Hewlett Packard 427A User / service manual 3.4 MB)

o

ERATING

AND

SERVICE

MANUAL

VOLTMETER

427A

ctf;

HEWLETT·

~ACKARD

FUNCTION

HEWLETT

427A

VOLTMETER

RANGE

i:IJ

PACKARD

=

.....----HEWLETT

The

Hewlett-Packard thoroughly specifications Packard

ments the

extent

tested

Company

are

traceable

allowed

whenitwas

ill

PACKARD---

CERTIFICATION

Company

and

inspected

further certifies that its

to

the

by

the

certifies that

and

shipped

U.S.

National

Bureau's

found

from

the

calibration

this

to

meet its

factory.

calibration

Bureau

facility.

instrument

published

The

Hewlett-

measure-

of Standards

....

was

to

WARRANTY

All

Hewlett-Packard products are warranted against defects in materials and workmanship. This warranty applies for one year from the date of delivery, or, nents listed will repair or replace products which prove to be defective during the

warranty Packard. liable for consequential damages.

Service contracts or customer assistance agreements are available for Hewlett-Packard products pair on-site.

For any assistance, contact your nearest Hewlett- Packard Sales and Service Office. Addresses are provided

in

the operating manual, for the specified period.

period

No

other warrantyisexpressed or implied.

provided

AND

in

that

ASSISTANCE

the case of certain major compo-

they

are

returned

require maintenance and re-

at

the back of this manual.

to

Hewlett-

We

are not

OPERATING

AND

SERVICE

MANUAL

-hp-

MODEL

Appendix

adapts manual

Part

No. 00427

-90005

427A

VOLTMETER

Serials Prefixed: 947-

C,

Manual Backdating Changes,

to

serials prefixed 550-,621-, 731-

Copyright Hewlett-Packard Company 1969

P.O. Box 301, Loveland, Colorado, 80537 U.S.A.

Printed:

AUG 1972

Model 427A

TableofContents

Section I GENERAL INFORMATION . .

1-1. 1-

5.

1-7. 1-10.

1-12. 1-13.

Description

Battery........

Instrument

Identification.

Available

Cables Probes

.....

and

Manual

. . . . .

Accessories.

and

Adapters

..••.....

Section II INSTALLATION

2-1. 2-3. 2-5. 2-7. 2-10. 2-12. 2-14. 2-16. 2-18.

Introduction Initial

Power Grounding

Installation

Bench Rack Combination

Repackaging

...

Inspection

Requirements

. . . . .

Mounting . . . .

Mounting

.....

Mounting

for

Shipment

Section

OPERATING INSTRUCTIONS

III

3-1. 3-

3-5. 3-6. 3-8. 3-11. 3-12. 3-13. 3-16.

3.

Introduction Front

and

Description

Operating

Mechanical Turn-On DC

Measurements Resistance AC

Measurements DB

Measurements

Rear

Panel

. . . .

Instructions

Zero

Procedure

Measurements

Section IV THEORYOFOPERATION

4-1. 4-5. 4-7. 4-9. 4-12. 4-13. 4-16. 4-19. 4-23.

GeneraL.....

DC

Operation.

Ohms

Operation

AC

Operation.

Circuit

Descriptions.

DC

Amplifier

DC

Offset

AC

Metering

Battery

RegulatorA1•

•.....•..

. . . .

(A1). . . . . .

(A2) . . • • . . .

Circuit

.

Adjustment

. .

.

. . . . .

.

....

(A2). .

TABLE

Page

.

Page

1-1 1-1 1-1

1-1 1-1 1-1 1-1

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

3-1 3-1

3-1 3-1 3-1

3-1 3-1 3-1 3-2 3-2

4-1 4-1 4-1 4-1 4-1 4-2

4-2 4-2 4-3 4-3

OF

CONTENTS

Section V MAINTENANCE

5-7.

AC

5-14. 5-16. 5-18. 5-20. 5-25.

Adjustment

5-27. 5-30.

5-31. 5-32. 5-36. 5-38. 5-40.

Alternate

5-42. 5-45. 5-47. 5-50. 5-52.

Battery

5-54. 5-56.

Troubleshooting. 5-60. 5-63. 5-67.

AdjustmentofFactory

5-71.

5-73. 5-75. 5-77. 5-80.

Etched

5-82.

Section VI CIRCUIT DIAGRAMS. .

6-1.

Introduction..

Section

VII

REPLACEABLE 7-1.

Introduction

7

-4.

Ordering

7-6.

Non-Listed

(Cont'd)

Accuracy Response Resistance DC

Accuracy

AC

Rejection

Input

Impedance

and Procedures Cover

Removal

Amplifier

Offset

Adjustment. Regulator AC

Calibration

Resistance

DC

Calibration

Performance

and

Calibration

AC

Circuits Resistance DC

Circuits AC

Rejection

Impedance

Input

Replacement

Power

Supply . . . . .

DC

Amplifier

AC

Metering

Components A1R19*. A2C2* . A2R14* A2R16*

Circuit

PARTS.

Information.

Parts

and

Frequency

Check.

Accuracy

Check.

Check Calibration

. . . . . . .

. . . . .

Balance

Adjust

Infinity

Procedures.

. . . . .

Circuits

Check

. . . . .

. . . .

Circuit.

•

Board

...

....

. . . . .

Check.

.

. .

.

and

Zero

. . . .

Adjustment

Checks

. . .

.

Selected

Repair.

.

Page

5-1 5-2 5-2 5-3 5-3

5-4 5-4

5-5

.

5-5

.

5-5 5-6

.

5-6 5-6

5-6 5-6 5-7 5-7 5-7 5-7 5-7

5-8 5-8 5-8

5-8 5-8 5-9 5-9 5-9 5-9

Page

.

6-1

.

6-1

Page

7-1

. .

7-1 7-1 7-1

Section V

MAINTENANCE.......

5-1. 5-3. 5-5.

Number 1-1. 3-1. 3-2. 5-1. 5-2.

Specifications EffectsofHarmonic

DB

Range Required Resistance

01791-2

Introduction....

Required

Equipment.

Performance

Identification

Test

Equipment.

Accuracy

Checks

Distortion.

...

Check

Page

Appendix 5-1 5-1 5-1 5-1

LIST

Page

.

1-0 3-2

3-2 . ..

5-0

5-2

A CODE LISTOFMANUFACTURERS B SALES

AND

SERVICE

C MANUAL BACKDATING CHANGES

TABLES

OF

Number 5-3.

1% 5-4. 5-5. 5-6.

7

-1.

Resistors

Troubleshooting....

Power

Supply

AC

Metering

Replaceable

Voltages

Circuit

Parts

OFFICES

.

Voltages

Page

5-7 5-7 5-8 5-8

.

7-1

iii

TableofContents

Model 427A

Number 1-1. 1-2. 3-1.

3-2. 4-l. 4-2. 4-3. 4-4. 4-5. 5-l.

Model 427A 11096AHigh

LocationofFront

and Impedance Simplified DC

Operation. Ohms AC

Operation DC

Offset AC

Accuracy

Response

Voltmeter.

Frequency

Indicators.

Correction

Block

Operation

Circuit.

and

Check.

LIST OF

·.

Probe.

Panel

Controls

..

Graph

Diagram

·..

...

.. ..

..

Frequency

• .

·.

ILLUSTRATIONS

Page

1-0 1-1

3-0 3-3 4-0 4-1

4-2 4-2 4-3

5-0

Number 5-2. 5-3. 5-4. 5-5. 5-6. 5-7.

6-1. 6-2. 6-3.

7-1.

Resistance DC

Accuracy

AC

Rejection Input LocationofInternal Battery

Location Component Schematic

LocationofMechanical

Accuracy

Impedance

Replacement.

of Switch

Location.

Diagram

and

Linearity

Check.

Check .

Adjustments

Components

Check •

.

Parts

Check.

..

...

.

Page

5-2 5-2 5-3

.

5-4 5-5 5-7

6-2 6-3 6-3

7-0

iv

01791-2

Section

I

Model 427A

Figure

DC

VOLTMETER

Voltage

Accuracy:

Input AC

Overload:

Voltage

Frequency Accuracy:

Frequency

3dB---r----.------r-------.....-----,.....-----,------,

2dB "

IdB

Frequency

Ranges:

1, 3,

10

o

50

C).

Resistance:

Rejection: Hz and above) 100 affects volts

peak.

Ranges:10mVto300 V

10

1, 3,

RANGE

O.

01 V - 30 V 10 Hz - 1 MHz

100 V - 300 V 10 Hz - 100 KHz

\.

-+--,-p'--+----'F-~~:011"1/-+-\--\---l

O

1Hz

±100

sequence(9ranges).

±2%offull

reading

1200 Vdc on

sequence

Range:10Hzto1 MHz.

(OOCto500C).

Response:

5Hz

response

mVto±1000 V

scaleonany

10

megohmsonall

Superimposed

times

less

AC

10Hz

greater

than

1%.

any

range.

VOLTMETER

(10

ranges).

±2%OFFULL

10 mVto30Vranges.

'peakacvoltages

IMHz 2MHz

Maximum

rms

1-1.

Table

full

scaleina

range

ranges.

than

full

450

full

scaleina

SCALE

- \

(OOC

scale

.........

~

3MHz

1-1.

(60

Model 427A

Spec

ifications

Input

\

,

Response:

Over

Resistance Accuracy:

Polarity: Source

Floating

Power:

to

4MHz

Voltmeter

VOLTMETER

AC

Impedance:10megohms

mVto1 V

put;

load: 300 V/

ohms

RANGE X10

X100 X1K X10K X100K X1M X10M

ground. ohms--volts position.

763 Option 01: tion

±20%,

ranges;

Respondstothe

calibratedinrms

below.

425 V

Ranges:10ohms

center

±5%ofreadingatmidscale

Common

Current:

OPEN

20 pf on 3 Vto300 V

rms

momentarily,1Vrange

/rms

maximum

OHMMETER

scale(7ranges).

terminal

CIRCUIT

VOLTAGE

0.1

V

0.1

V

1 V

1 V 1 V

1 V

GENERAL

Input: Maybeoperatedupto

(Ohms input

input

volt

Battery

on

400Hz.

open

dry

operation

rear

cell

)

22-1/2

or

RCA VS102.)

(selectable

50Hzto

(Cont'd)

shunted

average

volts

forasine

above 1V

center

negative.

SHORT

openinany

when

instrumentisin off

battery.

andacline

panel).

1/2

W.

by 40pFon

ranges.

valueofthe

wave

and

range.

scaleto10

(OOCto+500C).

CmCUIT

CURRENT

10 rnA

1 rnA 1 rnA

100

J.LA

10

J.LA

1

J.LA

0.1

J.LA

500 Vdc

function

(Eveready

115or230 V

opera-

10

in-

input.

meg-

above

except

No.

1-0

01791-2

Model 427A

Section I

1-1.

DESCRIPTION.

1-2.

The compact, makingdcmeasurements measurements from from the 230 battery.

1-3. gives Battery useorisolation

1-4. containsalistofthe

1-5.

1-6. volt Typical operationor700

1-7.

Hewlett-Packard

self-contained

10 Hzto1 MHz, and

0.2

Model 427A

volt

The

the

Figure

fromO.3 mVto300

ohmsto500

lineorbyaninternal

operation

maybepowered

useofsolid

Model 427A

1-1

makes

from

shows

BATTERY.

The

dry

battery

cell,

battery

usedinthe

Eveready

lifeismore

hours

INSTRUMENT IDENTIFICATION.

1-8.

Hewlett-Packard ber.Ifthe numberonyour on

the

plied

first

title

with the

page of

manual

section instrument

this

Model 427Aisa

voltmeter.

from

1 mVto1000

voltsatfrequencies

resistance

megohms.

state

both

the

common

the

Model427A,

Model 427A

No. 763oran

intermittent

AND

usesatwo-section

(serial

manual,

will

define the

With

either

22-1/2

components

ruggedness

instrument

mode

Specifications.

Model 427Aisa

than

300

MANUAL

prefix)

does

not

change

GENERAL

versatile,

It

is

capable

volts,

measurements

the01option,

by a 115

volt

dry

throughout

and

reliability.

ideal

ground

hours

operation.

agree differences

for

loops.

andTable

RCA VS102.

continuous

serial

of the

serial

with

sheets

SECTION

INFORMATION

of ac

or

cell

field

1-1

22-1/2

num-

those

sup-

be-

I

tween

your

in

this

manual.

ter

separating

letter

indicates

was

manufactured.

1-9.Ifa instrument states.

1-10.

AVAILABLE

1-11.

The

crease

the

1-12.

CABLES

-hpmale

-hpclips

-hpprobe

-hpplug

1-13.

PROBES.

-hpextends

factor

-hp-

Divider

-hptends The

voltage

instrument

Some

the

two

the

country

letter

prefixes

was

manufactured

following

test

capabilitiesofthe

AND

11001A 11002A 5' 11003A5'test 10111A

Model

and

adapter

the

of 10.

for

the

frequency

45"

test

alligator

shielded

1l074A

voltage

1l039A

measuring

1l096A range

and

the Model 427A

serial

numbers

sectionsofthe

in which

the

serial

outside

ACCESSORIES.

accessories

ADAPTERS.

test

lead,

dual lead-dual lead-dual

clip BNC

femaletobanana

10:1 Voltage range

of Model 427A by a

1000:1

Capacitive

voltagesupto

High

Frequency

range

isO.25Vto30V.

ofthe

described

may

have a

number.

the

number,

are

availabletoin-

Model 427

bananatoBNC bananatoalligator bananatopencil

Divider

Probe

427Ato500 MHz.

instrument

the

United

A.

Probe

Voltage 24 KV.

ex-

This

the

let-

01791-2

Figure

1-2.

1l096A

High

Frequency

Probe

1-1

Model 427A

Section II

2-1.

INTRODUCTION.

2-2.

This

tions

necessary Voltmeter.

427A cedures, ation,

2-3.

2-4.

power

and

INITIAL

This

instructions

mechanically

shouldbephysically

section

perfect this,

electrical

the

instrument damageintransit. anceofthe

contains

for

Included

and

INSPECTION.

instrument

and

electrically

order

instrument

installation

information

are

grounding

for

repackaging

was

carefully

and

initial

requirements,

before

and

shipping

inspection

for

inspected

shipment.

freeofmarsorscratches

upon

shouldbeinspected

receipt.

Also,

test

using

the

procedure

To

for

electrical

outlined

Paragraph5-5.Ifthereisdamageordeficiency,

the

warrantyonthe

2-5.

POWER

2-6.

The for is

included, source With source, panel)

Model 427A

its

primary

of 115or230

the

instrument move

until

the

dissipationisless

2-7.

GROUNDING

2-8.

To Electrical mends ed. conductor appropriate offset is

2-9.To

the

protect

that

The

pinonthe

the

ground

preserve

instrume:lt

Manufacturers'

the

Option01427Aisequipped

power

receptacle,

prongtotwo-prong the

adaptertoground.

2-10. 2-11.

INSTALLATION.

The

Model 427Aisfully

fore,nospecial

instrument

temperature

should notbeoperated

exceeds

information,

Sales

and

locations. 2-12.

2-13.

Service

)

BENCH MOUNTING.

Model 427Aisshipped

standinplace,

inside

front

REQUIREMENTS.

uses

power

Model 427A

a 22. 5

source.

canbeoperated

volts

(±20%)at50to400 Hz.

disconnected

the

slide

desired

operating

switch

line

than

voltage

1/2

watt

REQUIREMENTS.

personnel,

Association

instrument

cable

panel

which, when plugged

grounds

power

cable

wire.

the

protection

fromatwo-

adapter

contact

and

coolingisrequired.

+550C (1310F).

address

inquiriestoyour

Office. (See Appendix B

with

ready

for

useasa

coverofthis

volt

dry

However,

from

cell if Option01

theacpower

(locatedonthe

appears.

maximum.

the

(NEMA)

and

cabinetbeground-

withathree-

the

instrument.

three-prong

feature

connect

outlet,

when

useathree-

the

transistorized;

However,

where

the

For

local

plastic

bench

feet

instrument.

National

connector

pigtail

additional for

01791-3

SECTION

INSTALLATION

2-14.

instruc-

of Model

pro-

install-

shipment.

both

It

and confirm physical perform-

see

manual.

battery

from

any

rear

Power

recom-

into

an The

operating

on

there-

the

ambient

-hpoffice

and

tilt

in

2-15. Adapter er

frameisa

of

submodular

2-16.

2-17. with

(-hpcarrying top bining unit units. or

rack

instrument.

2-18.

2-19.

for to

Paragraph

used;

2-20.Iforiginal follows:

2-21.Iforiginal as

follows:

II

RACK MOUNTING. Model 427A

Frame

COMBINATION MOUNTING.

The

Model 427A

other

submodular

Model 1051A).Ifthe

handle,itwillbenecessarytoremove

cover

on 427A

Case.

which

accepts

Beingafull-module

mounted andisanalogoustoany

REPACKAGING

The

following

repackagingofthe

2-21ifitisnot.

------NOTE-------

If

the Hewlettattachatagtothe the

owner repairtobe model the

instrument. identify serial

Place

a.

original container est

Ensure

b.

strong

a.

Wrap before

b.

Place strument strips.

c.

Place cartonorwoodenbox and or

metal

d.

Mark INSTRUMENT, "

(-hp-

rack

mayberack

Part

frame

mounted by

No. 5060-0797).

that

accepts

units.Itcanberack

maybemounted in

unitsbyusing

427Aisequipped with a

before

The

various

2-20ifthe

insertingitinto

Combining

combinationsofsubmodular

FOR

paragraphs

instrument

original

Caseisa

unit

itself,itcanbebench

SHIPMENT.

containageneral

for

containeristo

instrumentistobeshipped

Packard

for

serviceorrepair,

instrument

and

indicating

the

accomplished;

number

number,

and

full

In any

the

instrumentbymodel

and

serial

correspondence,

number

containeristobeused,

instrumentinoriginal

containerisnot

available,asuitable

canbepurchased

-hp-

Sales

and

Service

that

containeriswell

tapeormetal

bands.

containerisnottobe

instrumentinheavy

placinginan

packing

and

protect

instrument

material

and

inner

around

panel

inner

seal

bands.

shipping

container

with

"FRAGILE"

using

The

any

adapt-

combination

mounted only.

combination

a Combining

Case

the

Com-

full-module

guide

shipment.

Refer

be

to

identifying

service

include

number

or

the

of

number,

prefix.

proceed

container.

from

your

as

If

near-

Office.

sealed

with

used,

proceed

paperorplastic container.

all

sidesofin-

face

with

cardboard

containerina heavy

with

strong

tape

"DELICATE

etc.

2-1

an

Section

III

MODEL

427A

FRONT PANEL

MODEL

427A

REAR PANEL (OPTION

o

LINE

Model 427A

01)

CD

o

CD

3-0

,/

BATT/LINE lects

either

115/230 either

Line input (option01only): operating

RANGE switch: unknown input.

DC

ZERO/n

ly

zero

set

the

OHMS to

instrument.

(option01only)

batteryorline

slide

switch

115 Vacor230

powertoinstrument.

oothumbwheel: Used to

the

instrumentinDC

instrumentinOHMS

terminal:

(option01only):

Vac

Selects

Connects

Figure

slide

switch:

operation.

for

line

Connects

appropriate

modeandtoinfinity-

mode.

unknown

3-1.

LocationofFront

Selects

operation.

ac

range

electrical-

resistance

Se-

CD

COM

terminal:

mon. (Common input

DCV.)

VOLTS voltage

FUNCTION switch:

@

®

Controls

Selections

and AC.

Mechanical

meter.

Meter resistance tively.

of

Panel

terminal:

to

face:

and

Connectstoinstrument

for

ACV,

OFF,

zero:

Displays

voltage in

Applies

Selects

BATT, +DC, -DC,

Mechanically

the

magnitude

ohmsorvolts

instrument.

are

or

Indicators

OHMS

and

unknownacor

mode of

operation.

zeroes

of unknown

the

respec-

01791-2

com-

dc

OHMS

Model 427A

Section III

3-1.

INTRODUCTION.

3-2.

The meter,acvoltmeter, section of

operation.

3-3.

3-4.

427A of

each.

standard

3-5.

3-6. 3-7.

the

Model 427A

contains

FRONT

Figure

controls

MECHANICAL ZERO ADJUSTMENT.

