HP 722A, 722AR Operating And Service Manual

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HEWLETT-PACKARD

COMPA

Y

01155·1

OPERATING

AND

SERVICE

MANUAL

MODEL

722A/AR

SERIALS

PREFIXED:

105-

DC

POWER

SUPPLY

Copyright

HEWLETT.PACKARD

COMPANY

1961

1501

PAGE

Mill

ROAD.

PALO

ALTO,

CALIFORNIA,

U.S.A.

P

rioted:

NOY

1961

Model 722A

TABLE

OF

CONTENTS

Table

of Contents

ListofIllustrations

and

Tables

Section

,Page

V

MAINTENANCE

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

I GENERAL INFORMATION

....

1-1

1- 1.

Introduction

. . . . . 1- 1

1-4.

Description

. . . . .

1-1

1-8.

DifferencesinEquipment

. .

..

1-1

1-10.

Equipment

Supplied . . . .

1-1

1-12.

Other

Modes of

Operation

.

1-1

II

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

IV

PRINCIPLESOFOPERATION

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

VI

REPLACEABLE

PARTS

6

-1.

Introduction

. . .

6-5.

Ordering

Information

. .

6-1
6-1
6-1

01155-1

LIST

OF

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

4

-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

OF

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
3-1
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
5-5

6-2
6-6

iii

Section I
Table

1-1

Model 722A

Table

1-1.

Specifications

RATED OUTPUT: o

to60volts

dc; 0to2

amperes

dc

LINE REGULATION:

Less

than 2.5

mv

change

for±10%

line

voltage

change; output

set

between 0to60

volts

LOAD REGULATION:

Less

than 5mvchangeatoutput

terminals

for0to2amperes

change;

output

set

between 0 and 60

volts

TRANSIENT RECOVERY TIME:

Less

than 20011sec

for

recovery

within 5mvforachange

from

0

to

full

loadorfull

loadto0atany

rated

outputorline

voltage

NOISE

AND

RIPPLE:

Less

than 25011v

rms

TEMPERATURE

STABILITY:

Better

than

0.02%jOC

or5mv

JOC,

whicheverislarger

TEMPERATURE

RANGE:

o

to

550for

operation

within

specifications

OUTPUT IMPEDANCE:

DC:

Less

than 2.5

milliohms

AC:

Less

than 5

milliohmsinseries

with 10

Ilh

OUTPUT METERS:

Voltage: 0

to60volts,

one

range

Current:

0to2.5 amp, one

range

PROTECTION:

Output

current

limiter

continuously

adjustable

from

100 rnato2.2 a

COOLING:

Forced

air

Iii

~

I~

it

16

:E'

---.t

a

f

I'

",,~!I·J

SIDE

4ii

5~

t

t

I

19

..

722AR

Rack

Mount:

DIMENSIONS:

WEIGHT:

Rack

Mount: Net 34

lb

POWER:

115

or

230

volts±10%,50to60cps,

40to250

watts

depending on

line

and

load

conditions

1-0

01155-1

Model 722A

SECTION

I

GENERAL

INFORMATION

Section I

Paragraphs

1-1to1-13

1-1.

INTRODUCTION.

1-2.

Thisisan

operating

and

service

manual

for

the

Model 722A

DC

Power

Supply.

This

manualisappli-

cable

onlytoinstruments

with

the

prefix

shown on

the

front

cover

exceptasmodifiedbychange

sheets.

1-3.

Hewlett-Packard

instruments

useatwo-section

eight-digit

serial

number,

that

is,

000-00000.

The

first

three

digits

are

an

identification

number;

the

last

five

digits

are

the

instrument

serial

number.

If

the

identification

number

on

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

in

manual

change

sheets

having

the

proper

identification

number.

1-4.

DESCRIPTION.

1-5.

The

C€tJ

Model 722A

DC

Power

Supplyisa

com-

pletely

transistorized,

regulated

power

supply.

It

will

supplyupto60voltsat2

amperes

with continuous

adjustmentofvoltage

and

current

limiting.

The

cur-

rent

limit

c~n

be

setatany

current

between 100

ma

and2amperes

to

protect

circuit

elements,

such

as

transistors,

under

test.

1-6.

Two

meters

measure

both

current

and

voltage

drawnbythe

load

continuouslysothat

you

may

monitor

power

supply

drain

conveniently.

The

output

impedance

is

low

for

both dc and

ac

so

thataminimumofde-

couplingisrequiredincascaded

circuits.

Terminals

for

remote

sensing

are

provided

on

the

rearofthe

chassis

so

that

the

ohmic

resistance

of

the

supply

leadsisminimized.

1-7.

The

usefulnessofthe

Model 722Aisnot

limited

to

transistor

applications,

but

is

useful

wherever

high

stabilityisrequired.

For

instance,

Model 722A

is

an

excellent

source

for

regulating

the

filament

voltageofvacuum

tubes.

1-8.

DIFFERENCES

IN

EQUIPMENT.

1-9.

This

manual

has

been

written

and

illustrated

for

the

Model 722AR

(rack-mounted

instrument)

since

this

is

the

only

styleofinstrument

availableatthe

time

of

writing.Acabinet-mount

model

may

become

avail-

ableinthe

future.

This

manual

will

also

applytothe

electrical

details

of

the

cabinet-mounted

model

even

though

the

physical

configuration

may

be

different.

1-10.

EQUIPMENT

SUPPLIED.

1-11.

The

equipment

supplied

consists

of only

the

Model 722A

DC

Power

Supplyasthis

supplyiscom-

pleteinitself.

1-12.

OTHER

MODES

OF

OPERATION.

1-13.

Two

Model 722A's

maybeconnectedinseries

for

greater

voltage.

Do not

connect

more

than two

722A'sinseries.

Refertosection

III

for

instructions

before

attemptingtooperate

these

suppliesinparallel.

01155-1

Figure

1-1.

Model 722AR

DC

Power

Supply

1-1/1-2

Model 722A

SECTION

II

PREPARATION

FOR

USE

Section

II

Paragraphs

2-1to2-17

,i

2-1.

UNPACKING

&

MECHANICAL

INSPECTION.

2-2.

Inspect

instrument

for

signsofdamage

incurred

in

shipment.

This

instrument

should

be

tested

as

soonasitisreceived.Ifit

failstooperate

properly,

or

is

damaged

in any way, a

claim

shouldbefiled

with

the

carrier.

A full

reportofthe

damage

should

be

obtainedbythe

claim

agent,

and

this

report

should

be

forwarded

to

us.

We will then

advise

you of

the

dispositiontobe

madeofthe

equipment

and

arrange

for

repair

or

replacement.

Include

model

number

and

serial

number

when

referringtothis

instrument

for

any

reason.

2-3.

Hewlett-Packard

Company

warrants

each

in-

strument

manufacturedbythemtobe

free

from

defects

in

material

and

workmanship.

Our

liability

under

this

warranty

is

limitedtoservicingoradjusting

any

in-

strument

returnedtothe

factory

for

that

purpose

and

to

replace

any

defective

parts

thereof.

Any

damage

to

the

instrument

upon

receiptisduetothe

carrier.

Fileaclaim

with

the

carrier

as

instructedinthe

pre-

ceding

paragraph.

2-4.

SITE

SELECTION

AND

INSTALLATION.

2-5.

The

Model 722A

shouldbemounted

securely

in

a

rack.

In

environmentsofsevere

vibration

the

rear

of

the

chassis

should

alsobefastened

securely.

There

shouldbesufficient

space

to

the

rear

and along

the

sidesofthe

instrumenttopermit

free

flow of

cool

air

for

cooling.

This

instrument

will fit

any

standard

19-inch

rack

which

hasaspace

5-1/4

inches

high.

If

the

rack

is

not

accessible

from

the

rear,

plug

the

power

cableinbefore

sliding

instrument

into

rack.

Also

make

any

connectionstothe

rear

terminal

strip.

If

the

rackisaccessible

from

the

rear,

these

con-

nections

maybemadeatany

time.

Secure

the

instru-

menttothe

rack

with

screws

and

cup-washers.

Con-

nect

the

power

cable

and

connections,ifany, to

the

rear

terminals.

Connect

the

power

cabletothe

power

source.

2-6.

LINE

POWER.

2-7.

The

three-conductor

power

cable

supplied

with

the

instrument

is

terminated

inapolarized,

three-

prong

male

connector

recommended

by

the

National

Electrical

Manufacturers'

Association

(NEMA).

WAR

ING

The

third

conductor

grounds

the

instrument

chassis

for

the

PROTECTIO

OF

OPER-

ATING PERSONNEL. When

usingathree-

prongtotwo-prong

adapter

ground

third

lead

(green

wire)

externally.

2-8.

OPERATION

FROM

230-VOLT

SUPPLY.

2-9.

This

instrument

maybeused

with

eithera115-

volt

or

230-volt

supply

with a

frequency

from

50 to

60

cps,

single-phase.

This

instrument

is

shipped

01155-1

from

the

factory

ready

for

operation

froma115-volt

source

unless

otherwise

indicated.

Operation

from

a

230-volt

supplyispossible

by changing

jumper

con-

nections

or

by flipping a

switchifthe

instrument

is

equipped with

the

lIS-volt

to

230-volt

switch

option.

To

change

the

jumpers

refer

to

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

operationinthe

tableofreplaceable

parts

(section

VI).

2-10.Ifyour

instrument

has

the

lIS-voltto230-volt

switch

option

the

input

voltage

maybechanged

without

removing

the

instrument

from

the

rack.

First

turn

the

instrument

offorremove

the

power

cable.

Then

with a

pointed

tool,

suchasthe

point of a

pencil,

flip

the

lIS-volt

to

230-volt

switch

on

the

rear

apron

of

the

instrument

to 230

volts.

Replace

the

fuse

with

the

one

called

out

for

230-volt

operationinthe

table

of

replaceable

parts

(section

VI).

2-11.

PREPARATION

FOR

STORAGE

AND

SHIPMENT.

2-12.

The

best

methodofpacking

the

instrument

is

in

the

original

shipping

carton

with

the

original

fillers

packedinthe

same

manneraswhen

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.Ifthe

original

packing

materialisnot

available

anditis

desiredtopackage

the

instrument

for

storage

or

shipment,

first

wrap

the

instrumentinheavy

kraft

papertoavoid

scratching

the

paint.

Then

packina

cardboard

carton

with a

bursting

strengthofat

least

150

lb

per

square

inch.

Pad

the

instrumentonall

sides

withatleast2inchesofrubberized

hairorat

least4inchesoftightly

packed

excelsior.

2-14.

STORAGE.

2-15.

No

special

precautions

are

necessaryinstorage

except

the

usual

protection

against

mechanical

damage,

salt

air,

etc.

2-16.

INCOMING

INSPECTION

AND

PERFORMANCE

TEST.

2-17.

This

instrument

shouldbecheckedassoonasit

is

receivedtodetermine

that

its

electrical

character-

istics

have

not

been

damagedinshipment.

Refer

to

paragraphs

5-32

through

5-41.

2-1

Section

III

Figure

3-1

Model 722A

~

~

'"

0

o

ovt~CUI"t(NT

<i!"

0

@

@

®

®

®

OUTPUT

CURRENT LIMIT

+

1.0

Q

0

®

j

0

j

.~.

®

,-

POWER SUPPLY

e

MOOR

r5j)

1ZZAR

HEWLETT PACKARD

Nl.OAlTO

(AUro

.....

,.

3

1.

Turn

AC

POWER

switch

ON.

2. Adjust COARSE and FINE VOLTAGE

controls

until

the

voltageonthe

OUTPUT

VOLTAGE

meterisof the

desired

value.

3. Adjust CURRENT LIMIT

control

until

the

pointer

indicatesacurrent

value

some-

what

greater

than

the

expected

value.

4.

Turn

DC

POWER

switch

ON.

If

the

OUTPUT VOLTAGE

drops

whenDCPOWERisturned

on,

the

current

limit

is

probably

being

exceeded.

Figure

3-1.

Operating

Controls

3-0

01155-1

Model 722A

Section III

Paragraphs

3-1to3-11

SECTION

III

OPERATING

INSTRUCTIONS

3-1.

OPERATION.

3-2.

Refer

to

figure

3-1

foracomplete

illustrated

descriptionofall

operating

controls.

No

preliminary

adjustments

are

necessary

before

turningonthis

in-

strument.

Connect

the

wires

from

the

loadtothe

output

terminals

eitherinthe

frontorbackofthe

in-

strument.Ifthese

leads

are

longorrun

pastasource

of

interference,

twist

them

if

they

are

open-wire

leads

or

runashielded

cable.

Figure

3-1

explains

stepbystep

how to

operate

this

instrument.

-

SENSE

-POWER
SW

FRONT

RL

REAR

OR

REAR

SW

+POWER

+SENSE

RO

Figure

3-2.

Remote

Sensing

722A

1*2

CR

CR

-

O~----+lII~

~J----l

J

+0------

RO

722A

722A..,

3-10.Ifthe

load

mustberemoved

with

the

supply

on

be

careful

where

you

break

the

leads

goingtothe

load.

Referringtofigure

3-2

you

may

break

the

circuitatthe

point(s)

marked

SW.

Do NOT

break

the

circuitatthe

point(s)

marked

X

as

the

supply

will

be

damaged.

Figure

3-3.

Charging

Batteries

3-11.Ifthis

supplyistobeconnectedtoan

active

load

(one which

supplies

voltage)

further

precautions

must

be

taken.

The

load

must

notbeallowedtorun

current

through

the

supplyinthe

reverse

direction.

WHEN

CONNECTI G THIS

SUPPLY

TOANACTIVE

LOAD

ALWAYS

MAKE SURE THAT

THE

VOLTAGE

OF

THE

MODEL 722A

SUPPLYISGREATER THAN

THE

VOLTAGE

ON

THE

TERMINALS WHERE

THE

SUPPLYIS

TOBECONNECTED.

The

recommended

way of

protecting

the

supplyisto

use

diodes.

Figures

3-3

and

3-4

illustrate

the

proper

way to

connect

these

diodes

when

connecting

this

supply

to a

battery

or

when

connecting

two

suppliesinparallel.

These

diodes

must

be

abletocarry2amperes

current

and

have

a

peak

inverse

voltage

greater

than 50

volts.Asuitable

diode

maybeordered

from

Hewlett-Packard

as

stock

number

1901-0019.

3-3.

CURRENT

LIMITING.

3-4.

The

maximum

current

delivered

by

this

sup~ly

may

be

settoany

value

between

0.1 and 2

amperes.

This

will

limit

the

currenttothe

set

value

and

protect

the

equipment

under

testinadditiontoprotecting

the

transistors

in

the

Model 722A

from

dissipating

too

much

power.

