Hp 654a Service manual

Fli;'

HEWLETT

.:e.

PACKARD

OPERATING

AND

SERVICE

MANUAL

MODEL

654A

TEST

OSCILLATOR

The

main

bod

y

of

this

manual

appli

es

to

Seria l Pre fix

0951

A

Any

changes

made

in

instruments

manufactured

after

this

printing

w i

ll

be

found

in

a

"Manual

Chan

g

es

"

supplem

e

nt

supplied

with

this

manual

. Be

su

re

to

ex

amine

this

s

upplement,

if

one

ex

ist

s

for

thi

s

manual,

fo

r

any

changes

which

apply

to

your

instrum

e

nt

and

record

these changes

in

the

manual.

Backdating

information

for

in

st

rum

e

n~s

ma

n

ufactured

before

thi

s

printing

will

be

found

in

Appendix

C

for

in s

trume

nt Serial

Numbers

0951

A02260

and b e

low

.

WARNING

I

To

help

minimize

the

possibility

of

electrical

fire

or

shock

hazards,

do

not

expose

this

instrument

to

rain

or

excess

moisture.

·hp- Part No. 00654-90003

Microfiche Part No. 00654-90053

Company

1969

P .O. Box

30),

Loveland ,

Colorado

80537

U.S.A.

Printed: October 1975

FliO'l

HEWLETT

~-------------------~~

PACKARO

CERTIFICA

TlON

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

Na-

tional 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

product

is

warranted

against defects in material

and

workmanship

for a period

of

one

year

from

date

of

shipment [,except that in the case

of

certain

components

listed in Section I

of

this

manual,

the

warranty

shall be for the specified period) .

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 shipping charges, duties,

and

taxes for

products

returned

to

-hp-

from

another

country.

Hewlett-Packard

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.

Hewlett-Packard

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

shaH not

apply

to

defects resulting

from

improper

or

inadequate

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.

HEWLETT-PACKARD

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.

HEWLETT-

PACKARD

SHALL

NOT

BE

LIABLE

FOR

ANY

DIRECT,

INDIRECT,

SPECIAL,

INCIDENTAL,

OR

CONSE-

QUENTIAL

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.

10/1/79

Model 654A

Table

of

Contents

TABLE

OF

CONTENTS

Section

Page

Section

Page

I. GENERAL INFORMATION

....

. . .

...

..

.

1-1

5-36. Hum and Noise Check

..

...

..

... ...

5-10

1-1.

Description......

...

....

.

.....

.

1-1

5-37 . Counter Output Check

..

. .

..

.

.....

5-11

1-7

. Supplied Accessories . . . . . . . . . . . .

..

1-1

5-38. Adjustment Procedure

...

..

.

.....

. . 5-12

1-8

. Recommended Accessories. . . . . . . . . . I-I

540.

Calibration Procedure

...

.. ..

. .

....

. 5 -12

1-9.

Instrument and Manual Identification

...

I-I

542.

Turn-On

..

.

.............

.

...

.5-13

545.

Power Supply Voltage Adjustments

...

5-13

Section

Page

546

. Power Supply Regulation and

11.

INSTALLATION 5-13

Zero Adju stment.

........

..

.. ..

3-1

5-88 . Trouble Isolation

in

the Remainder

Section

Page

5-95. Troubleshooting the Meter

.....

..

....

..

.....

. . .

2-1

Ripple Check

..

.

...

.

..

....

. .

2-1. Introduction 5-13

...

.

......

.

.........

2-1

547

. Frequency Calibration Procedures

..

2-3.

Initial Inspection

..............

.

..

2-1

5-58 . Meter Tracking and Amplitude

2-5. Power Requirements

...

.

..........

2-1

Control Adjustments .

...

.. ..

...

.5-16

2-9

. Ground i

ng

Requirements . .

....

. . .

..

2-1

5-61. Amplitude Accuracy Calibration .

..

5-17

2-11. Installation 5-18

...

... ...

...

....

..

.

..

2-1

5-62. Balance Adjustments

.......

.

.....

2-13. Rack/Bench Installation .

....

...

.. ..

2-1

5-65

.

Level

Flatness Adjustments .

...

.....

5-18

1-15. Repackaging for

Shipment.

. . . . . .

..

2-1

5-70. Troubleshooting the 654A

..

......

..

5-19

5-74. Front Panel Checks .

......

.

......

5-19

Section

Pa

ge 5-75. Troubleshooting Tree

..

.

.......