Before

Mechanical

a. Be

b.

3-1

and

The Option01rear

rear

panelisblank.

OPERATING

----To

obtain

set

the

when

the

any

sure

one

minute.

Rotate CLOCKWISE until of

zero

maybeoperatedasa dc

ohmmeterordB

operating

AND

shows

indicators

maximum

FUNCTION

instrumentisnot in

measurements

Zero

instrument

Mechanical

and moving

instructions

REAR

PANEL

the

locationofall

INSTRUCTIONS.

NOTE-----

switchofOFF

Adjustmentinthe

has

Zero

meter

upscale

OPERATING

meter.

for

DESCRIPTION.

and

explains

panelisshown.

battery

life,

use.

are

made,

following

been

off

Adjustment

pointer

toward

SECTION

volt-

This

each

mode

the

Model

the

function

The

complete

steps.

foratleast

screw

istothe

left

zero.

III

INSTRUCTIONS

3-10.

OPTION 01 INSTRUMENT.

Select

a.

b.Ifline

c.

3-11.

DC MEASUREMENTS.

a.

b. Short

c.

d.

either

rear

panel

tery

operationisselected,

accordingtoParagraph

operationisselected,

slide

switchtoindicate

age. Rotate

function.

1. 5 MIN

the

Option01power should any

range,

15

voltsormore.

of venient

Rotate

-DCV depending on

the

tate

RANGE

nco

thumbwheel

Remove

zero

offset

to

Paragraph

Select

approximate

switch.

batteryorline

BATT/LINE

the

FUNCTION

During

check

be

1. 5

checkofthe

the

VOLTS inputtothe

shorting

line

position

supply. The

or

higheronthe

indicating

Option 01

FUNCTION

with

the

toO.1, and

for

zero

connection.Ifthereisa

COM

4-16

and

range

operation

slide

switch.Ifbat-

check

3-9.

set

the

proper

switchtothe

operation,

displays

a power supply output

This

servesasa

switchto+DCV

polarityofthe

COM

adjust

meter

and VOLTS open,

Paragraph

of input with RANGE

with

the

battery

the

115/230

line

volt-

desired

the

BATT/

the

output of

reading

0-3

scale

input,

5-30.

con-

supply.

input.

ro-

refer

power

theDCZERO/

deflection.

the

on

or

c.

Continuetorotate STOP when needle

overshoots,

d. When

3-8.

TURN-ON PROCEDURE.

3-9.

ST

a.

b.

01791-2

pointerisexactly adjustment WISEtorelieve the

pointer procedure, rotation

ANDARD INSTRUMENT.

Rotate

the

MIN position.

The

meter

0-3

scale battery readingisbelow 1. 5, accordingtothe

adjustment

needleisexactlyonzero.

repeat

screw

slightly

tensiononsuspension.

movestothe

but

make

less.

FUNCTION SwitchtoBATT/I.

should

on any

voltageis15

the

read

range,

voltsorhigher.Ifthe

stepsinParagraph

screw

step

b.

over

zero,

COUNTERCLOCK-

left,

repeat

counterclockwise

1. 5

or

higheronthe

indicating

replace

the

clockwise.

rotate

If

whole

that

the

battery

5-54.

If

3-12.

DO NOT

1200

e.

Connect input minals

RESISTANCE MEASUREMENTS.

VDC

and

APPLY

read

MORE THAN

TO

ANY

DC RANGE.

across

VOLTS and

magnitude of input on

COM

ter-

meter.

[~~:~f.!~~B

DAMAGE· TO 427A INPUT Cffi-

MAY

CUlT AC

VOLT

5

OHMS

Rotate

a. b.

Select switch; and with just

theDCZERO/nco thumbwheel indicationonthe restonthe

the

RESULTIFDC

AGEISAPPLIED TO

TERMINAL.

FUNCTION

approximate

mark

switchtoOHMS. range

the

input

ohms

scale.

justtothe

OR

with

terminals

(Pointer

leftofco).

the

RANGE

open,

foranco

should

ad-

3-1

Section

ill

Model 427A

c. Connect

OHMS

tance

3-13.

AC

3-14.

The

of

theacinput andiscalibratedinrms

sine

wave input. Since

value

of a distortiononthe reading. tortion

Table

on a

the

unknown

and

COM

accuracy,

range

pointer

scale.

terminals.

the

NOTE-----

that

near

value on

---For

ohms meter of

the

best

MEASUREMENTS.

Model 427A

respondstothe the

non-sinusoidal

input

3-1

will

shows

signal affect the

reading.

resistance

ohms

select

will

the

average

effectofharmonic

----NOTE----The

following

tableisuniversalinapplication these

errors

all

average-responding meters. may

vary

ship

between

The

with

are

error

the

inherent

shown above

phase

harmonic

fundamental.

Table

3-1.

EffectsofHarmonic

INPUT VOLTAGE TRUE RMS

CHARACTERISfICS VALUE

Fundamental Fundamental+10%

second

harmonic

Fundamental+20%

second

harmonic

Fundamental+50%

second

harmonic

Fundamental+10%

third

harmonic

Fundamental+20%

third

harmonic

Fundamental+50%

third

harmonic

3-15.

Use

the

= 100

following

100 100

100.5

/

..

102

112

100.5

102

112

stepstomakeanac

ment.

a.

Rotate

FUNCTION

switchtoACV.

----NOTE----With

the

input maybea two

minor causedbythe the

meter

the

accuracyofac

the

meter

shorted,

zero

offset

divisions.

bias

bridge

moves

current

and

does measurements upscale.

3-2

Read

scale.

an

place

the

center

average

value

are

different,

the

accuracyofthe

since

in

volt-

relation-

and

Distortion

METER

INDICATION

100

100 - 102

100 - 110

there

of about

This

is

through

not

affect

across

the

resis-

volts

and

the

96 - 104

94 - 108

90

- 116

measure-

as

the

value

for

rms

any

dis-

Rotate

b.

RANGE

of input

DO NOT

switchtoapproximate

voltage.

APPLY

MORE THAN 425V

range

RMS WHEN THE INSTRUMENT IS ON

RANGES ABOVE 3, OR MORE

THAN 300V RMS

LOW

3.

c.

a

Connect VOLTS and

the

magnitude on

3-16.

DB MEASUREMENTS.

a.

Making adBor

tially

the

sameasmakinganac

Follow

read

the

1 volt

0 dBm

range.

b.

surement. but

The the isa10dBincrease, 1

voltisa10dB

thedBvalueofeach

Table

3-2.

DB Range

RANGE DB

300 +50 100

30 10

3

c.

A given dB sumofthe

+40 +30 +20 +10

readingisequaltothe

range example,ifthe the

instrument

d.

e.

range, 6

The is 600n ments of 600n. ances

To pedance

the

dB=14

dB.

427A

meteriscalibratedindBm.

equivalenttoO.

load. Consequently, any dBm

mustbemade

Measurements

will be in dB, not

convert

a dB

Correction example,toconverta+30dBreading acrossa50n load

impedanceonthe Follow black at +10.5 +40.5

that

the

line

point.

dBm,

dBm.

and

ON

RANGES

signaltobe

COM

the

voltage

dBm

the

magnitude on

measuredtothe

terminals

scale.

measurementisessen-

stepsinParagraph

thedBscale.

positionofthe

Each

position

and

each

decrease.

range.

Identification RANGE DB

1 0

0.3

0.1

0.03

0.01

and

the

meter

reading

wereonthe10volt

final

reading

wouldbe20

775 volt

acrossatotal

across

dBm.

readingtodBm,

Graph

loadtodBm,

bottom of

impedance

read

The

and

the

correction

the

corrected

linetothe

meter

BE-

and

voltage

RANGE

position

Table

reading. were-6and

dropped

other

(Figure

locate

correction

for

reading

read

the

mea3-13,

switch

is

above 1 volt

below

3-2

lists

-10

-20

-30

-40

algebraic

For

(+20

dB)

dB -

OdBm

across

measure-

impedance

imped-

use

the

Im-

3-2).

For

made

the

50n

the

graph.

heavy 50n

is

a

01791-2

Model

427A

~

m

o

I

Z

o

~

u

W

0:: 0::

o

U

0:: W

~

W

~

+25

+20

+15

+10

+5

-5

-10

Section

,

'"

,

ill

,

I'

,

'"

,

"

,

"

o

"

I'

,

"

,

"

,

"

01791-1

-15

-20

-25

,

"

,

"

,

"

I

10

100

IK

IMPEDANCE

Figure

3-2.

Impedance

Correction

10K

OHMS

Graph

lOOK

STO-Il-0477

3-3

OFFSET DC

ADJUST (A2)

AC

DC/OHMS

DC

(AI)

AMPLIFIER

.

AC

POST H

AC

ATTENUATOR CIRCUIT

VOLTAGES

SUPPLY

Diagram

.

VOLTS}

VOLTS

Block

DC

(AI)

FILTER

~

RANGE DC

ATTENUATOR

~

+6.7

-6.7

COMMON

Simplified

4-1.

~

RANGE

OHMS

ATTENUATOR

~

RANGE AC

ATTENUATOR

~

(AI)

BATTERY

REGULATOR

Figure

1

+DC

OHMS INPUT

-DC

AC

OHMS

FUNCTION

SELECTOR

VOLTS INPUT

I

POWER

SUPPLY

01

r:-::--------,

I OPTION

LINE

I

I I

~

BATTERY

L

I I

427A-ROA

I

~

o

I

-.:J

....

CD

o

....

Model 427A

Section IV

4-1.

GENERAL.

4-2.

The Model 427A

and

resistance. tion 01, shows a

4-3. tery plytothe the

(A2). The

gain

It

AC preamplifier, to

The

theacinput. 4-4.

leakage OHMS

4-5.

4-6. of Range each tenuator

anyacsuperimposed

input. The dc output of

plifier(A1)

matches low

canbepoweredbyline

simplified

The

Battery

output and

amplifiers.

DC

Amplifier

formerisa high input

amplifier

also

servesasa

Metering

the

average

meteriscalibratedtodisplay

The

CAL

DC

Figure

Operation.

Attenuator

stepofthe

impedanceofthe

converts

DC

currentfrom

are

OPERATION.

4-2

goestotheDCFilter,

and

the

high

measuresacvoltage,

It

is

battery block Regulator

provides

The

(A1) and

usedtoamplify

preamplifier

Circuit

ac,

Offset

attenuator

amplifiesacsignals

them

and

Adjust

thedc

resistive

shows

The dc inputisfirst

the

whereitis

noise

thentothe

impedanceofthe

meter.

THEORY

operated,

diagramofthe

+6. 7 and -6.7 volt

connects

circuits

. Thedc

the

voltage.

(A1)

regulates

427A

uses

theACMetering

dc and

to dc

(A2)

amplifier,

Model 427A in

attenuatedby10dB

that

filter

meter.

two

impedance

resistance

foracsignals. signals

themtothe

the

compensates

andDCCAL

used

for

appliedtothe

signal

and

the

maybepresentonthe

goestotheDCAm-

TheDCAmplifier

attenuatortothe

The DC CAL

SECTION

dc voltage,

but

with

Op-

Figure

the

bias

Circuit inputs.

from

meter.

value

the rej

circuits

4-1

bat-

sup-

unity

The

the

for

DC for at-

ects

427A.

amplifiers,

proportional rms

calibration.

theDCMode

from

filter

OF

of

and

IV

OPERATION

are

resistive

to

adjust

ranges.

4-7.

OHMS

4-8.

Figure

in

the

OHMS Raand Rb Rbcauses

The

OHMS indication to

the

parallel sistance half

the into the cation

will

so

that

the centerofthe rangeisa

4-9.

AC

4-10.

Figure

in

theACMode of

theAC

Range

low,

the butonall by50dB. of

the

attenuator

signal

from theDCAmplifiertothe is

attenuatedby10dBfor selector. danceofthe

the

Range

circuitsinseries

the

meter

OPERATION.

4-3isa block Mode of

form

full

CAL of00with

from

parallel

amplifier

be half

full RANGE

center

OPERATION.

4-4

Attenuator.

signalisnot

the

CapacitorC3adjusts

the

TheDCAmplifier

Post

Attenuator,

Operation.

a voltage

scale

currenttoflow

circuit

the

combination

the

OHMS

combination

willbehalved, and scale.

scale.

scale

shows a block

Operation.

affectedbytheACRange

higher

with

AC

Range

Attenuatortothe

with

currenttocalibrate

diagramofthe

divider.

adjusts

the

input open. When Rxis

ofRaand

terminaltoground

ofRaand Rb,

TheModel

setting

For

ranges,

actingasa

willbedisplayedinthe

example,

reading.

The input

On

the

a 3 volt 100

Attenuator

AC

Post

each

matches

the

With

the input open,

Thevoltage

through

meter

current

Rb'

the

427A

10

diagramofthe

signal

1 volt

range

signalisattenuated

frequency

KHz

goes Attenuator step

of the RANGE the

high

impedance

preamplifier.

meter

used

the

lower

Model

427A

across

the

meter.

for

equal

the

total

will

the

voltage

meter

indi-

is

designed

n on

the

427A

goes

and

Attenuator;

response

input. The

through

where

low

impe-

an

re-

be

X10

to

be-

it

of

r

t

01791-2

I

VOLTSI

ATTENUATOR

~

Figure

4-2.

DC

FILTER

DC

FEEDBACK

Operation

4-1

Section IV

427A-RO

~

OHMS

ATTENUATOR

..JI\\-

+6.7V

Model 427A

"""",",

FEEDBACK

r'

t

E

1N

Figure4-3.

...---411-----0

FEEDBACK

Ohms

Operation

AC

POST

ATTENUATOR

~

•

~OM>-I_------e

427A-ROA

4-11.

TheAC stabilizedacamplifier The

meter

age

proportional output. A2R17 so

that

4-12.

4-13.DCAMPLIFIER 4-14.

Model 427A. The input to applied AIQ6. A field dance input impedance. up a twofollower output of AlQ9isfed bilization.

4-15.

AlQ8

The

constant

AIQ6 and 4-2

MeteringCircuitcontains

circuit

converts

to the

scale

6-3isthe

through

stage

actsasa

helps

adjusts

readingisin

DESCRIPTIONS.

Pin2to

effect

becauseofits

Transistors

amplifier,

stage.

backtothe

current

minimize

the

CIRCUIT

Figure

converter

./

andan

averaging

theacsignal

averageoftheacamplifier

the

current

rms

(AI).

schematic

the

transistorisusedasthe

constant

from

impedance

characteristically

with

The

signal

base

current

AlQ8

drift.

both a

meter

to a dc

through volts.

diagramofthe

DC

Amplifier

AIQ7 and AIQ9

AlQ9asan

from

of AlQ7

for

source

assures

Figure

feedback

circuit.

the

meter

(AI)

converter

impe-

make

emitter

the

emitter

gain

for

AIQ6.

linearity

4-4.

volt-

high

sta-

AC

is

in

I

V

Operation

4-16.DCOFFSET 4-17.

The fraction with

through resultingina few ranges. input open and

When

mostly

does

compensated

across 4-18.

compensates voltage tapped reverse extremely passes

tenuator, adjusting

each

gate

of a nanoamp.

the

input

theDCRange

Consequently,

measuring

through

not

effect

high

The

DC

leakage

high

through

in a

A2R7, IR

other.

The net voltage

impedances

AC

FEEDBACK

(A2).

leakage

shorted;

with

the

for,itwill

Offset

for

from

direction

fromAlQ6

This

but

with

Attenuator

millivolts

the

across

low

the

A2R7

current resistance the

canbesetsothatitand

meter

input

shorted

a low

impedance;

measurement

effect

(>1

M

Circuit

leakage

reverse

from

much

at

lower

oppositetothatoflasS.

drop

(lasS)

currentisinsignificant

the

resistanceof10

deflectiononthe

impedance,

measurements

n).

(A2)

from

A2CRI (lR)

the

resistance

across

amountstoa

input open,itflows

indications

canbedifferent.

and

this

Unless

(see

Figure4-5)

AlQ6. A

biases

A2CRl.

gate

of AIQ6 and

lass

the

Mn

lower

with

lasS

flows

difference

lasS

made

positive

The

meets of the

cancel

attenuator

01791-2

the

is

at-

an

By

Model 427A

r

I~OA2

a

R6 R7 5

I

I I

L

---

~

~gjtFlrSET

'CRI

11---

I

(-+6.75V

I

J

1

- - - 2 - - -

rts

I <>

RESISTANCE

I

<)

OF

ATTENUATOR

I.I~.~EGOHMSl

Figure

would

thenbezero. mizing ment connectedtothe

teristic

input

the

effectsofIGSS

with

the

shorted.

quite

4-5.

DC Offset

An

alternative

impedanceofthe

input

A2CR1

similartothat

wouldbeto

terminals

hasatemperature

--T-O

RIO

Circuit

method of

zero

measurement

rather

of A1Q6.

-EM~~:l

OF AIQ7

-6.75V

the

instrusource

than

with

charac-

Therefore.

,.

mini-

the

Section

both

IGSS and IR change by amount with errorathigher

4-19. 4-20.

Metering

tenuatorisapplied

A2Q2isan matchingtocommon Capacitor stabilization.

4-21.

fied by A2CR3 and A2CR4 and appliedtothe

I

I I

movement.

4-22.

fieratlow

meter A2C3isusedtocalibrate quency. With a10mY. 1 MHz input. A2C3isadjusted

for

full

4-23.

4-24.

from

the supply. emitter-base

reference A1Q5 trols current and CR5

sistor

keep

temperature

temperaturesislessened.

AC

METERING CIRCUIT (A2).

Figure

The

Resistor

deflection

BATTERY REGULATORA1(See

The

senses

A1Q2.

A1Q4

its

6-3

Circuit.

e"mitter

A2C4

output

scale.

Battery

22. 5 volt The

for

source

provide voltage

contains Theacinput through

providesanac

from

A2R17isusedtocalibrate

frequency

witha10

batteryorfrom

voltage

junctionofA1Q3

the

power

changesinthe

the

positive for

temperature

providesacurrent

constant

follower

Regulator

approximately

and

the

A2C1

that

emitter

andisadjusted

drop

A1Q5. and

output

feedback

the

collector

mY. 400 Hz input.

the

amplifierathigh

regulates

acrossA1CR2

provides

supply and

+6. 7 volt output and

series

stabilization.

under

amount of

schematicofthe

from

tothe

provides

the

regulator.

diodes

shunt

heavy

the

additional

theacpost

base

impedance

stage

path

of A2Q3isrecti-

the

for

full

Figure

thedcvoltage

optional

and

the

-6.

7 volt output.

A1Q1isa

A1CR3. CR4.

for

A1CR2

current

IV

same

AC

at-

of A2Q1.

A2Q3.

for

gain

meter

ampli-

scale

Capacitor

fre-

6-3).

power

the

-6.

7 volt

con-

Tran-

to

loads.

01791-2

4-3

Section

V

Table

5-1.

Required

Test

Equipment

Model 427A

INSTRUMENT

TYPE

DC Voltage*

Standard

Test

Oscillator*

Variable

Transformer

Decade

DC

AC

Resistors

Line

Resistor

Voltmeter

Range: Accuracy:

Frequency Output: o

Frequency Voltage

Range: Accuracy:

Range:

Accuracy:

100 kO ± 1

MO±.1%

*

REQUIRED

CHARACTERISTICS

0-300

V

±O.2%

Range:10Hzto1 MHz

to

3 Vac

Range:

Range: o 100to10MO

±0.5%

0-50

±2%

0-50

±2%

.1%

Containedin-hp-

Vdc

Vac

50to60

to

120 V

E02-738BR

Hz

Performance

Troubleshooting

Performance

VTVM

Calibration

USE MODEL

Checks

System

RECOMMENDED

-hp-

Model 738BR

meter

Calibrator

-hp-

Model 652A

lator

Power

stat

Type

General

-hp-

1432Z

Model 427A

meter

Model 427A

meter

Part Part

Radio

Decade

No. 0811-0460 No. 0811-0473

Volt-

Oscil-

116B

Model

Resistor

Volt-

5-0

VOLTMETER CALIBRATOR

hp73BBR

TEST OSCILLATOR

hp652A

VOLTMETER CALIBRATION SYSTEM

Figure

hp

(Q)

~

/§J

5-1.

AC

E02

- 738BR

0

I~l

©

@=@

Accuracy

0

oO~

ill

I..

and

Frequency

~

.......