3-5.

Occasionally

when

the

current-limit

control

is

set

to

maximum

current

and

maximum

current

is

drawn

the

instrument

will not

adjust

down

later

to

a

smaiIer

current

limit.Inthis

case

switch

the

power

switchtoOFF-RESET

position

momentarily

and then

back

ON.

The

instrument

will nowbereset

and will

limitatlower

levelsofcurrent

limit.

3-8.

To

minimize

this

effectaseparate

setoftermi-

nals

for

the

sensing

voltageisprovidedonthe

rear

of

the

instrument.

These

terminals

permitaseparate

pairofleadstoconnectatthe

load

to supply

the

sens-

ing

voltage.

These

leads

carry

no

load

curre~t.

but

are

actually

inside

the

regulating

loopof

the

amplIfIer.

3-9.

To

use

remote

sensing

runaseparate

set

of

leads

from

the

loadtothe

supply.

These

leads

do not

needtobeasheavyasthe

supply

leads

but

they

must

be

protected

from

hum

pick-up.

Run

either

twisted

pair

open-wire

leadsorshielded

leadsifhum

pick-up

is

severe.

Connect

the

leadstothe

terminals

marked

REM+ and

REM-onthe

terminal

strip

on the

rear

of

the

instrument.

At

the

load

connect

these

leads

to

the

load

(see

figure

3-2).

3-6.

REMOTE

SENSING.

3-7.

When

the

Remote-Local

switch

on the

rear

of

the

instrumentisin

the

Local

position

the

voltage

for

regulation

control

(sensing

voltage)istaken

off

the

output of

the

supplyatthe

front

panel.

Thisisnot

always

the

best

point to

obtain

this

voltage

because

there

isadropinthe

supply

leads

between

the

load

and the supply.

CAUTION

Be

sure

to

observe

polarity

when

making

these

connections.

Wrong

connections

may

damage

the

supply.

+

o---~~---o+

RO

Figure

3-4.

Parallel

Operation

01155-1

3-1

~

I

o

'TjC/)

..... (D

~

8.

t-i 0

(D

~

~-

,<

.....

R29

100

SD-L-78B

~

100

S3B

o

R28

6.8

iT---i

I 6 - I

I I

~

'_l

M2

S4A !

REM

:

~*

:

-=

1

I 0 : 0 +

~

:

REM

S4B

~J_~

__

J

v

OV

REF

R51

R26

\

R40

\

10

\

\

\

R25

R33

.015*

CURRENT

LIMITER

04

REFERENCE

I I I !

SUPPLY

0148015

~

I

CURRENT 1

LIMIT

"fo

SKI

J..C138

~

TCI4

~

" I

1

I"

R5A

:..J-O----

~

I

1

-<>---y

I

~

I

I

I

III

R32

10

R3

d

0."

200

SIB 0

--1-- _

CRI6

R31

800

>

Cf1

~

(IISV

~

. .

~

~

0

~~3.P~(_

--I~--

I

l--

--

\ I

AC

POWER

(

CRI2

115V.

~

--0--

o

.....

.....

CJ1

CJ1

I

.....

Figure

4-1.

Simplified

Schematic

3:

o

0-

~

-.....)

N

N

:>

Model 722A

SECTION

IV

PRINCIPLES

OF

OPERATION

Section

IV

Paragraphs

4-1to4-4

"

4-1.

OVERALL

BLOCK

DIAGRAM.

4-2.

Referring

to

figure

4-2,

block

diagram,

note

that

the

power-line

voltage

passes

throughapower

transformer,

a

variable

transformer,

and thentoa

bridge

rectifier

circuit.

The

COARSE VOLTAGE

control

varies

the

voltage

from

the

variable

voltage

transformer

delivered

to

the

bridge

rectifier.

The

rectifiedacfrom

the

rectifierisfiltered

and

supplied

to

the

series

regulator.

The

current

goes

through

the

series

regulatortothe

load.Avoltmeter

across

the

output andanammeter

in

series

with

the

output

monitors

the

direct

voltage

and

current

fedtothe

load.

Current

and

voltage

sampling

circuits

feed

the

current

limiter.

The

current

limiter

enables

the

operator

to

set

the

maximum

current

the

Model 722A will

deliver

to

the

loadtoany

value

between

0.1

amp

and 2.0

amps.

The

current

limiter

also

serves

to

limit

the

maxi-

mum

power

dissipated

in

the

series

regulator

to

a

safe

value.

The

amplified

dc

voltage

changeatthe

outputisappliedasa

voltagetothe

series

regulators

which

tendstocounteract

the

change

in output

voltage.

The

reference

power

supply

furnishes

constant

volt-

ages

which

are

used

throughout

the

instrument

for

reference

and

supply

purposes.

Terminals

are

pro-

vided

for

remote

sensing

so

the

sensing

voltage

can

be

connectedtothe

output

externally.

Note

In

discussions

that

follow,

the

positive

side

of

the

output

voltageisconsidered

circllit

ground.

4-3.

RECTIFYING

AND

FILTERING

CIRCUITS.

4-4.

Referringtofigure

4-1

note

that

alternating

cur-

rentisfed

through

a conventional

power

transformer

Tl

intoavariable

autotransformer

T2.

The

purpose

of

T2isto

keep

the

voltage

across

the

series

regu-

lators

Q1

and

Q2

more

or

less

constant

regardless

of

the

output

voltage.

Transformer

T2isganged with

the

output

voltage

control

(COARSE VOLTAGE) R25.

If

the

output

voltage

were

reduced

toa low

value

with-

out

reducing

the

input

voltagetothe

voltage

regulator,

excessive

power

would

havetobe

dissipated

in the

transistors

of

the

series

regulatoratmaximum

output

current.

By

the

use

of a

variable

autotransformer·

this

dissipationiskepttoacceptable

values.

TI
POWER
TRANS-

FORMER

T2

VARIABLE

TRANSFORMER

VOLTAGE

SAMPLING

POINT")

SERIES

REGULATOR

CURRENT

SAMPLING

POINT)

RIB

AC
IN

CURRENT-

POWER

LIMITER

OUTPUT

j

L...---------+---------------_

.........

--+--0+

01155-1

REFERENCE

SUPPLY

Figure

4-2.

Block

Diagram

BD-L-Z47B

LOCAL

I

iL-

l f

L...-_;'-'

OREMOTE

SENSING

REMOTEU.

4-1

Section

IV

Paragraphs

4-5to4-17

4-5.

Alternating

current

from

the

autotransformer

is

rectified

inabridge

rectifier

CRI-4.

The

output

of

the

bridgeisa

full-wave

rectifiedacvoltage.

This

voltageisfiltered

by the

large

capacitor

C1.

Thus

the

voltage

supplied

to the

series

regulatorisalmost

pure

direct

current.

4-6.

SERIES

REGULATOR.

4-7.

The

series

regulator

consists

of two

transistors

in

series,

one of whichisdrivenbythe

series

regu-

lator

driver

Q3.

The

other

transistor

is

driven

by

Q11,

the

third

stage

in

the

amplifier.

The

action

of

these

circuitsisexplainedinparagraphs

under

these

titles.

4-8.

OUTPUT

CIRCUIT.

4-9.

Resistor

R18isconnected

between

the

output of

the

series

regulator

and

the

negative

output

terminal.

An

ammeter

connected

across

R18iscalibrated

to

read

the

current

to

the

load.

Voltmeter

M2iscon-

nected

across

the output and

reads

the

output

voltage.

The

outputisavailable

on

the

front

panel

terminals

and on

the

rear

terminal

strip

for

remote

application.

4-10.

VOLTAGE

REGULATING

CIRCUIT.

4-11.

The

voltage

regulating

circuit

consists

of

the

FINE VOLTAGE

adjustment

R24

(refertofigure

4-1),

the

COARSE VOLTAGE

adjustment

R25,

the

amplifier

circuit

(QI3, Q12 and Q11 and

associated

circuitry)

and

the

series

regulator

Q2.

The

diode

limiters,

CR20 and CR21,

limit

the

input to

the

amplifierinboth

the

positive

and

negative

directions.

Consider

what

happens

when

the

output

voltage

drops.

This

drop

may

be

a slow

shift

in output

voltageoranacsignalonthe

output.

AC

signals

are

fed to

the

amplifier

through

C5 and R40.

This

low-impedance

path

increases

the

loop

gain

foracsignals.

When the

voltage

on the

base

of Q13

(see

figure

4-3)

becomes

more

positive

(less

negative

as

when

the

output of

the

supply

drops)

Q13

draws

more

base

current

since

the

emitter-base

bias

is

increased

(Q13

isanpn-type

transistor).

This

signal

is

amplified

and

reversed

in

phase.

When

coupled

to

Q12,

this

reversed

signal

again

causes

more

current

to flow

since

the

forward

biasisagain

increased

(Q12isa

pnp-type

transistor).

4-12.

Diodes CR18 and CR19

are

zener

diodes

which

provide

direct

coupling

between

the

stages

in

the

amplifier

and

maintain

proper

collector

voltages

on

the

transistor

elements.

These

diodes

are

keptinthe

zener

breakdown

condition by

the

currents

flowing

in

resistors

R35, R36, R38, and R39.

The

signal

is

amplified

and

invertedinQ12.

Capacitor

CIS,

in-

ductance

Ll

and

resistor

R31inthe

emitter

circuit

of Q12

help

stabilize

the

loop.

The

emitter

of Q12

is

connected

through

these

components

toa point which

is

separated

from

the

positive

output

terminalbyre-

sistor

R33.

Load

current

through

this

resistor

injects

current

feedback

into

the

loop which

improves

the

load

regulation.

The

inverted

signal

from

Q12

tends

to

4-2

Model 722A

reduce

the

base

currentinQ11(apnp-type

transistor).

The

signalisamplified

and

inverted

in Q11and fed to

the

base

of Q2.

This

signal

tendstoincrease

the

current

through

Q2

(another

pnp-type

transistor).

Increasing

the

current

throughQ2increases

the

volt-

age

out of

the

supply.

Since

the

original

action

was

a

decrease

in

voltage

this

action

will tend to

restore

the

original

conditions,

regulating

the

supply.

4-13.

The

dc

output

voltage

is

set

by

varying

the

COARSE and FINE VOLTAGE

controls

R24 and R25.

In

explaining

this

circuit,

resistor

R51

canbethought

of

asaconstant-current

source.

Mostofthis

cur-

rent

normally

flows out

through

R24 and R25tothe

series

regulator

with only an

insignificant

amount

going to

the

base

of Q13.

Thusasthe

resistance

of

R24 and R25

is

increased

the

voltageonthe

negative

output

lead

will go

further

negative

since

the

constant

current

through

these

resistors

will develop a

greater

voltage

drop.

4-14.

CURRENT-POWER

LIMITER.

4-15.

Transistor

Q4

plus

associated

circuitry

forms

a

protective

circuit

which

limits

the

current

and

power

dissipationinthe

series

regulators

and

load.

Refer-

ringtofigure

4-3,nocurrent

flows throughQ4under

normal

conditions

since

the

baseisbiased

positive

with

respect

to

the

emitter.

The

maximum

current

available

for

the

baseofQ2isfixed by

the

resistors

RIO

and

Rll

and

the

reference

supply.

Normally,

the

current

not

usedbythe

baseofQ2

to supply a

certain

load

current

passes

through

the

collector

of

Ql1.

4-16.

When

the

instrumentisin

the

current-limiting

condition,itis

essentiallyaconstant-current

supply

rather

than a

voltage

supply.

The

voltage

derived

across

R18iscoupledtothe

baseofQ4

through

CR8

and R14. As the

load

current

increases,

this

voltage

increasestoa

level

where

Q4

beginstoconduct.

Any

attempttoincrease

the

load

current

further

merely

turns

Q4

on

harder,

depriving

Q2ofthe

necessary

base

currenttosustain

this

larger

load

current.

This

action

tendstokeep

the

load

current

constant.

Since

the

output

voltageisbelow

the

desired

output

voltage

in

the

current-limiting

condition,

the

amplifier

turns

off

Ql1.

With

Q11

turned

off

the

only

paths

for

the

current

through

RIO and R11

are

into

the

baseofQ2

and

the

collector

of Q4.

4-17.

Referring

to

figure

4-3,asthe

load

resistance

is

further

decreased

the

output

voltage

decreases

since

the

currentisheld

constant.

This

tendstoin-

crease

the

voltage

across

the

series

regulator.

When

this

voltage

reachesacertain

value,

the

zener

diode

CR6 will

start

to conduct.

This

current

appears

to

Q4tobe

duetoincreasing

load

current

andQ4tends

to

conduct

more

current

away

from

the

baseofQ2

thus

decreasing

the

load

current

and

limiting

the

maximum

dissipation

in

the

series

elements.

Diode CR8

acts

as

a 0.7 volt

battery

sinceitis

forward

biasedatall

times

by

the

current

through

R12.

Resistor

R14

ad-

justs

the

lower

limitofthe

current

limit

range

while

R20

adjusts

the

upper

limit.

The

CURRENT LIMIT

potentiometer

R5

adjusts

the

current

limittoany

value

between

the

upper

and

lower

current

limits.

01155-1

•

Model 722A Section

IV

Paragraphs

4-18to4-20

!

V

c

FROM

RI8

-

----+

RECTIFIERS

Q2

RSA

R7

+

RI2

CI

LOAD

R33

FROM

+

--+

-..>----

.......

..JI,/I"f'y---

....

RECTIFIERS

CIS

LI

R37

RSI

50-11-868

+

Figure

4-3.

Current

Power

Limiter

4-18.

PROTECTION

CIRCUITS.

4-19.

Referring

to

the

schematic

in

the

backofthe

manual,

note

that

relay

Klisshowninthe

normal

energized

position.

When

the

instrument

is

turned

off,

orifthe

power

fails,

the

relay

will

returntothe

opposite

position

immediately.

The

center

contacts

of

the

relay

Kl

on

the

schematic

then apply a fixed

positive

biastothe

baseofQ2

tendingtoturnitoff.

If

this

were

not done

the

output

voltage

would

have

a

transient

impressed

uponitduetothe

fact

that

the

amplifier

loses

controlofthe

series

elements

faster

than

the

large

input

capacitor

C1

canbedischarged

through

R3. Note

that

the

relay

switchesR3across

Cl

when a

power

failure

occurstohelp

discharge

Cl.

4-20.

When

the

instrumentisfirst

turnedonthe

relay

Kl

is

in

the

opposite

positiontothat

showninthe

schematicatthe

end of

this

manual.

The

voltage

applied

01155-1

to

the

coil

of

Kl

must

first

charge

capaCitorsC13

and C14

through

R31

before

the

relay

coil

becomes

energized.