. . 5-19

Ill. OPERATING INSTRUCTIONS. . . . . . . . . .

3-1

5-78 . Troubleshooting the Power Supply

....

5-22

3-1. Introduction

5

-22

....................

3-1

5-81. Troubleshooting the Oscillator Circuit

.

3-3

. Control

s,

Indicators,

and

Connectors 5-23

....

3-1

5-84. Troubleshooting the Buffer Amplifier

..

3-5. Turn-On Proced ure . . . . . . . . . . . . . . .

3-

I 5-86. Troubleshooting the Balanced

3-6. Output Meter Mechanical Amplifier.

..

....... .......

...

5-23

3-8. Primary Power Application

..

...

.

...

3-1

of

the Leveling Loop

...

.

..

.

..

...

5-23

3-9. Operating Instructions

....

.

.....

...

3-1

5-91. Troubleshooting the Amplitude

3·

10.

Operating Check

.. ..

......

.

......

3-1

Control Integrator

..

...

......

...

5-24

5-93. Troubleshooting the A

LC

Loop

..

...

. 5

-24

IV.

THEORY OF OPERATION 5-24

......

.

.......

4-1

Differential Amplifier

..

.

.....

..

.

4-1. General Description

............

..

.

4-1

5-97. Troubleshooting the Attenuators

.....

5-24

4-6

. Circuit Description . . . .

...

. .

..

. . . .

4-1

5-99. Servicing Etched Circuit Boards

..

. .

..

5-24

4-7. Oscillator

Circuit.

. . . . . . . . . .

4-1

5-101. Servicing Rotary Switches .

.....

..

.5-25

4-11

. Buffer Amplifier

...

..

...........

4-2 5-103 . Servicing Tuner

Ass

embly . .

..

.

.....

5

-25

4-13. Counter Emitter Follower

..

.

......

4-2

4·15 . Balanced Amplifier

..............

4-2 Section

Pa

ge

4-19 . Amplitude Control and Automatic

VI

REPLACEABLE PARTS

....

... ...

..

....

6-1

Leveling Con trol

........

.

..

....

4-3 6-1. Introduction

..

....

...

.

...

.

...

6-1

4-29. Meter Circuits . . . . . . . . .

44

64.

Ordering Information

...

.

...

.

....

..

6-1

4-33. Attenuators

..

. . . . .

..

.

..

.

.. ..

4-4 6-6. Non-Listed Parts

....

..

...

.

.......

6- 1

4-35. Impedance

Se

lec tor. . . . . . . . .

44

4-37. Regulated Power Supply . . . . . . . .

4-4

Section Page

VII

CIRCUIT DIAGRAMS

..

.

......

...

......

7-1

7-1. Introduction

.....

.

..

.

...........

7-1

Section Page

V.

MAINTENANCE

..

...

......

.....

.

.....

5-1

5-1. Introduction .

...

.

...

..

......

.. ..

5-1

54

. Performance Checks. . . . . . . . . . . . .

5-1

5-6. Frequen

cy

Checks

..

...

..

. .

.....

.

5-1

5-7

. Frequency Range Check

...

....

.

....

5-1

5-8. Frequency Accuracy Check .

...

..

.

5-1

5-9. Amplitude Accuracy Checks. .

5-1

5-15.

Level

Flatness Checks

..

.

.........

54

APPENDICES

5-21. Meter Tracking Accuracy Check

.....

5-6

5-22. Attenuator Accuracy Checks

........

5-7

A.

CODE LIST OF MANUFACTURERS

5-28. Balance Checks. . . .

...

. .

..

5-

8

B.

SALES

AND

SERVICE OFFICES

5-35. Distortion Clleck . . . . . . . . . .

5-9

C.

BACKDATING

tii

Table

of

Contents Model 654A

LIST

OF

TABLES

Number

Page

Number

Page

]-1. Specifications

......

..

...........

.

1-2

5-2. Frequency Accuracy Check. .

............

5-3

1-2

. General Information

........

.

1-2

5-3. Thermal Converters for

Level

Flatness Checks

...

5-5

3-1. dBm/Voltage Conversion Chart

.....

.

3·1

54.

Frequency

Adjustments.

. . . . .

..

.

.......

5-13

5-1. Required Test Equipment

..

.

....

. 5·2 5-5. Front Panel Troubleshooting . . . _

..........

5-21

6-1. Replaceable Parts

...........

.

...

6-2

thru 6-12

LIST

OF

ILLUSTRATIONS

Number

Page

Number

Page

I-I.