"T'

lSI

Response

51

r----'

I I IA

:B

I

I I

I

L

____

Check

hP427A

VOLTMETER

~

@@

(j)(i)@-

I

I~

I

I I I

I

...J

<J)l

01791-2

Model 427A

5-1.

INTRODUCTION.

5-2.

This maintain describe

the Model 427A. The following

the

Procedures,

5-3.

REQUIRED

5-4.

Table properly

maintain modelisnot the

required

5-5.

PERFORMANCE

5-6.

The that These

spection

Check for the from

Performance

compare

procedures

and

Test

recording

performance

the

manual the incoming check.Ifthe cations, cedures'

5-7.

refer

Paragraph

AC

ACCURACY

section

contains

Performance

and

the

5-1isa

the Model 427A.Ifthe

available,

characteristics.

the

Model 427A with

canbeused

periodic

Cardisprovidedatthe endofthis

the

performance

checks.

and

inspectionorof a

Model 427A to the

CHECK.

5-8.

TheACAccuracy requiresatest from10Hz plied

voltage

-hp-

Model 738BR

400

Hz

dicated

signal

output. The canbeadjusted reference

Before

oscillator

to 1 MHz. The

mustbeaccurate

thatiswithin

towithin

from

10 Hz to10MHz.

beginning

Checks,besuretoadjust chanical the

5-9.

AC

5-10. Connect the

meter

stepsinParagraph

ACCURACY CHECK.

test

calibratorasshown in

a.

Set

the

voltmeter

voltsat400

Figure

b.

0.01 SetSlin

information

Checks,

Troubleshooting

EQUIPMENT.

listofthe

use

any

CHECKS.

Checks

are

both

inspection.

of the Model 427A

The

card

usedasa

does

Adjustment

and

5-25.

AND

FREQUENCY RESPONSE

and

Frequency

thatisflat

absolute

Voltmeter

Calibrator

less

-hp-

Model 652A

less

than

NOTE

the

Performance

zero

according

3-6.

oscillator,

Figure

5-1.

calibrator

Hz.

5-1 to

position

necessary

the

Procedures.

equipment

recommended

substitute

"in

cabinet"

its

specifications.

for

incoming

A

Performance

canberemoved

permanent

routine not

performance

meet

Calibration

Response

within ±O.5%

value of

within

±O.

than

0.2%

Test

0.25%

of a

the

me-

to

and

the

foranoutput of

A.

SECTION V

MAINTENANCE

meets

section

during

record

specifi-

Check

the

of the

desired

tests

in-

Pro-

ap-

The

in-

to

of

5-11. FREQUENCY RESPONSE CHECK.

5-12. is10Hzto10 tionedinthe the changed.

a

paragraphs Calibration

needed

that

its

2%.

produces

Oscillator

voltmeter

e.

Repeat selection meter for should not

stepsathroughdfor

through

calibrator

each

range.

vary than2%on any minor

divisions

minor

divisions

f.

Set

the Model 427A to

apply

0.9, 0.8,

0.1

volt

signals.

shouldbewithin

known input

g.

Set apply

In

1-1/2

the Model 427A to

each

signal.

2.5,

2, 1. 5, 1, and

case

minor

nal.

The

frequency

MHz. The

following

proper

a.

b.

c.

d.

amplitude

SetSlin

427A RANGE to

Model Set

the

output

0-1

scale.

Set

test

set

level

meter

indication.

Record

Figure

test

foraO.95indication

oscillator

control

set

level

ferenceinstepseand

e.

Change the reset

indication adjust The 427A

oscillator

the

oscillator

establishedinstepc.DO

the

set

indication

than±2minor

f.

Repeat

100 kHz, the

427A

stepefor

500

indication

than±2minor

300 Vbysetting

eachacRANGE

output to the

The Model

from

theknown

range.

on the 0-1

on the 0-3

0.7,

0.6,

In

each

two

minor

the

reading

divisions

rangeofthe

set

stepsisusedtore

each

time

5-1toposition

full

scale

427Aindication

inputby

2%

correspondsto2

scale

and

scale.

the

1 volt

case

range

0.3, the

0.5, divisionsofthe

the

3 volt

range

0.5

volt

should

be

of the known input

-hp-

level

Model 652A

indication

-establish

the

frequency

B.

0.01.

oscillatorto400Hzand

on the 427A

to expand, and

(REF

SET)

indication

for

adjust

convenient

useasa

f.

frequencyto10Hzand

amplitudetothe

level

controlonthe

should not

scale

divisions

oscillator.

varybymore

(±2%).

100 Hz, 1 kHz, 10 kHZ,

kHz and 1 MHz.

should not

scale

divisions

In

each

varybymore

(±2%).

Section

the

volt-

value more

1-1/2

0.2 reading

signals.

within

sig-

men-

Set the

adjust

set

level

NOT

case

V

and and

and

is

the

re-

c.

d. The

01791-3

Set the Model 427A FUNCTION to ACV and the

rangetoO.

427A should

(2

minor

scale

01. read

division).

0.01

volts

rms±2%

5-13.

Repeat

set

to 3

3 V

reading should not scale

divisions).

Paragraph

volts,

and

on 427Ainstep

varybymore

5-11

test

oscillator

than±2%(±1-1/2

with

the 427A RANGE

output

b.

The 427A

set

to give

reading

small

5-1

Section

V

Model 427A

5-14.

RESISTANCE ACCURACY CHECK.

5-15.

To

check

the

resistances

tance

1432Z

be

accuratetowithin

of10ohmsto10Mohms.

a.

b.

c.

d.

are

accuracy

Decade

With

the

FUNCTIONtoOHMS and X10. foranindication

(The

needle

the

left

Connect 427A

decade

The

427A

the

known

sion,+one-half

Repeat and

decade

5-2.

resistance

needed.

check

Resistor.

usingaGeneral

±O.5%and

input open,

Adjust

the

should

of

00).

the

decade

as

showninFigure

for10n.

meter resistance(-one

stepsathroughcusing

resistor

r-~'

accuracy.

Figure

5-2

The

resistance

should

set

the

DC ZERO/noo

of00on

should

small

the

restonthe

resistor

5-2,

read

small

division).

settings

DECADE RESISTOR

GENERAL RADIO 1432Z

:>

precIsIon

shows

the

Radio

havearange

Model 427A

RANGE

meter

mark

and

within

listedinTable

resis-

Model

used

should

and

the

face.

just

the

scale

RANGE

to

Model

set

±5%

adjustment

to

the

of

divi-

Table

5-16.

DC ACCURACY.

5-17.

TheDCAccuracy standard cated

output

738BR

Voltmeter ±O.1%of

test

setup a.

-----NOTE-----

The

DC ZERO/noo

need

only be

and X1K

RANGE

X100

X1K

X10K

X100K X1M 1 X10M

thatisaccuratetowithin

the

for

Set

the

ranges.

5-2.

Resistance

fromO.1

Calibratorisaccuratetowithin

indicated

theDCAccuracy

the

Model 427A FUNCTIONto+DCV and

RANGEtoO.

adjustment

madeonthe

Accuracy

Check

voltto300

output.

VOLTMETER

~

hp

Figure

1.

427A

0

X10

DECADE

1000 n

requiresadc

±O.2%of

V.

Check.

@@

@<i)<i)-

J J

100 n

10

Kn Kn

100

Mn

10

Mn

The

5-3

Check

its

-hpshows

427A-8-0~;n

voltage

indi-

Model

the

5-2

VOL

~

~~

(~

TMETER

0

Figure

hp

738BR

(/)

5-3.

5-2.

Resistance

CALIBRATOR

Q

fl)

cQ@

DC

Accuracy

and

Linearity

Check

hp

427A

VOLTMETER

~

0

@@

(j)<i)@1III

¥

4Z7.-8-0~)()

01791-3

Model

427A

b.

Adjust

the justment range.

c.

Connect Model

d.

Set volts volt

e.

Repeat selectionto300 V by calibrator

each not ±2% or

divisionsontheO-1scaleand

divisiononthe

f. Set

calibratorto300V.The read range.

g. Set

apply andO.1

calibrator. be

within

input

h. Set

apply 2. 5, 2, 1. 5, 1, andO.5 In

each

1/2

i.

Repeat setto-DCV foranegative be

the

DC ZERO/Qoo

need

onlybemadeontheO.1

the

voltmeter

427AasshowninFigure

the

voltmeter

dc.

The

±2%.

range.

vary

on any

thedcRANGEto1000 V and

300 V

the

Model 427Atothe1volt

0.9, 0.8, 0.7, 0.6,

voltage.

the

minor

setpsathroughfwith

same.

Model 427A

stepsathroughefor

outputtothe

The

from

voltdcsignals

Model

case

Mode1427A

the

range.

0-3

±2%offull

In

each

two

minor

427Atothe3volt

the

reading

divisiononthe

and

the

output.

WARNING

THE VARIABLE LINE TRANSFORMER PROVIDES A DANGEROUS AMOUNT THE CASE THE FUSED 5-19.

OF

TRANSFORMERISPROPERLY

THE 427AISGROUNDED AND THAT

BEFORE

PERFORMING

OF

for

zero.

This

calibrator

setting

full

known input by

2%

correspondsto2

scale.

Model

scaleonthe

from

case

the

divisionsofthe

shouldbewithin

0-3

voltmeter

The

and

5-3.

outputtoO.

should

readO.1

each

the

voltmeter

scale

value

indication

more

1-1/2minor

the

427A

1000

0.5,

range

0.4,

the

voltmeter

reading

range

voltdcsignals.

scale.

the

FUNCTION

calibrator

test

results

voltmeter

I

POWER. INSURE THAT

WIRED

PARAGRAPHS 5-18.

the

RANGE

should

than

should

0.3, should

known

should

AND

ad-

volt

1

for

min-

volt

and

set

0.2,

Section

a.

Set

the the theDCZERO/Qoo

b. Switch

to er

c.

Adjust of

d.

Switch RANGEtoO.

e.

The scale

f.

Repeat range

former.

5-20.

INPUT

5-21.

INPUT

5-22.

Figure

tance

check.

with

the

input, and

resistanC::il~

427A FUNCTIONto+DCV and

input. Set

the

10.

Connect

and

the

7.07 the

the

RANGEtoO.

for0meter

FUNCTIONtoACV and

the

Model

transformer

volts

427A FUNCTIONto+DCV and

variable

427AasshowninFigure

rmsonthe

output 427A.

1 and

indication.

line

forareading

the

transform-

1.

meter

reading

division).

-----NOTE-----

The

meter momentarily zero.

This

of

theDCFilter

is

normal.

stepsathrougheusing

and

70.7

IMPEDANCE CHECK. RESISTANCE CHECK. 5-5

shows

A 1 MQ

the

:~PPlied

shouldbe0 ± 1%(1minor

may

move

and

indicates

volt

the

resistorisconnectedinseries

voltage

( R

upscale

then

return

the

capacitors

rms

signal

setup

for

drop

across

i

:

: +

to

charging

and

the1volt

from

the

input

Rin

the

)

short

adjust

RANGE

5-4.

the

trans

resis-

input

V

the

dc

ser

With1volt

resistanceis10 in

Rin.

applied,

a.

Connect calibratortopositionAillustratedinFigure 5-5.

and

b. Set c.

the

Connect B showninFigure

ER

the

willbe0.91

ER

Model

voltmeter

MQ.

Set

RANGEto1 V.

voltmeter

varies

427A and

427A FUNCTION

calibrator

5-5.

voltifthe

directly

the

for

calibratortoposition

with

voltmeter

+1 V output.

hp

VOLTMETER

input

changes

to+DCV

427A

5-18.

AC

REJECTION

5-19.Apeakacsuperimposed

the

full

scale

ing

less usingavariable A

7.07 former The10volt dc

range.

01791-3

input

than

1%.

volt

correspondstoa 10

line

rms noise

should

Figure

transformer

output

signal

CHECK.

affect

5-4

from

willbeappliedtotheO.1

shows

the

volt

noise

signal

the

Model 427A

the

asanoise

variable

peak

noise

100

test

generator.

line

signal.

times

read-

setup

trans-

volt

VARIABLE

LINE

TRANSFORMER

CORD

ER 0

=ug

427A-B-0531

Figure

5-4.

----------/

AC

Rejection

~

o

@@

Check

5-3

Section V

TEST

OSCILLATOR

hp652A

Model 427A

hp427A

VOLTMETER

VOLTMETER CALIBRATOR

hp738BR

~r~~===0=~==OQ=@=_I

Figure

The

d.

5-23.

5-24. pFonthe on

the3through capacitance ies

with

reactanceofthe

100 kQ. At sistance

times

the

be

checked

played voltage put

capacitance

creases,

a.

A of

the

Model 427A FUNCTIONtoACV and RANGEto1

b. Set

c.

voltmeter indicatinganinput/resistanceof10 input

resistance

toleranceof±2%

INPUT CAPACITANCE CHECK.

The10MQ

0.01

through

check

the

meter

this

and shunt

input voltage.

by finding

dropsto0.707

decreases,

and

vice

Connect

input

capacitance

the

oscillator

just

the

Model 427A.

Connect crease

the

reading

input

resistanceisshunted with 40

1 voltacranges

300 voltacranges.

a 100 kQ

input. At a known

shunt

capacitance

point

the

capacitance

the

versa.

oscillator

amplitude

the

oscillatortoposition

frequency

should

may

vary

'shouldbeallowed.

resistorisplacedinser-

voltage

willbeequal

The

input

frequency

times

the

roll

and Model 427Atoposition

check

(Figure

frequencyto60Hzand

forafull

until

dropto0.91,

slightly,

and with20pF

For

this

frequency,

willbeequal

across

the

capacitance

at which

the

input.

off

frequency

5-5), and

scale

the

meter

INPUT

CAPACITANCE

__

INPUT RESISTANCE CHECK

5-5.

MQ.

The

and a

input

the

to

input

re-

toO.707

may

the

dis-

As

in-

set

ad-

display

B and

on

in-

display

Input

V.

-e-J......-0=<:l<A

Impedance

5-25.

5-26. cedures through through within adjustmentsisshown in

5-27. 5-28.

the

cover place

5-29. screws

np0811-0460

-><""

CHECK

:t<>---e-1

I

:

'-__

®

d.

Phillips

~

IMEG,O.I"Io

-<

hp0811-0473

Check drops

toO.707. The

should

be

is

nominally

from

variationof±10%isacceptable. Repeat

of

the

c

until should input above.

ADJUSTMENT PROCEDURES.

The

following

shouldbeused

the

5-24

its

specifications.

COVER REMOVAL. To

remove

about 1 inchtothe

the

cover,

To

removeaside

and

about40kHz.

specifiedat40pFand

instrumenttoinstrument.Afrequency

stepsathroughcusing

427A.Increase

the

reading

occur

capacitanceof20pFon 3 volt

performance

that

screws

liftitoff.

at about

AND

adjustment

only ifithas

the

Model 427Aisnot

Figures

the

toporbottom

securing

reverse

rear,

the

cover,

IOOK,O.I%

dropsto2. 1

checksinParagraphs

The

removal

Cf)@@-

~~_

1 ®

I

'----<J

VOLTMETER

--J

frequencyatthis

The

the

frequencyinstep

80

kHz.

CALIBRATION

and

locationofthe

5-6

the

cover,

and

liftitoff.

remove

.....

®

hp427A

f

input

capacitance

may

the

3 volt

volts.

This

calibration

been

determined

performing

and

6-2.

covers,

slide

procedure.

the

four

range

verifies

point

vary

range

This

pro-

5-5

internal

remove

the

To

re-

Phillips

and

5-4

01791-3

Model

427A

Section

V

A2C3 IOMV

IMC

ADJ

0,)oj=ooo~to~'o

O(;~~

33®@

00 00

00 00 00 00 000000

------NOTE----Before

suretoadjust

zero

accordingtothe

graph

3-6.

5-30.

AMPLIFIER ADJUSTMENT.

a.

Short TIONtoeither

b.

Set DC

c.

Remove COM A2R7 VOLTS and COM adjustment.

d.

Set

the

nco

fullytothe

cord

e.

Turn ZERO/nco indication.

f.

Repeat BAL is

the

------

If

the

rangeofadjustment

insufficient,

5-31.

REGULATOR ADJUST.

a.

Complete ment

A2RI7

IOMV

400CPS

ADJ ADJ

A2R7 A2R5

DC

OFFSET IV

i~o

~@~

A2

0 0 0

LEFT

SIDE

beginning

VOLTSand COM

ZERO/nco

shorting

terminals.

OFF

FUNCTIONto+DCVand

positionofindicator.

FUNCTIONto-DCV

steps

until

same.

(Paragraph

the

BALANCE

ADJ

fullytothe

the

refertoParagraph

Amplifier

calibration,

mechanical

stepsinPara-

AND

terminals;

+DCVor-DCV.

for

zero

connection

If

meter

for

zero

terminals

Repeat

steps

right.

d and e and

meter

NOTE------

Set

left.

indicationinboth

Balance

5-30).

DC

@ 0

00~J

A2R3

DC

Figure

5-6.

be

meter

ZERO

deflection.

from

VOLTSand

deflects,

deflection.

and

recheck

band

c if

turnDC

Range

to

and

rotate

Note

adjust

A1R15 AMP

A1R15

is

5-74.

and

Offset

A2R4

CAL

DC

.3V

'

g

0 0 0 0 0

00

.IV

CAL

LocationofInternal

OFFSET

set

FUNC-

adjust Short

zero

necessary.

ZERO/

O.

1.

Re-

DC

meter

steps

adjust-

CAL

AIRIS

OH~~t1oCAL

00

0~)0&

o

AIR20

O:7KCAL~AMP~BAL

0 0

~-;

~

3 @ @ @

o

o~

o o o

o~-

00

0(00

C3

3V

IOOKC

ADJ

Adjustments

b.

Short

VOLTStoCOM and OHMStoCOM. Set

FUNCTION

ed

within2minor

c.

Switch

FUNCTIONtoOHMS.Ifmeter

adjust

A1R5

This

may FUNCTION +DCV, and is

the

sameinboth

5-32.

AC CALIBRATION.

5-33.

Three theaccircuitsinthe justs

the 400 Hz input. MHz input Finally

tenuatorissetbyadjustingC3with

signal 5-34.

a.

b.

c.

5-35.

a.

adjustments

absolute

the

appliedtothe

LOW

Connect 5-1,

Set at to

Adjust volt adjustment Paragraph5-81 .

HIGH

Connect

amplitude

Then

to

calibrate

frequency

FREQUENCY

the

and

setSlto

the

voltmeter

0.01

volt

0.01

and FUNCTIONtoACV.

A2R17 400

indicationonthe

FREQUENCY

the

AI

000000000

RIGHT SIDE

to

+DCV.

divisions

REG

affect

ADJ

+DCV

back

and

adjust

A1R5

mustbemadetocalibrate

Model

427A.

A2C3

is

the

high

responseoftheACRange

input.

CALIBRATION.

Model 427Aasshown in Fib'Ure

position

calibrator

rms,

and

CPS

A2R17isinsufficient,

CALIBRATION.

Model 427Aasshown in

AIRI5 AIR5

0

O(}-;

'()O

33

00 00 00

00

00 00

Meter

shouldbezero-

upscale.

for

zero

setting,sorotate

forth

between

until

positions.

calibration

adjusted

427A.Ifthe

meter

First,

witha10

frequency

a 3 V 100 kHz

A.

outputto400 Hz

set

the

427A RANGE

ADJ

for

REGADJ

0

deflects,

deflection.

OHMS and

reading-

A2R17

with a 10 mV

exactly

mV 1

response.

range

refer

Figure

ad-

At-

0.01 of

to

5-1.

01791-2

5-5

Section V

b. Set

c. Adjust

Set

Sltoposition

0.01

and FUNCTIONtoACV.

the

output

the

oscillatorto400Hzand

for

exactlya0.01

427A.

the

Test

Oscillator

cation.

Record

B. Set 427A RANGE

set

level

for

set

asareferenceinstep

volt

control

(REF

a convenient

level

indication

d.

adjust

indication

SET) on

meter

for

to

the

on

indi-

use

scale

full respectively. are

calibrated

bration.

Use

inputs on

theO.1.O.3, and 1 volt

The

3 volt

by A2R5 and

the

test

through

requirenospecial

setupinFigure

a. Set FUNCTIONto+DCV and RANGE

Set

the

voltmeter

calibrator

volt.

