HP 722A Service manual

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HEWLETT-PACKARD

COMPA

01155·1

OPERATING

AND

SERVICE

MANUAL

MODEL

722A/AR

SERIALS

PREFIXED:

105-

POWER

SUPPLY

HEWLETT.PACKARD

COMPANY

1961

1501

PAGE

Mill

ROAD.

PALO

ALTO,

CALIFORNIA,

U.S.A.

rioted:

NOY

1961

Model 722A

TABLE

CONTENTS

Table

of Contents

List

Illustrations

and

Tables

Section

,Page

VMAINTENANCE

5-1

5-1.

Introduction

5-1

5-3.

Maintenance

Procedures

5-1

5-4.

Dustcover

Removal

5-1

5-6.

Zero-Setting

the

Meter

5-1

5-8.

Printed

Circuit

Board

Removal

5-1

5-10.

Test

Equipment

Required

5-1

5-12.

Performance

Check

5-1

5-14.

Troubleshooting

5-1

5-15.

Introduction

5-1

5-17.

Trouble

Analysis

•

5-1

5-20.

Detailed

Test

Procedure

5-5

5-23.

Reference

Voltage

Adjustment

5-6

5-25.

Monitoring

5-6

5-27.

Voltage Range

5-6

5-29.

Current

Limit

5-6

5-32.

Performance

Test

5-6

5-34.

Voltage Range

5-6

5-36.

Current

Limiting.

5-7

5-38.

Operation

Characteristics

•

5-7

5-39.

Ripple

Characteristics

5-7

5-40.

Load

Regulation

5-7

5-41.

Line

Regulation

5-8

Section

Page

IGENERAL INFORMATION

....

1-1

1-1.

Introduction

. . . . . 1-1

1-4.

Description

. . . . .

1-1

1-8.

Differences

Equipment

. .

1-1

1-10.

Equipment

Supplied . . . .

1-1

1-12.

Other

Modes of

Operation

1-1

PREP

ARATION FOR

USE

2-1

2-1.

Unpackingand

Mechanical

Inspection

2-1

2-4.

Site

Selection

and

Installation

2-1

2-6.

Line

Power

2-1

2-8.

Operation

from

230-Volt Supply

2-1

2-11.

Preparation

for

Storage

and Shipment

2-1

2-14.

Storage

2-1

2-16.

Incoming

Inspection

&Perform.

Test

2-1

III OPERATING INSTRUcrIONS

3-1

3-1.

Operation

3-1

3-3.

Current

Limiting

3-1

3-6.

Remote

Sensing

3-1

PRINCIPLES

OPERATION

4-1

4-1.

Overall

Block

Diagram

4-1

4-3.

Rectifyingand

Filtering

Circuits

4-1

4-6.

Series

Regulator

4-2

4-8.

Output

Circuit

4-2

4-10.

Voltage Regulating

Circuit

4-2

4-14.

Current-

Power

Limiter

4-2

4-18.

Protection

Circuits

4-3

REPLACEABLE

PARTS

-1.

Introduction

. . .

6-5.

Ordering

Information

. .

6-1

01155-1

LIST

ILLUSTRATIONS

Number

Title

1-1.

Model 722AR DC

Power

Supply.

3-1.

Operating

Controls

.........

3-2.

Remote

Sensing.

. .

3-3.

Charging

Batteries

3-4.

Parallel

Operation

-1.

Simplified

Schematic

4-2.

Block

Diagram.

. . .

4-3.

Current

Power

Limiter

5-1.

Model

722A

Bottom View

5-2.

Model 722A

Top

View

5-3.

Servicing

Etched

Circuit

Boards

5-4.

Reference

Power

Supply

(Schematic)

5-5.

Power

Supply

(Schematic)

. . . • . .

LIST

TABLES

Number

Title

1-1.

Specifications

. . . . • . . .

5-1.

Recommended

Test

Equipment

5-2.