Model

654A Test Oscillator.

1-2

5-11. Hum and Noise Check

..

5-1

I

2-1.

3-1.

Power Cords . .

Location

of

Con trois, Indicators

and Connectors

2-1

3-2

5-12 Logarithmic Additon

of

Harmonic Components

..

5-1

I

4-1.

RC

Network Characteristics

.....

.

4-1

5-13.

10MHz

Low

Pass

Filter . . .

..

5-11

4-2. Regulated Power Supply Output

5-\4.

Lo

ca

tion

of

Internal Adjustments. .

..

5-12

Voltage

vs

Current

4-5

5·15.

Fr

equency Calibration T

es

t

Setup..

.5-14

4·)

. Simplified Scllematic

of

Current 5-16. Meter Tracklllg Adjustment. . . . .5·17

Limiting Circuitry.

4-5

5-17. Alignment Access Covers for

5-1. Amplitude Accuracy Checks -UNBAL

5-3

Mod

e

ls

65 I

B,

2A, 3A, 4A. .

..

5-25

5·2. Amplitude Accuracy Checks -BAL.

54

5-

j

8.

Troubleshoot ing Tree. . . . 5-27/5-28

5-3.

Level

Fla1ness Checks.

54

6-1. Frequency Tuning

Me

chanis

m.

6-9

54.

Ref

ere

nce

Supply.

. . .

.. ..

. 5·5 6-2. Chassis Mechanical Parts. .

..

.

.....

. .

...

6-10

5-5. Meter Tracking Accuracy Check

..

5·6 7 -I. Block Diagram . .

7-3

5-6

. Attenua'tor Accuracy Checks

...

5·7 7-2. Oscillator and Buffer Ampl if

ier

....

.

7-5

5-7

. Impedance Converter

..

5·8 7-3.

Balan

ce

d Amplifier,

Met

er and

5-8. Balance Checks.

5-9

Levelin g .

..

7-7/7-8

5-9. Balance

Box

..

5·9

74.

Attenuato

rs

and Impedan

ce

Selector

...

.

..

7-9/7-10

5·]0. Distortion Check

........

. . . .5-10 7-5. Power Supplies,

AI

.....

7-11

iv

~

- 7

t-

--.'

~

" t _

l-

+----A..-

_ I •

.-

,

I~.'.

- . -

,I

"-'-~~.J.:o.l\..

_ 1.L.._

A

~

e

;·3

;·5

13

21

12

.

ge

II

·

11

·1

2

·1

4

·17

·25

·28

6·

9

·1

0

7·3

7·5

7·8

·10

·11

Fli;-

HEWLETT

&!e.I

PACKARD

SAFETY

SUMMARY

Thl

following

glnlrlillfity prlclutionl

mUlt

bl

obHrvld

during

III

phllel

of

operltion,

IlrvicI,

Ind

rlplir

of

thil

inltrumlnt.

Flilure

to

comply

with

thell

preclutionl

or

with

Ipecific

wlrningl

ellewhere

in

thil

mlnull viollt

..

Ilflty Itlndlrdl

of

delign,

mlnuflcturl,

Ind

intended

ule

of

the

inltrument.

Hewlett'Plcklrd

Complny

Illumel

no

Iilbility

for

the

cUltomlr'1

flilure

to

comply

with

theSl

requirementl.

Thil

il I Sifety

CII

..

1

inltrument.

GROUND

THE

INSTRUMENT

To minimize shock hazard,

the

instrument

chassis and

cabinet

must

be

connected

to

an elec-

trical

ground.

The

instrument

is equipped

with

a

three-conductor

ac

power

cable. The

power

cable

must

either

be plugged

into

an

approved

three-contact

electrical

outlet

or

used

with

a

three-contact

to

two-contact

adapter

with

the

grounding

wire

(green)

firmly

connected

to

an

electrical

ground

(safety

ground)

at

the

power

outlet.

The

power

jack

and

mating

plug

of

the

power

cable

meet

International

Electrotechnical

Commission

(IEC)

safety

standards.

DO

NOT

OPERATE

IN

AN

EXPLOSIVE

ATMOSPHERE

Do

not

operate the

instrument

in

the

presence

of

flammable

gases

or

fumes.

Operation

of

any

electrical

instrument

in such an

environment

constitutes

a

definite

safety

hazard.

KEEP

AWAY

FROM

LIVE

CIRCUITS

Operating personnel

must

not

remove

instrument

covers.