0.1

b. Adjust A2R3

the

0-1

scale.

V DC CAL

Model 427A

1000 volt

5-3.

outputto+0.1

for

full

ranges ranges

cali-

to

O.

scale

l.

on

d. Adjust

adjust readjust

e.

volt

oscillator

the

indication

amplitude

establishedinstepc.DO NOT

the

Adjust A2C3 1MCADJ

indicationunthe rangeofadjustment refertoParagraph

f.

Rotate position

427A RANGE

A. foranoutput of 3 Vat400Hzand indication

on 427A

g. ChangeSlto

to

400 Hz. and

meter

indication

Adjust

h.

the

a convenient

i.

Increase and reference

j.

Adjust volt

5-36.

RESISTANCE INFINITY ADJUSTMENT.

5-37.

The amplifier ments. 5-31

balance.

Perform

before

oscillator

readjust

C3

indication

resistance

zero

the

making

established'in

3 V 100 kHz ADJ

the a. Set FUNCTIONtoOHMS b. Short

c.

5-38.

DC CALIBRATION.

5-39.

A dc voltage

dc

ranges.

OHMStoCOM

noo

for

zero

adjust

A1R18 X10 cation. mark

The

justtothe

Change RANGEtoX1K. and

adjustDCZERO/noofor

Open

the

CAL

input and

for

an00indication.

standardisneededtocalibrate

A2R3. A2R4. and A2R5

frequencyto1 MHz and

verniertothe

set

level

control.

for

exactlya0.01

Model 427

A2C3isinsufficient.

5-76.

switchto3.

Adjust

the

voltmeter

meter.

position

adjust

B. Set

amplitude

the

recordedinstep

set

level

control

(REF

reference.

frequencyto100 kHz.

oscillator

amplitudetoset

step

,I

h.

for

oil

the

427A.

calibrationisaffected by

offset.

and

regulator

stepsinParagraph

resistance

infinity

adjustment.

and RANGEtoX10.

and

adjust

indication. Open

OHMS

indicator

left

of

00.

CAL

should

short

theDCZERO/

the

for

restDnthe

OHMSto

zero

adjust

A1R20 X1K

are

adjusted

set

level

A.

If

the

setSlto

calibrator

record

oscillator

for

427A

f.

SET)

for

level

exactly

a 3

the

adjust-

5-30 and

input and

an00indi-

COM

indication.

OHMS

the

for

c.

Rotate

RANGEto0.3.

brator

outputto+0. 3 volt.

d. Adjust A2R4

0.3

scale.

e.

Rotate

RANGEto1 and change

outputto1 volt.

f. Adjust A2R5 1 V DC CAL

0-1

scale.

5-40.

5-41. used able.Ineach of mentisused.

the

accuracy. accurate

5-42. 5-43.

ALTERNATE AND

The

only if

the

specified

Model 427A

than

AC

CmCUITS.

Any

CALIBRATION

following

the

alternate

PERFORMANCE

alternate

equipmentinTable

procedure

accuracy.Ifa

the

calibrationortest

specifications.Toguaranteeaspecific

useastandardatleast

the

Model 427

test

oscillator

maybeusedasanacvoltage

tion

levelistoo

as

the

427Aisan

meter.

(The cussedinmore and

3-15.)

5-44. Monitor calibrated accurate frequencies. ence.

Each readjust ac

the

calibrationisbased ence.soalways ance

checksat400 Hz.

5-45. RESISTANCE

5-46.Ifa

tionofprecision

shouldbeat should

correspondtothe

part

numbers

given in

Table

high.

the

average

effectsofharmonic

detail

in Section

the

voltmeter

the

The

time

output

oscillator

Model 427A

rms

the

oscillator

for

the

start

theaccalibrationorperform-

rms

as

CmCUITs.

decade

resistorisnot

resistors

least1%resistors

for

1%

resistors

5-3.

voltmeter

on a 400Hzabsolute

RANGE

and change

V DC CAL

for

the

for

full

PROCEDURES.

procedures

5-1isnot

useaninstrument

less

accurate may

four

A.

with low

distortion

standard.Ifthe

calibration

responding

maybewrong.

rms

distortion

ill,

Paragraphs

output with a

knowntobe

over

the

four

same

servesasa

frequencyischanged.

reference.

The

available.aselec-

maybeused.

and

the

The

values

settings.

for

each

the

cali-

3 on

the

0-3

calibrator

scaleonthe

CHECKS

should be

avail-

instru-

not be within

times

more

«2%)

distor-

calibrated

are

dis-

3-14

recently

times

as

band of

refer-

Model427A

refer-

resistors

selected

The

-hp-

range

are

5-6

01791-3

Model 427A

Table

RESISTOR

(±1%)

1051

10051

1kn

10kn

100kn

1Mn

10Mn

5-47.

DC

CmCUITS.

5-48.Aprecision

dc

calibration 427Aisonly volt

ranges,

5-49.Amercury Connecta

across

the

and

performance calibratedonthe only

three battery

series

voltage

battery

and calibrateddcvoltmeter ateasthe

theO.1,

5-50. 5-51.

oscillator M

ohms

meter

to-peak

jection 5-52. 5-53.

COM

Switchat+DCVor Another

If

an measure and

FUNCTION

5-54.

5-55. tery counterclockwise, rearofthe withanEveready

Model 427A.

0.3,

and 1

volt

AC

REJECTION.

To

check

AC

with output of10volt

maybeused.Ifthe

Calibratorisavailable

output

may

alsobeusedtocheck

of Model 427A. INPUT IMPEDANCE CHECK. Measure

terminals

the

resistance

directly

-DCV

Model 427A couldbeused

L-C

meter

COM

the terminals

input

or

capacitance

directly.

switchisin

BATTERY

Figure

connections.

REPLACEMENT.

5-7

shows

Turn

tilt

instrument,

763orRCAVS102, 22

5-3.

1%

Resistors

-hp-

dc

voltage

sourceisrequired

checks.

1 volt,

different

has

divider

monitor

voltages

good

withavariable

the

output

knowntobe

Use

this

ranges.

Rejectionon0.1

peak-to-peak

-hpa 400 Hz10volt

between

with

the

Model 427A

usinganaccurate

capacitance

bridgeisavailable,

between

Be

sure

ACV

position.

battery

twist-lock

and

lift

out.

the

battery

and

PART NO.

0757-0984 0757-0198 0757-0159 0757-0839 0757-0367 0698-3583 0698-3592

Since

0.3

volt

and

are

needed.

short

term

stability.

output

witharecently

four

timesasaccur-

outputtocalibrate

volt

range

into

Model 738BR

Volt-

peak-

theACRe-

the

VOLTS and

Function

ohmmeter.

for

this

purpose.

the

holder

fastener

holder

Replace

1/2

VOLTS

Model 427A

and

the

bat-

1/4

toward

the

battery

volt

dry

the

0.1

turn

the

cell

for

an 10

5-56.

5-57.

adjust

Paragraph

proceed 5-58.

trouble,

connectors. cracks

and

5-59. the of shooting

TROUBLESHOOTING.

When

the

and

Model

calibrateitaccordingtothe

5-25.Ifcalibrationisimpossible,

with

the

troubleshooting

Check

the

instrument

suchaslooseorbroken

Check

and

pins

separations,

are

Isolate

clean

the

troubletoa

troubleshooting

Operation

(Section IV).

steps

for

that

and

table

graphs.

Table

5-4.

SYMPTOM

Battery

ok, no

re-

sponsetoinput.

All

+DCV

ranges

pegged with no input. ACV and OHMS ok.

Nonlinear voltage

Constant tiononlower ranges;

tracking

ranges.

upscale

deflec-

+DCV

voltageatTP1

low. Meter

pegs

range

near

on +DCV

ranges.

always

zero,

DCV

and

OHMS reads

OHMS

and ACV ok.

OHMS

always

reads

DCV and ACV ok.

Intermittent

operation.

Zero-offsetinACV FUNCTION

greater

2%. Meter

pegs

full

on

anyACrange.

scale

427Aoperates

steps.

for

the

printed and

circuit

ensure

tight.

particular

(Table

5-4) and

Then

refertothe

circuitinthe

Troubleshooting

PROBABLE TROUBLE

Power Paragraph

offset

DC A2CR1. A1Q6.

on

Amplifier.

DC A1Q8 and circuit. of

range

Check

A1R14 and A1Q9.

DC Amplifier..

Paragraph

DC

Amplifier;

A1Q6, A1Q8, and A1Q9.

(See

Paragraph

Range

resistor Figure Check R19

R25 on S1.

Range

resistors Figure Check R12

on S1.

Check

00.

Either through or

one ofR12

open. Power

supply,

Q4 (See

Metering

AC

than

(See

Paragraph

AC

Metering

check

A2CR3andA2CR4

Paragraph

(See

Section V

improperly,

procedures

obvious

evidence

wiresorbroken

boards

that

all

connectors

circuit

the

Theory

Trouble-

following

AREA

Supply. (See

5-60.

)

circuit.

Then

Check

check

Check

associated

Check

value

resistors.

(See

5-63.

)

check

5-65.)

(~a

in

4-3) open.

through

(Rb

4-3)

shorted.

through

Power

R18

Supply.

oneofR19

R25 (Ra)

shorted

through

check

Paragraph

5-60.

Circuit

5-67.

Circuit,

5-67.)

first

in

then

of

for

using

para-

in

R18

A1-

)

01791-3

Figure

5-7.

Battery

Replacement

5-7

Section V

5-60.

POWER SUPPLY.

5-67.

AC

METERING CIRCUIT.

Model 427A

at

A1

5-61. Check

pin 9

for A1Q4 A1Q4

-6.4to-7

first.Ifthe

maybebad. Minimum

pin 7

volts.Ifthereisno

power

volts.

5-62.

Measure

given in

Table

referencetocircuit

thedcvoltagesatthe

5-5.

All

ground.

Table

5-5.

The

voltages

are

nominal. A

±10%

shouldbeallowed

for

minimum

Power

CHECK POINT

Emitter Collector Base Emitter Collector

Emitter

Collector

Collector Base Across

A1Q1

A1Q1 +14.8V (7.8Vmin)

A1Q2

A1Q3

A1Q3 A1Q4

A1Q5

A1CR2

5-63. DC AMPLIFIER. 5-64.

To

fier,

switchto+DCV.

and

8. Since the readingiscorrect, proper

ing 5-65.

and

the the

open.Ifthe

makeanoperatio.nal

set

the

RANGE

switcbto1 and

Connect·a 1

COM

terminals

and

theDCAmplifierisa unity

voltage shouldbe+1. 07

theDCAmplifierisoperating

ly.Ifitisincorrect,

troubleshooting

Checkatthe

check

for

collector

procedures.

collector

+3.0

VdcatA1TP1.Ifthe

of A1Q9isquite

voltageatA1TP1is+3.0

collector

point voltageiscorrect,

If

both

voltages

are

incorrect,

bad.

5-66.Ifthe

the

voltageatA1

A1Q6isprobably

collector

TP1isslightly

bad.

-----NOTE------

If

A1Q6isreplaced

remains

and

peggedorindicates

cannot be valueoJfactory A1R19. See

Paragraph

for

+6.4to+7

volts

output,

supply

has

been

battery

measurements

Supply

overloaded,

voltageis15.5

check

points

are

made

Voltages

NOTE

listedinthis

tolerance

table of

except

voltages

listed.

VOLTAGE

+15V (+8V min) +7.3V

+6.7V

+15V (8.

(+6. 4V min)

6V

min)

-0.5V

-0.2V

-6.7V

(..6..4V min) +0.5V +6.2V

check

oftheDC

the

volt

monitor

±O.

sourcetothe

the 07

proceed

of A1Q9

FUNCTION

VOLTS

voltageatA1

gain

volts

amplifier,

dc.Ifthis

with

the

for

+3. 5 Vdc,

voltage

high(6or

7 volts)

Vdc, A1Q9isprobably

voltageislow and

A1Q8isprobably

the

shorted.

A1Q7orA1Q8isprobably

voltage on A1Q9iscorrect

higher

than

normal,

and

the

meter

upscale

adjusted,

selected

check

the

component

5-71 and

5-73.

and

check

with

Ampli-

follow-

at

and

test

and

A1

5-68.

To

check

the

RANGEto0.01

10

mV

a and

rms

monitor

the

sourcetothe

AC

and

the

FUNCTIONtoACV. Connect

signalatA2 pin 0 shouldbe10.7mVrms sured

signalisincorrect,

DC

AmplifierortheACPost

5-69.

Monitor

The

signal measured is

functioning

following 5-70. Check

If

a given

in

that

componentorits

or

A2CR4 FUNCTION selected

Table

the

should be

signalatthe

0.28Vrms

signaliscorrect,

proper

ly.Ifnot,

troubleshooting

fordcvoltage

readingiswrong,

are

replaced

is

greater

and

than

component A2R14*. See

5-6.

AC

Metering

NOTE

The

voltages

are

nominal. A

listedinthis

shouldbeallowed.

CHECK POINT

A2TP1

Collector

A2Q1

Emitter

A2Q2 A2Q3

Collector

5-71.

ADJUSTMENT

COMPONENTS.

5-72.

Certain individually slightly nents

are

and

the

optimumoraverage following factory their need

selected

selection.

tobechanged nentischanged. transistor factory

5-73. 5-74.

sistor justed R19* to

selected

A1R19*.

A1R19* A1R15.Ifthe properly

may

select

a. Set RANGE

components

selectedinordertocompensate

varying

circuit

parameters.

denoted byanasterisk

paragraphs

describe

component

Normally

unless

For

require

example,

the

may

component.

adjusts

the

AMP BAL A1R15 cannot be

after

replacing

needtobe changed.

A1R19*.

toO.3.

b. Set DC ZERO/nco

to

its

A1R15

center.

Metering

VOLTS and

the

Circuit,

pinO.The

±O.

7 mY.Ifthe

troubleisin

COMterminals

signalatA2

Attenuator.

collector

of A2Q3.

±O.04V.

the

AC

Metering

proceed

with

procedures.

levels

listedinTable

the

associated

troubleisprobably

circuit.IfA2CR3

the

zero

2%,

check

the

Paragraph

Circuit

offset

value of

Voltages

in ACV

5-72

table

toleranceof±10%

VOLTAGE

+2.8

V

+2.8

V

+.2.2 V

-0.5

V

OF

FACTORY

within

(*)onthe

the

Model 427A

These

SELECTED

compo-

schematic,

valueisshown.

the

function of

and

give

these

another

instructions

components

associated

replacement

changing ofanassociated

rangeofthe

transistor

Use

AMP BAL

the

following

A1Q6, A1-

adjustmenttocenter

set

mea-

either

If

the

Circuit

the

factory

and

for

The

each

for

do not

compo-

of a

re-

ad-

steps

and

the

5-6.

5-77.

are

5-8.

01791-3

Model 427A

c.

Select

the

will

d.

If

the the crease is0to

5-75.

A2C2*.

5-76.

A2C2* calibration high

capacitor

frequency notbeadjusted A2C2* should high, change ingisconsistently

FUNCTION (+DCVor-DCV) which

produceanupscale

FUNCTION

value

of A1R19*;if+DCVisselected,

A1R19*. The

deflection.

selectedis-DCV,

value

range

1850Q.

adjusts

the

rangeofthe

A2C3 1MCADJ.Ifduring

calibration

for

be

changed.Ifthe

the

value of A2C2*to47

low,

the

(Paragraph

proper

remove

reading,

readingisconsistently

A2C2*.

high 5-35) A2C3

the

pF.Ifthe

5-77. A2R14*. 5-78. A2R14*

meter

tracking

factory

and

selectedtoimprove

correct

any

non-linearityofdiodes

is

A2CR3 and A2CR4.Ifdiode A2CR3orA2CR4 placed, cedure

A2R14*

may

outlined in

needtobe

the

following

changed.

Use

paragraphtoselect

A2R14*.

increase

de-

of A1R19*

frequency

the

can-

value

of

read-

upscale are

re-

the

pro-

5-82.

ETCHED

CIRCUIT

5-83. The Model 427A sided

the

ing

etched circuit rules

a.

board

when

Wear

circuit

and

soldering:

clean, when handling touching

the

fingersasskin

b. Use a

c.

low-heat

soldering

core To

(long tweezers to soldering and obviously

iron,

solder.

remove

nose

pliers,

etc.

the

componentaspossible.

iron

pull

up on

damagedorfaulty, closetothe the

leads

from

BOARD

uses

plated-through

boards.

components,

lint

free

cottonorrubber

the

circuit

To

REPAIR.

prevent observe

boards.

boardorcomponents

oils

can

cause

leakage

(25to50

and a

a component,

watts)

small

clipaheat

diameter

commercial

) on

the

component

directlyonthe

the

lead.

components

the

board.

component

If

a component

and

then

Section V

double-

damage

the

follow-

gloves

Avoid

with

bare

paths.

small-tip

rosin

sink

heat

sink

leadasclose

Place

the

clip

the

leads

remove

to

lead

is

5-79.Ifa

zero-offset divisionsonthe replace The resistance Tracking

A2R14* with a

correct

that

error tionisreduced A2R14*is91 recommended a 47 ohm Part

5-80. 5-81.

Calibration

Metering

CPS during A2R16*

(-hp-

No. 0683-6805)

A2R16*. A2R16*

Resistor

Circuitisfunctioning

ADJ

cannotbeadjusted

low

frequency

may

consistently

Part

No. 0757-0395).

0-1

value

for

adjusts

could

below

ohms

(-hp-

replacement

Part

adjusts

greater

scale)

smaller

A2R14*isthe

the

resultifthe

1%.

No. 0683-4705)or68

1/4W,5%

the

A2R17 400

than2%(two

existsinACV FUNCTION

valueofresistance.

largest

zero-offsetto

zero-offset

The

Part

nominal

No. 0683-9105).

value

for

A2R14*iseither

resistor.

rangeofthe

CPS

ADJ.Ifthe

properly

for

the

needtobe changed.

calibration

proper

(Paragraph

If

the

low, change A2R16*to56.2

less

value

ohm

low

and

reading

ohms

minor

value

than

indica-

for

The

(-hp-

frequency

AC

the

400

indication,

5-34),

(-hp-

of 2%.

is

EXCESSIVE OR PROLONGED HEAT CAN

LIFT THE BOARD TO

Clean

d.

solderinthe

dering

metallic

e.

To and on iron, a good

f. Clip

excess area,

mount a new component,

insert

the

excess

THE CIRCUIT FOIL FROM

OR

CAUSE

COMPONENTS.

the

component

lead

hole, quickly

iron,

and

object

inserting

suchasa toothpick.

theminthe

component,

and add

electrical

leads

flux

from

using

typeTFFreon

heat

solderasnecessarytoobtain

connection. off

after

the

connection and adjoining

holes.

8500-0232).

DAMAGE

holesbyheatingthe

removing

the

sol-

a pointed, non-

shape

the

Clip a

with

the

soldering

(-hp-

leads

heat

sink

soldering

and

clean

Part

No.

01791-2

5-9

Model

427A

Hewlett-Packard

Voltmeter

Serial

No.

l.

AC

ACCURACY CHECK:

2.

FREQUENCY RESPONSE CHECK:

3.

RESISTANCE ACCURACY CHECK.

4.

DC

ACCURACY CHECK:

5.

AC

REJECTION

6.

INPUT

7.

INPUT

Model

427A

DESCRIPTION

CHECK: 100

RESISTANCE CHECK:

CAPACITANCE CHECK: 40

PERFORMANCE

CHECK

TEST

Tests

±2%offull

<

1%

10

MQ

pF

20

pF

CARD

performed

times

change

all

by

Date

CHECK scale

±2%

10 Hzto1 MHz

10 Hz

100 Hz

1 kHz

10 kHz 100 kHz 500 kHz

1 MHz

±5%ofreadingatmidscale

Range

X10 X100 X1K X10K X100K X1M X10M

scale

full

scale

input,

ranges

.01

- 1

volt

Range

3 - 300

volt

Range

I I

Reading

I I

I

I I

I

I I

I

I I

I

Model 427A

Section

VI

6-1.

INTRODUCTION.

6-2.

This

the

section

Model 427A

shows

the

switches.

