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Figure

1.

Model 3529A

Magnetometer

Probe

SECTION

I

GENERAL

INFORMATION

1.

INTRODUCTION,

2.

The

Model

35294

Magnetometer

Probe

is

an

accessory

which

converts

the

Model

428A

or

Model

428B

into

a

magnetometer.

It

is

valuable

in

any

Table

1.

3529A

PROBE

application

where

a

magnetic

field

exists

and

an

accurate

determination

must

be

made

of

either

its

direction

or

its

magnitude.

Both

accurate

and

com-

.

pact

(the

probe

tip

is

only

1/4

in.

in

diameter),

it

is

useful

in

a

wide

range

of

applications,

such

as

meas-

uring

the

leakage

field

of

transformers,

etc.

3.

DESCRIPTION.

4.

The

accuracy

of

the

Model

3529A

is

better

than

+3%

£0.1

milligauss.

Its

bandwidth

is

from

dc

(non-

varying

fields)

to

80

cps,

allowing

it

to

be

used

in

the

measurement

of

ac

fields

associated

with

power-

line

frequencies.

9.

The

conversion

factor

of

the

Model

3529A

is

1

gauss

=

1

ampere,

that

is,

the

reading

from

the

Model

428A/B

in

amperes

is

directly

equal

to

the

measured

field

strength

in

gauss.

The

component

of

the

field

sensed

is

the

component

which

is

parallel

to

the

cylindrical

axis

of

the

probe,

allowing

the

user

to

eliminate

the

effects

of

extraneous

fields

(such

as

that

of

the

earth,

approximately

500

milli-

gauss)

by

orienting

the

probe.

Specifications

ACCURACY:

Probe

calibrated

to

specific

instrument:

+

3%

of

full

scale

from

0^

C

to

£55?

C

Probe

not

calibrated

to

specific

instrument:

+

5%

of

full

scale

from

0?

C

to

455^

C

RANGE

With

428A:

0.3

milligauss

to

1

gauss;

six

ranges

from

3

milligauss

to

1

gauss,

full

scale,

in

3,

10,

30....sequence

With

428B:

0.1

milligauss

to

10

gauss;

nine

ranges

from

1

milligauss

to

10

gauss,

full

scale,

in

1,

3,

10....sequence

CONVERSION

FACTOR:

OPERATING

TEMPERATURE

RANGE:

COMBINED

NOISE

AND

SHORT-

TERM

DRIFT:

OUTPUT

FREQUENCY

RANGE,

MODEL

428B

EQUIPPED

WITH

MODEL

3529A:

.

STORAGE

RANGE:

DIMENSIONS:

-20°

C

to

«55^

C

Typically

less

than

£0.

1

miligauss,

peak

DC

to

80

cps

(3

db

point)

-40°

C

to

65^

C

1

milligauss/milliampere

(1

Gauss/amp)

3-11/16

in,

by

7/16

in.

diameter,

maximum;

cable:

7

feet

long

01364-2

3529-901

MAGNETOMETER

Page

2

6.

CALIBRATION,

7.

CHECK

THE

STRENGTH

OF

THE

EARTH'S

MAGNETIC

FIELD

AS

SOON

AS

YOU

RECEIVE

THIS

INSTRUMENT.

USE

THIS

READING

AS

A

REFER-

ENCE

FOR

FUTURE

CALIBRATION.

To

measure

the

earth's

field

in

your

locality

proceed

as

follows:

a,

The

location

for

taking

the

reading

is

important

and

should

be

selected

with

care,

taking

the

following

into

consideration:

(1)

Since

the

reading

is

to

be

the

reference

for

instrument

calibration,

choose

a

place

that

will

always

be

accessible.

(2)

Since

the

presence

of

strong

ac

fields

will

affect

the

reading,

choose

a

location

free

of

power-line

pickup.

(3)

Since

the

presence

of

magnetic

materials

also

wili

affect

the

reading,

choose

a

location

which

either

is

free

of

magnetic

material

such

as

steel

workbenches

and

beams

or

is

one

in

whieh

such

material

will

not

be

added,

taken

away,

or

moved

around.

b.

Plug

Model

3529A

into

Model

428A/B,

and

turn

Model

428

ON,

and

allow

15

minutes

to

warm-up.

c.