Component

replacement

and internal

adjustments

must

be made

by

qualified

maintenance

personnel. Do

not

replace

components

with

power

cable

connected.

Under certain

conditions,

dangerous

voltages

may

exist

even

with

the

power

cable removed.

To

avoid injuries,

always

disconnect

power

and

discharge

circuits

before

touching

them.

DO

NOT

SERVICE

OR

ADJUST

ALONE

Do

not

attempt

internal service

or

adjustment

unless

another

person, capable

of

rendering

first

aid and resuscitation, is present.

DO

NOT

SUBSTITUTE

PARTS

OR

MODIFY

INSTRUMENT

Because

of

the danger

of

introducing

additional

hazards,

do

not

install

substitute

parts

or

per-

form

any

unauthorized

modification

to

the

instrument.

Return

the

instrument

to

a

Hewlett

-

Packard Sales and Service

Office

for

service and repair

to

ensure

that

safety

features are main-

tained.

DANGEROUS

PROCEDURE

WARNINGS

Warnings, such as

the

example

below,

precede

potentially

dangerous

procedures

throughout

this manual.

Instructions

contained

in

the

warnings

must

be

followed.

I

WARNING

I

Dingeroul

voltagll, clplble

of

cluling

delth,

Irl

prelent

in

thil

inltrument.

Ule

ex·

treml

clution

whl"

hlndling,

tilting,

Ind

Idjulting.

A

SAFETY

SYMBOLS

General

Definitions

of

Safety

Symbols

Used

On

Equipment

or

In

Manuals.

Instruction manual symbol: the product will be marked with this

symbol when

it

is necessary for the user to refer to the instruction

manual

in

order to protect against damage to the

in

strument.

Indicates dangerous voltage (terminals

fed

from the interior

by

voltage exceeding 1000 volt s must

be

so marked).

Protective conductor terminal. For protection against electrical

OR

~

shock

in

case

of

a fault. Used with field wiring terminals to in-

'0

dicate the terminal which must

be

connected to ground before

operating equipment.

Low-noise or noisele

ss

, clean ground (earth) terminal. Used for a

signal common, as well as providing protection again st electrical

shock

in

case

of

a fault. A terminal marked with this symbol must

be connected to ground

in

the manner described

in

the

in

stallation

(operating) manual , and before operating the equipment.

Frame or chass

is

terminal. A connection to the frame (chassis)

of

rh

OR

..L

the equipment which normally includes all expos

ed

metal struc-

tures.

Alternating current (power line).

Direct current (power line) .

Alternating or direct current (power line).

I The

WARNING

sign denotes a hazard.

It

calls attention to a pro-

WARNING

cedure, practice, condition

or

the like, which, if not correctly per-

"'------

••

formed

or

adhered to, could result

in

injury

or

death to personnel.

The

CAUTION

sign denotes a hazard .

It

calls attention to an

operating procedure, practice, condition 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.

The NOTE sign

denote

s important information .

It

calls attention

NOT

E : to procedure, practice, condition

or

the like, which

is

essential to

highlight.

.-

~

-

.1-

_

.

-~.:..

Model

654A

Section I

SECTION

GENERAL

INFORMATION

1-1_

DESCRIPTlON_

1-2

. The Hewlett-Packard Model

654A

Test Oscillator

is

an

ideal

general purpose signal source whenever a flat balanced

or

unbalanced test signal

is

required . Balanced outputs

of

135

ohms, 150 ohms and 600 ohms have many uses

in

the

communications industry. Automatic leveling, together

with the expanded meter, make the

654A

ideally suited to

voltmeter calibration or to test frequency response

of

components during manufacture. The instrument

is

shown

in

Figure I-I and the specifications are listed

in

Table I-I.

General information relating to the instrument

is

listed

in

Table

1-2.

The information

in

Table

1-2

should not be

considered specifications.

1-3. The Model

654A

is

a stable,

low

distortion sine-wave

signal

source with a flat frequency response

of

+/-0.5% over

the frequency range

of

10Hz

to 10

MHz.

The attenuators

allow the signal to be adjusted

in

I

dB

and

10

dB

steps

from +10

dBm

to

-89

dBm, and the front panel

AMPLITUDE control allows a continuous adjustment

in

level

of

+/-1

dB

from the settings shown on the OUfPUT

LEVEL attenuators. The flat frequency response

is

achieved by automatic leveling circuits within the

654A.

1-4.