When

these

capacitors

charge

up,

the

relay

coil

will

become

energized

and

the

relay

contacts

will

switch,

providingatime-delayinturn-on.

The

top

setofcontacts

switch

R2 out of

the

circuit.

This

resistance

is

used

during

the

initial

time-delay

period

to

limit

the

in-rush

of

current

through

the

bridge

rectifiers

CRI-4.

The

middle

setofcontacts

switch

the

baseofQ2

from

a fixed

positive

voltage

to

its

normal

operating

condition.

This

positi-ve

voltage

keeps

Q2

turned

off

during

the

initial

turn-on

delay,

giving

the

amplifier

time

so

its

voltages

can

reach

their

operating

levels

and

gain

controlofthe

feedback

loop.

This

action

will

prevent

output

voltage

transients

which

could

exceed

the

desired

output

voltage.

The

bottom

set

of

contacts

discharge

the

capacitors

C13

and C14

through

R32,

preparing

the

circuit

for

the

next

turn-on

cycle.

4-3

Section V

Table

5-1

Table

5-1.

Recommended

Test

Equipment

Model

722A

Instrument

Type

Required

Characteristics

Use

Instrument

Recommended

DC

Voltmeter

Accuracyof±

1%

Measure

voltages

Analog,

rfiJ

Model

412A/

AR

Digital,

1j;

Model

405A/B/C

AC

Voltmeter

Accuracyof±3%

Measure

ripple

~

Model403A

Floating

input

Battery

operated

Oscilloscope

5

mv-cm

sensitivity

Measure

ripple

peaks

~

Model 130B, 150A with
Model 151B

~

Model 160B/170A

with

Model 162D

Variable

Monitor

meter1volt

res-

Changeacinput

voltage

Superior

type UC1M

Transformer

olution

and

±1%

accuracy

Low-Heat

23-1/2

watt

element

Solder

printed

circuit

boards

Soldering

Iron

(

connect

ironto75 volt line)

Ungar

Model 776

Soldering

Iron

Handle

Ungar

Model 535

Heater

Element

Ungar

Model

PL333

Soldering

Iron

Tip

Stable Voltage

oise

and

ripple

less

than

Reference

voltagetotest

Another~Model 722A;

Source

250

microvoltat60

volts

regulation

45

volt

and 7

volt

battery

connectedinseries

Load

25

ohmsat150

watts

Load

for

measuring

ripple,

Any

resistor

or

combination

regulation,

etc.

of

resistors

of

suitable

value

(may

use

wirewound

resistors,

supply not

affectedbyin-

ducti

ve load)

Precision

1

ohm±1%,

5 watt

resistor

Measure

current

with

~

stock

number

0811-0040

Resistor

voltmeter

5-0

01155-1

Model 722A

SECTION V

MAINTENANCE

Section V

Paragraphs

5-1to5-18

5-1.

INTRODUCTION.

5-2.

This

section

contains

maintenance

and

service

information

for

the

Model 722A

DC

Power

Supply.

A

performance

checkisincludedatthe

end of

this

sectiontobe

usedtoverify

instrument

operation.

This

check

can

be

made

with

the

instrumentinits

cabinet

andisa good

testaspartofpreventive

maintenance

and

incoming

quality

control

inspection.

5-3.

MAINTENANCE

PROCEDURES.

5-4.

DUSTCOVER REMOVAL.

5-5.

Remove

the

eight

screws

(four

on top

and

four

below) holding

the

dustcoveronthe

instrument.

Pull

the

dustcover

from

the

instrument.

5-6.

ZERO-SETTING

THE

METER.

5-7.

The

meter

pointer

must

rest

on

the

zero

cali-

bration

markonthe

meter

scale

when

the

instrument

is

at

normal

operating

temperature,

resting

in

its

normal

operating

position,

and

the

instrument

is

turned

off.

To

zero-set

the

meter

proceedasfollows:

a.

Turn

on

instrument

and

allowitto

comeupto

normal

operating

temperature

(about 20

minutes).

b.

Turn

the

instrument

off. Wait two

minutes

for

power-supply

capacitors

to

discharge

completely.

c.

Rotate

adjustment

screwonfrontofmeter

clock-

wise

until

the

meter

pointeristo

the

leftofzero

and

further

clockwise

rotation

will

move

the

pointer

up-

scale

towards

zero.

d.

Turn

the

adjustment

screw

clockwise

until

the

pointerisexactly

over

the

zero

markonthe

scale.

If

the

screw

is

turned

too

far,

repeat

steps

c and d.

e.

Turn

meter

adjustment

screw

counterclockwise

about15degreestobreak

contact

between

adjustment

screw

and

pointer

mounting yoke, but not

far

enough

to

move

the

pointer

back

downscale.

If

screw

is

turned

too

far,asshown by

the

needle

moving,

repeat

the

procedure.

The

meter

is

now

zero-set

for

best

accuracy

and

mechanical

stability.

5-8.

PRINTED CIRCUIT BOARD REMOVAL.

CAUTION

Be

suretoturn

off

the

instrument

and allow

time

for

the

capacitorstodischarge

before

changing

the

printed

circuit

boards.

Do

not

attempt

to

operate

this

instrument

with any

of

the

printed

circuit

board

missing.

5-9.

The

printed

circuit

boards

are

heldinby being

plugged

into

sockets.

Since

these

sockets

have

many

01155-1

contacts

the

boardisheldinquite

firmly

withoutbeing

fastenedinany

other

way.

To

remove

these

boards

some

additional

help

maybeneeded.

Placeascrew-

driver

(right-angle

screwdriver

with

boards

A&:B)

under

the

end of

the

board

nearest

the

chassis

and

pry

up.

5-10.

TEST

EQUIPMENT

REQUIRED.

5-11.

Test

equipment

required

to

test

this

instru-

mentislisted

in

table

5-1.

The

necessary

specifi-

cations

requiredtotest

this

instrument

are

listed

so

that

other

equipment

with

equivalent

specifications

maybeused.

5-12.

PERFORMANCE

CHECK.

5-13.

Before

attemptingtotroubleshoot

this

instru-

ment

make

sure

the

faultiswith

the

instrument

and

not with

the

associated

circuit

under

test.

The

per-

formance

check

will

enable

youtodetermine

this

without

having

to

remove

the

instrument

from

the

cabinet.

BE

SURE TO

PERFORM

THIS

TEST

BE-

FORE

DISTURBING

ANY

OF

THE

INTERNAL AD-

JUSTMENTS OF

THE

INSTRUMENT.

This

test

may

also

be

used

as

an

incoming

inspection

testtomake

sure

the

instrument

has

not

been

damagedinshipment,

for

periodic

maintenance,

or

to

check

operation

of

the

instrument

after

repairs.

The

performance

test

willbefoundinparagraph

5-32.

5-14.

TROUBLESHOOTING.

5-15.

INTRODUCTION.

5-16.

Components

within

Hewlett-Packard

instru-

ments

are

conservatively

operatedtoprovide

maxi-

mum

instrument

reliability.

In

spiteofthis,

parts

within

an

instrument

may

faiL Usually,

the

instru-

ment

must

be

immediately

repaired

with a

minimum

of IIdown

time".

A

systematic

approach,

suchasis

given

later

in

this

section,

can

greatly

simplify

and

thereby

speedupthe

repair.

CAUTION

Be

careful

nottoshort

voltages

across

the

transistors.

Small

bias

changes

may

ruin

a

transistor

duetoexcessive

dissipation.

BE

SURE

TO

TURN

THE

INSTRUMENT

OFF

BEFORE

DOING

ANY

SOLDERING. A

small

leakage

current

from

the

soldering

iron

ap-

pliedatthe

input being

amplified

may

exceed

ratingsonthe

output

transistors.

5-17.

TROUBLE ANALYSIS.

5-18.

Some

systematic

troubleshooting

canbedone

with

this

instrument.

For

instance,ifthereisno

voltage

throughout

the

instrument

check

the

fuse

and
5-1

Section

V

Figure

5-1

REMOTE

- LOCAL

SWITCH

/S3

TERMINAL STRIP

FOR

230V

CONVERSION IF

UNIT

DOESN

T HAVE

115V-230V

SWITCH.

Model 722A

MP-S-894

5-2

Figure

5-1.

Model 722A

Bottom

View

01155-1

Model

722A

Section

V

Figure

5-2

1")1155-1

MP-S-895

Figure

5-2.

Model 722A

Top

View

5-3

Section V

Figure

5-3

SERVICING

ETCHED CIRCUIT BOARDS

Model 722A

Excessive

heat

or

pressure

can

lift

the

copper

strip

from

the

board.

Avoid

damagebyusing

a low

power

soldering

iron

(50

watts

maximum)

and

following

these

instructions.

Copper

that

lifts

off

the

board

should

be

cementedinplace

with a

quick

drying

acetate

base

cement

having good

electrical

insulating

properties.

A

breakinthe

copper

shouldberepairedbysolderingashort

lengthoftinned

copper

wire

across

the

break.

Use

only high

quality

rosin

core

solder

when

repairing

etched

circuit

boards.

NEVER USE PASTE

FLUX.

After

soldering,

clean

off

any

excess

flux

and

coat

the

repaired

area

with a high

quality

electrical

varnish

or

lacquer.

When

replacing

components

with

multiple

mounting

pins

suchastube

sockets,

electrolytic

capacitors,

and

potentiometers,itwill be

necessarytolift

each

pin

slightly,

working

around

the

components

several

times

untilitis

free.

WARNING:

If

the

specific

instructions

outlinedinthe

steps

below

regarding

etched

circuit

boards

without

eyelets

are

not followed,

extensive

damagetothe

etched

circuit

board

will

result.

1. Apply

heat

sparinglytoleadofcomponenttobe

replaced.

If

leadofcomponent

passes

through

an

eyeletinthe

circuit

board,

apply

heatoncom-

ponent

sideofboard.Ifleadofcomponent

does

not

pass

through

an

eyelet,

apply

heat

to

CQii':'

ductor

sideofboard.

3. Bend

clean

tinned

leads

on new

part

and

care-

fully

insert

through

eyeletsorholesinboard.

2.

Reheat

solder

in

vacant

eyelet

and

quickly

in-

sertasmall

awl to

clean

insideofhole.Ifhole

does

not

haveaneyelet,

insert

awl

or

a #57

drill

from

conductor

sideofboard.

4. Hold

part

against

board

(avoid

overheating)

and

solder

leads.

Apply

heattocomponent

leads

on

correct

sideofboard

as

explainedinstep

1.

:;:;:

::;:;:;:;:;:;:::;:;:::;:;

,',J

_:;;.-.:::;;0-'"

In

the

event

that

either

the

circuit

board

has

been

damagedorthe

conventional

methodisimpractical,

use

method

shown below.

Thisisespecially

applicable

for

circuit

boards

without

eyelets.

1.

Clip

leadasshown below.

~,--

....-..

:.:-

.....

-::..-

.....

--r-----~~~E

2. Bend

protruding

leads

upward. Bend

lead

of

new

component

around

protruding

lead.

Apply

solder

usingapairoflong

nose

pliers

as

a

heat

sink.

APPLY~

SOLDER

~~

This

procedure

is

usedinthe

field

onlyasan

alternate

meansofrepair.Itis

not

used

within

the

factory.

Figure

5-3.

Servicing

Etched

Circuit

Boards

5-4

01155-1

Model 722A

Section V

Paragraphs

5-19to5-21

CAUTION

Table

5-3.

Replacement

Guide

CR5

Regulation

CRl,

2, 3,or4

Line

fuse,

brush

and winding on

T2

Check

these

items:

All

transistors

and

diodesonthe

chassis

have

an

anodized

aluminum

washer

and

silicon

grease

be-

tween

the

transistor

and

the

chassis.

The

transis-

torsonthe

fan

heat-sink

have

grease

only. When

replacing

transistors

or

diodesbesuretoreplace

the

insulating

washer

(if any) and

the

silicon

grease

so

that

these

components

will

have

good

heat

conductiontothe

chassis.

Use

a good

grade

of

heat-conducting

grease,

suchasDow

Corning

silicon

grease

#3orCompound 5.

If

you change:

primary

circuit.

Transistors

QI-3

should

share

the

outP\lt

voltage(avoltage

drop

should

appear

across

each

of

these

transistors).

If

there

isnovoltage

drop

across

one of

these

transistors,itis

most

likely

shorted.

If

some

component

onanetched

circuit

boardissuspected

and

you

have

another

instrument

thatisfunctioning

properly,

substitute

the

board

con-

taining

that

component

from

the

good

instrument.

5-19.

The

circuit

consistingofthe

series

regulators

and

amplifiers

presentsadifficult

problem

for

sys-

tematic

trouble

analysis.

Thisisa

feedback

circuit

in

which a faulty

component

anywhere

will

affect

the

entire

loop. In

this

case

symptomatic

trouble

analysis

may

be

easier.

Refer

to

the

symptom

column

in

table

5-2,

Troubleshooting

Guide and

test

the

cor-

responding

transistor

or

diode.

If

you

havetore-

place

any

transistors

or

diodes

refer

alsototable

5-3,

Replacement

Guide

for

additional

tests

which

maybenecessary.

Table

5-2.

Troubleshooting

Guide

CR6

Current

limiting

Symptom

Blown

line

fuse

Check

-

CRl,

CR2, CR3, CR4,

CRI2,

CRI3, CRI4,

CRIS,

CRI6,

CR22, CR23,

shorted

winding

on T 1,orbrush

and winding

on

T2.

CR7

CR8

CR9
CRI0

Voltage CR7 (should be about

0.8

volts)

Current

limiting,

recalibrate

cur-

rent

limits

Current

limiting

Output C6

Poor

load

regulation

CR5, CR11,

CRI7,

Q2, Q4, Q11,

Q12, Q13, R33 and

S3

CRII

Load

regulation

and

transients

withdcswitching

1)

Loosen

fan by

removing

four

allen-head

screws

holding fan to

spacers.

Slide fantoone

side.

Note

Ql

and

Q2

are

locatedonthe

fan

heat-sink.

To

remove

these

transistors

proceedasfollows:

See

table

5-3,

Replacement

Guide,

for

additional

tests

which

maybenecessaryifyou

replace

the

above

components.

See

figure

5-3,

Servicing

Etched

Circuit

Boards.

Poor

current

limiting

CR6, CR8,

CRI7,

Q4, R9

CR12-16

CR17

CRI8,

19

Ql,2,or

3

Q4

Q11

Ripple,

voltage

output,

maximum

current,

relay

operation

Current

limiting,

transient

re-

sponsetoloading

Collector

voltage

on Q12

and

Q13

Check

for

voltage

drop

across

transistors;

regulationat103

volts

in, 60 volt to 2

amp

out

Current

limiting,

R14, R20

CRI7,

Q4, output voltage;

regu-

lationat127

volts

in, low output

voltage

5-20.