Troubleshooting

Guide

5-3.

Replacement

Guide . . . . • . . • .

6-1.

Reference

Designation

Index

6-2.

Replaceable

Parts

....

Page

1-1

3-0

3-1

4-0

4-1

4-3

5-2

5-3

5-4

5-9

5-10

Page

1-0

5-0

5-5

6-2

6-6

iii

Section I

Table

1-1

Model 722A

Table

1-1.

Specifications

RATED OUTPUT: o

volts

dc; 0

amperes

LINE REGULATION:

Less

than 2.5

change

for

10%

line

voltage

change; output

set

between 0

volts

LOAD REGULATION:

Less

than 5

change

output

terminals

for

amperes

change;

output

set

between 0and 60

volts

TRANSIENT RECOVERY TIME:

Less

than 200

sec

for

recovery

within 5

for

change

from

full

load

full

load

any

rated

output

line

voltage

NOISE

AND

RIPPLE:

Less

than 250

rms

TEMPERATURE

STABILITY:

Better

than

0.02%j

JOC,

whichever

larger

TEMPERATURE

RANGE: o

550

for

operation

within

specifications

OUTPUT IMPEDANCE: DC:

Less

than 2.5

milliohms

AC:

Less

than 5

milliohms

series

with 10

Ilh

OUTPUT METERS: Voltage: 0

volts,

one

range

Current:

2.5 amp, one

range

PROTECTION: Output

current

limiter

continuously

adjustable

from

100 rna

2.2 a

COOLING:

Forced

air

Iii

it 16

:E'

---.t

",,~!I·J

SIDE

4ii

722AR

Rack

Mount:

DIMENSIONS:

WEIGHT:

Rack

Mount: Net 34

POWER: 115

230

volts

10%,

cps,

250

watts

depending on

line

and

load

conditions

1-0

01155-1

Model 722A

SECTION

GENERAL

INFORMATION

Section I

Paragraphs

1-1

1-13

1-1.

INTRODUCTION.

1-2.

This

operating

and

service

manual

for

the

Model 722A

Power

Supply.

This

manual

appli-

cable

only

instruments

with

the

prefix

shown on

the

front

cover

except

modified

change

sheets.

1-3.

Hewlett-Packard

instruments

use

two-section

eight-digit

serial

number,

that

is,

000-00000.

The

first

three

digits

are

identification

number;

the

last

five

digits

are

the

instrument

serial

number.

the

identification

number

the

instrument

does

not

agree

with

the

identification

number

shown on

the

manual

title

page,

there

are

differences

between

the

manual

and

instrument.

These

differences

are

de-

scribed

manual

change

sheets

having

the

proper

identification

number.

1-4.

DESCRIPTION.

1-5.

The

C€tJ

Model 722A

Power

Supply

com-

pletely

transistorized,

regulated

power

supply.

will

supply

volts

amperes

with continuous

adjustment

voltage

and

current

limiting.

The

cur-

rent

limit

c~n

set

any

current

between 100

and

amperes

protect

circuit

elements,

such

transistors,

under

test.

1-6.

Two

meters

measure

both

current

and

voltage

drawn

the

load

continuously

that

you

may

monitor

power

supply

drain

conveniently.

The

output

impedance

low

for

both dc and

that

minimum

de-

coupling

required

cascaded

circuits.

Terminals

for

remote

sensing

are

provided

the

rear

the

chassis

that

the

ohmic

resistance

the

supply

leads

minimized.

1-7.

The

usefulness

the

Model 722A

not

limited

transistor

applications,

but

useful

wherever

high

stability

required.

For

instance,

Model 722A

excellent

source

for

regulating

the

filament

voltage

vacuum

tubes.

1-8.

DIFFERENCES

EQUIPMENT.

1-9.

This

manual

has

been

written

and

illustrated

for

the

Model 722AR

(rack-mounted

instrument)

since

this

the

only

style

instrument

available

the

time

writing.

cabinet-mount

model

may

become

avail-

able

the

future.

