HP 333A Manual de servicio

Errata

Title & Document Type: 333A/334A Distortion Analyzer Operating & Service Manual

Manual Part Number: N/A

Revision Date: October 1985

HP References in this Manual

This manual may contain references to HP or Hewlett-Packard. Please note that

Hewlett-Packard's former test and measurement, semiconductor products and chemical

analysis businesses are now part of Agilent Technologies. We have made no changes to

this manual copy. The HP XXXX referred to in this document is now the Agilent XXXX.

For example, model number HP8648A is now model number Agilent 8648A.

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I.

•

c,:

~

..,

c

..,

ca.

.,;:

OPERATING

AND

SERVICE

MANUAL

DISTORTION

ANALYZER

333A/334A

F/,o'I

HEWLETT

a!/!111

PACKARD

•

________

F/,°oW

HEWLETT

______

_

~~

PACKARD

OPERATING

AND

SERVICE

MANUAL

MODEL

333A/334A

D

ISTO

RTIO

N

ANALYZER

Serial

Numbers:

333A:

1137A03146

and greater

334A:

1140A05641

and greater

Appendix

C, Manual

Backdating

Changes, adapts this

manual

to

lower

serial

numbers.

WARNING

I

To

help minimize the

possibility

of

electrical fire

or

shock

hazards, do

not

expose this

instrument

to

rain

or

excessive moisture.

Manual Part No. 00333-90008

Microfiche Part No. 00333-90058

©Copyright Hewlett-Packard Company

1966

P.O.

Box

301,

Loveland, Colorado,

80537

U.S.A

.

Printed: October 1975, 1985

•

Model 333A/334A

Table

of

Contents

TABLE

OF

CONTENTS

Section

I GENERAL INFORMATION •

1-1.

Description

•••..

1-6.

Accessory

Features.

1-8.

Option

•••••..•

1-10.

Instrument

Identification

Section

II INSTALLATION.

2-1.

Introduction

•

2-3.

Inspection

••

2-5.

Power

Requirements

2-7.

Three-Conductor

Power

Cable

2-10.

Installation

••..•.

2-12.

Bench

Installation

•.•

2-14.

Rack

Installation

••••

2-16.

Repackaging

For

Shipment

Section

III OPERATING INSTRUCTIONS

3-1.

Introduction

• . • • . •

3-4.

Controls

and

Indicators

•

3-6.

General

Operating

Information

•

3-7.

Input

Connections

•••.•

3-9.

Voltmeter

Characteristici:

3-12.

Output

Terminals

••

3-14.

Operating

Procedures

••

3-15.

Instrument

Turn-On

•

3-16.

Adjustment

of

Meter

3-18.

3-21.

3-22.

3-23.

3-27.

3-30.

Mechanical

Zero.

•

Distortion

Measurement

Distortion

Measurement

of

AM

RF

Carriers

(334A only).

Voltage

Measurement

•••

Meter

Indication

• • • • •

Use of Output

Terminals

.

333A/334A with Option 01

3-32.

Manual

Nulling •

Section

IV THEORY

OF

OPERATION •

4-1.

Overall

Description.

4-3.

Block

Diagram

Description

.

4-4.

Distortion

Measuring

Operation

•.••••.

4-8.

Distortion

Measurement

in

AM

4-10.

4-12.

4-13.

4-17.

4-39.

4-41.

4-49.

4-54.

Section

Carriers

•••••..••

Voltmeter

Operation

.•••.

Detailed

Circuit

Description

• • .

Impedance

Converter

Circuit

.

Rejection

Amplifier

Circuit.

High

Pass

Filter

. • • . • • •

Meter

Amplifier

••.•••.

Power

Supply

Circuit

• • • • .

RF

Detector

Circuit

(334A only)

V MAINTENANCE • . • • • • . • •

5-1.

Introduction

•••••..•

5-3.

Required

Test

Equipment

•

Page

1-3

Page

2-1

Page

3-1

3-2

3-3

3-4

Page

4-1

4-2

4-5

4-7

Page

5-1

Section

V MAINTENANCE (Cont'd)

•.••••.•.

5-5,

Performance

Checks

•.....•

5-9.

Fundamental

Rejection

Check

5-10.

Second

Harmonic

Accuracy

..

5-11.

Instrument

Induced

5-12.

5-13.