DETAILED

TEST

PROCEDURE.

5-21.

The

following

test

procedure

should

be

per-

formed

only

after

the

performance

test

(paragraph

5-32)

has

shown

that

this

instrumentisfaulty.

DO

NOT

PERFORM

THIS PROCEDUREASAN

INCOMING IN-

SPECTION

OR

PROOF OF PERFORMANCE CHECK.

The

specifications

for

your

instrument

are

given

in

2)

Unsolder

wires

going to

transistor.

Note

that

the

heavy

wire

goestothe

emitter

and

the

finer

wire

goestothe

base

(collectorisconnected

to

case).

3)

With a

wrench

remove

the

screw

holding

the

transistor.

Remove

transistor.

Installation

of a new

transistoristhe

reverse

of

the

above

procedure.

Be

sure

to note which

is

the

emitter

and which

is

the

base

pin

before

mounting

the

transistor.

Q12,

13

Voltage

control

and

regulation

01155-1

5-5

Section V
Paragraphs

5-22to5-35

the

frontofthis

manual

(table

1-1).

The

following

test

procedure

contains

extra

checks

to

help

you

analyze

the

troublesinthis

instrument.

These

extra

checks

and the

data

they

contain

cannotbeconsidered

as

specifications.

5-22.

Do not

perform

all

the

testsinthis

procedure.

Do only

those

tests

associated

with the

particular

sectionsofthe

instrument

showntobe

faulty by the

performance

test.

Indiscriminate

adjustmentofthe

internal

controlsto"refine"

the

settings

may

actually

cause

trouble.

5-23.

REFERE

CE

VOLTAGE ADJUSTME

T.

5-24.

To

set

the

reference

voltage

proceedasfollows:

a.

Connectavoltmeter,

suchasthe

r.5f;

Mode1405A/

B/C

across

C24

(reference

supply

filter

capacitor

on

board

A).

b. Adjust R48

(Reference

Voltage

Adjust

potentiom-

eter)

until

the

meter

reads

13.2 ± 0.2

volts.

c.

Remove

meter.

5-25.

MONITORI G.

5-26.

For

all

following

tests

(subparagraphs

5-27

and

5-29)

the

output

voltage

shouldbemonitored.

The

positive

output

terminal

of

the

Model 722Aiscon-

sidered

circuit

ground.

To

monitor

the

output

con-

nectavoltmeter,

such

as

the

r.5f;

Model

405A/B/C

as

follows:

a.

Turn

AC

and

DC

switchestoOFF.

Remote-

Local

switchonLocal.

b.

Turn

COARSE VOLTAGE

potentiometer

R25

fully

counterclockwise.

c.

Attach

voltmeter

to

the

output

terminals

(front

or

rear)

of

the

Model 722A "with

the

black

terminal

of

the

voltmeter

connectedtothe

red

(positive)

termi-

nal

of

the

Model 722A. (In

this

test

procedure

the

positive

side

of the Model 722A outputisconsidered

circuit

ground.)

5-27.

VOLTAGE RANGE.

5-28.

To

check

the

voltage

rangeofthe

Model 722A

proceedasfollows:

a.

Turn

the

AC

and DC POWER

switches

to

ON.

b.

Tum

the

COARSE and

FINE

VOLTAGE

controls

on

the

front

panel

fully

clockwise.

The

voltmeter

across

the

output

should

indicate

60.1to60.3

volts.

If

not,

adjust

R48.

c.

Turn

the

COARSE and FINE VOLTAGE

controls

on

the

front

panel fully

counterclockwise.

The

volt-

meter

across

the output

should

indicate

0.05 to 0.02

volt

(positive

terminalonthe

Model 722Aisconsidered

ground).
5-6

Model 722A

5-29.

CURRENT LIMIT.

5-30.Asimple

way to

measure

current

with a

volt-

meter

istouseaload

made

up of a 25 ohm, 150

watt

resistor

in

series

with a

precision

1%,1ohm,S

watt

resistor,

r.5f;

stock

number

0811-0040.

Connectavolt-

meter

in

shunt

with

this

precision

resistor.

In

the

following

procedure

the

term

shunt

voltmeter

will

be

used

to

distinguish

this

voltmeter

from

other

volt-

meters.
5-31.

To

adjust

the

current

limiting

proceedasfollows:

a.

Turn

the

DC

POWER

switchtoOFF.

b.

Connect

the

load

mentioned

above

the

OUTPUT

terminals.

c.

Connect

the

shunt

voltmeter

across

the1ohm

precision

resistor.

d.

Turn

the

DC POWER

switch

to 0 •

e.

Turn

the

CURRE T LIMIT

potentiometeronthe

front

panel

fully

clockwise

and

the

COARSE VOLTAGE

control

fully

counterclockwise.

f.

Turn

the

COARSE VOLT AGE

control

slowly

clockwise

until

the

current

appears

to

limit

(volt-

meter

on

panel

stops

rising).

The

voltageonthe

shunt

voltmeter

shouldbe2.3

volts.Ifnot,

adjust

R20.

g.

Adjust

the

COARSE and FINE VOLTAGE

control

until

the

shunt

voltmeter

reads

exactly

2.00

volts

(in-

dicating2amps

current).

h.

The

OUTPUT CURRENT

meter

should

read

exactly

2.00

amps.Ifnot,

adjust

Ammeter

Calibrate

potentiometer

(R16) until

the

OUTPUT CURRENT

meter

does

read

exactly

2.00

amps.

i.

Turn

COARSE VOLTAGE

control

until

the

output

voltageisabout 10

volts

and

tum

CURRENT LIMIT

control

fully

counterclockwise.

j.

The

voltage

on

the

shunt

voltmeter

should

be

0.08

volts

(0.08

amp)

or

less.

If

not, pad R13.

5-32.

PERFORMANCE

TEST.

5-33.

Before

attemptingtotroubleshoot

this

instru-

ment

make

sure

the

faultiswith

the

instrument

and

notinthe

associated

circuit

under

test.

This

proce-

dure

will

enable

youtodetermine

this

without having

to

remove

the

instrument

from

the

cabinet.

BE

SURE

TO

PERFORM

THIS

TEST

BEFORE

DISTURBING

A Y OF

THE

INTERNAL ADJUSTMENTS OF

THE

INSTRUMENT.

This

test

may

alsobeusedasin

in-

coming

inspection

testtomake

sure

the

instrument

has

not

been

damagedinshipment,

for

periodic

main-

tenance,

or

to

check

operation

of

the

instrument

after

repairs.

5-34.

VOLTAGE RANGE.

5-35.

To

check

the

voltage

range

proceedasfollows:

01155-1

Model 722A

a.

Connect

voltmeter

across

output of

power

supply.

b.

Turn

COARSE and FINE VOLTAGE

controls

fully

clockwise.

Voltage

out

shouldbegreater

than

60.0

volts.

c.

Turn

COARSE and

FINE

VOLTAGE

controls

fully

counterclockwise.

Output

voltage

should

go

through

zero

to

0.05to0.2

volts

positive

(positive

terminal

on Model 722A

is

considered

ground).

5-36.

CURRENT LIMITING.

5-37.

To

check

current

limiting

proceedasfollows:

a.

Connect

25 ohm, 150

watt

loadinseries

with a

precision

1%,

1 ohm, 5

watt

resistor,

to

the

output

of

the

Model 722A.

b.

Connectavoltmeterinshunt

with

the

precision

1 ohm

resistor.

This

voltmeter

willbecalled

the

shunt

voltmeter.

c.

Turn

CURRENT LIMIT

control

fully

clockwise.

d.

Turn

COARSE VOLTAGE

control

clockwise

until

current

appears

to

limit

(voltmeter

on

front

panel

stops

rising).

Shunt

voltmeter

should

read

2.3

volts.

e.

Adjust

the

COARSE

and

FINE VOLTAGE

con-

trols

until

shunt

voltmeter

reads

2.00

volts.

The

OUTPUT CURRENT

meter

should

read2amperes.

f.

Tum

COARSE VOLTAGE

control

for

10

volts

out

and

CURRE T LIMIT

control

fully

counterclock-

wise.

The

output

voltage

shouldbe0.08 voltorless.

5-38.

OPERATION CHARACTERISTICS.

a.

With

the

DC

POWER

switch

turned

off,

attach

a

well-shielded

coaxial

cable

between

the

OUTPUT

terminals

of

the

Model 722A

andanoscilloscope,

such

as

the

r5j)

Models

130B/150A with 151B

plug-in,

160B

or

170A with 162D

plug-in.

Itisabsolutely

essential

that

this

lead

be

as

well-shielded

and

as

short

as

possible.

Not only

must

this

leadbewell

shielded

butitalso

mustbeconnectedtothe

OUTPUT

terminals

as

close

to

the

instrument

as

possible.

Unscrew

the

plastic

ferrules

on

the

OUTPUT

con-

nectors

and

connect

bare

wire

or

clip-leads

tightly.

b.

Connectavoltmeter

and

load

as

instructed

in

paragraph

5-36,

Current

Limiting.

This

voltmeter

willbecalled

the

shunt

voltmeter.

c.

Turn

DC

POWERtoON

and

adjust

CURRENT

controls

for2amperes

current

(2

volts

on

shunt

voltmeter).

d.

Set

oscilloscope

for5mv

/cm

sensitivity

and a

sweep

speed

of 5

ms/cm.

e.

Plug

the

Model 722A into a

variable

transformer

and

reduce

the

input

voltage

until

the

output

ripple

reaches

at

least5mv

peak-to-peak.

This

voltage

shouldbeless

than 102

volts

ac.

01155-1

Section

V

Paragraphs

5-36to5-40

5-39.

RIPPLE

CHARACTERISTICS.

Note

The

instrument

under

test

must

notbelying

on

magnetic

material

for

this

test.

a.

Connectavoltmeter

and

loadasinstructed

in

paragraph

5-36,

Current

Limiting.

This

voltmeter

will

be

called

the

shunt

voltmeter.

b.

Connect

an

oscilloscope

as

instructedinpara-

graph

5-38,

Operation

Characteristics.

c.

Connect

a floating,

battery-operated

voltmeter,

suchasthe

r5j)

Model 403A,tothe

OUTPUT

terminals

of

the

Model 722A with a

short

shielded

lead.

d.

Turn

up

the

COARSE VOLTAGE

control

until

the

shunt

voltmeter

reads2volts(2amps

current).

e.

Read

the

ripple

voltageonthe

Model 403A.

This

voltage

shouldbeless

than 150

microvolts

rms.

The

peak-to-peak

voltage

measured

on

the

oscilloscope

should

be

less

than

1.0

millivolt.

If not,

make

sure

the

REMOTE-LOCAL

switch

on

the

rear

of

the

in-

strumentison LOCAL.
5-40.

LOAD REGULATION.

a.

With

the

Model 722A

connectedasin

paragraph

5-39,

Ripple

Characteristics,

tum

the

DC

POWER

switch

off and

disconnect

the

load.

Note

In

this

test

we

wish

to

measure

voltages

within 3

millivolts.

The

resolution

of

the

Model 405

Voltmeterisnot

sufficienttomea-

sure

this

smallavoltageatthe

full output

voltage.

For

this

reason

we will

buck-out

almost

allofthe

output

voltage

with a

stable

voltage

source,

suchasanother

Model 722A,

and

then

measure

only

the

difference

voltage

with high

resolution.

b.

Connect

the

loadasindicatedinparagraphs

5-38,

Operation

Characteristics.

Unscrew

the

plastic

in-

sulated

ferrules

on

the

two OUTPUT binding

posts

of

the

Model 722A. Attach one end ofanalligator

clip-

leadtothe

main

body of

the

negative

terminal

binding

postinthe

vicinityofthe

cross

hole. Attach

the

other

end of

this

clip-lead

to

the

negative

terminalofthe

reference

voltage

supply. Attach one of

the

alligator

clips

of

an

r5j)

AC-16S

(shielded

dual

banana

plug

to

alligator

clips)tothe

main

body of

the

positive

terminal

binding

postinthe

vicinityofthe

cross

hole.

Attach

the

other

alligator

clipofthe

AC-16Stothe

positive

terminal

binding

postofthe

reference

voltage

supply.

c.

Attach

the

dual

banana

plug of

the

AC-16Stothe

Model 405

Voltmeter.

d.

Turn

the

CURRENT LIMIT

controlonthe

front

panel

fully

clockwise.

e.

Adjust

the

output

currentofthe

Model 722A

under

test

to 2

amperes

on

the

meter

on

the

front

panel.

Adjust

the

voltageonthe

reference

Model 722A

such

5-7

Section V

Paragraph

5-41

that

the

reading

on

the

Model 405

Voltmeterisless

than one

volt

(difference

between

the

722's).

f.

WARNlNG~Becareful~

Disconnect

one end of

the

load

but

leave

loadinsuchaposition

that

the

load

may

be

connected

with

the

aid

of an

insulated

tool.

g.

Reconnect

load

with an

insulted

tool while

watch-

ing

change

in

voltage on Model 405

Voltmeter.

The

change

in

voltage

shouldbeless

than 3

millivolts.

If not,

turn

both

supplies

off and tighten

connections.

If

the

changeinvoltageisstill

too

great

check

the

LOCAL-REMOTE

switchtobe

sureitisinthe

LOCAL

position.

Model 722A

5-41.

LINE REGULATION.

a.

With

the

two Model

722's

connectedasin

para-

graph

5-40,

Load

Regulation,

connect

the

722

under

test

to a

variable

power

supply.

b. Change

the

line

voltage

from

115

volts

to 103.5

volts

and note

the

changeinthe

output

voltage.

The

change

shouldbe2

millivoltsorless.

c.

Increase

the

line

voltage

to 126.5

volts

and

note

the

output

voltage

change.

This

change

should

be 2.5

millivoltsorless.

r--------------

SCHEMATIC

DIAGRAM NOTES

---------------.,

1. Heavy

solid

line

shows

main

signal

path; heavy

dashed

line

shows

control,

secondary

signal,

or

feedback

path.

2. Heavy box

indicates

front-panel

engraving;

light

box

indicates

chassis

marking.

3.

Arrows

on

potentiometers

indicate

clockwise

rotationasviewed

from

the

round

shaft

end,

counterclockwise

from

the

rectangular

shaft

end.

4.

Resistance

values

in

ohms,

inductance

in

microhenries,

and

capacitanceinpicofarads

unless

otherwise

specified.

5.

