Table 6-3. Code List of Manufacturers

6-2

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TM 11-6625-2965-l4&P

Code List of Manufacturers (Continued)

Table 6-3.

6-3

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TM 11-6625-2965-14&P

Code List of Manufacturers (Continued)

Table 6-3.

6-4

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TABLE 6-4. REPLACEABLE PARTS

REF.

TM11-6625-2965-14&P

MFR. PART NO.

MFR.

CODE

DESIG.

DESCRIPTION

PART NO.

FXD, ELECT 5µ 65VDC

09182

0180-1836

C2-4,6-8,

11,13,15,

17-19

NOT ASSIGNED

FXD, FILM . 001µ 200VDC

FXD, ELECT 4.7WF 35VDC

FXD, ELECT 100µUF 50 VDC

FXD, ELECT 490µF 85 VDC

FXD, CERAMIC .05µF 400VDC

FXD, ELECT 80µF 300VDC

192P10292

56289

09182

56289

09182

0160-0153

0180-0100

0180-1852

0180-1888

0150-0052

0180-1851

150D475X9035B2

C10,12

C14

C16

C20

33C17A

1N485B

CR1,2

RECT. SI. 250MA 200PRV

93332

1901-0033

CR3-5,9,

10,12-15,

18,19,21,

30-33

NOT ASSEIGNED

CR6

RECT. SI. 400MW 10PRV

RECY. SI. 400MW 10PRV

RECY. SI. 500MA 200 PRV

RECT. SI. 250MA 200PRV

RECT. SI. 500MA 200PRV

RECT. SI. 250MA 200PRV

RECT. SI. 500MA 200PRV

1N4828

1N4830

1N3253

1N485B

1N3253

1N485B

1N3253

03508

02735

93332

02735

93332

02735

1901-0461

1901-0460

1901-0389

1901-0033

1901-0389

1901-0033

1901-0389

CR7,8

CR11

CR16

CR17

CR20

CR22-29,34

DS1

LAMP NEON

09182

75915

2140-0244

2110-0002

FUSE CARTRIDGE 2A 250V 3AG

312002

SS NPN DIFF. AMP

NOT ASSIGNED

SS PNP SI.

09182

1854-0229

1853-0099

1853-0041

1854-0225

1853-0099

1854-0071

Q2,5,6

SS PNP SI.

POWER, NPN SI.

SS PNP SI.

Q9,10

SS NPN SI.

FXD, WW 1KW ±5% 3W

242E1025

56289

07716

01121

0813-0001

0698-5087

0698-3269

0757-0427

0686-3645

FXD, MET. FILM 6.2KW µ1% 1/8W

FXD, MET. FILM 23KW µ1% 1/8W

FXD, MET. FILM 1.5KW ±1% 1/8W

FXD, COMP 360KW ±5% ½W

TYPE CEA T-O

EB-3645

R3,4

R7,9,11

14-28,

32,35-40,

48,50,59

62-71,

74-79,

82-86

NOT ASSIGNED

FXD, COMP 560KW ±5% 1/2W

VAR. WW DUAL 10K-100

FXD, WW 1.3KW ±5% 3W

FXD, COMP (SELECTED) ±5% 1/2W

FXD, COMP 5.1KW ±5% 1/2W

VAR. WW 5KW (MODIFY)

FXD, COMP NKW ±5% 1/2W

FXD, COMP 2.4KW ±5% 1/2W

EB-5645

01121

09182

56289

01121

11236

01121

0686-5645

2100-0997

0811-1803

R10

R12

242E1325

R13

TYPE EB (OBD)

EB-5125

R29

0686-5125

2100-1824

0686-1025

0686-2425

R30

TYPE 110-F4

EB-1025

R31

R33

EB-2425

6-5

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TM11-6625-2965-14&P

REF.

MFR.

CODE

PART NO.

DESIG.

DESCRIPTION

MFR. PART NO.