Turn

Model

428

OFF

for

30

seconds,

and

then

mechanicall

zero-set

meter

(see

Section

IV

for

details).

d.

Before

any

measurements

are

taken,

the

electri-

cai

ZERO

adjustment

must

be

centered.

Turn

red

ZERO

VERNIER

control

knob

fully

clockwise

and

mechanically

center

the

large

black

ZERO

control

knob,

This

action

will

set

the

instrument

zero

to

within

+3

milligauss

of

zero

field.

As

the

earth’s

field

is

approximately

500

milligauss,

less

than

1%

error

will

be

introduced.

If

care

is

taken

when

mechanically

setting

the

ZERO

control,

repeatable

readings

within

0.5

milligauss

should

be

obtained.

For

greater

ease

in

returning

to

this

setting

make

a

mark

on

the

knob

and

on

the

panel

adjacent

to

the

knob

with

a

lead

pencil.

e.

Point

tip

of

probe

toward

the

south

and

up

(toward

the

south

and

down

in

Southern

Hemisphere).

Extend

probe

at

full

cable

length

from

instrument

to

reduce

disturbance

from

any

fields

around

instrument.

Carefully

orient

probe

for

maximum

reading.

(See

paragraphs

9

and

10.)

f.

Record

the

value

of

the

maximum

reading.

This

is

the

value

to

use

as

a

reference

for

future

cal-

ibration.

The

earth's

magnetic

field

does

vary

slightly

but

not

enough

to

be

detectable

on

the

1

AMP

range.

When

recalibrating

the

instrument

be

sure

to

take

the

measurement

at

the

same

location,

and

be

sure

that

there

has

been

no

change

in

the

magnetic

environment

(i.e.,

no

new

steel

objects,

etc).

Any

ac

fields

in

the

vicinity

when

making

this

measurement

,

Should

not

exceed

0.1

gauss

peak.

Model

3529A

SECTION

II

OPERATION

8.

INTRODUCTION,

9.

The

Model

3529A

measures

the

component

of

the

magnetic

field

which

is

parallel

to

the

axis

of

the

probe.

When

the

meter

reads

up-scale

the

tip

of

the

probe

points

toward

a

north

magnetic

pole

(opposite

to

the

direction

of

the

magnetic

flux).

To

measure

the

earth's

magnetic

field

start

with

the

tip

of

the

probe

pointed

up

(down

in

the

Southern

Hemisphere)

and

toward

the

south

(note

that

the

south

geographical

is

a

north

magnetic

pole).

10.

A

true

reading

of

the

ambient

value

ofthe

earth’s

magnetic

field

will

be

obtained

only

when

all

ferro-

magnetic

materials

(magnitized

or

not)

are

kept

well

away from

the

probe

head.

If

the

probe

is

held

by

a

fixture

be

sure

all

of

the

materials

of

the

fixture

are

non-magnetic

and

clamp

the

handle,

notthe

probe-tip.

When

measurements

must

be

taken

in

a

building

with

a

Steel

framework

keep

as

far

away

from

steel

beams

and

steel-reinforced

walls

or

floors

as

possible.

1l.

MEASURING

STEADY

MAGNETIC

FIELDS.

12.

The

earth's

magnetic

field

is

usually

a

problem

when

endeavoring

to

make

anaccurate

measurement

of

steady

magnetic

fields.

If

the

field

to

be

measured

can

be

turned

off,

the

probe

may

then

be

oriented

to

give

a

zero

reading

on

the

meter.

When

the

field

to

be

measured

is

turned

on

the

probe

will

indicate

the

component

of

the

field

in

the

direction

of

the

probe.

If

this

is

the

direction

in

which

it

is

desired

to

measure,

or

if

merely

maximizing

the

field

is

desired,

this

procedure

is

satisfactory.

However,

if

the

field

must

be

measured

in

some

other

direction,

other

techniques

must

be

used

(see

following

paragraphs).

13.

The

earth’s

magnetic

field

can

be

cancelled

out

at

the

point

of

measurement

by

building

a

pair

of

Helmholtz

coils

around

the

probe.