Rotary

switch

schematics

are

electrical

representations;

for

exact

switching

details

refer

to the

switch

assembly

drawings.

6.

Relays

shownincondition

prevailing

during

normal

instrument

operation.

7.

Connections

between

the

etched

circuit

board

and

the

chassis

wiring

are

indicatedbythe

usual

arrowhead-arrowtail

combination.

The

arrowhead

indicates

the

connections

on the

board

which plugs

into

the

socket

on

the

chassis

(indicatedbythe

arrowtail).

The

board

and

connectionisindicatedbythe

letter-number

combination,

e.g.A2indicates

a connection

on

boardAat

pin 2.

5-8

01155-1

Model 722A

Section

V

Figure

5-4

+ +

L-.z....----

....

.......;L-

....

---<A2~.-.----------4---+-1-3-.3-V-R-E-F----4---4--+

CR23

C2

TO

R36

.J,

SERIES

815

REGULATOR

014

R41

R42

R43

CR27

2N650

T

CR22

350

350

450

-13V

OV

REF

C6

A6

R44

C23

R47 -

C24

10K

+

20

790

+

20UF

UF

R45

AI2

52.6K

)~ci3

CR24

AI

100V

REFERENCE

CR25

I'J.

CR26

VOLTAGE

C21

C22

ADJUST

27V

R50

20

+

100

1000

UF

UF

~8

+

COPYRIGHT 1961BYHEWLETT.PACKARD COMPANY

This

drawingisIntended

for the

operation

and

maintenanceofHewlett-Packard equip-

ment

andIsnot tobeused

atherwise

or

reproduced

without written

consentofthe

Hewlett-Packard

Company.

722

A -

tt["

PI

- T

100'

Figure

5-4.

Reference

Power

Supply

01155-1

5-9

Section

V

Figure

5-5

Model 722A

,t

+

,...----------

/

/

/

/

/

/

T2

/

...

1

I

rl

I

CRI2

I

/

I

/

r-(CI5/

......

1

'CIO,

CRI3

-::~

f6~

60V

+

UF

CRI4

~CI4,

,

....

~:::

L"C12

60V

~

20

UF

CRI5

..

)

CII~

..

CRI6

..

r,

TI

I
I

I
I

I

I

I

I

I
I

I

Il...-.--------t~~

I

I

i - - - - -r- - - - - - - - --- - - - - -- - -

I

I

I

I

r

115V S4

','-

_

U

230V

rACl

~

§]

FI

115V-230V

SWITCH

OPTION

PI

PI

rAn

Lf~

~

SIA

OR

SLOW BLOW

2.5

AMP

COPYRIGHT

1961BYHEWLETT·PACKARD

COMPANY

Thl.

drawln"I.Intended

for the

operation

and

maintenanceofHewlett·Packard

equip-

ment

and

I. not tobeu.ed

otherwi.e

or

reproduced

without written

con.entofthe

Hewlett.Packard

Company.

722.-PS

-(I

0"

ZI-TlOS

Ie

Figure

5-5.

Power

Supply

(sheet1of

2)

5-10

01155-1

Model 722A

Section

V

Figure

5-5

L.....-_-----J

0

R30

100

r

-.,

I - I

I)

I

1 I

1.---+-1--0

1

REM

I

6 I I

L.-..----o-+K

1)----1&

:

r.--~

I - 1 + I

~~~~

1

S3 I

!'--+I

-00

REM

I

~~LJ,

1+1

r----<>-T<~

I)

I

I

LI-_J

- C6

+:::::~

500

UF

A8

'1'

M2

V

,fRIO

...

~

IOUTPUT I

15

VOLTAGE

60V

A~I

,

A15

~13

'1'

R40

IR2.

10

59.95K

~3

CURRENT-

POWER

LIMITER

Q4

2N650

I <B13

B5~

I

~C9~(--"'.+-I----4)C5~

CRI7

R36 R38
560

12K

SERIES

REGULATORS

o

QI

2N443

----<C4~(-----

....

*I..::.C:..:.:R5==-------~)

C8>----

SERIES

REGULATORl"Q!JE

DRIVER

Q3

2NI159

B

R7

800

R3
200

CI

:::::~

3500
UF

R31
800

I

.----o----.T

L

~I

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( 0

~

R2

2

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I

-----------------------------------------AM~rn---------~

C~:r-RA...;.T....;;E~------i0_

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B6@MI\

DS2

'!.Y

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1

RI5 RI6

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I I

2~F73

I.5K

500

fs=2.5A

\

:~~

~

~

S2 OUTPUT

!J

Ao!~

.........-.........

....(~84

~

'B4~)-I""""-

..--......

....j~--~~------.-.ol

....-...--..

---.....c)-~I~

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B

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5600

2700

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R8

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,~

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1000

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CW

00

CW

R20 .I

UF

100

CW~r

R9

100

;!<CW

2000

CW

R29

47K

RII

.IA

2.2A

~.

I FINE d 100

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600

LIMIT

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LIMIT

ADJ.

v

C5

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--+----------1t----+-----7'-,I.-..,

f'

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+ \

VOLTAGE

.,"'B/il

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...----U''''.---+--4',

B5''--

\ R25

I

~~~

II

1\

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CW

5000

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./

L

1-

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CURRENT

LIMIT

A7

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f

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REF

R51

1000

,

AI4

......

f

+13.3V

REF

A2

T

t

+13.3V

REF

R33

.015

CRI8

I-lI-B_

.....

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....

---ftC:\-+II~I-+------.

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AMPLIFIER

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220

3600

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AI3

~~

,....--

.......--...EAMPLIFIER

CJ.-tIBt+----4~-

.....

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+-+13.3V

REF.

y,

QI2

:::::~~~

I LI

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2N247

R39

1

UF

C

~.~

2700

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~~

LIMITERS

~

~

L..------------<~BI4++---

......-

.......

--.....J

CR20

CR21

AMPLIFIER

C

QII

2NI159

,

...

BI5

i

COPYRIGHT

19'7IYHEWlm.PACKAID

COMPANY

I

613

I

C3

L...--

R

-

32

-+r---

..

C

-I-c-,3----1

CI4

10

KI

i

+T

100UF+J100UF

--J--------<II:~~CI~CI2~

-

01155-1

Figure

5-5.

Power

Supply

(sheet2of

2)

5-11/5-12

Model 722A Sectio:l

VI

Paragraphs

6-1to6-8

SECTION

VI

REPLACEABLE

PARTS

6-1.

INTRODUCTION.

6-5.

ORDERING

INFORMATION.

6-2.

This

section

contains

information

for

ordering

replacement

parts

for

the

Model 722A

DC

Power

Supply.
6-3.

Table

6-1

lists

partsinalpha-numerical

order

of

their

reference

designators

and

indicates

the

description

and~stock

numberofeach

part,

together

with any

applicable

notes.

Table

6-2

lists

parts

in

alpha-numerical

orderoftheir~stock

numbers

and

provides

the

following

information

on

each

part:

a.

Descriptionofthe

part

(see

listofabbreviations

below).

b.

Manufacturerofthe

part

in a

five-digit

code;

see

listofmanufacturersinappendix.

c.

Typical

manufacturer's

stock

number.

d.

Total

quantity

usedinthe

instrument

(TQ

column).

e.

Recommended

spare

part

quantity

for

complete

maintenance

during

one

year

of

isolated

service

(RS

column).

6-4.

Miscellaneous

parts

not

indexedintable

6-1

are

listedatthe

end of

table

6-2.

6-6.

To

orderareplacement

part,

address

order

or

inquiry

either

to

your

authorized

Hewlett-Packard

sales

representative

or

to

CUSTOMER SERVICE
Hewlett-Packard

Company

395

Page

Mill

Road

Palo

Alto,

California,

or,inWestern

Europe,

to

Hewlett-Packard

S.A.

Rue du Vieux

Billard

o. 1

Geneva,

Switzerland.

6-7.

Specify

the

following

information

for

each

part:

a.

Model and

complete

serial

numberofinstrument.

b.

Hewlett-Packard

stock

number.

c.

Circuit

reference

designator.

d.

Description.

6-8.

To

orderapart

not

listedintables

6-1,

6-2,

give

a

complete

description

of

the

part

and

include

its

function and

location.

A

B

C

CR

DL

DS

=

assembly

=

motor

=

capacitor

= diode

=

delay

line

=

device

signaling

(lamp)

F

FL

J

K

L

M

=

fuse

=

filter

=

jack

=

relay

=

inductor

=

meter

REFERENCE

DESIGNATORS

P =plug

Q =

transistor

R =

resistor

RT =

thermistor

S =

switch

T =

transformer

v =

vacuum

tube, neon

bulb, photocell,

etc.

W =

cable

X =

socket

XF=fuseholder

XV

= tube

socket

XDS=lampholder

ABBREVIATIONS

elect=electrolytic

mtg

= mounting

encap=

encapsulated

my =

mylar

obd =

orderbyde­scription

p

=

peak

pc

=

printed

circuit

board

pf

=

picofarads

=

10-12farads

pp

=

peak-

to-

peak

piv

=

peak

inverse

voltage

pos

=

position(s)
poly=polystyrene
pot=potentiometer

rect=rectuier

td

=

time

delay

Ti02=

titanium

dioxide

rot=rotary
rms=root-

mean-

square

rmo=rack

mount only

=

toggle

=

tolerance

=

trimmer

=

traveling

wave

tube

=

variable

= with

=

watts

= wirewound

=without

=

optimum

value
selectedatfactory,
average

value

shown

(part

may

be

omitted)

s-

b = slow - blow

Se =

selenium

sect=section(s)
Si =

silicon

sl

=

slide

var

wi

W

ww

wlo

•

tog
tol
trim

twt

=

normally

closed
= neon
=

normally

open
=

negative

positive

zero-zero

tem-

perature

coefficient

= not

separately

replaceable

nsr

NC
Ne
NO

NPO

Ge=germanium
grd=ground

(ed)

h =

henries

Hg =

mercury

impg =

impregnated
incd=incandescent
ins=insulation

(ed)

K =

kilohms

f =

farads

fxd = fixed

lin=linear

taper

log=logarithmic

taper

m =

milli

= 10-

3

M =

megohms
ma=milliamperes
minat=

miniature
mfg =

metal

film

on

glass

mfr

=

manufacturer

bp =

mndpass

bwo=mckward

wave

oscillator

EIA =

Tubes

and

transistors

selected

for

best

performance

will

be

supplieduordered

by

~

stock

numbers;
tubesortransistors
meeting

Electronic

Industries'

Associa-

tion

standards

will

normally

result

in

instrument

operating

within

specllications

c =

carbon
cer=ceramic
cmo=cabinet

mount only

coef =

coefficient
com=common
comp=composition
conn =

connection
crt=cathode-ray

tube

dep =

deposited

det=detector

J

01155-1

6-1

Section

VI

Table

6-1

Table

6-1.

Reference

Designation

Index

Model 722A

Circuit

Reference

C1
C2
C3
C4
C5
C6
C7

thru

C10
C11
C12
C13,

14
C15
C16

thru

C20
C21
C22
C23, 24
CR1

thru

CR4
CR5
CR6
CR7
CR8
CR9
CR10, 11
CR

12

thru

CR16
CR17
CR18
CR19

CR20, 21
CR22, 23
CR24, 25
CR26
CR27
CR28
CR29

DS1, 2

F1

J1

K1

6-2

~

Stock No.

0180-0096
0170-0040

0180-0064

0170-0055
0180-0093
0180-0047

0180-0095

0180-0094
0170-0017

0180-0045
1901-0019
1901-0007

G-29G-53

G-29A-74
G-31G-33L

1901-0008

G-3lA-7L

1901-0020

G-31H-22H
G-29G-54
G-31G-10L
G-29A-10
G-29A-26
1450-0025
2110-0015
2110-0021
0360-0079
0490-0032

De

scription

fxd,

elect,

3500

uf,

100 vdcw

fxd,

my,

0.047uf±10%, 200 vdcw

fxd,

elect,

35 uf +100% -10%, 6 vdcw

fxd,

my,

0.1

uf ±20%, 100 vdcw

fxd,

elect,

20 uf, 150 vdcw

fxd,

elect,

500

uf,

75 vdcw

Not

Assigned

fxd,

elect,

100

uf,

100 vdcw

SameasC5

fxd,

elect,

100

uf,

25 vdcw

fxd,

my,

0.01uf±5%, 400 vdcw

Not

Assigned
SameasC5
SameasC11

fxd,

elect,

20 uf, 25 vdcw

Diode,

si:

1N1344

Diode,

si:

500 rna, 400

PIV

Diode,

si
SameasCR1
Diode,

si
Diode,

si
Diode,

si:

500 rna 100

PIV

SameasCR5
SameasCR10
Diode,

si
SameasCR8
Diode,

si:

1N2069
SameasCR5
Diode,

si

Diode,

si

Diode,

si

Diode,

si

Diode,

si

Lamp,

neon:

indicator,

clear

lens

Fuse,

cartridge:

2. 5

amp,

slow

blow

(for

115 V

operation)

Fuse,

cartridge:

1.25

amp,

slow blow

(for

230 V

operation)

Board,

terminal:5terminal

Relay,

inductor:

2500

ohms

±10%

# See

introductiontothis

section

Note

01155-1

Model

722A

Table

6-1.

Reference

Designation

Index

(Cont'd)

Section

VI

Table

6-1

Circuit

~

Stock

No.

