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HP

437B

SERVICE

MANUAL

HP

437B

POWER

METER

POWER

REF

5.00mW

Sots

BORE

FUNCTION

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oy

lat

DATA

ENTRY

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EXCEED

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‘SOLN

CAL

FAC

ON/OFF

AUTORNG

SENSOR

PWR

REF

ext

beesaans

{

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i

et

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te

as

aaa

HP

Part

No.

00437-90016

E1088

HEWLETT

HP

Binder

Part

No.

9282-1077

GQ

PACKARD

aZer

dH

SERVICE

MANUAL

HP

437B

POWER

METER

SERIAL

NUMBERS

This

manual

applies

to

instruments

with

serial

numbers

prefixed

2801A

and

above.

For

additional

important

information

about

serial

numbers,

see

INSTRUMENTS

COVERED

BY

THIS

MANUAL

in

Section

1.

OD

|

HEWLETT

LE

PACKARD

©

Copyright

HEWLETT-PACKARD

COMPANY

1988

1501

PAGE

MILL

ROAD,

PALO

ALTO,

CALIFORNIA,

U.S.A.

SERVICE

MANUAL

PART

NO.

00437-90016

E1088

Microfiche

Service

Manual

Part

No.

00437-90018

Operating

Manual

Part

No.

00437-90015

Microfiche

Operating

Manual

Part

No.

00437-90017

Getting

Started

Guide

Part

No.

00437-90014

HP

437B

CERTIFICATION

Hewlett-Packard

Company

certifies

that

this

product

met

its

published

specifications

at

the

time

of

shipment

from

the

factory.

Hewlett-Packard

further

certifies

that

its

calibration

measurements

are

traceable

to

the

United

States

National

Bureau

of

Standards,

to

the

extent

allowed

by

the

Bureau’s

calibration

facility,

and

to

the

calibration

facilities

of

other

International

Standards

Organization

members.

WARRANTY

This

Hewlett-Packard

instrument

product

is

warranted

against

defects

in

material

and

workmanship

for

a

period

of

one

year

from

date

of

shipment.

During

the

warranty

period,

Hewlett-Packard

Company

will,

at

its

option,

either

repair

or

replace

products

which

prove

to

be

defective.

For

warranty

service

or

repair,

this

product

must

be

returned

to

a

service

facility

designated

by

HP.

Buyer

shall

prepay

shipping

charges

to

HP

and

HP

shall

pay

shipping

charges

to

return

the

product

to

Buyer.

However,

Buyer

shall

pay

all

ship-

ping

charges,

duties,

and

taxes

for

products

returned

to

HP

from

another

country.

HP

warrants

that

its

software

and

firmware

designated

by

HP

for

use

with

an

instrument

will

execute

its

programming

instructions

when

properly

installed

on

that

instrument.

HP

does

not

warrant

that

the

operation

of

the

instrument,

or

software,

or

firmware

will

be

uninterrupted

or

error

free.

LIMITATION

OF

WARRANTY

The

foregoing

warranty

shall

not

apply

to

defects

resulting

from

improper

or

inade-

quate

maintenance

by

Buyer,

Buyer-supplied

software

or

interfacing,

unauthorized

modification

or

misuse,

operation

outside

of

the

environmental

specifications

for

the

product,

or

improper

site

preparation

or

maintenance.

NO

OTHER

WARRANTY

IS

EXPRESSED

OR

IMPLIED.

HP

SPECIFICALLY

DISCLAIMS

THE

IMPLIED

WARRANTIES

OF

MERCHANTABILITY

AND

FITNESS

FOR

A

PARTICULAR

PURPOSE.

EXCLUSIVE

REMEDIES

THE

REMEDIES

PROVIDED

HEREIN

ARE

BUYER’S

SOLE

AND

EXCLUSIVE

REMEDIES.