Orient

the

coil

axis

parallel

to

the

earth’s

field

and

run

current

through

the

Helmholtz

coils

in

the

proper

direction

and

magnitude

to

zero

the

meter.

Then

insert

the

'

field

to

be

measured

and

measure

in

the

normal

way.

The

reading

of

the

meter

in

this

case

will

be

only

the

desired

field.

14.

If

the

field

to

be

measured

cannot

be

turned

off,

other

techniques

must

be

used.

If

the

device

generat-

ing

the

field

can

be

oriented,set

the

device

to

a

position

where

you

can

get

maximum

reading.

Record

the

reading

and

then

rotate

the

device

about

an

axis

on

a

lne

between

the

object

and

the

probe.

Rotate

for

minimum

reading

on

the

meter,

and

record

this

reading.

The

component

of

the

field

from

the

device

in

the

direction

of

the

probe

axis

is

one-half

of

the

difference

between

the

maximum

and

minimum

read-

ings.

The

external

field

of

a

magnet

may

be

measured

by

this

method,

.

.

01364-2

Model

3529A

15.

MEASUREMENTS

OF

ALTERNATING

FIELDS.

16.

Measurements

of

alternating

fields

can

be

per-

formed

only

by

measuring

the

output

of

the

front-

panel

OUTPUT

jack

with

an

ac

voltmeter

or

an

oscilloscope

since

the

meter

on

the

instrument

reads

only

the

steady-state

value

of

the

magnetic

field.

The

OUTPUT

jack

is

a

de

coupled

output

that

gives

one

volt

for

a

full-scale

reading

of

the

field

as

selected

by

the

RANGE

switch.

CAUTION

-.

The

signal

resulting

from

the

steady-state

value

of

the

magnetic

field

plus

the

peak

value

of

the

ac

field

must

not

overdrive

the

ampli-

fliers

in

the

instrument.

To

check

the

steady

field

condition,

observe

the

meter;

if

the

needle

is

offscale

the

amplifier

may

be

overdriven.

To

check

the

ac

pick-up,

con-

nect

an

oscilloscope

to

the

front

panel

OUT-

PUT

jack

and

observe

the

waveform

for

clipping.

1f

either

condition

is

observed,

the

amplifier

is

saturating

and

the

instrument

must

be

switched

to

a

higher

range

to

give

a

true

reading.

Because

of

the

magnitude

of

the

earth’s

field,

generally

ac

measurements

must

be

made

onthe

1

AMP

or

greater

range.

SECTION

HI

PRINCIPLES

OF

OPERATION

17.

DESCRIPTION.

18.

The

Model

35294A

is

a

flux-gate

type

magnetometer

which

operates

in

the

same

manner

as

the

standard

probe

used

with

the

Model

428A/B.

Refer

to

Section

HI

of

the

Operating

and

Service

Manual

for

the

Model

428A/B

for

a

discussion

of

the

flux-gate

principle.

SECTION

IV

MAINTENANCE

19.

INTRODUCTION,

20.

INSTRUMENT.

Maintenance

of

the

Model

428A/B

milliammeter

is

the

same

whether

the

probe

used

is

the

Current

Probe

Assembly

(428A-21A)

orthe

Model

3529A

Magnetometer

Probe.

Maintenance

of

the

Model

428A/B

is

discussed

in

the

Model

428A

and

428B

Operating

and

Service

Manuais,

Where

differ-

ences

between

the

Current

Probe

Assembly

and

the

Model

3529A

make

it

necessary

to

modify

the

trouble-

Shooting

techniques

given

in

the

manual,

such

modif-

ication

is

discussed

below

under

troubleshooting.

21.

PROBE,

The

Model

3529A

is

a

simple

device,

consisting

of

two

drive

coils,

wound

around

forms

containing

core

material,

and

an

output

coil

wound

around

both

drive

coils.

In

general,

probably

the

only

troubleshooting

technique

that

will

be

required

is

the

ohmmeter

check

described

in

paragraph

27,

01364-2

Page

3

22.

MECHANICAL

ZERO-SET.

23,

When

the

meter

is

properly

zero-set

the

pointer

rests

over

the

zero

calibration

mark

on

the

meter

Scale

when

the

instrument

is

(1)

at

normal

operating

temperature,

(2)

in

its

normal

operating

position,

and

(3)

turned

off.