5-14.

5-17.

5-18.

5-19.

5-20.

5-21.

5-22.

Distortion

Check.

. . . . . .

Frequency

Calibration

Accuracy

Check

•..•..•......

Automatic

Nulling Mode

Check

Input

Impedance

Check

. . .

Minimum

Input

Level

Check. •

DC

Isolation

Check

. . . . . .

Voltmeter

Accuracy

and

Frequency

Response

Check.

High

Pass

Filter

Check

• •

Residual

Noise

Check

. • . . •

AM

Detector

Check

(Model

334A only)

.••••..

5-23.

Adjustment

and

Calibration

5-26.

5-27.

5-28.

Procedure

.......••

Power

Supply

and

Bias

Adjustments

• • • . • • . • .

Voltmeter

Gain

Adjustments

.

Voltmeter

Frequency

Response

Adjustment

• • • • • • • • .

5-29.

Bridge

Balance

Adjustment

••

5-30.

Sensitivity

SwitchCalibration.

5-31.

Adjustment

of

Factory

Selected

Components

. • • • • • •

5-33.

Troubleshooting

Procedure

.•

5-38.

Troubleshooting

Voltmeter

Function

•.•...•..

5-40.

Troubleshooting

Distortion

Function

.•.....•••

5-45.

Photoresistor

Check

and

Adjustment

(A6Vl

thruA6V5).

5-49.

Servicing

Etched

Circuit

Boards

•••.....•

5-52.

Servicing

Rotary

Switches.

5-54.

Isolating

the

Impedance

Converter

. . .

...

Section

VI

REPLACEABLE PARTS

..

6-1.

Introduction

•.••.

6-4.

Ordering

Information

•

6-6.

Non-Listed

Parts

.•.

Section

VII

CIRCUIT DIAGRAMS .

7

-1.

Introduction

• . •

Appendix

A CODE LIST

OF

MANUFACTURERS

B

C

SALES

AND

SERVICE

OFFICES

MANUAL BACKDATING CHANGES

Page

5-1

5-2

5-3

5-4

5-5

5-6

5-7

5-8

5-10

5-11

5-12

5-14

5-15

5-16

Page

6-1

Page

7-1

iii

-----

-

-------

- -

----------

Table

of

Contents

Model

333A/334A

LIST

OF

TABLES

Number

Page

Number

1-1.

Specifications.

. • . . . . . . .

1-1

5-5.

Power

Supply

and

Bias

Adjustments

.

3-1.

Effect

of

Harmonics

on Voltage

5-6.

Sensitivity

Switch

Calibration

Measurements.

. . . . . . .

3-1

5-7.

Factory

Selected

Components

5-1.

Required

Test

Equipment.

. . •

5-0

5-2. Second

Harmonic

Accuracy

Check

•

5-2

5-8.

Troubleshooting

Aid .

5-3.

Frequency

Calibration

Accuracy

Check

5-4

5-9.

Photoresistor

Check

•

5-4.

Voltmeter

Frequency

Response

Check

5-6

6-1.

Replaceable

Parts

..

Page

5-8

5-12

5-13

5-15

6-6

LIST

OF

ILLUSTRATIONS

Number

1-1. Model 333A

Distortion

Analyzer

3-1.

Front

and

Rear

Panel

Description

.

3-2.

Manual Nulling

Test

Setup

3-3.

Impedance

Correction

Graph

• . .

4-1.

Block

Diagram

. • . • • . • . .

4-2.

Bridge

Waveforms

. . .

•.•

4-3. Wien

Bridge

Circuit

and

Rejection

Characteristics

. . . • . • . .

4-4. Auto

Control

Loop

Detector.

.

•..

4-5.

Reference

and

Error

Phase

Relationship

• . • • • . .

•...

4-6.

Rejection

Amplifier

Block

Diagram

and

Typical

Frequency

Rejection

Characteristic

. . • • •

4-7.

Bandwidth

Versus

Null Depth

.•

4-8.

Simplified

Metering

Circuit

..•

5-1.

Fundamental

Rejection

Check

5-2.

Instrument

Induced

Distortion

Check

.•

5-3.

Frequency

Calibration

Accuracy

Check

iv

Page

1-1

3-0

3-5

4-0

4-2

4-3

4-4

4-5

4-6

4-7

5-1

5-2

5-3

Number

Page

5-4.