Description

Note

Reference

L1

9140-0037

Inductor,

fixed:

5.0

mh

M1

1120-0104

Meter:

0-2.5

amps

M2

1120-0103

Meter:

0-60

volts

PI

8120-0050

Cord,

power

Q1

1850-0058

Transistor:

2N443

Q2

1850-0059

Transistor:

2N173

Q3

1850-0057

Transistor:

2Nl159

Q4

1850-0048

Transistor:

2N650

Q5

thru

Q10

Not

Assigned

Q11

SameasQ3

Q12

1850-0037

Transistor:

2N274

Q13

1851-0001

Transistor:

2N169

Q14, 15

SameasQ4

R1

0687-1041

fxd,

comp,

lOOK

ohms

:!:10%,

1/2

W

R2

0813-0021

fxd,

ww,

2

ohms

:!:10%,

5 W

R3

0813-0022

fxd,

ww,

200

ohms

:!:10%,

5 W

R4

0813-0027

fxd,

ww,

1K

ohms

:!:10%,

5 W

R5A,

B

2100-0263

var,

ww,

dual

ganged;

front

sect-5K

ohms

+10%,

2 W;

rear

sect,

lin,

300

ohms

:!:10%,

2 W -

R6

0693-5621

fxd,

comp,

5600

ohms

:!:10%,

2 W

R7

0813-0026

fxd,

ww, 800

ohms

:!:10%,

5 W

R8

SameasR4

R9

0687-4731

fxd,

comp,

47K

ohms

:!:10%,

1/2

W

RIO,

11

0813-0025

fxd,

ww, 600

ohms

:!:10%,

5 W

R12

0690-8221

fxd,

comp,

8200

ohms

:!:10%, 1 W

R13

0687-4701

fxd,

comp,

47

ohms

:!:10%,

1/2

W

R14

2100-0118

var,

comp,

100

ohms

:!:20%,

0.2

W

R15

0727-0110

fxd,

depc,1500

ohms

:!:1%,

1/2

W

R16

2100-0078

var,

ww,

lin,

500

ohms

:!:30%,

3/10

W

R17

0687-2721

fxd,

comp,

2700

ohms

:!:10%,

1/2

W

R18

0812-0013

fxd,

ww,O.7

ohm

:!:3%,

5 W

R19

0687-5621

fxd,

comp,

5600

ohms

:!:10%,

1/2

W

R20

2100-0261

var,

comp,

2000

ohms

:!:20%,O.3 W

R21,

22

Not

Assigned

R23

0690-2721

fxd,

comp,

2700

ohms

:!:10%, 1 W

R24

2100-0003

var,

ww, 100

ohms

:!:10%,

2 W

R25

2100-0262

var,

ww,

5K

ohms

:!:5%,

4. 5 W

R26

0727-0327

fxd,

depc,59,950

ohms

:!:1%,

1/2

W

=#

See

introductiontothis

section

01155-1

6-3

Section

VI

Table

6-1

Table

6-1.

Reference

Designation

Index (Cont'd)

Model 722A

Circuit

Reference

R27
R28
R29,

30
R31
R32
R33

R34
R35
R36
R37
R38
R39
R40
R41,

42
R43
R44
R45
R46
R47
R48

R49
R50,

51

Sl

S2
S3
S4

Tl
T2

6-4

~

Stock No.

0699-0002
0687-1011

0690-1001

0687-2211
0686-3625
0687-5611
0687-2711
0687-1231

0687-1001
0813-0023
0813-0024
0687-1031
0727-0196
0687-3921
0727-0091
2100-0038

0757-0021
3101-0031
3101-0033
3101-0017
3101-0011

9100-0132
9100-0133

De

scription
SameasR9
fxd,

comp,

6.8

ohms

±10%,

1/2

W

fxd,

comp,

100

ohms

±10%,

1/2

W

SameasR7
fxd,

comp,10ohms

±1O%,

1 W

Consistsofapproximately11inchesofstranded

#22

wire;

adjustedatfactory

fxd,

comp,

220

ohms

±10%,

1/2

W

fxd,

comp,

3600

ohms

±5%,

1/2

W

fxd,

comp,

560

ohms

±10%,

1/2

W

fxd,

comp,

270

ohms

±10%,

1/2

W

fxd,

comp,

12000

ohms

±10%,

1/2

W

SameasR17
fxd,

comp,10ohms

±1O%,

1/2

W

fxd, ww, 350

ohms

±10%, 5 W

fxd, ww, 450

ohms

±10%, 5 W

fxd,

comp,

10K

ohms

±10%,

1/2

W

fxd,

depc,52, 600

ohms±1%,

1/2

W

fxd,

comp,

3900

ohms

±10%,

1/2

W

fxd,

depc,790

ohms

±1/2%,

1/2

W

var,

ww, 300

ohms

Not

Assigned

fxd,

mfg,

1K

ohms±1%,

1/2

W

Switch, toggle:

3PDT

Switch,

slide:

DPDT

Switch,

toggle:

DPDT

SWitch,

slide:

DPDT

SameasSl

(3101-0033)

Transformer,

power

Transformer,

variable:

115 V

input
0-115Voutput
0-135Voutput

# See

introductiontothis

section

Note

01155-1

Model 722A

Table

6-1.

Reference

Designation

Index (Cont'd)

Section

VI

Table

6-1

Circuit

Reference

01155-1

~

stock

No.

AC-10C
AC-54C

G-10G
G-32R
G-74BB
G-74D

G-110D
712A-12C
722A-65A
722A-65B
722A-65C
722A-85A

1200-0043
1200-0044
1251-0140
1251-0141
3150-0017
3160-0026

De

scription

MISCELLANEOUS

Binding

post,

black:

output

terminal

Insulator,

binding

post,

3 hole

black,

output

Binding

post,

red:

output

terminal

Coupler-bellows:

1/4"to3/8"

shaft

Knob,

black:

23/4",

COARSE VOLTAGE

Knob,

black:

3/4"

w/pointer,

CURRENT LIMIT, FINE

VOLTAGE

Guide,

printed

circuit

Clamp-stop

(coarse

voltage)

Assembly,

circuit

board

"A"

Assembly,

circuit

board

"B"

Assembly,

circuit

board

"C"

Holder,

air

filter

Insulator,

transistor

mounting

Socket,

transistor

mounting

Connector,

printed

circuit:

15

pin

Connector,

printed

circuit:

18

pin

Filter,

air

Fan:

100 CFU, 115 VAC

:!:10%,

50/60

cycles,

14 W

=#

See

introductiontothis

section

Note

6-5

Section VI

Table

6-2

Table

6-2.

Replaceable

Parts

(Cont'd)

Model 722A

rffJ

StockNo.

Description

Mfr.

Mfr.

Part

No. TQ

RS

G-29A-10

Diode,

si

28480

G-29A-IO

1 1

G-29A-26

Diode,

si

28480

G-29A-26

1 1

G-29A-74

Diode,

si

28480

G-29A-74

2 2

G-29G-53

Diode,

si

28480

G-29G-53

1 1

G-29G-54

Diode,

si

28480

G-29G-54

1 1

G-31A-7L

Diode,

si

28480

G-3lA-7L

1 1

G-31G-1OI

Diode,

si

28480

G-31G-10L

1 1

G-31G-331

Diode,

si

28480

G-31G-33L

1

1

G-31H-221

Diode,

si

28480

G-31H-22H

2 2

0170-0017

fxd,

my,

0001uf±.5%,

400 vdcw

84411 620S

1

1

0170-0040

fxci, my,

0.047uf±.10%,

200 vdcw

56289

148P47392

1

1

0170-0055

fxd,

my,O.1uf±.20%,

100 vdcw

56289

148P10491

1 1

0180-0045

fxd,

elect,

20

uf,

25 vdcw

56289

type 30D

2 1

0180-0047

fxd,

elect,

500

uf,

75 vdcw

56289

D32443

1 1

0180-0064

fxd,

elect,

35uf-10% +100%,

6vdcw

56289

30D132A1

1 1

0180-0093

fxd,

elect,

20

uf,

150 vdcw

56289

D32610

3 1

0180-0094

fxd,

elect,

100

uf,

25 vdcw

56289

30D188A1

2

1

0180-0095

fxd,

elect,

100

uf,

100 vdcw

56289

D32611

2 1

0180-0096

fxd,

elect,

3500

uf,

100 vdcw

56289

type 32D

1

1

0360-0079

Board,

terminal:5terminal

71286

Orderbydescription

1 0

0490-0032

Relay,

inductor:

2500

ohms

±.10%

71482

R#A-110526

1

1

0686-3625 fxd,

comp,

3600

ohms

±.5%,

1/2

W

01121

EB

3625

1 1

0687-1001

fxci,

comp,10ohms

±.10%,

1/2

W

01121

EB

1001

1 1

0687-1011

fxd,

comp,

100

ohms

±.10%,

1/2

W

01121

EB

1011

2

1

0687-1031

fxd,

comp,

10, 000

ohms

±.10%,

1/2

W

01121

EB

1031

1 1

0687-1041

fxd,

comp,

lOOK

ohms

::t10%,

1/2

W

01121

EB

1041

1 1

0687-1231

fxd,

comp,

12K

ohms

±.10%,

1/2

W

01121

EB

1231

1

1

0687-2211

fxd,

comp,

220

ohms

±.10%,

1/2

W

01121

EB

2211

1

1

0687-2711

fxd,

comp,

270

ohms

±.10%,

1/2

W

01121

EB

2711

1 1

0687-2721

fxd,

comp,

2700

ohms

±.10%,

1/2

W

01121

EB

2721

2

1

0687-3921

fxd,

comp,

3900

ohms

±.10%,

1/2

W

01121

EB

3921

1 1

0687-4701

fxci,

comp,47ohms

±.10%,

1/2

W

01121

EB

4701

1 1

0687-4731

fxci,

comp,

47K

ohms

±.10%,

1/2

W

01121

EB

4731

2

1

0687-5611

fxd,

comp,

560

ohms

±.10%,

1/2

W

01121

EB

5611

1 1

0687-5621

fxd,

comp,

5600

ohms

::t10%,

1/2

W

01121

EB

5621

1 1

0690-1001

fxd,

comp,10ohms

±.10%,

1 W

01121

GB 1001

1 1

0690-2721

fxci,

comp,

2700

ohms

±.10%,

1 W

01121

GB 2721

1 1

# See

introductiontothis

section

6-6

01155-1

Model 722A

Table

6-2.

Replaceable

Parts

(Cont'd)

Section VI

Table 6-2

~

StockNo.

Description

Mfr.

Mfr.

Part

No.

TQ

RS

0690-8221

fxd,

comp,

8200

ohms

±.10%,

1 W

01121 GB 8221

1

1

0693-5621

fxd,

comp,

5600

ohms

±.10%,

2 W

01121 HB 5621

1 1

0699-0002

fxd,

comp,

6. 8

ohms

±.10%,

1/2

W

01121

EB

68G1

1

1

0727-0091

fxd,

depc,790

ohms

±.1/2%,

1/2

W

19701

DC-1/2C

special,

1 1

orderbydescription

0727-0110

fxd,

dep

c~

1500

ohms

±.1%,

1/2

W

19701

DC1/2CR5,

order

1 1

by

description

0727-0196

fxd,

dep

c,

52,600

ohms

:t1%,

1/2

W

19701

DC-1/2CR5,

order

1

1

by

description

0727-0327

fxd,

dep

c,

59,950

ohms

±.1

%,

1/2

W

19701

DC-1/2R5,

order

1 1

by

description

0757-0021

fxd,

mfg,

1K

ohms

±.1%,1/2

W

19701

MF1/2T-2,

order

2

1

by

description

0812-0013

fxd,

WW,

O.

7

ohm

~%,

5W

91637

RS5

1

1

0813-0021

fxd,

ww,

2

ohms

±.10%,

5W

35434

CN5,

order

by

1 1

description

0813-0022 fxd,

ww,

200

ohmsr±.10%,

5 W

35434

CN5,

order

by

1 1

description

0813-0023

fxd,

ww,

350

ohms

±.10%,

5W

35434

CN5,

order

by

2 1

description

0813-0024

fxd,

ww,

450

ohms

±.10%,

5W

35434

CN5,

order

by

1 1

description

0813-0025

fxd,

ww,

600

ohms

±.10%,

5W

35434

CN5,

order

by

2

1

description

0813-0026

fxd,

ww,

800

ohms

±.10%,

5W

35434

CN5,

order

by

2 1

description

0813-0027

fxd,

ww,

1K

ohms

±.10%,

5W

35434

CN5,

order

by

2

1

description

1120-0103

Meter:

0-60

volts

06555 type

2PL

order

by

1 1

description

1120-0104

Meter:

0-2.5

amps

06555

type

2PL,

order

by

1 1

description

1450-0025

Lamp,

neon:

indicator,clear

lens

03797

E-lite

lAGl-1369

2

2

1850-0037

Transistor:

2N274

02735

2N274

1

1

1850-0048

Transistor:

2N650

04713

2N650

3

3

1850-0057

Transistor:

2Nl159

16758

2Nl159

2 2

1850-0058

Transistor:

2N443

16758

2N443

1 1

1850-0059

Transistor:

2N173

16758

2N173

1

1

1851-0001

Transistor:

2N169

03508

2N169

1

1

1901-0007

Diode,

silicon:

500 rna,

400 PlY

81483

Orderbydescription

8

8

1901-0008

Diode~

silicon:

500 mn,

100 PlY

81483

SD9lA

3

3

1901-0019

Diode,

silicon:

1N1344

05277

1N1344

5

5

=It

See

introductiontothis

section

01155-1

6-7

Section

VI

Table

6-2

Table

6-2.

Replaceable

Parts

(Cont'd)

Model 722A

rfjJ

stock

No.

1901-0020
2100-0003

2100-0038

2100-0078

2100-0118

2100-0261

2100-0262
2100-0263

2110-0015

2110-0021

3101-0011
3101-0017
3101-0031
3101-0033
8120-0050

9100-0132
9100-0133

9140-0037

Description

Diode,

silicon:

IN2069

var,

ww, 100

ohms

.±.10%,

2 W

var,

ww, 300

ohms

var,

ww,

lin,

500

ohms

.±.30%,

3/10

W

var,

comp,

100

ohms

.±.20%,

0.2

W

var,

comp,

2000

ohms

.±.20%,

0.3

W

var,

ww,

5K

ohms

±.5%,

4. 5 W

var,

ww,

dual

ganged;

front

sect-5Kohms

+10%, 2 W;

rear

sect,

lin,

300

ohms

+10%,

2W

-

Fuse,

cartridge:

2.5

amp,

slow

blow

(for

115 V

operation)

Fuse,

cartridge:

1.25

amp,

slow blow

(for

230 V

operation)

Switch,

slide:

DPDT

Switch,

toggle:

DPDT

SWitch,

toggle:

3PDT

Switch,

slide:

DPDT

Cord,

power

Transformer,

power

Transformer,

variable:

115 V

input

0-115

V output

0-135

V output

Inductor,

fixed:

5.0

mh

Mfr.

01295

11237
11237

11237

11237

11237

24655

11237

71400

71400

42190
04009
88140
42190
70903

98734
24655

99848

Mfr.

Part

No.

IN2069

type 252,

order

by

description

type 252,

order

by

description

model

70,

order

by

description

type 70,

order

by

description

type 70,

order

by

description
973-M
2-252

MDL2-1/2

MDLI-25

4603
AH&H

82611
CH-7615K2
4633
CS-9941/PH-

151/7.5ft.

9433

W5

35000-15-

502

TQ

RS

2 2

1 1

1 1

1 1

1 1

1 1

1 1

1 1

1 10

1 1
1 1
1 1

2 1

1 1

1 1
1 1

1 1

6-8

=IF

See

introductiontothis

section

01155-1

h

odel722A

0ffi

StockNo.

Table

6-2.

Replaceable

Parts

Description

MISCELLANEOUS

Mfr.