This

manual

will

also

apply

the

electrical

details

the

cabinet-mounted

model

even

though

the

physical

configuration

may

different.

1-10.

EQUIPMENT

SUPPLIED.

1-11.

The

equipment

supplied

consists

of only

the

Model 722A

Power

Supply

this

supply

com-

plete

itself.

1-12.

OTHER

MODES

OPERATION.

1-13.

Two

Model 722A's

may

connected

series

for

greater

voltage.

Do not

connect

than two

722A's

series.

Refer

section

III

for

instructions

before

attempting

operate

these

supplies

parallel.

01155-1

Figure

1-1.

Model 722AR

Power

Supply

1-1/1-2

Model 722A

SECTION

PREPARATION

FOR

USE

Section

Paragraphs

2-1

2-17

2-1.

UNPACKING

MECHANICAL

INSPECTION.

2-2.

Inspect

instrument

for

signs

damage

incurred

shipment.

This

instrument

should

tested

soon

received.

fails

operate

properly,

damaged

in any way, a

claim

should

filed

with

the

carrier.

Afull

report

the

damage

should

obtained

the

claim

agent,

and

this

report

should

forwarded

us.

We will then

advise

you of

the

disposition

made

the

equipment

and

arrange

for

repair

replacement.

Include

model

number

and

serial

number

when

referring

this

instrument

for

any

reason.

2-3.

Hewlett-Packard

Company

warrants

each

in-

strument

manufactured

them

free

from

defects

material

and

workmanship.

Our

liability

under

this

warranty

limited

servicing

adjusting

any

in-

strument

returned

the

factory

for

that

purpose

and

replace

any

defective

parts

thereof.

Any

damage

the

instrument

upon

receipt

due

the

carrier.

File

claim

with

the

carrier

instructed

the

pre-

ceding

paragraph.

2-4.

SITE

SELECTION

AND

INSTALLATION.

2-5.

The

Model 722A

should

mounted

securely

rack.

environments

severe

vibration

the

rear

the

chassis

should

also

fastened

securely.

There

should

sufficient

space

the

rear

and along

the

sides

the

instrument

permit

free

flow of

cool

air

for

cooling.

This

instrument

will fit

any

standard

19-inch

rack

which

has

space

5-1/4

inches

high.

the

rack

not

accessible

from

the

rear,

plug

the

power

cable

before

sliding

instrument

into

rack.

Also

make

any

connections

the

rear

terminal

strip.

the

rack

accessible

from

the

rear,

these

con-

nections

may

made

any

time.

Secure

the

instru-

ment

the

rack

with

screws

and

cup-washers.

Con-

nect

the

power

cable

and

connections,

any, to

the

rear

terminals.

Connect

the

power

cable

the

power

source.

2-6.

LINE

POWER.

2-7.

The

three-conductor

power

cable

supplied

with

the

instrument

terminated

polarized,

three-

prong

male

connector

recommended

the

National

Electrical

Manufacturers'

Association

(NEMA).

WAR

ING

The

third

conductor

grounds

the

instrument

chassis

for

the

PROTECTIO

OPER-

ATING PERSONNEL. When

using

three-

prong

two-prong

adapter

ground

third

lead

(green

wire)

externally.

2-8.

OPERATION

FROM

230-VOLT

SUPPLY.

2-9.

This

instrument

may

used

with

either

115-

volt

230-volt

supply

with a

frequency

from

50 to

cps,

single-phase.

This

instrument

shipped

01155-1

from

the

factory

ready

for

operation

from

115-volt

source

unless

otherwise

indicated.

Operation

from

230-volt

supply

possible

by changing

jumper

con-

nections

by flipping a

switch

the

instrument

equipped with

the

lIS-volt

230-volt

switch

option.

change

the

jumpers

refer

the

schematic

for

details

(see

also

figure

5-5).