Zero-set

as

follows

to

obtain

best

accuracy

and

mechanical

stability:

a.

Allow

instrument

to

operate

for

at

least

20

minutes;

this

allows

meter

movement

to

reachnormal

operating

temperature.

b.

Turn

instrument

OFF

and

allow

30

seconds

for

all

capacitors

to

discharge.

c,

Rotate

mechanical

zero-adjustment

screw

clock-

wise

until

meter

pointer

is to

left

of

zero

and

moving

upscale

toward

zero.

d.

Continue

to

rotate

adjustment

screw

clockwise;

stop

when

pointer

is

right

on

zero.

If

pointer

over-

shoots

zero,

repeat

steps

c

and

d.

e.

When

pointer

is

exactiy

on

zero,

rotate

adjust-

ment

screw

approximately

15

degrees

counterclock-

wise.

This

is

enough

to

free

adjustment

screw

from

the

meter

suspension.

If

pointer

moves

during

the

Step

you

must

repeat

steps

c

through

e.

24.

TROUBLESHOOTING.

25,

If

you

have

another

Model

3529A

Magnetometer

Probe

or

another

type

of

probe

such

as

the

428A-21A

Current

Probe

Assembly

or

the

large

aperature

Model

3529A

probe,

isolate

the

trouble

to

either

the

instrument

proper

or

to

the

probe,

by

substitution.

If

the

trouble

is

in

the

instrument

follow

the

trouble-

Shooting

procedure

given

in

paragraph

29.

If

the

trouble

appears

to

be

in

the

probe

see

the

next

paragraph.

26.

PROBE.

27.

If

the

trouble

appears

to

be

in

the

probe,

discon-

nect

the

probe

from

the

Model

428A/B,

and

measure

the

resistance

across

each

of

the

two

windings.

Only

a

few

ohms

should

be

measured

across

either

winding

1-2

or

winding

3-4

(terminalnumbers

appear

adjacent

to

the

pins,

on

the

face

of

the

probe

connector).

There

shouid

be

no

conductivity

between

winding

1-2

and

winding

3-4,

a.

If

an

examination

of

the

connector

indicates

the

connector

is

defective,

note

how

the

wires

are

con-

nected,

and

then

replace

the

connector.

This

con-

nector

is

identical

to

the

one

used

onthe

Model

428A/B.

b.

If

the

wires

inside

the

probe

or

cable

are

de-

fective,

probably

the

entire

assembiy

will

have

to

be

repaced

as

the

inside

of

the

probe

is

filled

with

Silastic

compound

to

protect

the

leads

from

mechanical

damage.

28.

MILLIAMMETER,

29.

In

general,

instrument

troubleshooting

and

main-

tenance

techniques

are

the

same

whether

the

probe

used

in

the

428A-21A

current

probe

or

the

Model

3529A

magnetometer

probe.

However,

wherever

the

Page

4

technique

requires

current

through

the

probe,

procedures

given

in

the

Model

428A/B

manuals

will

require

some

modification.

Such

modifications

are

discussed

in

the

following

paragraphs.

30,

CALIBRATION,

Instead

of

the

accuracy

check

procedures

given

in

the

manuals

(Model

428A,

par.

4-6A,

and/or

step

23,

table

4-2;

Model

428B,

par.

9-39,

and/or

step

24,

table

5-2),

check

instrument

calibration

by

re-measuring

the

earth’s

magnetic

field

strength,

and

comparing

the

reading

obtained

with

the

reference

reading

made

as

instructed

in

paragraph

6.

If

the

readings

are

not

the

same,

follow

the

adjustment

procedure

given

in

the

instru-

ment

manual.

31.

SIGNAL

SOURCE.

Some

of

the

techniques

des-

cribed

in

the

paragraphs

listed

below

require

that

there

be

an

input

signal.

A

suitable

ac

input

may

be

obtained

by

placing

the

magnetometer

probe

near

a

power-supply

transformer.

With

such

an

input,

the

following

procedures

can

be

used.

a.

Troubleshooting.

Waveforms

can

be

used

as

describe

in

(1)

Model

428A,

par.

4-8A

(2)

Model

428B,

par.

5-29,

5-30

b.