Mfr.

Part

No.

Section

VI

Table

6-2

TQ

RS

AC-10C
AC-54C
G-10G
G-32R
G-74BB
G-74D

G-110D
712A-12C
722A-65A
722A-65B
722A-65C
722A-85A
1200-0043
1200-0044
1251-0140
1251-0141
3150-0017
3160-0026

Binding

post,

black:

output

terminal

Insulator,

binding

post,

3 hole

black,

output

Binding

post,

red:

output

terminal

Coupler-bellows:

1/4"to3/8"

shaft

Knob,

black:23/4",

COARSE VOLTAGE

Knob,

black:

3/4"

w/pointer,

CURRENT

LIMIT, TINE VOLTAGE

Guide,

printed

circuit

Clamp-stop

(coarse

voltage)

Assembly,

circuit

board

"A"

Assembly,

circuit

board

"B"

Assembly,

circuit

board

"C"

Holder,

air

filter

Insulator,

transistor

mounting

Socket,

transistor

mounting

Connector,

printed

circuit:

15

pin

Connector,

printed

circuit:

18

pin

Filter,

air

Fan:

100 CFU, 115 VAC +10%,

50/60

cycles

14W

-

28480
28480
28480
28480
28480
28480

28480
28480
28480
28480
28480
28480
76530
83298
95354
95354
82866
82877

AC-lOC
AC-54C
G-10G
G-32R
G-74BB
G-74D

G-110D

712A-12C
722A-65A
722A-65B
722A-65C

722A-85A
294457
210-6400
SD-615L
SD-618L
Orderbydescription
Orderbydescription

1 1

2 0

2 1

2 0

1 0

2 0

6 0

1 0
1 0
1 0
1 0
1 0

2 0

2 1

1 1

2 1

1 1

1 1

01155-1

:#

See

introductiontothis

section

6-9

Appendix

Model

722A

APPENDIX

CODE

LIST

OF MANUFACTURERS (Sheet 1

of

2)

The following

code

numbers

are

from

the

Federal

Supply

Code

for

Manufacturers

Cataloging

Handbooks

H4-1

(NametoCode)

and

H4-2

(CodetoName)

and

their

latest

supplements.

The

dateofrevision

and

the

dateofthe

supplements

used

appear

at

the

bottomofeach

page.

Alphabetical

codes

have

been

arbitrarily assignedtosuppliers

not

appearingintheH4handbooks.

CODE

NO.

MANUFACTURER

ADDRESS

CODE

NO.

MANUFACTURER

ADDRESS

CODE

NO.

MANUFACTURER

ADDRESS

8radford,

Pa.

Fullerton,

Calif.

Quincy,

Mass.

Cleveland,

Ohio

Paramus,

N.J.

and

Philadelphia,

Pa.

Waltham,

Mass.

Selma,

N.C.

Chicago,

III.

Elmsford, N.Y.

So.

Norwalk,

Conn.

Inc.

Tonawanda,

N.Y.

North

Adams,

Mass.

St. Paul, Minn.

Bradley

Semiconductor

Corp.

New

Haven,

Conn.

Hartford,

Conn.

JohnE.Fast&Co.
Dialight

Corp.

General

Ceramics

Corp.
Girard-Hopkins
Drake

Mfg.

Co.

Hugh

H. Eby Inc.

Gudeman

Co.

Erie Resistor

Corp.

Hansen

Mfg.

Co.,

Inc.

Helipot

Div.ofBeckman

Instruments,

Inc.

H

ughe~

Products

Div.ofHughes

Aircraft

Co.

Newport

Beach,

Calif.

Amperex

Electronic

Co.,

Div.

of

North

American

Phillips

Co.,

Inc.

Hicksville, N.Y.

49956
54294
55026
55933
55938
56137
56289
59446
61

775

48620

Precision

Thermometer

Inst.

Co.

Raytheon

Mfg.

Co.

Shallcross

Mfg.

Co.

Simpson

Electric

Co.

Sonotone

Corp.

Sorenson&Co.,

Inc.

Spaulding

Fibre

Co.,

Sprague

Electric

Co.

Telex, Inc.

Union Switch

and

Signal,

Div.ofWestinghouse

Air Brake

Co.

Pittsburgh,

Pa.

62

1 1 9 Universal

Electric

Co.

Owosso,

Mich.

64959

Western

Electric

Co.,

Inc.

New

York, N.Y.

65092

Weston

Inst. Div.ofDaystrom,

Inc.

Newark,

N.J.

66346

Wollensak

Optical

Co.

Rochester,

N.Y.

70276

Allen

Mfg.

Co.

Hartford,

Conn.

70309

Allied

Control

Co.,

Inc.

New

York, N.Y.

70485

Atlantic

India

Rubber

Works, Inc.

Chicago,

III.

New York, N.Y.

Chicago,

III.

Cleveland,

Ohio

New

York, N.Y.

70563

70903
70998
71

002

71

041

71

450

71

468

71

471

71

482

71

590

Amperite

Co.,

Inc.

Belden

Mfg.

Co.

Bird

Electronic

Corp.

Birnbach

Radio

Co.

Boston

Gear

Works

Div.

of

Murray

Co.ofTexas

71218 Bud

Radio

Inc.

7 1

286

Camloc

Fastener

Corp.

71

3 1 3

AllenD.Cardwell

Electronic

Prod.

Corp.

Plainville,

Conn.

7 1

400

Bussmann Fuse Div.ofMcGraw-

Edison

Co.

St. Louis, Mo.

CTS

Corp.

Elkhart,

Ind.

Cannon

Electric

Co.

Los

Angeles,

Calif.

Cinema

Engineering

Co.

Burbank,

Calif.

C.P.Clare&Co.

Chicago,

III.

Centra

lab

Div.ofGlobe

Union Inc.

Milwaukee, Wis.

71700

The

Cornish

Wire

Co.

New

York, N.Y.

7 1

744

Chicago

Miniature

Lamp

Works

Chicago,

III.

7 1

75

3 A.O.Smith

Corp.,

Crowley

Div.

West

Orange,

N.J.

71

785

Cinch

Mfg.

Corp.

Chicago,

III.

7 1

984

Dow

Corning

Corp.

Midland,

Mich.

72136Electro

Motive

Mfg.

Co.,

Inc.
Willimantic,

Conn.

Chicago,

III.

Brooklyn, N.Y.

Keasbey,

N.J.

Oakland,

Calif.

Chicago,

III.

Philadelphia,

Pa.

Chicago,

III.

Erie, Pa.

Princeton,

Ind.

73

293

73

506

73445

723

54

7261

9
72656
72758
72765
72825
72928
72982

73061
731

38

73743

Fischer

Special

Mfg.

Co.

1 3 7 9 3 The

Genera

I I

ndustries

Co.

73559

Carling

Electric, Inc.

73682

GeorgeK.Garrett

Co.,

Inc.

Philadelphia,

Pa.

Cincinnati,

Ohio

Elyria,

Ohio

Phoenix, Ariz.

Teterboro,

N.J.

Pasadena,

Calif.

Digitran

Co.

Transistor

Electronics

Corp.

Minneapolis,

Minn.

Westinghouse

Electric

Corp.

Electronic

Tube

Div. Elmira, N.Y.

Avnet

Corp.

Los

Angeles,

Calif.

Fairchild

Semiconductor

Corp.

Mountain

View,

Calif.

Continental

Device

Corp.

Hawthorne,

Calif.

Rheem

Semiconductor

Corp.

Mountain

View,

Calif.

Boonton,

N.J.

Los

Angeles,

Calif.

Boonton

Radio

Corp.

U.S.

Engineering

Co.

Burgess

Battery

Co.

Niagara

Falls,

Ontario,

Canada

Sloan

Company

Burbank,

Calif.

Cannon

Electric

Co.

Phoenix Div.

CBS

Electronics

Semiconductor

Operations,

Div.ofC.B.S. Inc.

Lowell, Mass.

Costa

Mesa,

Calif.

Houston,

Texas

Chicago,

III.

Babcock

Relays, Inc.

Texas

Capacitor

Co.

Electro

Assemblies,

Inc.

Mallory

8attery

Co.

of

Canada,

ltd.

Toronto,

Ontario,

Canada

Ti-Tal, Inc. Berkeley,

Calif.

Carborundum

Co.

Niagara

Falls, N.Y.

CTS of Berne, Inc. Berne,

Ind.

Chicago

TelephoneofCalifornia,

Inc.

So.

Pasadena,

Calif.

Microwave

Electronics

Corp.

Palo

Alto,

Calif.

Palo

Alto,

Calif.

Dover,

N.H.

General

Electric

Co.

G.E.,

Lamp

Division

Nela

Park,

Cleveland,

Ohio

General

Radio

Co.

West

Concord,

Mass.

Grobet

File

Co.ofAmerica,

Inc.

Carlstadt,

N.J.

Hamilton

Watch

Co.

Lancaster,

Pa.

Hewlett-Packard

Co.

Palo

Alto,

Calif.

G.E. Receiving

Tube

Dept.

Owensboro,

Ky.

Lectrohm

Inc.

Chicago,

III.

P.R.Mallory &

Co.,

Inc.

Indianapolis,

Ind.

Mechanical

Industries

Prod.

Co.

Akron,

Ohio

Miniature

Precision Bearings, Inc.

Keene,

N.H.

Chicago,

III.

Englewood,

Colo.

Skokie, III.

Cambridge,

Mass.

071

38

071

26

071

37

07261
07263

07910
07933

07980
081

45

08358

0871

7

0871

8

08792

09026

091

34

09250

09569

1 1312

1

041

1

1

0646
11236
11237

42190

Muter

Co.

4 3

990C.A.

Norgren

Co.

44655

Ohmite

Mfg.

Co.

47904

Polaroid

Corp.

24446
24455

1 1

870

Melabs,

Inc.

1

2697

Clarostat

Mfg.

Co.

1 4 6 5 5

Cornell

Dubilier

Elec.

Corp.

So.

Plainfield,

N.J.

1

5909

The Daven

Co.

Livingston,

N.J.

1

6758

Delco

Radio

Div.ofG.M.Corp.

Kokomo, Ind.

1

8873E.I.

DuPont

and

Co.,

Inc.

Wilmington,

Del.

1

931

5 Eclipse

Pioneer,

Div.

of

Bendix

Aviation

Corp.

t

9500

Thomas A. Edison

Industries,

Div.ofMcGraw-Edison

Co.

West

Orange,

N.J.

1

9701

Electra

Manufacturing

Co.

Kansas

City,

Mo.

20183Electronic

Tube

Corp.

Philadelphia,

Pa.

2 1

520

Fansteel

Metallurgical

Corp.

No.

Chicago,

III.

21

335

The Fafnir

Bearing

Co.

New Britain,

Conn.

21

964

Fed.

Telephone

and

Radio

Corp.

Clifton,

N.J.

Schenectady,

N.Y.

24655
26462

26992
28480
33173
35434
37942
39

543

40920

Burbank,

Calif.

Colton,

Calif.

New

York, N.Y.

Palo

Alto,

Calif.

Humidial

Co.

Westrex

Corp.

Garlock

Packing

Co.,

Electronic

Products

Div.

Camden,

N.J.

Aerovox

Corp.

New

8edford,

Mass.

Amp,

Inc.

Harrisburg,

Pa.

Aircraft

Radio

Corp.

Boonton,

N.J.

Sangamo

Electric

Co.,

Cap.

Div.

Marion,

III.

Los

Angeles,

Calif.

Los

Angeles,

Calif.

Milwaukee,

Wis.

Beverly Hills,

Calif.

Inc.

Culver

City,

Calif.

Goe

Engineering

Co.

CarlE.Holmes

Corp.

Allen

Bradley

Co.

Littofl

Industries,

Inc.

Pacific

Semiconductors,

Texas

In~truments.

Inc.

Semiconductor

Components

Div.

Dallas,

Texas

The

Alliance

Mfg.

Co.

Alliance,

Ohio

Chassi-Trak

Corp.

Indianapolis,

Ind.

Amerock

Corp.

Rockford, III.

Pulse

Engineering

Co.

Santa

Clara,

Calif.

Ferroxcube

Corp.ofAmerica

Saugerties,

N.Y.

Cole

Mfg.

Co.

Palo

Alto,

Calif.

Amphenol

Electronics

Corp.

Chicago,

III.

Radio

Corp.ofAmerica

Semiconductor

and

Materials

Div.

Somerville,

N.J.

Vocaline

Co.ofAmerica,

Inc.

Old

Saybrook,

Conn.

Hopkins

Engineering

Co.

San

Fernando,

Calif.

G.E.

Semiconductor

Products

Dept.

Syracuse,

N.Y.

Apex

Machine

& Tool

Co.

Dayton,

Ohio

Eldema

Corp.

EI

Monte,

Calif.

Transitron

Electronic

Corp.

Wakefield,

Mass.

Pyrofilm Resistor

Co.

Morristown,

N.J.

Air

Marine

Motors,

Inc. Los

Angeles,

Calif.

Arrow,

Hart

and

Hegeman

Elect.

Co.

Hartford,

Conn.

Elmenco

Products

Co.

New York, N.Y.

Hi-Q

DivisionofAerovox

Myrtle

Beach,

S.C.

Elgin

National

Watch

Co.,

Electronics

Division

Dymec Division

of

Hewlett-Packard

Co.

Special

Tube

Operations

of

Sylvania

Electronic

Systems

Mountain

View,

Calif.

Motorola.

Inc.,

Semiconductor

Prod.

Div. Phoenix,

Arizona

Filtron

Co.,

Inc.

Western

Division

Culver

City,

Calif.

Automatic

Electric

Co.

Northlake,

III.

Twentieth

Century

Plastics, Inc.

Los

Angeles,

Calif.

Westinghouse

Electric

Corp.

Semi-Conductor

Dept.

'Youngwood,

Pa.

IIlumitronic

Engineering

Co.

Sunnyvale,

Calif.

Barber

Colman

Co.

Rockford, III.

Metropolitan

Telecommunications

Corp.,

Metro

Cap.

Div. Brooklyn, N.Y.

Stewart

Engineering

Co.

Soquel,

Calif.

The Bassick

Co.

Bridgeport,

Conn.

Beede

Electrical

Instrument

Co.,

Inc.

Penacook,

N.H.

Torrington

Mfg.

Co.,

West

Div.

Van Nuys,

Calif.

00334
00335
00373

00656

00779

00781

00853

07

1 1 5

Corning

Glass

Works

Electronic

Components

Dept.