R34

R41

R42

R43

R44

R45

R46

R47

R49

R51

R52

R53

R54,55

R56

R57

R58

R60

R61

R72

R73

R80

R81

R87

FXD, COMP 300W ±5% 1/2W

RXD, COMP 12KW ±5% 1/2W

FXD, COMP 6.8KW ±5% 1/2W

FXD, MET, FILM 470W ±1% 1/4W

FXD, COMP 47KW ±5% 1/2W

FXD, COMP 5.1KW ±5% 1/2W

FXD, COMP 100KW ±5% 1/2W

FXD, COMP 680W ±5% 1/2W

FXD, MET. OX 3KW ±5% 2W

FXD, COMP 20KW ±5% 1/2W

FXD, MET. FILM 1.21KW ±1% 1/8W

FXD, COMP 470W ±5% 1/2W

FXD, WW 5W ±0.5% 1/2W

EB-3015

01121

07716

01121

16299

01121

07716

01121

01686

07716

11236

07716

01121

11236

02606

0686-3015

0686-1235

0686-6825

0698-3506

0686-4735

0686-5125

0686-1045

0686-6815

0698-3642

0686-2035

0757-0274

0686-4715

0811-1920

0698-4428

0698-3496

0698-3440

0698-5147

0698-5091

2100-0439

0757-0316

0686-3335

2100-0391

0837-0023

EB-1235

EB-6825

TYPE CEB T-O

EB-4735

EB-5125

EB-1045

EB-6815

TYPE C42S

EB-2035

TYPE CEA T-O

EB-4715

TYPE E-30

TYPE CEA T-O

TYPE CEB T-O

TYPE CEA T-O

TYPE 110-F4

TYPE CEA T-O

EB-3335

FXD, MET. FILM 1.69KW ±1% 1/8W

FXD, MET. FILM 3.57KW ±1% 1/8W

FXD, MET. FILM 196W ±1% 1/8W

FXD, MET. FILM 4.81KW ±1% 1/4W

FXD, MET. FILM 45KW ±1% 1/8W

VAR. WW 250W (MODIFY)

FXD, MET. FILM 42.2W _1% 1/8W

FXD, COMP 33KW ±5% 1/2W

VAR. WW 1KW

TYPE 110-F4

LB16J1

THERMISTOR 64W ±10%

SWITCH, PILOT LIGHT (RED)

PUSH ON/OFF SPDT

54-61681-26 A1H

87034

09182

3101-0100

3100-1913

ROTARY SWITCH CONCENTRIC SHAFTS

TRANSFORMER, POWER

09182

9100-1821

VR1

VR2

DIODE, ZENER 6.2V

DIODE, ZENER 6-19V ±5% 400MW

1N821

1N753

06486

04713

1902-0761

1902-0049

MISCELLANEOUS

COVER, TOP

09182

58474

09182

79307

28520

70903

71785

09182

75915

5000-6061

5060-6118

5060-6119

06205-00001

1510-0040

1510-0039

0370-0107

0370-0101

0370-0102

0370-0179

1120-1230

4040-0295

1460-0720

5020-5541

1400-0330

0400-0013

8120-0050

0360-1143

4040-0067

0360-1273

1400-0084

CHASSIS, RIGHT

CHASSIS, LEFT

PANEL, FRONT

BINDING POST (MAROON)

BINDING POST(BLACK)

KNOB, BLACK (WITH POINTER)

KNOB, RED

DF21BC

KNOB, BAR, RED )WITH POINTER)

KNOB, BLACK

METER 2 1/2" DUAL SCALE 0-50V 0-.75A

BEZEL, METER 1/6 MOD

SPRING, METER

GUARD, BARRIER STRIP

CABLE CLAMP

T4-4

STRAIN RELIEF BUSHING

LINE CORD PLUG PH151 7 1/2'

JUMPER, BARRIER STRIP

PLASTIC EXTRUDSION BARRIER STRIP

BARRIER BLOCK

SR-5P-1

KH-4096

422-13-11 013

FUSEHOLDER

342014

6-6

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TM11-6625-2965-14&P

REF.

MFR.

DESIG. DESCRIPTION

MFR. PART NO. CODE

PART NO.