Adjustments.

(1)

Model

428A,

table

4-2,

steps

9

through

13

(2

Model

428B,

table

5-2,

steps

8

throught

12

32.

LOOP

GAIN

CHECK.

To

measure

the

gain

of

the

amplifier,

proceed

as

follows:

a.

Model

428B.

See

step

18,

table

5-2.

Model 3529A

(1)

Obtain

a

signal

as

follows:

winda5-

to

50-turn

coil

around

the

magnetometer

probe

head,

and

couple

the

coil

to

an

oscillator

which

furnishes

Signals

in

the

20

eps

to

8--cps

range,

such

as

the

@

Model

200CD.

Set

the

audio

oscillator

for

20

eps.

(2)

Proceed

as

described

in

step

18 of

table

5-2

except

for

setting

the

0

db

point

on

20

cps

(instead

of

50).

b.

Model

428A.

Since

the

Model

428A

does

not

have

an

ac

output,

the

procedure

is

somewhat

more

complieated

than

that

specified

for

the

Model

428B;

measuring

the

true

gain

of

the

amplifier

involves

disconnecting

the

feedback

loop.

Proceed

as

follows:

(1)

Follow

the

instructions

given

in

step

14,

table

4-2,

of

the

Model

428A

manual

through

zero-

setting

the

meter.

(2)

Wind

a

5-

to

10-turn

coil

around

the

magneto-

meter

probe

head,

(3

Feed

enough

direct

current

of

the

proper

polarity

through

the

coil

togivea

3

ma.

reading

on

the

Model

428A

meter.

Then

turn

off

this

current

until

step

5.

(4)

Disconnect

the

jumper

across

the

Test

Dis-

connect

terminals

on

terminal

board

428A

-

75A

(board

nearest

front

panel);

this

jumper

will

be

found

across

the

terminals

nearest

the

front

panel.

Removing

the

jumper

disconnects

the

feedback

loop.

(5)

Turn

instrument

on,

and

rezero.

Turn

on

Same

current

as

applied

in

step

3;

meter

Should

now

read

approximatley

60

to

90

ma.

If

meter

reads

less,

amplifier

may

have

deteri-

orated.

Proceed

as

described

in

step

14,

table

4-2.

01364-2

HEWLETT-PACKARD

SALES

AND

SERVICE

OFFICES

IN

NORTH

AMERICA

+

Cleveland,

Okio

44129

Crossisy

Associates,

inc,

5579

Pearl

Road

{216}

884-9209

Hewlett-Packard

Company

800

Linden

Avenue

(716)

38-4120

+

Detroit,

Mich.

48235

Crossley

Associates,

lnc.

14425

West

Eight

Mile

Road

(313)

342-5700

+

PITTSBURGH

AREA

Crossley

Associates,

inc.

2545

Moss

Side

Blvd.

Monroeville,

Pa.

15145

(412)

2705227

+

Dayton,

Ohio

45409

Crossley

Associates,

Inc.

1250

W.

Dorothy

Lane

(513)

299.3594

+

dndicnopolis,

ind,

46205

Crossley

Associates,

inc.

3917

Meadows

Dr.

(317)

548-4894

Camp

Hil,

Pa.

Robinson

Sales

Division

Hewlett-Packard

Company

(717)

737-6791

+

Seattle,

Wash,

98109

ARYA,

lac.

1320

Prospect

Street

{206}

622-0177

Salt

Loke

City.

Utah

84115

Lahana

&

Co.

1482

Major

St.

(801)

486-8166

-+

Sacramento,

Calif.

95821

Neely

Enterprises

2591

Carlsbad

Ave.

(915)

482-1463

"^

SAN

FRANCISCO

AREA

VE

Neely

Enterprises

50i

Laure!

Street

San

Carlos,

Calif.

94071

(415)

591-764

+

LOS

ANGELES

AREA

Neely

Enterprises

3939

Lankershim

Blvd...

.

North

Hollywood,

Calif.

94604

(213)

877-1282

and

766-38li

+

Son

Diego,

Calif.

92105

Neely

Enterprises

1055

Shafter

Street

(744)

223-8103

—

“+

Scottsdale,

Ariz.

85251

Naely

Enterprises

3009

No.