00B66
00891

01121

01

255

01

281

01

295

05593

05783
06004
06555

0681

2

05624
05729

01

349

01

561

01

930

01

961

02114

02286
02660
02735

0477

3

05006
05277

04732

0471

3

04404
04651

02771
02777
03508
03705

03797

038

7 7

03888
039

5 4

04009

04062
04222

04298

00015-17

Revised:

17

October

1961

From: F.S.C.

Handbook

Supplements

H4-1

Dated

April

1961

H4-2

Dated

April 1961

i-O

01155-1

Model

722A

Appendix

APPENDIX

CODE

LIST

OF MANUFACTURERS (Sheet 2

of

2)

CODE

NO.

MANUFACTURER

ADDRESS

CODE

NO.

MANUFACTURER

ADDRESS

CODE

NO.

MANUFACTURER

ADDRESS

Evanston,

III.

Yonkers, N.Y.

Waltham,

Mass.

Palo

Alto,

Calif.

Burbank,

Calif.

New

York, N.Y.

Palo

Alto,

Calif.

Danvers,

Mass.

Jamaica,

N.Y.

Pasadena,

Calif.

So.

Pasadena,

Calif.

New

Rochelle,

N.Y.

Redwood

City,

Calif.

Wilco

Corporation

Renbrandt,

Inc.

Hoffman

Semiconductor

Div.

of

Hoffman

Electronics

Corp.

TechnologyInstruments

Corp.

of

Calif.

No.

Hollywood,

Calif.

Methode

Mfg.

Co.

Chicago,

III.

Weckesser

Co.

Chicago,

III.

Huggins

Laboratories

Sunnyvale,

Calif.

Hi-Q

DivisionofAerovox

Olean,

N.Y.

Solar

Manufacturing

Co.

Los

Angeles,

Calif.

Carlton

Screw

Co.

Chicago,

III.

Microwave

Associates,

Inc.

Burlington,

Mass.

J.W.Miller

Co.

Los

Angeles,

Calif.

Excel

Transformer

Co.

Oakland,

Calif.

Automatic

and

Precision

Mfg.

Co.

CBS

Electronics,

Div.ofC.B.S., Inc.

Axel Brothers Inc.

FrancisL.Mosley

Microdot,

Inc.

Sealectro

Corp.

Carad

Corp.

Palo

Alto

Engineering

Co.,

Inc.

Clevite

Transistor

Prod.

Div.ofClevite

Corp.

I

nternational

Electronic

Research

Corp.

Columbia

Technical

Corp,

Varian

Associates

Marshall

Industries,

Electron

Products

Division

Pasadena,

Calif.

Control

Switch Division,

Controls

Co.

of

America

EI

Segundo,

Calif.

Delevan

Electronics

Corp.

East

Aurora,

N.Y.

North

Hills

Electric

Co.

Great

Neck,

L.I., N.Y.

Indianapolis,

Ind.

Boston, Mass.

9796

6

95354
95987
96067
96095
96296
96330

96341

96

4 9 3

96501
97539

99957

98141
98220

98278

9 B2 9 1

98405
98734

98925

98978

991

09
99313
9951

5

99707

99800
99821

99848
99934
99942

000

C C

Computer

Diode

Corp.

000

D D

General

Transistor

THE

FOLLOWING

H-P VENDORS HAVENONUM-

BER

ASSIGNEDINTHE

LATEST

SUPPLEMENT

TO

THE FEDERAL SUPPLY

CODE

FOR MANUFACTURERS

HA DBOOK.

0000

C

Connor

Spring

Mfg.

Co.

San

Francisco,

Calif.

0000

F

Maleo

Tool

and

Die Los

Angeles,

Calif.

0000

H Philco

Corp.

(Lansdale

Division)

Lansdale,

Pa.

0000

I

Telefunken

(cia

American

Elite) New York, N.Y.

0000

L

Winchester

Electronics,

Inc.

Santa

Monica,

Calif.

0000

M

Western

Coil

Div.ofAutom4!tic

Ind.,

Inc.

Redwood

City,

Calif.

0000

N

Nahm-Bros.

Spring

Co.

San

Leandro,

Calif.

0000

P

Ty-Car

Mfg.

Co.,

Inc.

Holliston,

Mass.

0000

T Texas

Instruments,

Inc.

Metals

and

Controls

Div.

Versailles,

Ky.

0000

U Tower

Mfg.

Corp.

Providence,

R.1.

0000

V

Imperial

Electronics,

Inc. Buena Park,

Calif.

0000

W

Webster

Electronics

Co.

Inc.

New

York, N.Y.

0000

X

Spruce

Pine

Mica

Co.

Spruce

Pine,

N.C.

0000

Y

Midland

Mfg.

Co.

Inc. Kansas

City,

Kans.

0000

Z

Willow

Leather

Products

Corp.

Newark,

N.J.

000

A A British

Radio

Electronics

Ltd.

Washington,

D.C.

000

B B

PrecisionInstrument

Components

Co.

Van Nuys,

Calif.

Lodi,

N.J.

Los

Angeles,

Calif.

Quincy,

Mass.

Newton,

Mass.

Plainfield,

N.J.

Huntington,

Ind.

Festus, Mo.

New York, N.Y.

Attleboro,

Mass.

Madison,

Wis.

Texas

Instruments,

Inc.,

Metals

and

Controls

Div.,

Spencer

Products

Research

Products

Corp.

Rotron

Manufacturing

Co.,

Inc.

Woodstock,

N.Y.

Glendale,

Calif.

Los

Angeles,

Calif.

Union,

N.J.

Red Bank,

N.J.

Vector

Electronic

Co.

Electro

Cords

Co.

Victory

Engineering

Corp.

Bendix

Corp.,

Red Bank Div.

Gavitt

Wire

and

Cable

Co.,

Div.ofAmerace

Corp.

Brookfield,

Mass.

Burroughs

Corp.,

Electronic

Tube

Div.

Model

Eng.

and

Mfg.,

Inc.

Loyd

Scruggs

Co.

Area

Electronics,

Inc.

A.

J.

Glesener

Co.,

Inc.

San

Francisco,

Calif.

Good

All

Electric

Mfg.

Co.

Ogallala,

Neb.

Sarkes

TarIian,

Inc.

Bloomington,

Ind.

Boonton

Molding

Company

Boonton,

N.J.

R.M.Bracamonte&Co.

San

Francisco,

Calif.

New

Haven,

Conn.

Chicago,

III.

Koiled

Kords, Inc.

Seamless

Rubber

Co.

Radio

Corp.ofAmerica,

RCA

Electron

Tube

Div.

Harrison,

N.J.

Western

Fibrous

Glass

Products

Co.

San

Francisco,

Calif.

Cutler.Hammer,

Inc. Lincoln, III.

General

Electric

Distributing

Corp.

Schenectady,

N.Y.

Carter

Parts

Div.ofEconomy

Baler

Co.

Chicago,

III.

Chicago,

III.

United

Transformer

Co.

U.S.

Rubber

Co.,

Mechanical

Goods

Div.

Passaic,

N.J.

Bearing

Engineering

Co.

San

Francisco,

Calif.

Radio

Materials

Co.

Chicago,

III.

Augat

Brothers,'lnc.

Attleboro,

Mass.

Dale

Products,

Inc.

Columbus,

Neb.

Eleo

Corp.

Philadelphia,

Pa.

Gremar

Mfg.

Co.,

Inc.

Wakefield,

·Mass.

K F

Development

Co.

Redwood

City,

Calif.

Micro-Switcn

Div.ofMinneapolis

Honeywell

Regulator

Co.

Freeport,

III.

Universal

Metal

Products,

Inc.

Bassett

Puente,

Calif.

Sylvania

Electric

Prod.

Inc.,

Semiconductor

Div.

Woburn,

Mass.

Robbins

and

Myers, Inc. New York, N.Y.

Stevens

Mfg.

Co.,

Inc.

Mansfield,

Ohio

Insuline-Van

Norman

Ind.,

Inc.

Electronic

Division

Manchester,

N.H.

Raytheon

Mfg.

Co.,

Receiving

Tube

Div.

Raytheon

Mfg.

Co.,

Semi-

conductor

Div.

Scientific

Radio

Products,

Inc

Tru

Ohm

Prod.

Div.ofModel

Engineering

and

Mfg.

Co.

Chicago,

III.

Worcester

Pressed

Aluminum

Corp.

Worcester,

Mass.

Miami,

Fla.

Woodside,

N.Y.

New

York, N.Y.

Burbank,

Calif.

Sheridan,

Wyo.

Bridgeport,

Conn.

Allies

Products

Corp.

Continental

Connector

Corp.

Leecraft

Mfg.

Co.,

Inc.

Lerco

Electronics,

Inc.

National

Coil

Co.

Vitramon,

Inc.

87473
881

40

89473
89636
89665

901

79

82647

82866
82877

82893
831

48

831

86
83298
83501

83777
83821

841

7 1

84396

8441

1

84970

85454
85474

85660

B

591

1

86684

83594

9 3 3 3 2

90970
91418
91

506

91

637

91

662
91737
91

827

91

929

921

96

941

45

941

44

93369
9341

0

93983

941

48

Loveland,

Colo.

94154

Tung-Sol

Electric,

Inc.

Newark,

N.J.

941

97

Curtiss-Wright

Corp.,

Electronics

Div.

Carlstadt,

N.J.

9431

0

94682
95236

95238

95263
95264

95265
9527

5

Chicago,

III.

Sandwich,

III.

Quincy,

Mass.

Emporium,

Pa.

East

Newark,

N.J.

Chicago,

III.

Du

Bois, Pa.

Clifton,

N.J.

Greenwich,

Conn.

Wallingford,

Conn.

Chicago,

III.

Columbus,

Ohio

Defiance,

Ohio

New

York, N.Y.

Boston, Mass.

Jennings

Radio

Mfg.

Co.

San

Jose,

Calif.

J.H.Winns,

and

Sons

Winchester,

Mass.

Industrial

Condenser

Corp.

Chicago,

III.

Industrial

Products

Co.

Danbury,

Conn.

E.F.Johnson

Co.

Waseca,

Minn.

International

Resistance

Co.

Philadelphia,

Pa.

Jones,

Howard

B.,

Division

of

Cinch

Mfg.

Corp.

James

Knights

Co.

Kulka

Electric

Mfg.

Co.,

Inc.

LenI

Electric

Mfg.

Co.

Littelfuse

Inc.

Lord

Mfg.

Co.

C.W.Marwedel

Micamold

Electronic

Mt.

Vernon, N.Y.

Chicago,

III.

Des

Plaines,

III.

Erie, Pa.

San

Francisco,

Calif.

Mfg.

Corp.

Brooklyn, N.Y.

James

Millen

Mfg.

Co.,

Inc.

Malden,

Mass.

Monadnock

Mills

San

Leandro,

Calif.

Mueller

Electric

Co.

Cleveland,

Ohio

Oak

Manufacturing

Co.

Chicago,

III.

Bendix

Corp.,

Bendix

Pacific

Div.

No.

Hollywood,

Calif.

PhaostronInstrument

and

Electronic

Co.

South

Pasadena,

Calif.

Potter

and

Brumfield,

Inc.

Princeton,

Ind.

Radio

Condenser

Co.

Camden,

N.J.

Radio

Essentials

Inc.

Mt.

Vernon, N.Y.

Radio

Receptor

Co.,

Inc. Brooklyn, N.Y.

Resistance

Products

Co.

Harrisburg,

Pa.

Signal

Indicator

Corp.

New

York, N.Y.

Tilley

Mfg.

Co.

San

Francisco,

Calif.

Stackpole

Carbon

Co.

St. Marys, Pa.

Tinnerman

Products,

Inc.

Cleveland,

Ohio

Transformer

Engineers

Pasadena,

Calif.

Ucinite

Co.

Newtonville,

Mass.

Veeder

Root, Inc.

Hartford,

Conn.

Wenco

Mfg.

Co.

Chicago,

III.

Continental-Wirt

Electronics

Corp.

Philadelphia,

Pa.

New

Rochelle,

N.Y.

Zierick

Mfg.

Corp.

Mepco

Division

of

Sessions

Clock

Co.

Morristown,

N.J.

Times

Facsimile

Corp.

New

York, N.Y.

ElectronicIndustries

Association

Any

brand

tube

meeting

EIA

standards

Washington,

D.C.

Unimax

Switch, Div.

of

W.L.Max!on

Corp.

OxfNd

Electric

Corp.

Aero

Manufacturing

Co.

All

Star

Products

Inc.

Hammerlund

Co.,

Inc.

Stevens,

Arnold,

Co.,

Inc.

International

Instruments,

Inc.

New

Haven,

Conn.

Wilkor

Products,

Inc.

Cleveland,

Ohio

Raytheon

Mfg.

Co.,

Industrial

Tube

Division

International

Rectifier

Corp.

EI

Segundo,

Calif.

Watertown,

Mass.

Skokie, III.

Barry

Controls,

Inc.

Carter

Parts

Co.

Jeffers

Electronics

Division

of

Speer

Carbon

Co.

AllenB.DuMont

Labs.,

Inc.

Maguire

Industries,

Inc.

Sylvania

Electric

Prod.

Inc.,

Electronic

Tube

Div.

Astron

Co.

Switchcraft,

Inc.

7581

8

7591

5
76005
7621

0
76433

801

30

801

31

81

483

80207

76487

76530
76545
76854
77068

77221

773

4 2

77630
77634
77638
77764
78283
78471
78488
78553
78790
78947
79142
79251
79727

73905
74455
74861
74868
74970
75042
751

73

79963
80031

75378
75382

82376
82389

8141

5

81

453

818

6 0

82042
821

42

80248
8041

1
80486
80583
80640
81

030

821

70
82209
8221

9

00015-17

Revised:17October

1961

From:

F.S.C.

Handbook

Supplements

H4-1

Dated

April

1961

H4-2

Dated

April

1961

01155-1

i-1/i-2

c&J

MANUAL

CHANGES

MODEL

722A/AR

DC

POWER

SUPPLY

Manual

Serial

Prefixed:

105-

Manual

Printed

11-61

To

adapt

this

manualtoinstruments

with

other

serial

prefixes

check

for

errata

below, and

make

changes

shownintables.

Instrument

Serial

Prefix

Make Manual Changes

Instrument

Serial

Prefix

Make Manual Changes

105-

1,2

CHANGE

#1.

Figure

4-3

Change

reference

designator

R13

to

R14

Figure

5-4,

5-5

Change

reference

supply

voltage

to

+13.8

~0.2

volts

Paragraph

5-23

step

b,

Change

to

read:

".

+13.8

~0.2

volts"

until

the

meter

reads

CHANGE

#2

4/12/62

Figure

5-5

Change

Amplifier

Q12

from

2N247

to

2N274

P R I N

TED

I N

U.S.

A .