BRACKET, TRANSF. MFG

BRACKET, HEAT SINK

HEAT SINK, REAR

RUBBER BUMPER (FEET)

PRINTED CIRCUIT BOARD

RUBBER BUMPER, PRINTED CIRCUIT

BOARD

09182

87575

09182

06205-00002

5000-6060

0050-1035

0403-0088

06205-20020

MB50

4072

NF-207

734

87575

05820

08530

09182

0403-0086

1205-0033

0340-0174

0340-0166

0340-0168

9220-1218

9211-0848

HEAT DISSIPATOR (Q7, Q4)

MICA INSULATOR (Q7, Q4)

INSULATOR, TRANSISTOR PINS (Q7, Q40

INSULATOR (Q7,Q4)

END CAPS

CARTON

OPTION 07

10-TURN OUTPUT VOLTAGE CONTROL

R10

VAR. WW 10KW ±5% (10 TURN)

09182

2100-1866

0370-0137

KNOB

OPTION 13

10-TURN VOLTAGE CONTROL

WITH DECADIAL

VAR. WW 10KW ±5% (10 TURN)

09182

07716

2100-1866

1140-0020

DECADIAL

RD-411

6-7

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TM11-6625-2965-14&P

PART NUMBER - NATIONAL STOCK NUMBER

CROSS REFERENCE INDEX

NATIONAL

STOCK

NUMBER

PART

NUMBER

STOCK

PART

NUMBER

FSCM

NUMBER

FSCM

DF21BC

58474

28480

03508

28480

5940-00-738-6269

5910-00-797-4909

5910-00-965-9728

5910-00-752-4172

5910-00-974-6135

5910-00-931-7060

5910-00-884-1194

5355-00-068-4557

5355-00-906-8933

5355-00-926-5508

5905-00-195-6761

5905-00-903-6304

5905-00-997-5436

5905-00-222-5571

5905-00-279-2019

5905-00-828-0377

5905-00-407-0106

5905-00-431-6844

5905-00-469-2837

5905-00-858-9105

5905-00-981-7475

5905-00-998-1906

5905-00-917-0578

5905-00-858-6795

5905-00-932-0413

5961-00-103-3950

5355-00-584-0840

5999-00-871-9538

5920-00-881-4636

150D475X9035B2

1510-0039

1853-0041

1853-0099

1854-0071

1854-0087

1854-0225

1854-0229

1901-0033

1901-0460

1901-0461

1902-0049

1902-3002

192P10292

2N3417

56289

28480

56289

03508

28480

56289

28480

75915

08530

28480

5910-00-177-4300

5910-00-752-4172

5940-00-738-6269

5961-00-931-8259

5961-00-450-4689

5961-00-137-4608

5961-00-824-7567

5961-00-072-0094

5961-00-867-9318

5961-00-821-0710

5961-00-867-9206

5961-00-937-3918

5961-00-911-9277

5961-00-252-1307

5910-00-993-8305

5961-00-937-3768

5905-00-918-7471

5905-00-851-3924

5905-00-892-9626

5905-00-110-0282

5240-00-951-3376

5905-00-504-4892

5910-00-691-1255

5910-00-130-2712

5930-00-918-4381

5930-00-476-9679

5920-00-280-5062

5920-00-881-4636

5970-00-840-5109

5625-00-052-4921

0150-0052

0160-0153

0180-0100

0180-1836

0180-1852

0180-1888

0370-0101

0370-0102

0370-0107

0686-1045

0686-2035

0686-3335

0686-4735

0686-5125

0698-3440

0698-3496

0698-3506

0698-5087

0757-0274

0757-0316

0757-0346

0757-0427

0757-0440

0813-0001

1N4830

2100-0281

2100-0439

2100-1824

2100-1866

2140-0244

242E1025

30D105G050BA2

3101-0100

3101-1248

312002

1140-0020

1205-0033

1400-0084

342014

734

8120-0050

6-8

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TM 11-6625-2965-14&P

SECTION VII

CIRCUIT DIAGRAMS

wiring board.