5-5.

5-6.

5-7.

5-8.

6-1.

6-2.

6-3.

7-1.

7-2.

7-3.

7-4.

7-5.

7-6.

Capacitance

Check

. • • • •

DC

Isolation

Check

. . . • .

Voltmeter

Accuracy

and

Frequency

Response

Check

. .

Shielded

Load

Assembly

.

Adjustment

and

Chassis

Mounted

5-5

5-6

5-7

5-8

Component

Location.

. .

5-9

Mechanical

Parts

. .

6-2

Modular

Cabinet

Parts

• .

6-4

Frequency

Tuning

Assembly

6-5

Internal

Wiring

Data.

. . .

7-3/7-4

Impedance

Converter

(P/0

A2)

and

RF

Detector

(A4) . . • . . . .

7-5/7-6

Rejection

Amplifier

(A3),

Bridge

Balance

(P/OA6)

and

High

Pass

Filter

(A7)

7-7/7-8

Meter

Amplifier

(P/0

A2)

......

7-9/7-10

Control

Circuit

(A5)

and

Bridge

Balance

(P/0

A6)

.

Power

Supply (Al) . . . . . •

7-11/7-12

7-13/7-14

t)

•

-------

F/ip'9

HEWLETT

~~

PACKARD

SAFETY

SUMM°ARY

The

following

general

safety

precautions

must

be

observed

during

all

phases

of

operation,

service,

and

repair

of

this

instrument.

Failure

to

comply

with

thasa

precautions

or

with

specific

warnings

alsawhara

in

this

manual

violates

safety

standards

of

design,

manufacture,

and

intended

use

of

the

instrument.

Hewlett-Packard

Company

assumes

no

liability

for

the

customer's

failure

to

comply

with

these

requirements.

This

is

a

Safety

Class

1

instrument.

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

containec;t

in

the

warnings

must

be

followed.

I-

WARNING

I

Dangerous

voltages,

capable

of

causing

death,

are

present

in

this

instrument

Use

ex-

trema

caution

when

handling,

tasting,

and

adjusting

.

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 instrument.

Indicates dangerous voltage (terminals fed from the interior by

voltage exceeding

1000

volts must be so marked).

Protective conductor terminal. For protection against electrical

-1-

OR

~

shock in case

of

a fault. Used with field wiring terminals

to

in-

-

~

dicate the terminal which must

be

connected to ground before

177

OR

.L

operating equipment.

Low-noise

or

noiseless, clean ground (earth) terminal. Used for a

signal common, as well

as

providing protection against electrical

shock in case

of

a fault. A terminal marked with this symbol must

be connected

to

ground

in

the manner described

in

the installation

(operating) manual, and before operating the equipment.

Frame

or

chassis terminal. A connection to the frame (chassis)

of

the equipment which normally includes all exposed metal struc-

tures.

Alternating current (power line).

Direct current (power line).

Alternating

or

direct current (power line).

WARNING

IThe WARNING sign denotes a hazard. It calls attention

to

a pro-

cedure, practice, condition

or

the like, which, if not correctly per-

•-----•-

formed

or

adhered to, could result in injury

or

death

to

personnel.

NOTE:

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 denotes important information. It calls attention

to procedure, practice, condition

or

the like, which

is

essential to

highlight.

0

tJ

•

Model

333A/334A

Section

I

SECTION

I

GENERAL

INFORMATION

1-1.

DESCRIPTION.

1-2.

The

Hewlett-Packard

Models

333A

and

334A

Distortion

Analyzers

are

solid

state

instruments

for

measuring

distortion

on

ac

voltages.

The

Models

333A

and

334A

include

two

control

loops

that

auto-

matically

tune

both

legs

pf

a

bridge

circuit

which

re-

jects

the

fundamental

when

the

rejection

circuit

is

initially

set

within

the

range

of

the

loops.

The

334A

has

a

high

impedance

detector

which

operates

from

550

kHz

to

greater

than

65 MHz

and

provides

the

ca-

pability

of

monitoring

the

distortion

of

the

amplitude

modulation

on

an

rf

carrier.

1-3.

Distortion

levels

of

O.

1%

to

100%

full

scale

are

measured

in

seven

ranges

for

any

fundamental

frequen-

cy

of

5

Hz

to

600 kHz.