WAR

I G

Remove

the

power

cable

from

the

wall

re-

ceptacle

before

removing

the

dust

cover.

Dangerous

potentials

are

exposed

inside

the

instrument.

Replace

the

fuse

with

the

one

called

out

for

230-volt

operation

the

table

replaceable

parts

(section

VI).

2-10.

your

instrument

has

the

lIS-volt

230-volt

switch

option

the

input

voltage

may

changed

without

removing

the

instrument

from

the

rack.

First

turn

the

instrument

off

remove

the

power

cable.

Then

with a

pointed

tool,

such

the

point of a

pencil,

flip

the

lIS-volt

230-volt

switch

the

rear

apron

the

instrument

to 230

volts.

Replace

the

fuse

with

the

one

called

out

for

230-volt

operation

the

table

replaceable

parts

(section

VI).

2-11.

PREPARATION

FOR

STORAGE

AND

SHIPMENT.

2-12.

The

best

method

packing

the

instrument

the

original

shipping

carton

with

the

original

fillers

packed

the

same

manner

when

received

from

the

factory.

Therefore,

when unpacking note

carefully

the

method

of packing and

save

the

original

packing

material

for

possible

future

re-use.

2-13.

the

original

packing

material

not

available

and

desired

package

the

instrument

for

storage

shipment,

first

wrap

the

instrument

heavy

kraft

paper

avoid

scratching

the

paint.

Then

pack

cardboard

carton

with a

bursting

strength

least

150

per

square

inch.

Pad

the

instrument

all

sides

with

least

inches

rubberized

hair

least

inches

tightly

packed

excelsior.

2-14.

STORAGE.

2-15.

special

precautions

are

necessary

storage

except

the

usual

protection

against

mechanical

damage,

salt

air,

etc.

2-16.

INCOMING

INSPECTION

AND

PERFORMANCE

TEST.

2-17.

This

instrument

should

checked

soon

received

determine

that

its

electrical

character-

istics

have

not

been

damaged

shipment.

Refer

paragraphs

5-32

through

5-41.

2-1

Section

III

Figure

3-1

Model 722A

ovt~CUI"t(NT

<i!"

®®®

OUTPUT

CURRENT LIMIT +

1.0

0®j0

j.~.

POWER SUPPLY e

MOOR

r5j)

1ZZAR

HEWLETT PACKARD

Nl.OAlTO

(AUro

.....

Turn

POWER

switch

ON.

2. Adjust COARSE and FINE VOLTAGE

controls

until

the

voltage

the

OUTPUT

VOLTAGE

meter

of the

desired

value.

3. Adjust CURRENT LIMIT

control

until

the

pointer

indicates

current

value

some-

what

greater

than

the

expected

value.

Turn

POWER

switch

ON.

the

OUTPUT VOLTAGE

drops

when

POWER

turned

on,

the

current

limit

probably

being

exceeded.

Figure

3-1.

Operating

Controls

3-0

01155-1

Model 722A Section III

Paragraphs

3-1

3-11

SECTION

III

OPERATING

INSTRUCTIONS

3-1.

OPERATION.

3-2.

Refer

figure

3-1

for

complete

illustrated

description

all

operating

controls.

preliminary

adjustments

are

necessary

before

turning

this

in-

strument.

Connect

the

wires

from

the

load

the

output

terminals

either

the

front

back

the

in-

strument.

these

leads

are

long

run

past

source

interference,

twist

them

they

are

open-wire

leads

run

shielded

cable.

Figure

3-1

explains

step

how to

operate

this

instrument.

SENSE

-POWER

FRONT

REAR

+POWER

+SENSE

Figure

3-2.

Remote

Sensing

722A

1*2

O~----+lII~

~J----l

+0------

722A

3-10.

the

load

must

removed

with

the

supply

careful

where

you

break

the

leads

going

the

load.

Referring

figure

3-2

you

may

break

the

circuit

the

point(s)

marked

SW.