Scottsdale

Rd.

(802)

945.7401

-+

Albuquerque,

N,

M.

87108

Neely

Enterprises

.

6501:

Lomas

Bivd.,

N.

E.

(505)

255-5586

Tucson,

Ariz.

85716

Neely

Enterprises

232

So.

Tucson

Blvd.

(602)

623-2564

Las

Cruces,

N.

M.

88001

Neely

Enterprises

114

S,

Water

Street

(505)

526-2486

-+

Rochester,

N.

Y.

14625

+

Syracuse,

N.

Y.

13211

Hewlett-Packard

Company

Pickard

Building

Molloy

Rd.

and

Pickard

Dr.

(315)

454-2485

Richmond,

Va.

23230

Bivins

&

Caldwell,

Inc.

2112

Spencer

Road

(703)

282-5451

+

Denver,

Colo.

80222

Lahana

&

Company

P.O.

Box

22055

Belleview

Valley

Hy.

interchange

{303}

755.1233

+

Dallas,

Texas

75209

Hewlett-Packard

Co.

P.O.

Box

7166

3405

inwood

Road

(214)

357-188]

and

332-6667

4-

Poughkeepsie,

N,

Y.

1268)

+

BOSTON

AREA

Hewlett-Packard

Company

Yeweil

Associates,

Inc.

82

Washington

St.

Middlesex

Turnpike

(914)

454-7330

Burlington,

Mass.

01804

(617)

272-9000

+

Middletown,

Conn.

06458

i

Yewell

Associates,

inc.

589

Saybrook

Rd.

(203)

446-6611

+

New

York,

N.

Y.

10021

RMC

Sales

Division

Hewlett-Packard

Company

234

East

75th

Street

(212)

879-2023

Englewood,

N.

J.

07631

RMC

Sales

Division

Hewlett-Packard

Company

391

Grand

Avenue

(201)

567-3933

ASBURY

PARK

AREA

Robinson

Sales

Division

Hewlett-Packard

Company

Shrewsbury,

New

Jersey

(201)

747-1060

^^

PHILADELPHIA

AREA

Robinson

Sales

Division

Hewlett-Packard

Company

144

Elizabeth

Street

West

Conshohocken,

Pa.

19428

{215}

248.1600

and

828-6200

Baltimore,

Md.

21215

Horman

Associates,

Inc.

3006

West

Cold

Spring

Lane

(301)

664-4400

+

WASHINGTON,

D.

C.

AREA

Hormen

Associates,

inc.

94!

Rollins

Avenue

Rockville,

Md.

20852

(300)

427-7560

+

Montreal,

Quebec

Hewlett-Packard

{Canada}

Ltd.

8270

Mayrand

Street

(514)

735-2273

Kansas

City,

Mo.

64131

Harris

Hanson

Company

7316

Paseo

Street

(816)

444-9494

+-

St.

Paul,

Minn.

55114

Crossley

Associates,

Inc.

842

Raymond

Avenue

(612)

646-7881

Ottawa,

Ontario

.

Hewlett-Packard

(Canada)

Ltd.

1762

Carling

Avenue

(513)

722-8142

.

Toronto,

Ontario

Hewlett-Packard

{Canada}

Ltd.

1415

Lawrence

Avenue

W

{418}

249-9196

+

Chicago.

iij,

60645

Crossley

Associates,

Inc.

25001

West

Peterson

Ave.

(312)

275-1500

+

St.

Louis,

Mo.

63144

Harris-Hanson

Company

2814

South

Brentwood

Blvd.

(314)

647-4350

+

High

Point,

N.

C.

27262

Bivins

&

Caldwell,

inc,

1923

N,

Main

Street

(919)

882.5873

+

Aflente,

Gc.

30305

Bivins

&

Caldweil,

Inc.

3110

Maple

Drive,

N.

E.

(404)

233-ii4I

+

Oriando,

Fla.

32803

Stiles

Sales

Division

Hewlett-Packard

Company

62)

Commonwealth

Ave,

(305)

425-554)

St.

Petersburg,

Fia.

33708

Stiles

Sales

Division

Howilett-Packard

Company

4i0-i50th

Ave.,

Madeira

Beach

(813)

391.0211

Huntsville,

Atc.