Wire Color; Color code same

color code. First number indicates color, second number third number indicates E.g.

layoutofboth The

Connector

Chauisoranother

~

denotes

contains

and

the

switches

PARTIAL ASSEMBLY COMPLETE

ASSEMBLY

A2

NONE

XA2

mounted on J I

Number indicates pin

connector

indentifi~s

WHT·RED·YEL

SECTION

CIRCUIT

DIAGRAMS

with

VI

the

strumentisat

the

A2

circuit

the are

schematic

diagrams.

FUNCTION

viewed

REFERENCE

OR

DESIGNATION.

diagram

Figure

and

from

the

REFERENCE

SUBASSEMBLY

NONE

A1

NONE

Auembly Reference

Designation Name (i,/cludes

~

I

A21

of

6-1

RANGE

bottom

DESIGNATIONS

r,

----"-----

POWER

~';~M;L;~~;'ll

6-3.Figure

boards

ure

DESIGNATIONS

DESIGNATION(S)

COMPONENT

Auembly Auembly

6-3isthe

ARE

......

AUemblY~

XA2

~

2 1

: I / connector

I I QI

of

XA2

~

~-=~~4

as

resistor I \ I

wider strip, I I

",,"ower

strip. Eyelet wire.

: I 6

I

---.i:(3~-+---

I

k>----+-----.--

base

I

mayor

~Subauembly

AI

--~----

[PHOTO-CHOPPER OSCILLATORI

or

standoff terminal I

may not be numbered

of

switches

and

Q1 R1

J1

A2

----..

6-2

the

SHOWN:

Part

A2AI

flattened

the

bottomofthe

shows

bottom

schematic

PREFIX

OR

BOTH

Number

subassembly)

I

~)~

l.

Male standoff pin connector

out.

the

layoutofthe

view of

diagramofthe

WITH

FOR

COMPLETE

DESIGNATION

A2Q1

A2A1R1

J1

Il

I

m

XA2?

1

I

Pin may or may not

~

! I

~

I on a

The

frontofthe

page.

the

instrument.

II

I

~

'

Destinationofwire

(Auembly

XA3-4

be numbered

Female pin connector

two

circuit

Fig-

Model 427A.

not mounted on Auembly

A2

XA

3

A3),

Pin 4

WHT·RED

wire

STD-A-1I00A

in-

01791-2

6-1

4

2

7

9

8

RED

YELLOW

ORANGE 3

8

VIOLET

WHITE

GREEN 5

GRAY

BLUE

12

II

00.0

10

WIRE COLOR

NOTES

CODE. (e. g. 918 a

USING STANDARD COLOR

~DENOTES

BROWN, GRAY)

0

CODE

COLOR

BLACK

WIRE

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Component

OPTION01ONLY

Location

SCHEMATIC

1.

PARTIAL WITH ASSEMBLY OR SUBASSEMBLY DESIGNATION(S) OR BOTH FOR

2. COMPONENT VALUES ARE SHOWN WISE NOTED.

3. CONNECTED TO

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- - - - - - -

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REFERENCE

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BY

HEWLETT-PACKARD

COMPANY

01791-2

Figure

6-3.

Schematic

Diagram

6-3

Section

VII

427A-

Model 427A

MP2

~I

MP3

MP4

RO

MP8

MP7 MP6

MP5

427A-B

-0540A

MPII MPI3

MPI4

MPI5

7-0

Figure

7-1.

LocationofMechanical

Parts

01791-1

Model 427A

Section

vn

7-1.

INTRODUCTION.

7

-2.

This replacement meric

orderoftheir

cates

the

together

with any

following:

a.

Total column).

Descriptionofthe

b.

tions

c.

Typical digit

facturers.

Manufacturer's

d.

A B = BT C = CR DL OS E =

Ag Al A Au

C = cer coef = COm comp COnn

dep DPDT

DPST =

elect=electrolytic encap

F = FET fxd = fixed

GaAs = GHz

gd Ge grd

H = Hg Hz

section

parts.

contains

Table

reference

description,

-hp-

applicable

quantity

usedinthe

below.)

manufacturerofthe

code. (See Appendix A

)

part

assembly

=

motor

battery

=

capacitor

= diode

line

= delay =

lamp misc

electronic

part

silver

=

aluminum

=

ampere

(s)

= = gold

capacitor

=

ceramic coefficient

=

common

=

composition

= connection

deposited

=

double-pole

=

double-pole

='encapsulated

farad

= field

gallium

=

gigahertz

=

guard

=

germanium

= ground (ed)

henry mercury

= =

hertz

throw throw

second)

(s)

effect

arsenide

= 10+9hertz

(ed)

(ies)

(cycle (s)

doublesingle-

transistor

per

information

7-1lists

designators

part

numberofeach

notes,

and

instrument

part.

(See

number.

F

=

FL

=

HR

=

IC =

J =

K =

L = M =

ill

=

impg

=

incd =

=

ins

= kilohm (s) = 10+3ohms

kl1

=

kHz L =

lin=linear log=logarithmic

= =

rnA

MHz=megahertz

= megohm.-(s) =

Mil metam= mfr=manufacturer

mtg

= mounting

mV =

=

Il

=

IlV

my

= =

nA

NC

= Ne = neon NO=normally

= negative

NPO

Dupont de

®

SECTION

REPLACEABLE

for

partsinalpha-

for

Iuse

filter

heater integrated jack

relay

inductor meter

inside impregnated incandescent insulation

kilohertz inductor

milli milliampere

metal

millivolt micro microvolt

Mylar nanoampere

normally

ordering

and

indi-

part,

provides

the

(TQ)

listofabbrevia-

part

in a

five-

listofmanu-

circuit

ABBREVIATIONS

diameter

(ed)

= 10+3hertz

taper

3

=

amperes

film

=

amperes

(zero eUicient)

Nemours

10-

(s) =10volts

10-6-6

®

closed open

positive

temperature

(s) =

= 10

10+

(s) = 10

(s) =

3

10-

+6

hertz

6

ohms

-3

volts

9

10-

zero

co-

DESIGNATORS

VII

PARTS

7

-3.

Miscellaneous

Table

7-1.

to

paragraph

value.

7-4.

ORDERING

7-5.

To inquirytoyour (See Appendix

partsbytheir

7-6.

7-7.

MP = P = plug

Q =

QCR R = RT =

S

T =

11

obd = 00

p pc

pF

piv

plo =

pos=position poly pot p-p ppm = prec

R =

Rh

rms=root-mean-square rot

=

Se = sect

=

Si =

obtain

NON-LISTED

To

obtainapart

a.

Instrument

b.

Instrument

c.

Descriptionofthe

d.

Function

mechanical transistor

transistor-diode

=

resistor thermistor switch

=

transformer

= nanosecond (s) = = not

= ohm (s)

orderbydescription

=

outside

=

peak printed

= =

picofarad

=

peak part

polystyrene

= =

potentiometer

=

peak-to-peak parts

=

precision

resistor

=

rhodium rotary selenium

section silicon

part

seconds

separately

able

diameter

circuit

(s) =

farads

inverse

voltage

of vacw

(s)

per

million

(temperature coefficient, long stability,

and!ortol-

erance)

(s)

Each

factory

describing

parts

INFORMATION.

replacement

local

B

Hewlett-Packard

for

list

Hewlett-Packard

PARTS.

thatisnot

model serial

and

locationofthe

TC V = vacuum tube, neon

W =

X

XDS

XF

Z =

9

10-

sl

12

term

SPOT = SPST =

Ta TC = Ti0

2

tog

tol trim TSTR=transistor

V

var vdcw =

W =

wi wiv = working

wlo

ww

replace-

10-

are

listedatthe

selected

the

selectionofthe

parts,

of office

locations.)

part

listed,

number. number.

part.

thermocouple

=

bulb,

photocell,

cable

=

socket

=

lampholder

= fuse

holder

network

=

slide single

-pole

throw

single-pole

throw

=

tantalum temperature

= titanium dioxide = toggle

tolerance

= =

trimmer

=

volt

(s)

alternating

=

working

voltage

=

variable

direct

current

voltage

watt

(s)

= with

inverse = without = wirewound

= optimum value

at

factory, value shown be omitted)

= no

standard

ber

assigned

Or

special

componentiskeyed

end of

component

address

Field

order

Office.

or

Identify

numbers.

include:

part.

etc.

doublesingle-

coefficient

current

working

voltage

selected

average

(part

may

type

num-

(selected

type)

01791-2

7-1

Section

vn

REFERE DESIG ATOR

A1

A1C1 A1C2, A1C3 A1C4 A1C5 A1C6

A1CR1 A1CR2 A1CR3

A1CR5

A1Q1 A1Q2

A1Q3

A1Q4 A1Q5

A1Q6 A1Q7 A1Q8 A1Q9

A1R1 A1R2 A1R3 A1R4 A1R5

A1R6, A1R7 A1R8 A1R9 A1R10

A1R11 A1R12 A1R13 A1R14 A1R15

A1R16 A1R17 A1R18 A1R19*

A1R20 A1R21 A1R22

A2

A2C1 A2C2*

A2C3

A2C4 A2C5 A2C6

thru

CEo

-hp-

PART

O.

00427-66501

0160-0170 0160-0168 0150-0093 0180-0224 0180-1800

1901-0025 1902-0568 1910-0022

1850-0111 1854-0087 1854-0033 1850-0111 1854-0033

1855-0023 1854-0057

1853-0036

1854-0057

0757-0198 0684-5611 0684-1541 0757-0444

2100-1735

0698-4972

0757-0453 0757-0454 0698-4199

0757-043'9 0757-0440 0684-3321

2100-0394 0698-4205

0698-4207 2100-0328 0757-0408

2100-0205 0698-4202 0684-3911

00427-66502

0180-0039

0160-0356 0130-0017

0180-0060 0180-0033 0180-0039

TQ

Table

1 2 1 1 1

1

5

2

1

2

1

4

2

1 1 1 1

1

2

1 1 1

1 2 1 1

1

2 1

2

1 1

1

3

1

7-1

Replaceable

Assembly:

C1

thru

CR1

thru

C: fxd

cer

C: fxd

0.1

C:

fxd

0.01 C: fxd Al C: fxdAIelect

Diode:

Si 100 rnAat+lV

Diode:

breakdown

Diode:

Ge HD1872

TSTR:GePNP TSTR:SiNPN TSTR:

Si P 2N3391 TSTR: Ge TSTR:SiNPN

TSTR:

FET TSTR:

Si 2N3855A

TSTR:SiPNP

TSTR:

Si 2N3855A

R: fxd

prec

R: fxd

comp

R: fxd

comp

R: fxd

prec

R:

varww5

R: fxd

prec

R: fxd

prec

R: fxd

prec

R: fxd

prec

Not

assigned

R: fxd

prec

R: fxd

prec

R: fxd

comp

R:

varww300

R: fxd

prec

R: fxd

prec

R:

varww500

R: fxd

prec

(See

Paragraph

R:

varww5000

R: fxd

prec

R: fxd

comp

Assembly:

C: fxd C: fxd

C: C: fxd C: fxd C: fxd

boardACMetering

C1

thru

CR1

thru

elect mica18pF

(See

Paragraph

var

cer elect elect50J.1.F elect

Parts

DESCRIPTION

boardDCAmplifier

C6

Q1

CR5 R1

0.22

J.1.F

elect

+80% -20% 25 vdcw

±10%

200 vdcw

J.1.F

+80% -20% 100 vdcw

10

J.1.F

+75% -10% 15 vdcw

100

J.1.F

+100% -10% 6 vdcw

6.2V±5%

2 404A

2N3417

PNP

2N404A

2N3391

SU527

2 3906

met

flm

100

560

ohms

±10%

150K ±10%

met

flm

12. 1K

ohms

±10%

met

flm

3300

met met

met

flm flm flm

flm

ohms

flm flm

ohms

flm

499K

30. 1K

33. 2K 2800

6810 7500

ohms

±20%

21K

44. 2K ±10%

250

met met met

met met

5-73)

ohms

flm

ohms

±10%

8870

±10%

Q1

met

390

C9

CR4 R1

100

J.1.F

12 vdcw

±5%

5-75)

8-50

pF

200

J.1.F

+100% -10% 3 vdcw

+100% -10% 6 vdcw

100

J.1.F

12 vdcw

(Cont'd)

thru

100 piv 12

ohms

±1%

1/4

W

±1%

1-1/2

W

±1%

ohms

ohms ohms

±10%

1/4

1-1/2

±1%

1/8

±1%

1-1/2

ohms

1-1/2

ohms

1/4

Circuit

thru

Q3

thru

R17

300 vdcw

includes Q9 R21

pF

1/2

W

1/8

W

1/2

W

1/8

W

1/8

W

±1%

±1% ±1%

W

1/8

W

±1%

1/8

W

±1%

W

includes

1/4

1/8 1/8

W

1/8

Model 427 A

MFR.

PART

MFR.

O.

-hp-

56289 56289 91418

56289 56289

5C9A obd 192P10492 TA

obd 30D106G015BA4 Non-polar

30D

type

obd

-hp-

75042 75042 71450 75042

-hp75042 01121

DZ50801U

obd

2N404A 2N3417 2 3391 2N404A 2N3391

SU527 2N3855A

obd

2N3855A CEC

T-O CB5611 CB1541 CEA

T-O 110

CEC

T-O CEC

T-O

CEA

T-O MF6C

T-O

CEA

T-O

CEA

T-O

CB3321 110

CEA

T-O

CEA

T-O 110 CEA

T-O

CEA

T-O

CB3911

obd

obd obd

obd obd obd obd

obd obd

obd obd obd

obd

12954

03877

01295 24446 24446 01295 24446

17856 24446 07263 24446

75042

W

01121 01121 75042

11236 75042

75042 75042 19701

W

75042

W

75042

W

01121 71450

W

-hp-

56289 04062

72982

56289 56289 56289

30D107G012DC4M1

obd

557-019-U2PO-34R 30D207G003DC4 30D506G006CB4M1 30D107G012DC4M1

7-2

01791-3

Model 427A

REFERE DESIG ATOR

A2C7, A2C8 A2C9

A2CR1 A2CR2 A2CR3,

A2CR4

A2Q1, A2Q2 A2Q3

A2R1 A2R2 A2R3 A2R4 A2R5

A2R6 A2R7 A2R8 A2R9 A2R10

A2R11

A2R12

A2R13

A2R14*

A2R15

A2R16*

A2R17

B1

C1,

C2 C3 C4

C5 J1 J2

M1 R1

R2 R3 R4

R5 R6

R7 R8 R9 RIO

R11 R12 R13 R14 R15

R16 R17 R18

CE

-hp-

PART

0180-0064 0180-0039

1902-0571 1910-0022

1854-0057 1853-0023

0757-0283 0698-4202 2100-0328

2100-0291 2100-0205

0757-0449

2100-0094 0757-0465 0·698-4207 0757-0461

0757-0419 0684-2731

0757-0437

0683-9105

0757-0440

0698-4386

2100-3,212

1420-0030

0170-0022

0132-0003

0140-0152

0170-0022

1120-0903 0684-1031

0698-4217 0730-0113 0698-4214 0698-4212

0698-4209 0698-4206 0698-4203 0684-1051 0698-4128

0698-4129 0698-4219 0698-4189 0698-4191 0698-4198

0698-4204 0698-4210 0757-0872

Section

VII

Table

7-1.

Replaceable

O.

TQ

2

1

1 R: 1 R:

1 R:

1 R: 1 1 R: 1 R: 1 R:

1 1 R: 1 R: 1

1

1 R: 1 3

1 1

fxd

elect

C:

fxd

elect

C: Diode:

zener

ot

assigned

Ge HD1872

Diode:

Si 2N3855A

TSTR:

Si

TSTR:

fxd

prec

fxd

prec

varww500

R:

varww1500 var

precww5000

R:

fxd

prec

var

pot

R'

fxd

prec

fxd

prec

fxd

prec

fxd

prec

R'

fxd

comp

fxd

prec

R: fxd

comp91ohms

(See

Paragraph

R: fxd

prec

R: fxd

prec

(See

Paragraph

var

200 Battery: C: fxd my

C: C: fxd

var

trimmer

mica

22-1/2Vdry

C: fxdmyO.

NPN

Parts

DESCRIPTION

35

/IF

+100% -10% 6 vdcw

100 /lF12vdcw

14 V

2N3703

met

flm flm

ohms

2000 8870

±10%

met

ohms

met

flm

27K

lin flm flm flm

flm

±10%

flm

20K

50K ±30%

lOOK

44. 2K

68. 1K 681 4750

comp

met met

met met met

±5%

5-77)

met

flm

7500

met

flm

59.0

5-80)

ohms

±10%

0.1

/IF

±20% 600 vdcw

0.7to3

1000pF±5%

1

/IF

±20%

(Cont'd)

ohms ohms

1-1/2

±20%

±1%

ohms

1/4

ohms

1/4 ohms ohms

Type cell

pF

300 vdcw

600 vdcw

1-1/2

±10%

1/8

±1% ±1%

W

HI

±1% ±1%

1/10

1/8

1/8 1/8

±1%

W

±1% ±1%

W

1-1/2

W

W W

1/8

1/8 1/8

1/8

1/8 1/8

W

W W

MFR.

56289 56289

04713 03877

24446

30D356G006BB4

30D107G012DC4M1 SZ10939-224

obd

2 3855A

01295 obd

75042 75042 71450 71450

CEA

110

-hp-

75042 71450 75042 75042 75042

75042 01121

75042

01121

75042 75042

73138 83740

84411 72982 04062

OOOLH

CEA

UPE

CEA

CEA CEA

CEA

CB2731 CEA CB9105

CEA CEA

72PR200

No. 763 obd HEW-27

535-016-4R DM16F102J HEW-17

MFR.

PART

T-O T-O

T-O 70RE T-O T-O T-O

T-O T-O

hp-

NO.

obd obd obd obd

obd

obd obd obd obd

obd

obd obd

obd

See Option 01 See

MP16

and MP18

2 W 1 W W W

W W

1 W 1/4W 1/4W

W

-hp01121

CB1031 91637 DC2 91637 DC1 75042 75042

75042

75042 01121 03888

75042

91637 DC1

19701

19701 01738

CEB CEB

CEB

CEB CEB

CB1051

PME CEB MF6C

MF5C MF6C

MF6C MF6C

MFF-l/2-10,

T-.O T-O

T-O T-O T-O

70

T-3

T-O T-O T-O

T-O T-O

T-1

obd obd obd obd

obd obd obd

obd

1 1 R:

1 R: 1 1 R: 1 R:

1 R: 1 R: 1 R: 1 R: 1 R:

1 1 R: 1 1 R: 1 R:

1 1 R: 1

Meter:

fxd fxd fxd

R:

fxd fxd

fxd fxd fxd fxd fxd

fxd

R:

fxd

R'

fxd

R: R:

100/lA

comp prec prec

prec prec

prec prec prec comp1meg prec

prec prec

fxd

prec prec

fxd

prec

fxd

prec

fxd

prec

fxd

prec

10K carbon carbon met

flm

met

flm

met

flm

met

flm

met

flm

met

flm10meg

met carbon met

flm met met

met met met

±10%

flm

flm flm

flm flm flm

1/4

flm

6.837

flm

2. 163

683. 7K

216. 3K

68. 37K

21. 63K 10K

±10%

31. 723K

flm

11.74

10.15

101. 5 1174

11. 75K

118. 8K

1.30

W

meg

me~

±O.

5 0

±O.5%1/4 ±O.5%1/4

±O.5%1/4 ±O.5%1/4 1/4

W

±D.

25%

±O.1%1/4

meg ohms ohms

ohms

±1%

±1% ±1%

meg

±1%

±1% ±1%

1/4 1/4

±1% ±1%

1/4

W

1/2

±1%

1/4

W W

1/2W

01791-3

7-3

Section

REF DESIG

R19 R20 R21, R22 R23

R24 R25 R26 R27 R28

R29 R30 R31 R32 R33

R34 R35, R36 R37

Sl S2

VII

ERE

CE

ATOR

-hp-

PART

O.

0698-4220 0698-4194

0698-4208

0698-4213 0730-0131 0698-4200 0698-4197 0698-4193

0698-4192 0698-4190 0698-4196 0757-0418 0757-0422

0698-4195 0698-4211

2100-1990

00427-61902

00427-61901 00427-69501

Table

7-1.