This section contains the circuit diagrams neces-

sary for the operation and maintenance of this

Schematic Diagram, Figure 7-2, which

illustrates the circuitry for the entire power sup-

ply. Voltages are given adjacent to test points,

identified by encircled numbers on the schematic

and printed wiring board.

power supply. Included are:

Component Location Diagram, Figure

7-1, which shows the physical location and refer-

ence designator of parts mounted on the printed

7-1

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TM ll-6625-2965-14&P

APPENDIX A

REFERENCES

DA Pam 310-4

DA Pam 310-7

Index of Technical Manuals, Technical Bulletins,

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

Bulletins,

and Lubrication Orders.

US Army Equipment Index of Modification Work

Orders.

TM 38-750

The Army Maintenance Management System

Procedures for Destruction of Electronics Materiel

to Prevent Enemy Use (Electronics Command).

TM 750-244-2

TM 11-2019

Test Sets 1-49, 1-49-A, and 1-49-B and Resistance

Bridges

and

Organizational Maintenance:

TM 11-6625-203-12

TM 11-6625-654-14

meter

AND

(Including

ME-77/u and

operators, Organizational, Direct Support, and

General Support Maintenance Repair Parts and

Special Tools List (Including Depot Maintenance

Repair Parts and Special Tools List) for

TM 11-6625-822-12

TM 11-6625-2616-14

Operator and Organizational Maintenance Manual;

Signal Generator

Operator’s Organizational, Direct Support, and

General Support Maintenance Manual; Digital

Voltmeter

TM 11-6625-2658-14

Operator’s, Organizational, Direct Support, and

General Support Maintenance Manual for Oscillo-

scope

(NSN 6625-OO-1O6-9622).

TM 11-6625-2724-12

TB 43-180

Operator’s and Organizational Maintenance Manual:

Voltmeter, Electronic

(NSN 6625-00-972-4046),

Calibration Requirements for the Maintenance of

Army Materiel.

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TM 11- 6625- 2965- 14&P

APPENDIX B

COMPONENTS OF END ITEM LISTING

ICOEIL

1 each Power Supply HP 6205B

6625- 00- 437- 4861

BILL

AAL

Technical Manual TM 11-6625-2965-14&P

N/A

B-1

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TM 11-6625-2965-14&P

APPENDIX C

MAINTENANCE ALLOCATION

Section 1.

INTRODUCTION

in precision measurement. Consists of compari-

sons of two instruments, one of which is a certified

standard of known accuracy, to detect and adjust

any discrepancy in the accuracy of the instrument

being compared.

C -1. General

This appendix provides a summary of the main-

t en a n ce oper a t ion s for t h e P P -7548/U. It

authorizes categories of maintenance for specific

maintenance functions on repairable items and

components and the tools and equipment required

to perform each function. This appendix may

be used as an aid in planning maintenance opera-

tions.

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

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

nent or assembly) in a manner to allow the proper

functioning of the equipment or system.

h. Replace. The act of substituting a serviceable

like type part, subassembly, or module (component

or assembly) for an unserviceable counterpart.

C-2. Maintenance Function

Maintenance functions will be limited to and de-

fined as follows:

i. Repair. The application of maintenance serv-

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

replace) or other maintenance actions (welding,

grinding, riveting, straightening, facing, rema-

chining, or resurfacing) to restore serviceability

to an item by correcting specific damage, fault,

malfunction, or failure in a part, subassembly,

module (component or assembly), end item, or

system.

a. Inspect. To determine the serviceability of an

item by comparing its physical, mechanical, and/

or electrical characteristics with established stand-

ards through examination.

b. Test. To verify serviceability and to detect

incipient failure by measuring the mechanical or

electrical characteristics of an item and compar-

ing those characteristics with prescribed stand-

ards.

j. Overhaul. That maintenance effort (service/

action ) necessary to restore an item to a complete-

ly serviceable/operational condition as prescribed

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

priate technical publications. Overhaul is normally

the highest degree of maintenance performed by

the Army. Overhaul does not normally return an

item to like new condition.

c. Service. Operations required periodically to

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

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

to paint, or to replenish fuel, lubricants, hydraulic

fluids, or compressed air supplies.

d. Adjust To maintain, within prescribed limits,

by bringing into proper or exact position, or by

setting the operating characteristics to the speci-

fied parameters.