35801

Bivins

&

Caldwell,

Inc.

Holiday

Office

Center

Suite

No.

?

(205)

881-4551

+

Houstos,

Texas

77027

Hewlett-Packard

Co.

P.O.

Box

22813

4242

Richmond

Ave.

(713)

867-2407

A

For

replacement

parts

and

repair

services

ja

the

San

Francisco

area,

please

contact

Hewlett-Packard

Company,

395

Page

Mill

Road,

Palo

Alto,

California,

Tei:

(415)

326-3950.

-+

indicates

Instrument

Repair

Stations.

HEWLETT-PACKARD

COMPANY

1501

Page

Mill

Road

*

Palo

Alto,

California

94304

Tel:

(415)

326-7000

-

TWX:

415-492-9200

*

Cable:

HEWPACK

DYMEC

DIVISION

395

Page

Mill

Road

*

Palo

Alto,

California

94306

Tel:

(415)

326-1755

-

TWX:

415-492-9363

BOONTON

RADIO

COMPANY

Green

Pond Road

*

Rockaway,

New

Jersey

07866

Tei:

(201)

627-6400

+

Cable:

BOONRACO

HARRISON

LABORATORIES

41

industrial

Road

+

Berkeley

Heights,

N.

J.

07922

Tel:

(201)

464-1234

«TWX:

Summit,

N,

J.

SANBORN

COMPANY

175

Wyman

St.,

Waltham,

Mass.

02154

Tel:

(617)

894-6300

*

TWX:

617-894-0789

F. L.

MOSELEY

CO.

409

N.

Fair

Oaks

Ave.

+

Pasadena,

Calif.

91102

*

Tel:

(213)

681-0208

»

TWX:

PASA

CAL

7687

*

Cable:

MOCOPAS

MARCH

64

003905

®

WARRANTY

All

our

products

are

warranted

against

defects

in

materials

and

workmanship

for

one

year

from

the

date

of

shipment.

Our

obligation

is

limited

to

repairing

or

replacing

products

(except

tubes)

which

prove

to

be

defective

during

the

warranty

period,

We

are

not

liable

for

consequential

damages.

For

assistance

of

any

kind,

including

help

with

instruments

under

warranty,

contact

your

nearest

Hewlett-

Packard

field

office

for

instructions.

Give

full

details

of

the

difficulty

and

include

the

instrument

model

and

serial

numbers.

Service

data

or

shipping

instructions

will

be

promptly

sent

to

you.

There

will

be

no

charge

for

repair

of

instruments

under

warranty,

except

transportation

charges.

Estimates

of

charges

for

non-warranty

or

other

service

work

will

always

be

supplied,

if

requested,

before

work

begins.

CLAIM

FOR

DAMAGE

IN

SHIPMENT

Your

instrument

should

be

inspected

and

tested

as

soon

as

it

is

received.

The

instrument

is

insured

for

safe

delivery.

If

the

instrument

is

damaged

in

any

way

or

fails

to

operate

properly,

file

a

claim

with

the

carrier

or,

if

insured

separately,

with

the

insurance

company.

SHIPPING

On

receipt

of

shipping

instructions,

forward

the

instrument

prepaid

to

the

destination

indicated.

You

may

use

the

original

shipping

carton

or

any

strong

container.

Wrap

the

instrument

in

heavy

paper

or

a

plastic

bag

and

surround

it

with

three

or

four

inches

of

shock-absorbing

material

to

cushion

it

firmly

and

prevent

movement

inside

the

container.

GENERAL

Your

nearest

Hewlett-Packard

field

office

is

ready

to

assist

you

in

any

situation,

and

you

are

always

wel-

come

to

get

directly

in

touch

with

Hewlett-Packard

service

departments:

CUSTOMER

SERVICE

OR

(in

Western

Europe)

Hewlett-Packard

Company

Hewlett-Packard

S.A.

395

Page

Mill

Road

54

Route

Des

Acacias

Palo

Alto,

California,

94306

Geneva,

Switzerland

U.S.A.

Telephone:

(022)

42. 81.

50

Telephone:

(415)

326-3950

Cable:

"HEWPACKSA"

TWX

No.

(415)

492-9363

Cable:

"HEWPACK"

"e