Harmonics

are

indicated

upto

3 MHz.

The

high

sensitivity

of

these

instruments

re-

quires

only

0.

3V

rms

for

the

100%

set

level

reference.

The

distortion

characteristics

can

be

monitored

at

the

OUTPUT

connectors

with

an

oscilloscope,

a

true

rms

voltmeter,

or

a

wave

analyzer.

The

instruments

are

capable

of

an

isolation

voltage

of

400

volts

above

chassis

ground.

1-4.

The

voltmeter

can

be

used

separately

for

general

purpose

voltage

and

gain

measurements.

It

has

a

frequency

range

of 5 Hz

to

3 MHz (20 Hz

to

500 kHz

for

300

µ

V

range)

and

a

voltage

range

of 300

µ

V

to

300 V

rms

full

scale.

1-5.

The

AM

detector

included

in

the

Model

334A

is

a

broadband

de

restoring

peak

detector

consisting

of

a

semiconductor

diode

and

filter

circuit.

AM

distor-

tion

ievels

as

low

as

0.

3%

can

be

measured

on

a 3 V

to

8 V

rms

carrier

modulated

30%

in

the

standard

broadcast

band.

Distortion

less

than

1%

can

be

measured

at

the

same

level

of

the

carrier

up

to

65

Mc.

Table

1-1.

MODEL

333A

DISTORTION MEASUREMENT RANGE

Any

fundamental

frequency,

5 Hz

to

600 kHz.

Distortion

levels

of

O.

1%-100%

are

measured

full

scale

in

7

ranges.

DISTORTION MEASUREMENT ACCURACY

Harmonic

measurement

accuracy

(full

scale)

Fundamental

Input

Less

Than

30 V

RANGE

±3%

±6%

±12%

100%-0.

3%

10 Hz

10

Hz

1 MHz 3 MHz

0.1%

30

Hz

20 Hz

10

Hz

300 kHz 500 kHz

1.2

MHz

1-6.

ACCESSORY FEATURES.

1-7.

The

accessory

available

with

the333Aand334A

Distortion

Analyzers

is

a

voltage

divider

probe,

-hp-

Model

No. 10001A.

The

features

of

the

probe

are:

a.

10

megohms

shunted

by 10

pF,

giving

10:1

attenuation.

b.

DC

to

30 MHz bandwidth.

c.

2%

division

accuracy.

d. 600 V

peak

input.

e.

5

ns

rise-time.

1-8.

OPTION.

1-9.

Option

01

is

a

standard-hp-

Model

333A

or

334A

with

a

special

meter

and

meter

amplifier,

compen-

sated

to

permit

response

to

VU

(volume

units)

characteristics.

1-10

INSTRUMENT IDENTICATION.

1-11.

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

coun-

try

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

compatable

with

new-

er

instruments

or

the

backdating

information

in

Appen-

dix

C

will

adapt

this

manual

to

earlier

instruments.

All

correspondence

with

Hewlett-Packard

should

in-

clude

the

complete

serial

number.

Specifications

Fundamental

Input

Greater

Than

30 V

RANGE

±3% ±6%

±12%

100%-0.

3%

10

Hz

10Hz

10 Hz

300 kHz 500 kHz 3 MHz

0.1%

30

Hz

20

Hz

10

Hz

300 kHz 500 kHz

1.2

MHz

Elimination

Characteristics:

Fundamental

Rejection

> 80

dB

Second

Harmonic

Accuracy

for

a

fundamental

of:

5 Hz

to

20

Hz:

better

than

+

1 dB

20 Hz

to

20 kHz:

better

than

±0.

6 dB

20

kHz

to

100 kHz:

better

than

-1

dB

·

100 kHz

to

300

kHz:

better

than

-2

dB

300 kHz

to

600 kHz:

better

than

-3

dB

1-1

Section I Model 333A/334A

Table

1-1.

Specifications

(Cont'd)

Distortion

Introduced

by

Instrument:

>

-70

dB

from

5

Hz

to

200 kHz

>

-64

dB

from

200 kHz

to

600 kHz

Meter

indication

is

proportional

to

the

aver-

age value of a

waveform.

FREQUENCY CALIBRATION ACCURACY

Better

than

±5%

from

5 Hz

to

300 kHz

Better

than±

10%

from

300 kHz

to

600 kHz

INPUT IMPEDANCE

Distortion

Mode: 1

Mn

±5%

shunted

by <70

pF.