Five

output impedances are available, selected by a

front panel push-button control: these are 50 and 75 ohms

unbalanced and 135, 150 and 600 ohms balanced. Balance

is

greater than 50

dB

up to I

MHz

and greater than

40

dB

up to 5

MHz

.

1-5.

The meter scale

is

expanded to indicate 0 dBm at

center scale, with a total range

of

+/-1

dBm. The metering

circuit monitors the signal

level

before the attenuators

so

that the meter indication

is

independent

of

the attenuator

settings; the meter indicates the signal level set by the front

panel AMPLITUDE control. The

output

signal

level

into

the load

is

the algebraic sum

of

the meter indication and

the OUTPUT LEVEL attenuator settings.

1-6.

An

additional feature

is

the COUNTER OUTPUT rear

panel

BNC

connector. This allows the Model

654A

frequency to be continuously monitored by

an

electronic

counter without interrupting measurements or affecting

terminal balance .

1-7.

SUPPLIED

ACCESSORIES.

Rack mount kit: -hp- Part

No.

5060-0775.

1-8.

RECOMMENDED

ACCESSORIES.

-hp-

II

048C 50 ohm Feedthrough Termination

-hp-

II

094A

75 ohm Feedthrough Termination

-hp- 11095A

600

ohm Feedthrough Tennination

-hp-11l43A

Balanced

BNC

to Alligator clip cable

1-9.

INSTRUMENT

AND

MANUAL

IDENTIFICATION.

1-10.

Hewlett-Packard uses a two-section serial number.

The first section (prefix) identifies a series

of

instruments.

The last section (suffix) identifies a particular instrument

within the series. If a letter

is

included with the serial

number, it identifies the country

in

which the instrument

was

manufactured.

If

the serial prefix

of

your instrument

differs from the one

on

the title page

of

this manual, a

change sheet

will

be supplied to make this manual

compatible with newer instruments or the backdating

information

in

Appendix C

will

adapt this manual to earlier

instruments.

All

correspondence with Hewlett-Packard

should include the complete serial number.

1-1

Section 1 Model

654A

I

-

B l

floO

S }

r

Figure 1-1. Model

654

A Test Oscillator

Table

I-I.

Specifications

frequency

range: 10

Hz

to

10 MHz in 6 bands.

Frequency

accuracy:

100

Hz

(on

Xl

00

RANGE)

to

5 MHz: +/-2%

10

Hz

to 100 Hz: +/-3 %

5

MHz

to

10

MHz: +/-4%

Level flatness(+IO dBm and 0

dBm):

+/-0.5% referenced

to level

at

I kHz from

10Hz

to 10 MHz for un-

balanced

outputs,

10

Hz

to

5

MHz

for 135

ohm

and

150

ohm

outputs,

and 10

Hz

to I

MHz

for

600

ohm

output.

Attenuator

Range: 99 dB in 10 dB and I dB steps.

Accuracy: +/-1.5%

(0

.

15

dB)

except +/-10%

(I

dB)

at

output

levels below

60

dBm

at

frequencies greater

than

300

kHz.

Amplitude

control:

greater

than

2 dB.

Amplitude

accuracy:

+/-1

% for

90

days (at I kHz,

+ I 0 dBm level with

meter

centered).

Meter tracking: +/-0.05 dB.

Balance

(on

balanced impedances) when measured by the

procedure

given in Paragraph 5-28 : greater

than

50 dB

for frequencies from

10Hz

to I MHz, greater than

40

dB

to

5 MHz .

Distortion

(THD)

10Hz

to

I MHz : greater

than

40

dB below

fu

nda-

mental.

I

MHz

to

10

MHz: greater

than

34

dB below funda-

mental.

Hum

and

noise: greater than

70

dB

down

at

full

output.

Table 1-2. General

Information

Output

impedance:

50

ohm

unbalanced, 75

ohm

un-

balanced, 135

ohm

balanced, 150

ohm

balanced and

600

ohm

balanced.

Output

level:

+11

dBm to -90 dBm, 10 dB and I dB

steps

with adjustable

+/-1

dB

meter

range; calibrated for

each

impedance

.

Meter resolution:

0.02

dB.

1·2

Output

connectors:

BNC . Maximum voltage which can

be

applied

to

the

output:

less

than

+/-3 V peak.

Counter

output:

greater

than

0 .1 V rms

into

50

ohm

,

BNC

connector.

Operating

temperature:

OOC

to

+550 C

(32°F

to

130°F).

Power: 115 V

or

230

V +/ . 10%, 48

Hz

to

66

Hz,

30

W .