HP

SHALL

NOT

BE

LIABLE

FOR

ANY

DIRECT,

INDIRECT,

SPE-

CIAL,

INCIDENTAL,

OR

CONSEQUENTIAL

DAMAGES,

WHETHER

BASED

ON

CONTRACT,

TORT,

OR

ANY

OTHER

LEGAL

THEORY.

ASSISTANCE

Product

maintenance

agreements

and

other

customer

assistance

agreements

are

available

for

Hewlett-Packard

products.

For

any

assistance,

contact

your

nearest

Hewlett-Packard

Sales

and

Service

Office.

Addresses

are

provided

at

the

back

of

this

manual.

WARRANTY

5

HP

437B

HP

437B

Herstellerbescheinigung

Hiermit

wird

bescheinigt,

dass

dieses

Gerit/System

in

Uber-

einstimmung

mit

den

Bestimmungen

von

Postverfiigung

1046/84

funkenstort

ist.

Der

Deutschen

Bundespost

wurde

das

Inverkehrbringen

dieses

Gerates/Systems

angezeigt

und

die

Berechtigung

zur

Uberpriifung

der

Serie

auf

Einhaltung

der

Bestimmungen

eingeraumt.

Zusatzinformation

fiir

Mess-

und

Testgeriite:

Werden

Mess-

und

Testgerite

mit

ungeschirmten

Kabeln

und/

oder

in

offenen

Messaufbauten

verwendet,

so

ist

vom

Betreiber

sicherzustellen,

dass

die

Funk-Entstérbestimmungen

unter

Be-

triebsbedingungen

an

seiner

Grundstiicksgrenze

eingehalten

werden.

Manufacturer’s

Declaration

This

is

to

certify

that

this

product

meets

the

radio

frequency

interference

requirements

of

Directive

FTZ

1046/1984.

The

German

Bundespost

has

been

notified

that

this

equipment

was

put

into

circulation

and

has

been

granted

the

right

to

check

the

product

type

for

compliance

with

these

requirements.

Note:

If

test

and

measurement

equipment

is

operated

with

unshielded

cables

and/or

used

for

measurements

on

open

set-ups,

the

user

must

ensure

that

under

these

operating

conditions,

the

radio

frequency

interference

limits

are

met

at

the

border

of

his

premises.

6

MANUFACTURER'S

DECLARATION

Warning

ip

Safety

Considerations

This

product

and

related

documentation

must

be

reviewed

for

familiarization

with

safety

markings

and

instructions

before

operation.

This

product

is

a

Safety

Class

I

instrument

(provided

with

a

protective

earth

terminal).

Before

Applying

Power

Verify

that

the

product

is

set

to

match

the

available

line

voltage

and

the

correct

fuse

is

installed.

Safety

Earth

Ground

An

uninterruptable

safety

earth

ground

must

be

provided

from

the

main

power

source

to

the

product

input

wiring

terminals,

power

cord,

or

supplied

power

cord

set.

Any

interruption

of

the

protective

(grounding)

conductor

(inside

or

outside

the

instrument)

or

disconnecting

the

protective

earth

terminal

will

cause

a

potential

shock

hazard

that

could

result

in

personal

injury.

(Grounding

one

conductor

of

a

two

conductor

outlet

is

not

sufficient

protection.)

In

addition,

verify

that

a

common

ground

exists

between

the

unit

under

test

and

this

instrument

prior

to

energizing

either

unit.

Whenever

it

is

likely

that

the

protection

has

been

impaired,

the

instrument

must

be

made

inoperative

and

be

secured

against

any

unintended

operation.

If

this

instrument

is

to

be

energized

via

an

autotransformer

(for

voltage

reduction)

make

sure

the

common

terminal

is

connected

to

neutral

(that

is,

the

grounded

side

of

the

mains

supply).

Servicing

instructions

are

for

use

by

service-trained

personnel

only.

To

avoid

dangerous

electric

shock,

do

not

perform

any

servicing

unless

qualified

to

do

sO.