Replac

able

TQ

1

R: R: fxd

1 1 R:

1

R: 1 R: 1

R: 1

R:

1 R: 1 R:

1

R: 1 R: 1 R: fxd 1

R: 1

R: 2

R: 1

R:

fxd

ot

assigned

fxd

fxd fxd fxd fxd fxd

fxd fxd fxdprecmetflm1070ohms±l%

fxd fxd

fxdprecmetflm

varww200

DESCRIPTIO

prec

carbon

prec

met

prec

met

prec

met

prec

carbon

prec

met

prec

met

prec

met

prec

met£lm

prec

met£lm50ohms

prec

metflm

prec

met

prec

met

1 Switch: RANGE 1 Switch: FUNCTION

Conversion

Kit

Parts

(Cont'd)

flm

67.5

flm

675

ohms

flm

67. 6K

flm

682K

flm

7.5

£l,m

3419 £lm 1081 flm

ohms

341. 9

108.1

619

ohms

flm

909

ohms±1%

flm

1020

ohms

158K

ohms

±20%DCZERO/ncc

(to

Option

meg

±O.5%1/4

±O.

5 0

±O.5%1/4

meg

ohms

±O.

ohms

±O.

ohms

±O.

25%

±1%

1/8

01)

±1

1/8

±1%

1/4

25%

25% 25% 1/8

1/8

W

2 W

W

0 1 W

1/8

1/8W

1/8

W

FR. FR.

91637 DC2 75042

75042

75042 91637 75042 75042 75042

75042 75042 75042 75042 75042

75042 75042 71450

CEB CEB

CEB

DC-1

CEA CEA CEA

CEA CEA CEA CEA CEA

CEA CEA

Type

-hp-

Model 427A

PART

T-O T-O

T-O T-O T-O T-O T-O

T-O T-O

118

obd

obd obd

obd obd obd obd

obd obd obd obd obd

obd obd obd

O.

C1 CR1

J1 S3

S4

T1

W1

MP1 MP2 MP3 MP3 MP4

MP5 MP6 MP7 MP8 MP9

MP10 MP11

MP12 MP13 MP14

0180-1802

1901-0025

1251-2357

3101-1234

3101-0011

9100-132a

8120-1348

5060-5972

5060-0702 00427-00205 00427-00202

5000-8563

5060-0727

5040-0700

1490-0031

5000-8569 00427-00206

5020~852

0370-0311

1750A-64A 00427-00601

OPTION

fxd Al

1

C:

1

Diode:

1

Connector:

Switch:

1

,,-

1 Switch: 1

Transformer:

1

Power

elect

Si 100 rnAat+1

ac

slide slide

cord

MECHANICAL

SEE FIGURE

1

Cover:

top

2

Assembly:

1

Panel:

1

Panel:

2

Cover:

2

Assembly:

2

Hinge 1 Stand: 1

Cover: 1

Panel:

1

Meter 1

Thumbwheel:

Not 1

Holder: 1 Shield:

rear rear

side

tilt

bottom

front

trim:

assigned

trimmer

switch

(with

frame

(Option 01 only) 6 x 8

foot

third

01

150

/IF

power

cord

DPDT

115/230

DPDT

LINE/BATT

ac

power

handle)

6 x 8

sm

third

module

5 x 8

sm

module

DC ZERO/51

capacitor

+100% -10% 40

V 100

piv12pF

receptacle

PARTS

7-1

sm

stainless

(used

steel

with

vdcw

rod

C3)

56289

obd

-hp-

82389

42190 42190 4603

AC-3

4633 obd

-hp-

70903

KH-7041

-hp-

91260 obd

-hp-

obd

7-4

01791-3

Model 427A

REFERE DESIGNATOR

MP15 MP16

MP17

MP18 MP19

MP20 MP21

MP22

CE

-hp-

PART

NO.

00427-05501

1510-0009

0340-0099

1510-0008 1510-0037

0370-0077

00427-06401 00427-90005

Table

TQ

1 1

3

1 1

2 Knob: 1

1

7-1.

Shield: Assembly:

solder

Insulator:

0.500" with

anti-rotation

Assembly:

solder

Assembly:

solder

skirted

1/4"

diameter Holder: Manual:

Replaceable

DESCRIPTION

can

(Option 01 only)

binding

turret

brass,

binding

ODx0.200"

binding

turret

brass,

binding

turret

brass,

bar

battery

operating

post

5/8"

shaft

and

Parts

post

boss,

post post

(Cont'd)

black

plo

single

ill

x

VOLTS

plo

OHMS

plo

diameter

service

COM wia

J2

grey

0.090"

plo

J2 J2

J2

red

blue

plastic

thick

wlo

black

for

MFR.

-hp-

MFR.

Section

PART

VII

NO.

01791-2

7-5

Appendix

A

The

following code (Name to Code) and H4-2 (Code to Name) and supplements suppliers

not

numbers

used

appearatthe

appearingintheH4Handbooks.

CODE LISTOFMANUFACTURERS

are

from

the

Federal

bottomofeach

their

Supply Code

latest

page. Alphabetical

for

supplements.

Manufacturers

The

codes

Cataloging Handbooks H4-1

dateofrevision

have

been

and the dateofthe

arbitrarily

assigned

Model

427A

to

Code

No.

Manufacturer

00000

U.S.A.

00136 00213 00287 00334

00348

00373 00656 00779

00781

00809

00815 00853 00866

00891 00929 01002

01009

01121

01255

01281

01295

01349 01538

01589 01670

01930 01961 02114

02116

02286 02660

02735 02771 02777

02875

03508 03705 03797

03818

03877 03888 03954

04009

04013 04062

04217

04222

04354

04404 04651

04673

04713

04732. Flltron Co.,

04773

04796 04811 04870 04919

05006

Common

McCoy

Electronics

Sage

Electronics

Cemco Humidial Microtron

Garlock Aerovox Amp.

Aircraft

Croven

Northern Sangamo Goe

Engineering

CarlE.Holmes Microlab Inc. livingston,N.J. General

Alden

Allen Lillon Industries,

TRW Texas

TranSistor

The

Alliance

Small

PacifiC Relays, Gudebrod Amerock Pulse Ferroxcube

Wheelock Cole Amphenol·Borg

RadiO

and

Vocaline Hopkins

Hudson G.E.Semiconductor Apex Eldema Parke; Transitron Electric Pyrofilm ResistorCo.• Singer

Finderne

Arrow.

Taurus Arco

Essex

Hi·Q

PreciSion

Dymec Sylvania

Device Dakota Motorola,

Automatic Sequoia Precision Coil P.M.Motor Component

Twentieth

Corp.

Inc.

Co., Inc. Valley

Inc.

Corp.

Inc.

Radio

Corp.

ltd.

Engineering Laboratories, Electric Co., Pickens

Co.

Corp.

Electric Co., Capacitor

Products

Co.

Bradley

Co.

Semiconductors,

Instruments, Inc.,

Products

Mfg.

Paris

Inc.

Bros.

Silk

Corp.

Engineering

Corp.ofAmerica

Signals, Inc.

Rubber

and

Plastics Inc.

Electronics

Corp.ofAmerica,

Materials

Div.

Co.ofAmerica,

Engineering

Tool &

Die

Machine&Tool

Corp.

Seal

Co.

Co., Diehl Div.

Plant Sumerville,N.J.

Hart

and

Hegeman

Corp.

Electronic

Inc.

Wue

DivisionofAerovox

Paper

Tube

DivisionofHewlell·Packard

Electric Products,

Div.

Engr.

Inc.

Inc.,

Semiconductor

Inc.

Western

Electric

Wire

Co.

Spring

Company

Mfg.

Service

Century

Any

Mount

Whitby.

CityofIndustry,

Hudson

Inc.

Beverly

Inc.

Div. Dallas,

Co.

Corp.

Semiconductor

Inc.

DI~

San

Co.

Prod.

Dept.

Co.

Los

Corp.

Inc.

Elect.

Los

Co.

Microwave

Mountain

Prod.

Div.

Co.

Redwood

Co.

W.

Plastics, Inc.

Los

Address

supplierofU.

Holly

Springs,

Rochester,N.Y.

Danielson,

Conn.

Collon, Calif.

Stream,N.Y.

Cherry

Hill,N.J.

New

Bedford,

Mass.

Harrisburg,

Boonton,N.J.

Ontario

Canada

Inc.

Burlington,

Div.

Pickens,S.C.

Los

Angeles,

Calif.

Dept.

Falls,N.Y.

Brockton,

Mass.

Milwaukee,

Hills, Calif.

Lawndale,

Calif. Texas

Alliance.

Los

Angeles.

Calif.

Van

Nuys,

Calif.

New

York,N.Y.

Rockford,

Santa

Clara, Calif.

Saugerties,N.Y.

Long

Branch,N.J.

Sunnyvale,

Calif.

Broadview,

SORl'erville,N.J.

Saybrook,

Conn.

Fernando,

Calif.

Newark,

Syracuse,N.Y.

Dayton.

Compton,

Calif.

Angeles,

Calif.

Wakefield,

Knolls,N.J.

Co.

Harlford,

Great

Neck,N.Y.

Angeles.

Beach,S.C.

Wheeling,

Co.

Palo

Allo, Calif.

View, Calif.

City, Calif.

Div.

Phoenix,

City, Calif.

Northlake, III.

City, Calif.

EI

Monte,

Westchester,

Angeles,

Mass.

Conn.

Calif.

Arizona

Calif.

Mass. Calif.

Cedar

Lambertville, N.1.

Myrtle

Culver

Bridgewater,

Wis.

Ohio

N.J.

Ohio

Pa.

Wis.

Cal.

III.

Code

No.

Manufacturer

05245

Components

S.

05277

Pa.

05347

05397 05574

05593

05616 05624

05728 05729

05783 05820

06004

06090 06175 06402

06540 06555 06666

06751 06812

06980

07088

III.

07126 07137 07138

07149

III.

07233 07256 07261 07263

07322 07387

07397 07700

07829 07910 07933

07980 08145

08289 08358

08524 08664 08717 08718

08727 08792

08806 08984

09026 09134

Corp.

Westinghouse Ultronix,

Union

Viking

Icore

Cosmo Barber

Tiffen Optical Metro·Tel

Stewart Wakefield

Bassick Co., Div.ofStewart

Raychem Bausch

E.

Amatom Beede General

Components

Touington Varian

Kelvin Electric Digltran

Transistor Electronics

Westinghouse

Fllmohm C,nch·Graphlk Silicon TranSistor Avnet

Fairchild Minnesota

Butcher Corp.,

Sylvania

Technical Bodine Continental

Raytheon Hewlell·Packard Co., U.S.Engineering

Blinn,

Burgess

Deutsch

Bristol Co., Sloan ITT

Nalional CBS

Ceneral Mel·Raln

Babcock

Texas

Seml·Conductor

Inc.

Carbide

Ind.

Inc.

Electro·Plastics

Plastic

(c/o Electrical

Colman

Corp.

Engineering

Corp.

and

Lomb

T.A.Products

Electronic

Electrical

Devices

Inc., Ariz. Div.

Mfg.

Assoc.

Co.

Electronic

Tube

Corp.

Camera

Semiconductor

Rubber

Elecl.

Wire

Elect.

Device

Mfg.Co.•

Semiconductor

Delbert

Battery

Fastener

The

Company

Cannon

Electric

Radio

Electronics

Operations,

Electric

Relays

Capacitor

Electric

Corp.

Dept.

Corp., Elect. Div.

Inc.

Spec.

Co.)

Co.

Roslyn

Heights.

Co.

Inc.

Optical Co.ofAmerica

Hardware

Instrument

Co., Inc.

Co.,

West

Eimac

Div.

Co.

Corp.

Electric

Corp.

Div. Elmira,N.Y.

Co.

Corp.

& Inst.

Corp.

Div.

Co.

The

Prod.

Inc.,

Products

Inc.

Co.

Corp.

Div.

Boonton

Co.

Niagara

Corp.

Inc.•Phoenix

Lab.

Inc.

Semiconductor

DivofC.B.S.

Co.

Miniat.

Div.

Co.

Warner

Redwood

Co.

Co.,

New

Co.,

Div.

CityofIndustry, Calif.

Mountain

Monterey Mt. Mountain

Mountain

Falls,

Inc.

Lamp

Chicago,

Youngwood,

San

Mateo,

NewYork,N.Y.

Canoga

Park,

Sunnyvale,

Cleveland,

Rockford,

Long

Island,N.Y.

Westbury,N.Y.

Santa

Cruz,

Wakefield,

Corp.

Bridgeport,

City, Calif.

Rochester,N.Y.

Chicago,

Inc.

Rochelle,N.Y.

Inc.

Penacook,N.H.

Indianapolis,

Phoenix, Ariz.

Van

Nuys,

San

Carlos, Calif.

Van

Nuys,

Pasadena,

Minneapolis,

New

York,N.Y.

Carle

Place,N.Y.

Culver

City, Calif.

View, Calif.

Minneapolis,

Park,

View

Operations

View,

Cranford,N.J.

Chicago,

Hawthorne,

View, Calif.

Radio

Div.

Rockaway,

Lo.s

Angeles,

Pomona,

Ontario,

Los

Angeles,

Waterbury,

Sun

Valley, Calif.

Div.

Phoenix,

Paramus,N.J.

Lowell,

Dept.

Cleveland,

Indianapolis,

Costa

Mesa,

Houston,

Address

Calif.

Calif. Calif.

Calif.

Mass.

Conn.

Calif.

Minn.

Calif.

Calif. Calif.

Canada

Calif. Conn.

Arizona

Mass.

Calif. Texas

Ohio

Ind.

N.J.

Ohio Ind.

Code

No.

Manufacturer

III.

Pa.

III.

Tech.

Ind.

Inc.

Atohm

09145

Electro Assemblies,

09250

C & K

09353

09569

09922

10214 10411

10646 11236 11237

11242

11312 11314 11453

11534

11711

11717

11870 12040

12136

12361 12574

12697 12728

12859

12881

12930

12954 13019

13103

13396

13835

14099

14193

14298

14433

14493 14655

14674 14752

14960 15106

15203

15287 15291 15558

15566 15631 15772

15801 15818 16037 16179 16352 16585 16688

16758 17109 17474 17554 17675

17745

17856

Components

Mallory

Ballery

Canada,

Burndy

Corp.

General

TranSistor

Ti·Tal, Inc. Carborundum CTSofBerne. Chicago

TelephoneofCalifornia,

Bay

State

Electronics

Teledyne

Inc.,

Seal

National

Connector

Precision

Duncan

Electronics Inc.

General

Instrument

Div., Products

Imperial

Electronic,

Melabs.

Inc.

National

Semiconductor Philadelphia Grove

Mfg.

Gullon

Ind.

Clarostal

Mfg.

Elmar

Filter

Nippon

Electric Co., Ltd.

Metex

Electronics

Della

Semiconductor

Dickson

Electronics

Auco

SupplyCo.. Thermolloy Telefunken Mldland,Wflght Div.ofPacific Industries, Inc.

Sem·Tech Calif. Resistor American

Components,

ITT

Semiconductor,

&

Telegraph

Hewlell·Packard

Cornell

Dublier Electric

Corning

Glass

Electro

Cube

Williams

Mfg.

The

SphereCo..

Webster

Electronics

Scionics

Corp. Adjustable Micron

Electronics

Amprobe

Inst.

Cabletronics

Century

Twentieth Fenwal

Elect.

Amelco

Inc.

Spruce

Pine

Omni'Spectra

Computer

Diode

Boots

Aircraft

Ideal

Prec.

De

Jur

Meter

Delco

Radio Thermonetics Tranex

Company Components Hamlin

Metal Angstrohm Slliconix

Inc.

Elect.

Inc.

Co.

of

Ltd.

Co.,

Inc.

Corp.

(GmbH)

Bushing

Mica

Meier

Inc. Biddeford,

Prec.

Toronto, Ontario,

Western

Co.

Inc.

Corp.

Microwave

Div.

Corp.

Corp.,

Semiconductor

Group

Inc.

Handle

Co.

Inc.

Data

System

Co.

Corp.

InC. Corp.

Inc.

Corp.

Inc.

A Div.01Int.

Corp.

West

Company

Corp.

Works

Inc.

Co.

Inc.

Co. Co.

Garden

City,

Corp.

Coil

Spring

Inc.

Co.

Inc.

Corp.

Nut

Corp.

Co., Inc.

Div. Brooklyn,N.Y.

Div.ofG.M.Corp.

Inc.

Products

Corp.

Inc.

Corp.

Niagara

So.

Div.

Newport

Kansas

Newbury

Santa

N.

Co.

Canoga

Mountain

No.

Address

Burbank,

Calif.

Chicago,

Newton,

Mass.

Canada

Norwalk,

Conn.

Los

Angeles,

Calif.

Berkeley, Calif.

Falls,N.Y.

Berne,

Inc.

Pasadena,

Calif.

Wallham,

Mass.

Palo

Allo, Calif.

Downey,

Calif.

Jamaica,N.Y.

c.osta

M&5a,

Calif.

Newark,N.J.

Buena

Park.

Calif.

Palo

Alto, Calif.

Danbury,

Conn.

Camden,N.J.

Shady

Grove,

Albuquerque,N.M.

Dover,N.H.

W.

Haven,

Conn.

Tokyo,

Japan

Clark,N.J.

Beach,

Scottsdale,

Conshohocken,

San

Long Costa Santa

Framingham,

Spruce

Calif.

Arizona

Witchlla.

Kansas

Dallas,

Texas

Hanover,

Germany

City,

Kansas

Park,

Calif.

Monica,

Calif.

Telephone

Palm

Beach,

Loveland,

Colo.

Newark.N.J.

Corning,N.Y.

Gabriel, Calif.

San

Jose,

Calif.

Lillie Falls. N.J.

New

York,N.Y.

Northridge, Calif.

Hollywood, Calif.

Island,N.Y.

Lynbrook,N.Y.

Mesa,

Calif.

Clara,

Calif. Mass.

Mt.

View, Calif.

Pine,N.C.

Farmington,

Hollywood, Calif.

Lodi,N.J.

Pa~adena,

Calif.

Kokoma,

Park,

Calif.

View, Calif.

Akron,

Sunnyvale.

Calif.

Mich.

Ind.

Pa.

Fla.

Ind.

Ma.

Ohio

1If.

00015-48

ReVised

October.

1969

From:

FSC.

Handbook

Supplements

Model

427A

Appendix

A

Code

Manufacturer

No.

McGraw·

17870

18042

Power Clevlte Corp.,

18083

Signetics

18324

Ty·Car

18476

TRW

18486

Curtis Instrument,

18583

Vishay

18612 18873

E.1. Durant

18911 19315

The

19500

ThomasA.Edison

McGraw-Edison

Concoa

19589

19644

LRCElectronics Electra

19701

General

20183

Executone,

21226

Fafnir

21335

Fansteel Metallurgical

21520

Texscan

23042

British

23783 24455

G.E.Lamp

24655

General

24681

Memcor Parelco

24796 26365

Gries Grobet

26462

Compac/HolI,ster

26851

Hamilton

26992

Specialities

27251

Hewlett·Packard

28480

Heyman

28520 30817

Instrument G.E.Receiving

33173 35434

Lectrohm

36196

Stanwyck Cunningham,W.H.

36287 37942

P.R.Matlory &

39543

Mechanical

40920

MIniature

42190

Muter

43990

C.A.Norgren

44655

Ohmite Penn

46384 47904

Polaroid

48620

Precision

49956

Microwave&Power

52090

Rowan

52983

Sanborn

54294

Shallcross

55026

Simpson

55933

Sonotone

55938

Raytheon

Systems

56137

SpauldIng

56289

Sprague

59446

Telex

59730

Thomas

60741

Triplett Electllcal Insl.

61775

Union

Westinghouse

Edison

Oesign

Pacific

Corp.

Mfg.

Co.,

Elecl.

Compo

Instruments

OuPont

and

Mfg.

Co.

Bendix

Corp., Navigation &

Mfg.

Co.

Atronics

Inc.

Bearing

Co.,

Corp.

Radio

Electronics Ltd.

Division

Radio

Co.

Inc.,

Compo

Inc.

Reproducer

File

Co.ofAmerica,

Watch

Co.

Mfg.

Co.

Specialties Co.,

Inc.

Corl

Products

Industrres

Precision Bearings,

Co.

Mfg.

Co.

Eng.&Mfg.

Corp.