Do NOT

break

the

circuit

the

point(s)

marked

the

supply

will

damaged.

Figure

3-3.

Charging

Batteries

3-11.

this

supply

connected

active

load

(one which

supplies

voltage)

further

precautions

must

taken.

The

load

must

not

allowed

run

current

through

the

supply

the

reverse

direction.

WHEN

CONNECTI GTHIS

SUPPLY

ACTIVE

LOAD

ALWAYS

MAKE SURE THAT

THE

VOLTAGE

THE

MODEL 722A

SUPPLY

GREATER THAN

THE

VOLTAGE

THE

TERMINALS WHERE

THE

SUPPL

CONNECTED.

The

recommended

way of

protecting

the

supply

use

diodes.

Figures

3-3

and

3-4

illustrate

the

proper

way to

connect

these

diodes

when

connecting

this

supply

to a

battery

when

connecting

two

supplies

parallel.

These

diodes

must

able

carry

amperes

current

and

have

peak

inverse

voltage

greater

than 50

volts.

suitable

diode

may

ordered

from

Hewlett-Packard

stock

number

1901-0019.

3-3.

CURRENT

LIMITING.

3-4.

The

maximum

current

delivered

this

sup~ly

may

set

any

value

between

0.1 and 2

amperes.

This

will

limit

the

current

the

set

value

and

protect

the

equipment

under

test

addition

protecting

the

transistors

the

Model 722A

from

dissipating

too

much

power.

3-5.

Occasionally

when

the

current-limit

control

set

maximum

current

and

maximum

current

drawn

the

instrument

will not

adjust

down

later

smaiIer

current

limit.

this

case

switch

the

power

switch

OFF-RESET

position

momentarily

and then

back

ON.

The

instrument

will now

reset

and will

limit

lower

levels

current

limit.

3-8.

minimize

this

effect

separate

set

termi-

nals

for

the

sensing

voltage

provided

the

rear

the

instrument.

These

terminals

permit

separate

pair

leads

connect

the

load

to supply

the

sens-

ing

voltage.

These

leads

carry

load

curre~t.

but

are

actually

inside

the

regulating

loopof

the

amplIfIer.

3-9.

use

remote

sensing

run

separate

set

leads

from

the

load

the

supply.

These

leads

do not

need

heavy

the

supply

leads

but

they

must

protected

from

hum

pick-up.

Run

either

twisted

pair

open-wire

leads

shielded

leads

hum

pick-up

severe.

Connect

the

leads

the

terminals

marked

REM+ and

REM-

the

terminal

strip

on the

rear

the

instrument.

the

load

connect

these

leads

the

load

(see

figure

3-2).

3-6.

REMOTE

SENSING.

3-7.

When

the

Remote-Local

switch

on the

rear

the

instrument

the

Local

position

the

voltage

for

regulation

control

(sensing

voltage)

taken

off

the

output of

the

supply

the

front

panel.

This

not

always

the

best

point to

obtain

this

voltage

because

there

drop

the

supply

leads

between

the

load

and the supply.

CAUTION

sure

observe

polarity

when

making

these

connections.

Wrong

connections

may

damage

the

supply.

o---~~---o+

Figure

3-4.

Parallel

Operation

01155-1

3-1

'TjC/)

..... (D

t-i 0

.....

R29

100

SD-L-78B

100

S3B

R28

6.8

iT---i

I6 - I

I I

'_l

S4A !

REM

I0 : 0 +

REM

S4B

~J_~

REF

R51

R26

R40

\\\

R25

R33

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CURRENT

LIMITER

REFERENCE

I I I !

SUPPLY

0148015

ICURRENT 1

LIMIT

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SKI

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TCI4

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R5A

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R32

0."

200

SIB 0

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R31

800

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POWER

(

CRI2

115V.

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Figure

4-1.

Simplified

Schematic

-.....)

This manual suits for next models

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