Voltmeter

Mode:

1

Mn

±5%

shunted

by <30

pF

(333A only),

1

Mn

±5%

shunted

by <35

pF

(334A only),

1

to

300 V

ranges;

1

Mn

±5%

shunted

by<70pF,

300 µ V

to

O.

3 V

ranges.

INPUT

LEVEL

FOR

DISTORTIONMEASUREMENTS

0. 3 V

rms

for

100%

set

level

(up

to

300 V

may

be

attenuated

to

set

level

reference).

The

minimum

measurable

distortion

for

floating

operation

on

the

Xl

frequency

range

is

50dB

below the fundamental.

DC ISOLATION

Signal

ground

may

be ±400 Vdc

from

external

chassis.

VOLTMETER RANGE

300 µ V

to

300 V

rms

full

scale

(13

ranges),

10 dB

per

range.

VOLTMETER FREQUENCY RANGE

5 Hz

to

3 MHz (300 µ V

range:

20

Hz-500 kHz).

VOLTMETER ACCURACY:

RANGE

±2%

±5%

300

µV

30 Hz-300 kHz 20

Hz-500kHz

1 mV-30 V 10

Hz-1

MHz 5

Hz-3

MHz

100V-300V

10

Hz-300

kHz 5 Hz-500 kHz

NOISE MEASUREMENTS

Voltmeter

residual

noise

on

the

300 µ V

range:

< 25 µ V

rms

terminated

in

shielded

600n; <30

µ V

rms

terminated

in

shielded

100

kn.

OUTPUT

For

input

frequencies

from

20 Hz

to

600 kHz,

0. 1 V

rms

± 0. 01 V open

circuit

for

full

scale

meter

deflection;

0.05 V

rms

± 0. 005 V into

2

kn

for

full

scale

meter

deflection.

AUTOMATIC NULLING MODE

Set

Level:

At

least

O.

2 V

rms.

Frequency

Ranges:

Xl,

manual

null

tuned

to

less

than

3%

of

set

level;

total

frequency

hold-in

±0.

5%

about

true

manual

null.

XlO

through

XlO

K,

manual

null

tuned

to

less

than

10%

of

set

level;

total

frequency

hold-in±

1%

about

true

manual-null.

AUTOMATIC NULL ACCURACY

5 Hz

to

100 Hz:

Meter

reading

within

Oto

+3

dB of

manual

null.

100 Hz

to

600 kHz:

Meter

reading

within

O

to

+1. 5 dB of

manual

null.

HIGH-PASS

FILTER

3

dB

point

at

400 Hz with 18 dB

per

octave

roll

off.

60

Hz

rejection

> 40 dB.

Normally

used

only with

fundamental

frequencies

greater

than

1 kHz. ·

POWER

SUPPLY

100 V

/120

V

/220

V

/240

V +

5%

-10%, 48 -

66 Hz,

approximately

4

watts.

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

MODEL 334A

Same

as

Model 333A

except

as

indicated

below:

AM DETECTOR

High

impedance

de

restoring

peak

detector

with

semi-conductor

diode

operates

from

550kHz

to

greater

than

65 MHz.

Broadband

input.

Maximum input; 40 V

p-p

ac

or

40 V

peak

transient.

CARRIER FREQUENCY

1-2

550kHz

to

1. 6 MHz:

Distortion

introduced

by

detector

is

<

O.

3%

for

3

to

8

volt

carriers

modulated

30%.

1. 6 MHz

to

65

MHz:

Distortion

introduced

by

detector

is

<

1%

for

3

to

8

volts

rms

carriers

modulated

30%.

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

Distortion

measurement

at

carrier

levels

as

low

as

1 volt

may

be

made

with

reduced

accuracy.

OPTION: 01

Indicating

meter

has

VU

characteristics

con-

forming

to

FCC

Requirements

for

AM,

FM,

and

TV

broadcasting.

0i

.

•

Model 333A/334A Section II

SECTION

II

INSTALLATION

2-1.

INTRODUCTION.

2-2.

This

section

contains

information

and

instruc-

tions

necessary

for

the

installation

and

shipping

of the

Models

333A/334A

Distortion

Analyzers.