Thermometer

Controller

Company

Mfg.

Co.

ElectriC

Corp.

Co.

Commercial

Div.

Fibre Co.,

Electric

Corp.

& Betts

Switch

and

Air

Co.

Inc.

Semiconductor

Inc.

Oiv.

Inc.

Co.,

Inc.

Industries, Div.

Co.

Corp.

The

Corp.

Nela

Div.

San

Corp.

Co.

Co., Inc.

Co.

Tube

Depl.

Ltd.

Hawkesbury,

& Hill, Ltd.

Toronto

Co.

Inc.

Prod.

Corp.

& Insl.

Tube

Div.

Co.

Apparatus

Inc.

Co.

Signal,

Div.

Brake

Co.

Manchester,N.H.

Palo

Oiv.

Palo Sunnyvale,

Holliston, Oes loll.

Wilm Milwaukee,

Control

Teterboro,N.J.

of

West

Baldwin

Horseheads,N.Y.

Independence,

Philadelphia,

Long

Island City,N.Y.

New

Britain,

N. Indianapolis, Washington,D.C.

Park,

Cleveland,

West

Concord,

Huntington,

Juan

Capistrano, Calif.

New

Rochelle,N.Y.

Inc.

Carlstadt,

Hollister, Calif.

Lancaster,

Stratford, Palo Kenilworth,N.J.

Inc.

Little Falls,N.J.

Owensboro,

Ontario, Ontario,

Indianapolis,

Co.

Inc.

Englewood,

Doylestown,

Cambridge,

Co.

Southampton,

Waltham,

Westminster,

Waltham,

Elmsford,N.Y.

&

So.

Norwalk,

Tonawanda,N.Y.

North

Adams,

Elizabeth,N.J.

Bluffton,

of

Pittsburgh,

CODE LISTOFMANUFACTURERS

Code

No.

62119 63743 64959 65092 66295 66346

70276 70309 70318

70417 70485 70563 70674 70903 70998 71002

71034

71841

71218 71279 71286 71313

71400 71436

71447 71450 71468 71471 71482 71590

71616 71700 71707 71744 71785

71984

72136 72619 72656

/2699 72765 72825 72928 72962 72964 72982 73061 73076 73138

73293

73445

73506 73559 73586 73682

73734 73743 73793

73846

Manufacturer

Universal Electric Ward-Leonard Western Weston Wittek

Minnesota

Allen Allied Allmetal

Amplex, Atlanlrc Amperite ADC Belden Bird Birnbach Bliley ElectriC Co., Boston

Bud

Camblldge

Camloc Cardwell

Bussmann

Chicago Calif. CTS ITT

Cinema,

C.P.Clare&Co. Centralab

Commercial Cornish

Coto Chicago Cinch

Dow

Electro Dialight Indiana

General Drake HughH.Eby Gudeman Elashc RobertM.Hadley Erie Hansen H.M.Harper Helipot

Hughes Amperex

~radley

Carltng

Circle F

GeorgeK.Garrett Federal

Fischer General Goshen

Electric

Electric Co.,

Insl.

Inc.

Mfg.

Co.

Mining&Mfg.

Mfg.

Co.

Control

Screw

Product

Div.ofChrysler India

Rubber

Co.,

Inc.

Products

Inc.

Mfg.

Co.

Electronic

Corp.

Radio

Co.

Gear

Works

of

Texas

Radio,

Inc.

Thermionics

Fastener

Corp.

Condenser

Mfg.

Div.ofMcGraw·Edison

Condenser

Spring

Co., Corp. Cannon

Electric

Div.

Aerovox

Div.ofGlobe

Plastics

Wire

Co.,

Coil Co., Inc.

Miniature

Mfg.

Co.,

HowardB.Jones

Corning

Corp.

Motive

Mfg.

Corp.

General

Corp., Electronics Div.

Instrument

Mfg.

Co.

Inc.

Co.

Stop

Nut

Corp.

Technological Products, Inc.

Industlles

Co.

Mfg.

Co., Co.

Dlv.ofBeckman Products

DivisionofHughes

Co.

Elect

Co.

SemIconductor

Eleclrlc, Inc.

Mfg.

Co.

Co., Div.

Inc.

Screw

Products

SpeCial

Mfg.

Industries Co.,

Stamping&Tool

Address

Alto, Calif. Alto, Calif.

Calif.

Mass.

Plaines, III. Kisco,N.Y. Malvern,

Pa.

ington,

Oel. Wis.

Div.

Orange,N.J.

Park,

Calif.

Kansas

Pa.

Conn.

Chicago,

III.

Ind.

Ohio

Mass.

Ind.

N.

J.

Pa.

Conn.

Alto, Calif.

Ky.

Chicago,

III. Canada Canada

Ind.

Akron,

Ohio Keene,N.H. Chicago,

III.

Colo.

Skokie,

III. Pa.

Mass.

Pa.

Mass.

Md.

Mass.

Selma,N.C.

Chicago,

III. Aircraf t

Conn. Mass.

Tulsa,

Okla.

Ohio

Pa.

Co.

Co. Inc.

Weston-Newark

Co.

Revere

Co.,

Inc.

Corp.

Works,

Inc.

Div.ofMurray

Corp.

LindenhurstL.I., N.Y.

Corp.

Inc.

Corp.

Union

Co.

The

Lamp

Works

Co., Inc.

Corp.

,

Cap.

Harwood

Los

Inc.

Insl.,

Newport

Hicksville,

Corp.

MSL

Inc.

Co.

The

Co.

(Continued)

Address

Owosso,

MI.

Vernon,N.Y.

New

York,N.Y.

Newark,N.J.

Chicago,

Mincom

SI.

Paul,

Hartford,

New

York,N.Y.

Garden

City,N.Y.

Detroit,

Chicago,

Union

City,N.J.

Minneapolis,

Chicago,

Cleveland,

New

York,N.Y.

Erie,

Co.

Quincy,

Mass.

Willoughby,

Cambridge,

Paramus,N.J.

Co.

SI.

Louis,

Chicago,

Pico-Rivera, Calif.

Elkhart,

Los

Angeles,

Calif.

Burbank,

Calif.

Chicago,

Inc.

Milwaukee,

Chicago.

New

York,N.Y.

PrOVidence,

Chicago,

Div.

Chicago,

Midland,

Brooklyn,N.Y.

Keasby,

Div.

Newark,N.J.

Heights, III.

Philadelphia,

Chicago,

Union,N.J.

Angeles,

Erie,

Princeton,

Chicago,

Fullerton, Calif.

Beach,

L.I.,N.Y.

Haven,

Hartford,

Trenton,N.J.

Philadelphia,

Chicago,

Cincinnati,

Elyria,

Goshen,

Mich.

Conn.

Calif.

Calif. Conn.

Conn.

Willimantic,

Inc.

New

Mich.

Oiv. Minn.

Conn.

Mich.

Minn.

Ohio

Mass.

Mo.

Ind.

III.

Wis.

III.

R.1.

III. III.

N.J.

Pa.

III.

Ind.

III.

Pa.

III. Ohio Ohio

Ind.

Code

No.

Manufacturer

JFO

Electronics

73899

Jennings

73905

73957

Groov-Pin

Signalite

74276

J.H.Winns,

74455

III.

74861

Industrial

74868

R.F.Products OivisionofAmphenol-Borg

Electronics

74970

E.F.Johnson

International

75042 /5263

Keystone

CTS

75378 75382

III.

Pa.

III.

Pa.

Kulka Lenz

75818

Littlefuse,

75915

Lord

76005

C.W.Marwedel

76210

General

76433 76487

James

76493

J.W.Miller

Cinch·Monadnock,

76530

Fastener

76545

Mueller Electric

National

76703

Oak

Manufacturing

76854

The

Bendix

77068

Pacific

77075

Phanostran

77221

Philadelphia

77252 77342

American

& Brumfield Dlv.

77630

TRW

77638

General Resistance

77764

Rubbercraft

77969

78189

Shakeproof

Sigma

78277 78283

Signal

78290

Struthers·Dunn

Speciality

/8424

Thompson-Bremer&Co.

78452

Ti

lIey

78471

Stackpole

78488

Siandard

78493

T,nnerman

78553

Transformer

78790

Ucinite

78947 79136

Waldes Veeder

79142

Wenco

79251

Contlnental,Wllt Electronics

79727

Zierick

79963

Mepco

80031

Prestole

80033

Schnitzer

80120

Electronic Industries Association.

80131

Tube

Unimax

80207

United

80223

Oxford

80248

Bourns

80294 80411

Acro

Div.ofRobertshaw

Corp.

Radio

Mfg.

Corp.

Inc.

and

Sons

Condenser

Corp. Co.

Resistance

Carbon

Co., Inc.

Knights Inc.

ElectriC

Corporation

Electric

Mfg.

Co.

Inc.

Mfg.

Co.

Instrument Corp.,

Millen

Mfg.

Co.,

Co.

Div.ofUnited

Corp.

Co.

Union

Co.

Corp., Electrodynamics

Metals

Co.

Instrument

Steel

and

Machine&Foundry

Electronic

Components

Instrument

Corp., Rectifier Div.

Products

Corp.ofCalif.

DiviSionofIllinois Tool

Indicator

Corp.

Inc.

Leather

Prod.

Mfg.

Co.

Carbon

Co.

Thomson

Corp.

Products, Inc.

Engineers Co. Kohinoor

Inc.

Root,

Inc.

Mfg.

Co.

Mfg.

Corp.

DiVisionofSessions

Corp.

Alloy

Products

meeting

EIA

SWitch,

Transformer Electric

Inc.

Standards·Washil1gton,

Dlv.

Corp.

and

Wire

Co.

Maxon

Co.

Micamold

Inc.

San

Electronic

South Corp.

Div.

Co.

San

Long

Corp.

Clock

Co.

Electronics

Controls

San

Los

N.

Co.

So.

Newtonville,

New

Address

Brooklyn,N.Y.

San

Jose,

Ridgefield,N.J.

Neptune,N.J.

Winchester,

Chicago,

Oanbury,

Waseca,

Philadelphia,

SI.

Marys,

Sandwich,

loll.

Vernon,N.Y.

Chicago,

Des

Plaines, III.

Erie,

Francisco, Calif.

Division Newark,N.J.

Malden,

Angeles,

Carr

San

Leandro,

Cleveland,

Newark,N.J.

Crystal Lake, III.

Div.

Hollywood, Calif.

Francisco, Calif.

Co.

Pasadena,

Philadelphia,

Potter

Princeton,

Camden,N.J.

Brooklyn,

Harrisburg,

Torrance,

Works

Elgin, III.

Braintree,

New

York,N.Y.

Pitman,N.J.

Newark,N.J.

Chicago,

Francisco, Calif.

SI.

Marys,

Waltham,

Cleveland,

San

Gabriel, Calif.

Island

City, N.Y.

Hartford,

Chicago,

Philadelphia,

Rochelle,N.Y.

Co.

Morristown. N.J.

Toledo.

Elizabeth,N.J.

Any

brand

DC.

Corp.

Wallingford,

New

York,N.Y.

Chicago,

Riverside, Calif.

Co.

Columbus,

Calif.

Mass.

Conn.

Minn.

Mass. Calif.

Calif.

Ohio

Calif.

Ind.

N.

Calif.

Mass.

Ohio Mass. Conn.

Pa.

OhiO

Conn.

Ohio

III.

Pa. Pa. III.

III.

Pa.

Y.

Pa.

III.

Pa.

III.

00015-48

ReVised'

Oclober,

1969

From:

FSC.

Handbook

Supplements

Appendix

Model

A

427A

Code

No.

Manufacturer

All

Star

80486 80509 80583 80640 80813 81030 81073 81095 81312

81349

81483 81541 81860

82042 82047

82116 82142

82170 82209

82219 82376

82389 82647

82768 82866 82877 82893

83014

83058 83086

83125 83148

83186

83298 83315 83324 83330

83332

83385 83501

83594 83740 83777

83821

83942

84171 84396 84411 84970 85454 85471 85474 85660

85911 86174 86197

86579

Products

Avery

Label

Co.

Hammarlund

Co., Inc.

Stevens,

Arnold, Co.,

Dimco

Gray

Co. International Instruments Inc. Grayhill

Co.

Triad

Transformer

Winchester

Elec. Div. Litton Ind., Inc.

Military Specification International Rectifier

Airpax

Electronics, Inc.

Barry

Controls,

Div.

Carter

Precision Electric

Sperti

Faraday

Electric Div. Electric Jeffers Electronics DivisionofSpeer

Carbon Fairchild System Magulfe Sylvania

Electronic Astron SWitchcraft, Metals

Phillips·Advance Research Rotron Vector

Hartwell

Carr New

General ITT

Victory Bendix Hubbell

Rosan

Smith, Tech Central Gavitt

Div.ofAmerace Burroughs

Union

Model Loyd

Aeronautical Inst. &

Area A.J.Glesener TRW Sarkes Boonton A.B.Boyd R.M.Bracamonte&Co. Koiled Seamless Fafnir Clifton Precision Products Co.,

Precision

Inc.,

Regulator

Co.

Camera

Div.

Industries,

Electric

Tube

COTp.

Inc.

& Controls Inc.

Products

Mfg.

Co., Inc.

Electronic

Corp.

Fastener

Co.

Hampshire

Ball

Instrument

Wife

and

Cable

Eng.

Corp.

Corp.,

Red

Corp.

Inc.

Herman

H., Inc.

Labs

Screw

Co.

Wire

and

Cable

Corp.

Electronic

Carbide

Corp.

Eng.

and

Mfg., Inc. Huntington,

Scruggs

Co.

Electronics Inc.

Co.,

Capacitor

Div.

Tarzian,

Inc.

Molding

Company

Co.

Kords,

Inc.

Rubber

Co.

Bearing

Co.

Rubber

Products

Inc. Defiance,

Corp.

Barry

Copper

Corp.

& Inst.

Inc.

Prod.

Division

East

Control

Corp.

Co.

Bearing,

Corp., Capacitor"Oiv.

Div.

Bank

Corp.

Consumer

Radio

Inc.

Monrovia,

Mars

Inc.

Corp.EISegundo,

Spencer

Co.

Cambridge,

Wright

Walertown,

Co.

Hewitt

Corp.

Space&Defense

Greenwich,

Inc.

Newark,

Products

Attleboro,

Co.

Woodstock,N.Y.

Los

Cambridge,

Inc. /

Peterborough,N.H.

•Darlington,

Los

Springfield,

Div.

Newport Palisade's

Brookfield,

Tube

Div.

Prod.

Co.

Great

San

Francisco, Calif.

Bloomington,

San

Francisco, Calif.

San

Francisco, Calif.

Los

Inc.

Clifton Heights,

Corp.

Boston,

Dayton, Orange, LaGrange, Venice, Calif.

Oakville,

Corp.

Skokie,

Hoboken,N.J.

Norwalk,

Du

Paramus,

Emporium, Harrison,N,J,

Chicago,

Madison,

Glendale,

Angeles( Calif.

Angeles,

Red

Bank,N.J.

Mundelein,

Beach,

Brooklyn,N.Y.

Park,N.J.

Chicago,

Plainfield,

Div.

New

York,N.Y.

Festus,

Lodi,N.J.

Neck,N.Y.

Ogallala,

Boonton,N.J.

Hamden,

Chicago,

Angeles,

Dayton,

Hill,N.C.

Bois,

Joliet, III.

CODE LIST OF MANUFACTURERS

Ohio

N.J.

Wis.

Ind.

Mo.

Ind.

Pa.

III.

Pa.

Pa. III.

C.

J.

III.

J.

III.

Code

No.

Manufacturer

86684

Radio

Corp.ofAmerica,

Camp.&Devices

86928

Seastrom

87034

Marco

87216 87473

87664 87930 88140

88220 88698 89231 89473 89665 90030 90179USRubber

90763 90970 91146 91260 91345 91418 91506 91637 91662 91737 91827 91886 91929

91961 92180 92367 92607

92702 92966 93332

93369 93410

93632

93929 94137

94142

94144

94148 94154

94197 94222

94330 94375 94682

94696 95023

95236 95238 95263 95265 95275 95348

95354

Industries

Philco

Corporation Western Van

Waters&Rogers

Tower

Mfg. Cutler-Hammer, Gould-National Batteries,

General

Graybar

G.E.Distributing United

Transformer

United

Shoe

Prod.

United

Carr

Bearing

ITT

Cannon

Connor

Spring

Miller

Dial&Nameplate

Radio

Materials Augatlnc. Attleboro, Dale

Electronics,

Elco

Corp.

Gremar

Mfg.

K F

Development

Malco

Mfg.

Honeywell Nahm·Bros.

Tru-Con Elgeet Optical Tensolite Insulated

IMC

Magnetics

Hudson

Lamp

Sylvania

Semiconductor Robbins&Myers StemcoControls, Div. of

Waters

Mfg. G.V. Controls General Phe

Ips0odge

Raytheon

Camp.

Scientific Electronics Products, Wagner

Elect. Corp.,

Curtiss·Wright South

Chester

Wire

Cloth Automatic Worcester

Magnecraft GeorgeA.Philbrick

Allies Products Corp.,

Continental Leecraft National Coil Vi

tramon,

Gordos

Corp.

Methode

Mfg.

Div. Harrison,N.J.

Mfg.

Co.

(Lansdale Division)

Fibrous

Glass

Inc.

Corp.

Inc.

Mills,

Inc.

Electric

Co.

Corp.

Co.

Machinery

Co.,

Consumer

Div.

Fastener

Corp.

Engineering

Co.

Elect, Inc.,

Mfg.

Co.

Inc.

Co.,

Inc.

Co.

Co., inc.

Inc.,

Micro

Spring

Co.

nectar

Corp. Co.

Inc. Wire

Corp.

Co.

Electric

Prod. Div. Inc.

Co.

Cable

Corp.

Co.,

Camp.

Operations

Tung-Sol

Corp.

Electronics Div.

Corp.

Products,

Inc.

Metal

Products

Pressed

Aluminum

Electric

Co.

Researchers,

Connector

Mfg.

Co.,

Inc.

Co.

Inc.

Co.

Corp.

Switch

Div.,

Corp.

Electronic

Products

Inc.

Ind.

Salem

Co.

Co.,

Wesbury

Inc.

Essex

Co.

San San

Redwood

Palisades

Ind.

East

Corp.

Rolling

Address

Calif. Mass. Conn.

Conn. Calif.

Maryland

Mass.

Conn.

Mass.

Calif. Mass.

S.

Calif.

N.

Calif.

Mass.

N.

Neb.

Conn.

Calif.

Ohio

(Continued)

Address

Glendale,

Anaheim,

Lansdale,

Co.

Francisco, Calif.

Providence,

Lincoln, III.

St.

Paul,

Buffalo,N.Y.

Oakland,

Schenectady,N.Y.

Chicago,

Beverly,

& Plastics

Passaic.N.J.

Chicago,

Francisco, Calif.

Div.

Salem,

Francisco, Calif.

EI

Monte,

Chicago,

Columbus,

Willow

Grove,

Wakefield,

City, Calif.

Chicago,

Div.

Freeport,

Oakland,

Peabody,

Rochester,N.Y.

Inc.

Tarrytown,N.Y.

Long

Island,N.Y.

Kearney,N.J.

Woburn,

Park,N.J.

Wire

Corp.

Mansfield,

Culver

City, Calif.

Livingston, N.J.

Bayonne,N.J. Yonkers,N.Y.

Quincy,

Inc.

Loveland,

Div.

Newark,N.J.

Paterson,N.J.

Chester,

Bellwood, III.

Brooklyn,N.Y.

Worcester,

Chicago,

Inc.

Boston,

Dania,

Woodside,N.Y.

Long

Island,N.Y.

Sheridan,

Bridgeport,

Bloomfield,N.J.

Meadows,

Calif. Calif.

Minn.

Calif.

Mass.

Mass. Calif. Mass.

Nebr.

Mass.

Calif. Mass.

Mass.

Ohio

Mass. Colo.

Mass.

Fla.

Wyo.

Conn.

Pa.

R.1.

III.

Pa.

III. III.

Pa.

III.

Code

No.

Manufacturer

Arnold

95566

95712 95984 95987

96067

96095 96256 96296

96306 96330

96341 96501

96508

96733 96881

97464 97539 97979 97983

98141 98159 98220

98278 98291 98376 98410 98731

98734 98821

98978 99109

99313 99378

99515

99707 99800

99848

99928

99934 99942

99957

THE

ASSIGNEDINTHE

FEDERAL

HANDBOOK.