Adjustments

described

in

the

manual

are

performed

with

power

supplied

to

the

instrument

while

protective

covers

are

removed.

Energy

available

at

many

points

may,

if

contacted,

result

in

personal

injury.

Capacitors

inside

the

instrument

may

still

be

charged

even

if

the

instrument

has

been

disconnected

from

its

source

of

supply.

SAFETY

CONSIDERATIONS

7

HP

437B

Warning

7

Caution

db

For

continued

protection

against

fire

hazard.

replace

the

line

fuse(s)

only

with

250V

fuse(s)

of

the

same

current

rating

and

type

(for

example,

nomial

biow,

time

delay,

etc.).

Do

not

use

repaired

fuses

or

short

circuited

fuseholders.

Safety

Symbols

symbol

when

it is

necessary

for

the

user

to

refer

to

the

instruction

manual

(see

Table

of

Contents

for

page

references).

(

Instruction

manual

symbol:

The

product

will

be

marked

with

this

5

Indicates

hazardous

voltages.

9

Indicates

earth

(ground)

terminal.

The

WARNING

sign

denotes

a

hazard.

It

calls

attention

to

a

procedure,

practice,

or

the

like,

which,

if

not

correctly

performed

or

adhered

to,

could

result

in

personal

injury.

Do

not

proceed

beyond

a

WARNING

sign

until

the

indicated

conditions

are

fully

understood

and

met.

The

CAUTION

sign

denotes

a

hazard.

It

calls

attention

to

an

operating

procedure,

practice,

or

the

like,

which,

if

not

correctly

performed

or

adhered

to,

could

result

in

damage

to

or

destruction

of

part

or

all

of

the

product.

Do

not

proceed

beyond

a

CAUTION

sign

until

the

indicated

conditions

are

fully

understood

and

met.

8

SAFETY

CONSIDERATIONS

@

ADJUSTMENTS

5-1.

Introduction

5-2.

Safety

Considerations

Warning

Va

5-3.

Equipment

Required

5-4.

Factory

Selected

Components

This

section

contains

adjustments

and

checks

that

ensure

proper

performance

of

the

Power

Meter.

Adjustments

are

not

required

on

any

fixed

periodic

basis,

and

normally

are

performed

only

after

a

performance

test

has

indicated

that

some

parameters

are

out

of

specification.

Performance

tests

should

be

completed

after

any

repairs

that

may

have

altered

the

characteristics

of

the

instrument.

The

test

results

will

make

it

possible

to

determine

whether

or

not

adjustments

are

required.

Allow

30

minutes

for

the

Power

Meter

to

warm

up,

and

then

remove

the

top

and

bottom

covers,

for

access

to

the

test

and

adjustment

points.

To

determine

which

performance

tests

and

adjustments

to

perform

after

a

repair,

refer

to

paragraph

5-5,

Post-Repair

Adjustments.

This

section

contains

a

warning

that

must

be

followed

for

your

protection

and

to

avoid

damage

to

the

equipment

being

used.

Adjustments

described

in

this

section

are

performed

with

power

applied

to

the

instrument

and

with

protective

covers

removed.

Maintenance

should

be

performed

only

by

trained

personnel

who

are

aware

of

the

hazards

involved.

When

the

maintenance

procedure

can

be

performed

without

power,

the

power

should

be

removed.

Most

of

the

adjustment

procedures

include

a

list

of

recommended

test

equipment.

The

test

equipment

is

also

identified

on

the

test

setup

diagrams.

If

substitutions

must

be

made,

the

equipment

used

must

meet

the

critical

specification

listed

in

Table

1-3

in

Section

I.

Factory

selected

components

are

identified

on

the

schematics

and

parts

lists

by

an

asterisk(*)

which

follows

the

reference

designator.

The

nominal

value

of

the

selected

component

is

shown.