1/

1

nominal, 35 W max.

~

I

554A

Model

654A Section

II

SECTION

II

INSTALLATION

2-1.

INTRODUCTION.

2-2.

This section contains information and instructions

necessary for installing and shipping the Model 654A Test

Oscillator. Included are initial inspection procedures, power

and grounding requirements, environmental information,

installation instructions and instructions for repackaging for

shipment.

2·3.

INITIAL

INSPECTION.

2-4.

This instrument

was

carefully inspected both

mechanically and electrically before shipment. It should be

physically free

of

mars or scratches and

in

perfect electrical

order upon receipt. To confirm this, the instrument should

be

inspected for physical damage

in

transi t. Also. check for

supplied accessories, and test the electrical performance

of

the instrument using the proced

ure

outlined

in

Section

Vof

this manual. If there

is

damage or deficiency, see the

warranty on

Page

ii

of

this manual.

2·5.

POWER

REQUIREMENTS.

kHz, 2·6. This instrument

will

operate from either 115 or

230 V ac,

48

Hz

to 66

Hz.

The instrument can easily be

the position

of

the slide switch located

on

the rear panel, so

that the designation appearing on the switch matches the

nominal voltage

of

the power source.

the

o

dB

than

Be/ore applying primary power to the 654A

be slire it is set for the proper

fine

voltage

as

olltlined

in

Paragraph

3-8.

Inda-

2-7.

Power

Cords.

Inda-

2-8.

Figure

2-J

illustrates the standard power plug config-

urations that are

used

throughout the United States and

in

tput. other countries. The

-hp-

part number directly below each

drawing

is

the part number for a 654A power cord

equipped with a power plug

of

1hat configuration. If the

appropriate power cord

is

not included with the instru-

ment , notify the nearest -hp- Sales and Service Office and a

replacement cord will be provided.

2-9.

GROUNDING

REQUIREMENTS.

2-10.

To protect operating personnel, the National Electri-

cal

Manufacturer's Association (NEMA) recommends that

the instrument panel and cabinet

be

grounded. The Model

654A

is

equipped with a three-conductor power cord

which , when plugged into an appropriate receptacle,

grounds the instrument. The offset pin

on

the power plug

is

the ground connection.

8120-1351

8120-1369

8120-1689

STO·8-419~

'UL

LISTED FOR

USE

IN THE UNITED STATES

OF

AMERICA

Figure 2-1.

Power

Cords.

2-11.

INSTALLATION.

2-12. This instrument

is

fully transistorized: therefore no

special cooling

is

required. However, the instrument should

not

be

operated where the ambient temperature

is

outside

the limits specifed

in

Table 1·2.

2-13.

RACK/BENCH

INSTALLATION.

2-14. This instrument

is

initially shipped

as

a bench-type

instrument (unless ordered specifically

as

a rack-type) with

plastic feet and tilt stand

in

place. Conversion

to

a rack-

mounted inst rument can

be

accomplished

by

using the

rack-mounting kit and instruction furnished with

YOUl

inst rumen t.

2-15_

REPACKAGING

FOR

SHIPMENT.

2-16. The following

is

a general guide for repackaging for

shipment. If you have any question, contact your local

-hp-

Sales and Service Office_(See Appendix

at

the back

of

this

manual for office location.)

NOTE

If

the instrument is

to

be shipped to Hewlett-

Packard

for

service or repair, attach a

tag

to

the instrument identifying the owner and

indicating the service

or

repair to be accom-

plished; include the model number and full

serial

number

of

the instrument. In any corre-

spondence, identify the instrument

by

model

number

and serial number.

a.

Place instrument

in

original container if avail-

able. If original container

is

not available, a suit-

able one can

be

purchased from your nearest -hp-

Sales and Service Office.

2-1

Section II Model 654A

If

original conlainer

is

nol used.

b.

Wrap

insirllineni

in

heavy paper or plaslic before

placing

in

In

inner conlainer.

c.

Use

plenly

of

packing malerial

aroLind

all

sides

of

insirLimenl and proieci panel

faces

wilh cardboard

sl

rips.

d.

e.

Place inslrumenl and inner container

in

a heavy

carlon or wooden box

a'nd

seal

will] slrong lape or

i1lel~1

bands. .H I

Mark

shipping conlainer wilh

"DELICATE

INSTRUMENT,"

"FRAGILE"

ele.

2-2

-

11Jj

I L -.

,1,1..

!."

HP 654A Service manual

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