k. Rebuild. Consists of those services actions

necessary for the restoration of unserviceable

equipment to a like new condition in accordance

with original manufacturing standards. Rebuild

is the highest degree of materiel maintenance

applied to Army equipment. The rebuild operation

includes the act of returning to zero those age

measurements (hours, miles, etc. ) considered in

classifying Army equipments/components.

e. Align. To adjust specified variable elements

of an item to bring about optimum or desired

performance.

f. Calibrate. To determine and cause corrections

to be made or to be adjusted on instruments or

test measuring and diagnostic equipments used

C-1

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TM 11-6625-2965-14&P

C-3. Column Entries

e. Column 5, Tools and Equipment. Column 6

specifies by code, those common tool sets (not

individual tools) and special tools, test and sup-

port equipment required to perform the designated

function.

a. Column 1, Group Number. Column 1 lists

group numbers, the purpose of which is to identify

components, assemblies, subassemblies, and mod-

ules with the next higher assembly.

b. Column 2, Component/ Assembly.Column 2

contains the noun names of components, assem-

blies, subassemblies, and modules for which main-

tenance is authorized.

f. Column 6, Remarks. Column 6 contains an

alphabetic code which leads to the remark in

section IV, Remarks, which is pertinent to the

item opposite the particular code.

c. Column 3, Maintenance Functions Column 3

lists the functions to be performed on the item

listed in column 2. When items are listed without

maintenance functions, it is solely for purpose

of having the group numbers in the MAC and

RPSTL coincide.

C-4. Tool and Test Equipment Requirement

(sect Ill)

a. Tool or Test Equipment Reference Code. Th e

numbers in this column coincide with the numbers

used in the tools and equipment column of the

MAC. The numbers indicate the applicable tool

or test equipment for the maintenance functions.

d. Column 4, Maintenance Category. Column 4

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

the appropriate subcolumn (s), the lowest level of

maintenance authorized to perform the function

listed in column 3. This figure represents the ac-

tive time required to perform that maintenance

function at the indicated category of maintenance.

If the number or complexity of the tasks within

the listed maintenance function vary at different

maintenance categories, appropriate “worktime”

figures will be shown for each category. The num-

ber of task-hours specified by the “worktime”

figure represents the average time required to

restore an item (assembly, subassembly, compo-

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

condition under typical field operating conditions.

This time includes preparation time, troubleshoot-

ing time, and quality assurance/quality control

time in addition to the time required to perform

the specific tasks identified for the maintenance

functions authorized in the maintenance allocation

chart. SubColumns of column 4 are as follows:

b. Maintenance Category. The codes in this

column indicate the maintenance category allo-

cated the tool or test equipment.

c. Nomenclature. This column lists the noun

name and nomenclature of the tools and test

equipment required to perform the maintenance

functions.

d. National/NATO Stock Number. This colu m n

lists the National/NATO stock number of the

specified tool or test equipment.

e. Tool Number. This column lists the manu-

facturer’s part number of the tool followed by the

Federal Supply Code for manufacturers (5-digit)

in parentheses.

C-5. Remarks (sect IV)

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

propriate item in section II, column 6.

C - Operator/Crew

0- Organizational

F- Direct Support

H - General Support

D - Depot

b. Remarks. This column provides the required

explanatory information necessary to clarify items

appearing in section II.

C-2

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SECTION II MAINTENANCE ALLOCATION

FOR

CHART

POWER SUPPLY PP-7548/U

(4)

MAINTENANCE CATEGORY

(1)

(2)

(5)

TOOLS

AND

(3)

(6)

GROUP

NUMBER

COMPONENT/ASSEMELY

MAINTENANCE

FUNCTION

REMARKS

EQPT.

Power Supply PP-7548/U

Inspect

Service

Test

0 . 1

Inspect

Service

Test

Adjust

Repair

0.2

1 . 2

0 . 6

1 . 3

3-11

Overhaul

3-11

C-3

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SECTION III TOOL AND TEST EQUIPMENT REQUIREMENTS

FOR

POWER SUPPLY PP-7548/U

TOOL OR TEST

EQUIPMENT

REF CODE

MAINTENANCE