Table

5-1

lists

the

reference

designator,

the

service

sheet

where

the

component

is

shown,

the

value

range,

and

the

basis

for

selecting

a

particular

value.

ADJUSTMENTS

5-1

HP

437B

Make

adjustments

only

in

the

order

specified.

Note

4%

5-5.

Post-Repair

Table

5-2

lists

the

adjustments

related

to

repairs

or

replacement

of

any

of

the

Adjustments

assemblies.

Table

5-1.

Factory

Selected

Components

Reference

Service

Range

of

Basis

of

Selection

Designator

Sheet

Values

A4R73

A4C

8252

1.

If

the

reference

power

is

outside

the

A4VR3

with

5.11V

range

of

1.000

+/-

0.007

mW

between

OC

and

5SC,

and

if

the

A4R73,

A4VR3

combination

is

825

Q

&

5.11V

then

change

the

A4R73,

A4VR3

combination

to

1470

2

&

8.25V.

However,

if

the

'

A4R73,

A41VR3

combination

is

already

1470

2

&

8.25V,

then

a

problem

exists

elsewhere.

Zener

or

1470

Q

with

8.25V

Zener

combination

Table

5-2.

Post-Repair

Adjustments,

Tests,

and

Checks

Assembly

Related

Adjustments

or

Reference

Repaired

Performance

Test

Service

Sheet

Al

Display

None

A3B

A2

Keyboard

None

A3B

A3

Central

Processing

Unit

4-7,

4-8

A3A-A3C

A4

Analog

Assembly

4-8, 4-9,

5-6, 5-7,

5-8,

5-9

A4A-A4C

(Includes

Ref

Oscillator)

50

MHz

Reference

Oscillator

4-10,

5-8,

5-9

A4C

(Part

of

Analog

Assembly)

5-2

ADJUSTMENTS

HP

437B

5-6.

220

Hz

Frequency

Adjustment

Reference

Description

Equipment

Procedure

Service

Sheet

A4C

The

220

Hz

is

adjusted

for

maximum

Power

Meter

readout.

RANGE

POWER

METER

CALIBRATOR

POWER

METER

Figure

5-1.

220

Hz

Frequency

Adjustment

Setup

Range

Calibrator

..........c.ccccececesceteceeeceseeceenenssnaeeeees

HP

11683A

1.

Turn

on

both

the

Power

Meter

and

the

range

calibrator.

Set

the

range

calibrator

controls

as

follows:

LINE:

eiceccded

ox

dh

eede

ve

bees

vee

ee

eednatntels

oeescu

dee

eve

eee

seed

ee

ees

nana

des

ON

RANGE

\0).0.55

cavgda

vob

ea

@iaks outer

ote

aicandie

eas

ae

Sadan

coaagaaassireces

1

mW

FUNCTION

(sie

cv

sess

cities

tales

tia

syrnie

Sands

ole

a

oye

bow

daly

Saree

eclp

tele

oe

STANDBY

POLAREDY

©

si

osc

seco

Resin

diioas

sieves

liot

ei

sed

oud

vadewsekewee

NORMAL

2.

Connect

the

range

calibrator

to

the

Power

Meter

as

shown

in

Figure

5-1.

3.

Press

the

PRESET/LOCAL

key,

then

the

ENTER

key.

ADJUSTMENTS

5-3

HP

437B

4.

Press

the

ZERO

key

on

the

Power

Meter,

and

allow

time

(5

to

15

seconds)

for the

Power

Meter

zeroing

routine

to

finish.

5.

Set

the

range

calibrator’s

FUNCTION

switch

to

CALIBRATE.

6.

Press

the

Power

Meter’s

CAL

(SHIFTed

ZERO)

key.

7.

Using

(2).

(+),

Co),

or

G2,

modify

the

REF

CF

to

read

100.0%.

8.

Press

the

ENTER

key.

9.

Adjust

A4R87

(FREQ)

for

the

maximum

front

panel

reading.

5-4

ADJUSTMENTS