OOOOF OOOOZ

OOOAB OOOBB

OOOCS OOOMM

OOONNA"N"0Mfg. OOOQQ OOOWW OOOYYS.K.

Engineering

Dage

Electric Co.,

Siemon

Mfg.

Weckesser

Co.

Microwave

Assoc.,

Hi·Q

Div.ofAerovox

Thordarson·Meissner

Solar

Manufacturing

Microswitch, Div. Carlton

Screw

Microwave

Associates,

Excel

Transformer

Xcellte

Inc.

San

Fernando

Thomson

Ind. Industrial Retaining Automatic

& Precision

Reon

Resistor

Litton

System

Commun.

Div. R-Troncis, Inc. Rubber

Teck, Inc.

Hewlelt·Packard Co.,

Microdot,

Inc.

Sealectro

Corp.

Zero

Mfg.

Co.

Etc

Inc.

General

Mills Inc.,

Paeco

Div.ofHewlett-Packard

North

Hills Electronics,

International Electronic Columbia

Technical

Varian

Associates

Attee

Corp. Marshall Ind., Capacitor Control

Switch

of

America

Delevan

Electronics

Wilco

Corporation Branson

Corp.

Renbrandt,

Inc.

Hoffman

Electronics

Semiconductor

Technology

Instrument

FOLLOWINGHPVENDORS

LATEST

SUPPLY

Malco

Tool

Willow

Leather

ETA Precision

Instrument

Hewlett·Packard

Rubber

Eng.&Development

Cooltron

California

Smith

Eastern

Co.

Inc.

Co.

West

Inc.

Corp.

Inc.

Co.

of

Minn.

Co.

Inc.

Co.

Elect.

Mfg.

Inc.

Ring

Co.

Mfg.

Corp.

Inc.,

Adler·Westrex

Moseley

Electronics Div.

Inc.

Research

Corp.

Div.

Division, Controls

Corp.

Div.

Corp.ofCalif.

HAVENONUMBER

SUPPLEMENTTOTHE

CODE

FOR

MANUFACTURERS

and

Die

Products

Components

Co_,

Colorado

Co.

Lab.

Co.

Sunnyvale,

Mt.

Los

Angeles,

-Honeywell

Burlington,

Oakland,

Orchard

Co.

San

Fernando,

Long

Irvington,N.J.

Englewood,N.J.

New

Rochelle,N.Y.

Gardena,

Div.

Pasadena,

So.

Pasadena,

Mamaroneck,N.Y.

Burbank,

Cleveland,

Minneapolis,

Co.

Palo

Glen

Corp.

Burbank,

New

Palo

Winchester,

Monrovia, Co.

EI

Segundo,

East

Indianapolis,

Whippany,N.J.

EI

Newbury

Los

Angeles,

Corp.

Co.

Van

Springs

Springs,

Hayward,

San

Oakland,

Burlington, Calif.

Los

Angeles,

Address

Marengo,

Franklin,

Wayne,

Chicago,

Calif.

Olean,N.Y.

Carmel,

Calif.

Freeport, Chicago,

Mass.

Calif.

Park,

N.Y.

Calif.

Is.,N.Y.

Yonkers,N.Y.

Jamaica,N.Y.

Caiif.

Calif.

Calif. Calif.

Ohio

Minn.

Alto, Calif.

Cove,N.Y.

Calif.

York,N.Y.

Alto, Calif.

Mass. Calif.

Calif.

Aurora,N.Y.

Ind.

Boston,

Mass.

Monte,

Calif.

Park,

Calif.

Newark,N.J.

England

Nuys,

Calif.

Colorado

Calif.

Jose,

Calif. Calif.

Calif.

Ind.

III.

III. III.

III.

00015-~8

ReVised'

October.

1969

From:

FSC.

Handbook

Supplements

Model

427A

Appendix

B

UNITED

ALABAMA P.O.

Box 2003 Byrd Spring Huntswllle 35802 Tel: (205) 881·4591 TWX:

ARIZONA 3009 North Scottsdale SCottsd.le Tel: (602) 945·7601 TWX:

910·950·1282 DELAWARE

5737

East Tucson Tel: (602) 298·2313 TWX:

91()..952·1162

CALIFORNIA 1430 East Orangethorpe Fullerton Tel: (714) 870·1000

3939

Lankershlm Boulevard

North

Tel: (213) 877·1282 TWX:

910-499·2170

1101

Embarc.dero

,.10

Ano 94303 Tel: (415) 327·6500 TWX:

910·373·1280

2591

Carlsbad S.cramento Tel: (916) 482·1463 TWX:

910·367·2092

1055 Shafter Street hn

Diego 92106 Tel: (714) 223·8103 TWX:

910·335-2000

COLORADO 7965

East Englewood 80119 Tel: (303) 771·3455 TWX:

91()"935-0705

4207

810·726·2204

85251

Broadway

85716

92631

HolIJWood

Avenue

95821

Prentice

STATES

Road

S.W.

Road

Ave.

91604

Road

CONNECTICUT

508

Tolland Street

East

H.rtford

710-425·3416

East

Avenue

06851

710·468·3750

Kennett

510-666·2214

Box

545

106

N.E.

2nd

Shores 33153

81()"848·7262

Box

20007

Commonwealth

810·850-0113

Box

8128 Beach

150th

Avenue

'etersburg

810·863·0366

Box

28234

lntersllte

30328

81()"

766-4890

Howard

Street

91()"223-3613

06108

Pike

Avenue

33708

North

Tel: (203) 289·9394 TWX:

111 Norw.lk Tel: (203) 853-1251 TWX:

3941 Wilmington 19807 Tel: (302) 655-6161 TWX:

FLORIDA P.O. Suite 9999 MI.ml Tel: (305) 754·4565 TWX:

P.O. Herndon Station 32814

621

Orl.ndo

Tel: (305) 841·3970 TWX:

P.O. MadeIra 410 St. Tel: (813) 391·0211 TWX:

GEORGIA P.O. 450 AtI.nt. Tel: (404) 436·6181 TWX:

ILLINOIS 5500 Skokie 60076 Tel: (312) 677·0400 TWX:

Avenue

SALES

INDIANA 3839 Meadows Drive Indl.napolls 46205 lei:

(317) 546·4891

TWX: LOUISIANA

P.O.

Box 1942 Williams Boulevard Kenner 70062 Tel: (504) 721·6201 TWX:

MARYLAND 6707 Whitestone B.ltlmore Tel: (301) 944-5400 TWX:

P.O.

Box

2

Choke RockYllle 20850 Tel: (301) 948·6370 TWX:

MASSACHUSETTS

32

Hartwell

uxlnglon

Tel: (617) 861·8960 TWX:

MICHIGAN

24315 Northwestern HIghway

Southfield 48075

Tel: (313) 353·9100 TWX:

MINNESOTA 2459 University St.

'.ul Tel: (612) 645·9461 TWX:

910-563·3734

MISSOURI 11131 Colorado K.nsas City 64137

Tel: (816) 763·8000

TWX:

910-771·2087

& SERVICE OFFICES

810-341·3263

856

810·955·5524

Road

21207

710·862·0850

1648

Cherry

Road

71()"828·9684

Ave.

02173

710-326·6904

810·232·1532

Avenue

55114

Ave.

2812 South Brentwood Blvd. St. Louis 63144 Tel:,

(314) 962-5000

TWX:

910·760·1670

NEW

JERSEY

W.

120 Century Ro.d

Paramus

07652 Tel: (201) 265·5000 TWX:

710·990-4951

1060

N.

Kings Highway

Cherry

Hili

08034 Tel: (609) 667-4000 TWX:

71()"892-4945

NEW

MEXICO

P.O.

Box

8366 Station C 6501

Lomas

Boulevard

255-5586

88001

Avenue

Isl.nd

N.E.

Road

11576

Albuquerque 87108 Tel:

(50S)

TWX:

910·989·1665

156

Wyatt Drive

lis

Cruces Tel: (505) 526·2485 TWX:

910-983·0550

NEW

YORK

1702 Central Albany 12205 Tel: (518) 869·8462 Portl.nd 97225 TWX:

710·441·8270

1219

Campvllie Endicott 13760 Tel: (607) 754-0050 TWX:

510-252·0890 82

Washington Street Poughkeepsie 12601 Tel: (914) 454·7330 TWX:

510·248-0012

39

Saginaw Drive Rochester 14623 Tel: (716) 473·9500 TWX:

510-253·5981

1025

Northern Boulevard

Roslyn,

Long Tel: (516) 869·8400 TWX:

510-223·08U

East

Molloy

5858 Syr.cuse 13211 Tel: (315) 454-2486 TWX:

710·541·0482 Richardson 75080

NORTH

CAROLINA

P.O.

Box

5188

1923

North Main Street

High Point 27262

Tel: (919) 885·8101

TWX:

510·926·1516

OHIO

25575 Center Ridge Ro.d Clevellnd 44145

Tel: (216) 835·0300

TWX:

810-427·9129

3460 South Dixie Drive

D.yton 45439 Tel: (513) 298-0351 TWX:

81()"459-1925

OKLAHOMA 2919 United Founders Boule :ard

Olll.homa City 73112 Tel: (405) 848·2801 TWX:

910·830-6862

OREGON Westhllls Mall, Suite 158 4475

S.W.

Scholls Ferry

Tel: (503) 292·9171 TWX:

910-464-6103

PENNSYLVANIA 2500

Moss Monroeville 15146 Tel: (412) 271·0724 TWX:

710·797·3650

1021

8th

Avenue

King

of

Prussia Industrial Park

King

of

Prussia 19406 Tel: (215) 265·7000 TWX:

510·660-2670

RHODE

ISLAND

873

Waterman East Providence 02914 Tel: (401) 434·5535 TWX:

710-381·7573

Side

Boulp-vard

Ave.

Road

TEXAS

P.O.

Box

1270

201E.Arapaho Tel: (214) 231·6101

TWX:

910·867-4723

6300 Westpark Drive Houston 77027 Tel: (713) 781·6000 TWX:

910·881·2645

231

Billy Mitchell S.n Antonio Tel: (512) 434-4171 TWX:

910-871·1170

UTAH 2890 South Main Street S.1t

like Tel: (801) 487·0715 TWX:

910·925·5681

VERMONT

P.O.

Box

2287 Kennedy Drive South Burlington 05401 Tel: (802) 658-4455 TWX:

710-658·4712

VIRGINIA

P.O.

Box

Road

6514

2Ul

Spencer

Richmond 23230 Tel: (703) 282·5451 TWX:

710·956·0157

WASHINGTON 433·108th

Bellevue 98004 Tel: (206) 454·3971 TWX:

910·443·2303

·WEST

VIRGINIA Charleston Tel: (304) 768·1232

FOR U.S. AREAS

LISTED: Contact the regional office near· est you: Atianta, Georgia North Hollywood, California Paramus,

New Illinois. Their complete dresses

are

·Service

Only

Rd.

78226

City 84115

(Feb.

Road

N.E.

Jersey

listed

Road

70)

NOT

above.

...

•..

...

Skokie,

ad·

CANADA

ALBERTA Hewlett·Packard 11745 Jasper Edmonton Tel: (403) 482·5561 TWX:

Ave.

610·831·2431

(Canada)

BRITISH

Ltd.

Hewlett·Packard

1037 West V.ncou"r Tel: (604) 731·5301

TWX:

COLUMBIA

BroadlYay

12

610·922·5059

(Canada)

Ltd.

CENTRAL AND SOUTH AMERICA

ARGENTINA Hewlelt·Packard Argentina S.A.C.e.1 Lavalle

1171·3> BuenOi Aires Tel: 35·0436, 35·0627, 35-0431 Telex: 012·1009

HEWPACKARG

C.ble: BRAZIL

Hewlelt·PackardDoBrasil l.e.C Ltda. Ru. Coronel:

Oscar

. 8,

HEWPACK

203 Janelre,

HEWPACK

Porto,

SP

Sao

ZC·39,

RiodeJaneiro

SIt

"110

Tel: 71·1503 Cable:

Hewlett·PackardDoBrasil l.e.C. Ltda. Avenlda Franklin Roosevelt 84· grupo

R'o

lit

Tel: 232·9733 C.ble:

691

Paulo

GB

CHILE

H~ctor

Calcagni y Cia, Ltda.

1394~

A.

Langebaek & Kier

No.

48·59

Aereo

6287

D.E.

AARIS

Bogota

RICA

GALGUR

S.n

Piso

Jos6

Bustos, 1932·3er Casllia S.ntl.go Tel: 4·2396

Cable: Calcagni Santiago COLOMBIA

Instrumentaclon Henrik

Ltda. Carrera 7 Apartado Bogota, 1 Tel: 45·78·06, 45·55·46 Cable: Telex: 044-400

COSTA

Lie.

Alfredo Gallegos Gurdljn

Apartado 3243

San

los6 Tel: 21·86·13 Cable:

MANITOBA Hewlelt·Packard 511 SI. J.mes Tel: (204) 786·7581 TWX:

ECUADOR Laboratorlos Calle Guayaquil Post Office Quito Tel: 12496 Cable:

EL Electr6nlca Apartado Postal 27

Avenida Norte SIn Tel: 25-74-50 Cable:

San

GUATEMALA

Olander Associates Latin America Apartado Postal Apartado Postal

Ruta4,6·53,

'u.tem.l. Tel: 63958 Cable:

Cable:

(Canada)

Bradford

CI.

610·671-3531

de

Radio·lngenieria

1246

Box

3199

HORVATH

Quito

SALVADOR

1589

1133

S.lv.dor

ElECTRONICA Salvador

1226

Zona

4

City Tel: 3451, 3452

OLALA

Guatemala City

NOVA

Ltd.

SCOTIA Hewlett·Packard 2745 Dutch Village Suite

203 H.llfax Tel: (902) 455-0511 TWX:

610·271-4482

JAMAICA General Engineering Services,

Ltd.

27

Dunrobln Kingston Tel: 42657 Cable:

GENSERV

MEXICO Hewlett·Packard Mexicana, de

C.V. Moras

439

Col. del Valle

12,

Mexico

Tel: 5·75-46-49 NICARAGUA

Roberto

Teran

. Edlflcio Teran

M.n.gu.

ROTE

D.F.

RAN

Ave.

G.

(Canada)

Rd.

689

Managua

ONTARIO

Ltd.

Hewlelt·Packard 880

Lady

Ellen ottawa 3 Tel: (613) 722·4223 TWX:

610-562-1952

Hewlett·Packard 50

Galaxy

Blvd. Rexd.le Tel: (416) 677-9611 TWX:

610-492·4246

PANAMA

Electr6nlca Balboa, P.O.

Box

4929

Ave.

Manuel Espinosa

Bldg. Alina

Panama

City Tel: 30833 Cable:

S.A.

ElECTRON

PERU

Ezeta

Fernando Avenlda Petit Thouars 4719 Mlraflores Casllia 3061

Lim.

Tel: 45·2335 Cable:

FE

PERU

PUERTO RICO San

Juan

Electronics, Inc.

P.O.

Box

5167 PoncedeLeon Pda_

3·pta.deTierra

Juan

00906

S.n Tel: (809) 725·3342

SATRONICS

Cable: Telex:

SATRON

(Canada)

Place

(Canada)

B.

Lima

154

3450

S.A.

No.

Panama

San

332

QUEBEC

Ltd.

Hewlelt·Packard 275

Hymus Pointe CI.lre Tel: (514) 697-4232

TWX:

610-422·3022

Telex: 01·20607

Ltd.

FOR

CANADIAN LISTED: Contact Hewlelt·Packard

ada)

the complete address listed

above.

URUGUAY Pablo

Comerclal e Industrial

13·50

Avenlda Italla 2877 Cas

iliadeCorrea 370 Montevideo Tel: 40·3102

City

Cable: VENEZUELA

Hewlett·PackardDeVenezuela C.A.

Apartado 50933

Caracas

Tel: 71.88.05, 71.88.69, 71.99.30

Cable: FOR AREAS

CONTACT:

Hewlett·Packard

INTERCONTINENTAL 3200 Hillview P.lo

Alto,

Tel: (415) 326·7000 TWX:

Juan

910·373·1267 Cable: Telex: 034-8461

(Canada)

S.A.

Montevideo

Caracas

NOT

Ave.

Palo

AREAS

LISTED,

Alto

Ltd.

NOT

(Can·

E

1/70

Boulevard

Ltd. In Pointe Claire, at

Ferrando

RADIUM

HEWPACK

California 94304

HEWPACK

Appendix

B

Model

427A

EUROPE

AUSTRIA Unllabor

GmbH Wissenschaftllche Inslrumente Rummelhardlgasse P.O.

Box Vienna A·I095 Tel:4261 Cable:

Vienna

Telex: 75 BELGIUM

Hewlett·Packard Benelux 348 Boulevard du Sauverain Brussels Tel:7222 Cable: Telex:23494

DENMARK Hewlett·Packard A/S Langebjerg 6 2850 Naerum

Tel: (01) 80 40

Cable: Telex: 66

FINLAND Hewlett·Packard Gyldenintle 3 Helsinki 20 Tel: 67 Cable: Telex: 12·1563

AFRICA,

ANGOLA

Telectra Empresa

de SAR

RuadeBarbosa Rodrigues Nicosia

42·1·

Box

6487 Luanda Cable:

AUSTRALIA Hewlett·Packard Australia

Pty. Ltd. 22·26 Weir Street Addis Glen

Iris, Victoria Tel: 20.1371 Cable: Telex: 31024

Hewlett-Packard Australia

Ply. Ltd.

61

Alexander Street Crows Nest 2065 New

Soulh Wales Tel: 43.7866 Cable: Telex: 21561

Hewlett-Packard Australia

Ply. Ltd.

97

Churchill Prospect 5082 South Australia Tel: 65.2366 Cable:

Hewlett Packard Australia

Ply. Ltd. Cable: 2nd Floor, Suite Casablanca Buildings 196

Adelaide Terrace

Perlh,

.W.A.

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Saigon

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Palo Alia

E 1170

Model

427A

'Ii

MANUAL

BACKDATING

CHANGES

Appendix

C

Instrument

731-

and

550 -

and

621-

and

below

0947A1l451

CHANGE 1

CHANGE 2

Serial

below

below below

This ments. yet

are

number

Prefix

manual

Page

Table7-1,

backdating

Instrument-component

not

listedinthe

giveninthe

Make

Change1thru

Change2thru Change3and Change 4

7-4:

ChangeJ1to ChangeS3to ChangeWIto Change

Change Add

MP12,

manual.

Manual

Replaceable

-hp-

MP3to-hp-

Replaceable

MP9,

front

bracket,

sheet backdating

Changes

4

Part Part

-hp-

Part

panel,to-hp-

MODEL

VOLTMETER

makes

this

values

sheet,

Parts

OPTION

No.

1251-0148.

No.

3101-0033.

No.

8120-0078.

No. 00427

Parts:

DC

ZERO/nooadjust,

427A

manual

that

Instrument

All

Part

applicabletoearlier

differ

from

shouldbereplaced

01:

-00203.

No.

-hp-

thoseinthe

using

Serial

Prefix

00427-00201.

Part

No.

instru-

manual,

the

part

Make

Change

00427-01201.

Manual

5

Changes

CHANGE 3

CHANGE 4

CHANGE 5

Schematic

Remove

Change

The

cover

Parts

for

MPl MP4 MP8 MPlO

Diagram

resistor

A2R17to2100-2069,R:varww1000

panels

blue

and

Replaceable

A1R22 (390n)from

A

Printed with addedincollector

Resistor power overload.

instruments

Cover: Cover: Cover: Meter

Circuit

revisioncor

A1R22

dissipation

and

trim

listedonPage7-4

top side bottom

trim

are

Parts:

NOTE

Board

beyond

circuit

was

addedtoreduce

in

A1Q4

listed

below.

5060-5918 5000-0702 5000-8569 5020-6852

collector

00427 -66501

has

A1R22

of A1Q4.

during

ohms±20%

are

of A1Q4.

for

brown

1-1/2 W.

instruments.

00427

-90005

HEWLETT~PACKARD

PRINTEDINU.S.A.

Hewlett Packard 427A User / service manual 3.4 MB)

Specifications and Main Features

Frequently Asked Questions

User Manual