Included

are

~itial

inspection

procedures,

power

and

grounding

requirements,

installation

information,

and

instruc-

tions

for

repackaging

for

shipment.

2-3.

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

transit.

Also

check

for

supplied

accessories

and

test

the

electrical

performance

of the

instrument'

using

the

procedure

outlined in

Paragraph

5-5.

If

!he7e

is

damage

or

deficiency,

see

the

warranty

on

the

ms1de

front

cover

of

this

manual.

2-5.

POWER

REQUIREMENTS.

2-6.

The

Model 333A/334A

can

be

operated

from

any

ac

source

of 100 V

/120

V

/220

V

/240

V

+

5%

-

10%,

48 -66 Hz. With

the

instrument

disconnected

from

the

ac

power

source,

move

the

slide

(located

on

the

rear

panel)

until

the

desired

line

voltage

appears.

Power

dissipation

is

approximately

4

watts.

2-7.

THREE-CONDUCTOR

POWER

CABLE.

2-8.

To

protect

operating

personnel,

the

National

Electrical

Manufacturers'

Association

(NEMA)

recom-

mends

that

the

instrument

panel

and

cabinet

be

grounded.

All

Hewlett-Packard

instruments

are

equipped

with

a

three-conductor

power

cable,

which, when plugged

in-

to

an

appropriate

receptacle,

grounds

the

instrument.

The~ffsetpinon

the

power

cable

three-prong

connec-

tor

1s

the

ground

wire.

2.9

.INSTALLATION.

2-10.

The

Model 333A/334A

is

fully

transistorized;

therefore,

no

special

cooling

is

required.

However,

the

instrument

should not be

gperated

where

the

am-

bient

temperature

exceeds

55

C (131°

F).

2-11.

BENCH INSTALLATION.

2-12.

The

Model 333A/334A

is

shipped

with

plastic

feet

and

tilt

stand

in

place,

ready

for

use

as

a

bench

instrument.

2-13.

RACK INSTALLATION..

2-14.

The

Model 333A/334A

may

be

rack

mounted

by

using the 5"

Rack

Mount Kit

(-hp-

Part

No. 5060-0775).

Instructions

for

the

conversion

are

included with

the

kit.

The

rack

mount

for

the

Model

333A/334A

is

an

EIA

standard

width

of

19

inches.

When mounted in a

rack

using

the

rack

mount

kit,

additional

support

at

the

rear

of

the

instrument

should

be

provided

if

vibra-

tion

or

similar

stress

is

likely.

2-15.

REPACKAGING

FOR

SHIPMENT.

2-16.

The

following

paragraphs

contain

a

general

guide

for

repackaging

of

the

instrument

for

shipment.

Refer

to

Paragraph

2-17

if

the

original

container

is

to

be

used;

2-18

if

it

is

not.

If

you

have

any

questions,

con-

tact

your

local

-

hp

-

Sales

and

Service

Office. (See

Appendix

B

for

office

locations.)

If

the

instrument

is

to

be

shipped·

to

Hewlett-Packard

for

service

or

repair,

attach

a

tag

to

the

instrument

identify-

ing the

owner

and

indicate

the

service

or

repair

to

be

accomplished.

Include

the

model

number

and

full

serial

num-

ber

of the

instrument.

In

any

corres-

pondence, identify

the

instrument

by

model

number,

serial

number,

and

serial

number

prefix.

2-17.

If

original

container

is

to

be

used,

proceed

as

follows:

a.

Place

instrument

in

original

container

if

avail-

able.

If

original

container

is

not

available,

a.suitable

one

can

be

purchased

from

your

nearest

-hp-

Sales

and

Service

Office. .

b.

Ensure

that

container

is

well

sealed

with

strong

tape

or

metal

bands,

2-18.

If

original

container

is

not

to

be

used,

proceed

as

follows:

a.

Wrap

instrument

in heavy

paper

or

plastic

be-

fore

placing

in

an

inner

container.

b.

Place

packing

material

around

all

sides

of

in-

strument

and

protect

panel

face

with

cardboard

strips.

c.

Place

instrument

and

inner

container

in a heavy

carton

or

wooden box

and

seal

with

strong

tape

or

metal

bands.

d,

Mark

shipping

container

with "DELICATE

INSTRUMENT,"

"FRAGILE,"

etc.

2-1

HP 333A Manual de servicio

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