Agilent Technologies 300A User manual

Errata

Title & Document Type: 300A Harmonic Wave Analyzer

Manual Part Number: N/A

Revision Date: 11/30/1955

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

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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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OPERATING

MANUAL

PLUS

SERVICE

MANUAL

MODEL

300A

HARMONIC

WAVE

ANALYZER

This

combined

Operation,

Instruction,

and

Service

Manual

for

all

Mode1300A

Harmonic

Wave

Analyzers.

This

manual

contains

complete

operation

and

servicing

instructions

for

the

300A

and

may

used

place

thl~

Instruction

and

Operating

Manual

originally

supplied

with

each

ins

trument.

1956

Hewlett-Packard

Company

The

information

contained

this

booklet

intended

for

the

operation

and

main-

tenance

Hewlett-Packard

equipment

and

not

used

otherwise

reproduced

without

the

written

consent

the

Hewlett-

Packard

Company.

HEWLETT-PACKARD

COMPANY

PAGE

MILL

ROAD,

PALO

ALTO,

CALIFORNIA,

U.S.A.

MODEL

300A

HARMONIC

WAVE

ANALYZER

INSTRUCTION

OPERATING

MANUAL

TABLE

CONTENTS

SECTION

GENERAL

Page

1-1

1-2

GENERAL

DESCRIPTION

SPECIFICATIONS

• • • · . . . · . · .

· .

III

SECTION

OPERATING

INSTRUCTIONS

-1

23D

VOLT

OPERATION.

·· · ····· · · · •

III

-2

CONTROLS

TERMINALS

· · · ··· · · · · •

-3

OPERATION.

. . . .· · ·· · · · · · · • • · · · · ·

2-4

CALIBRATION

ADJUSTMENT

PROCEDURE.

···• •

-5

MEASUREMENT

PROCEDURE.

· · · · · •···

-6

MEASUREMENT

PRECAUTIONS.

·· · · · · · · · •V

2-7

SELECTIVITY.

. . .· · · · · · · · · · •V

SECTION

III

CIRCUIT

DESCRIPTION

3-1

GENERAL

••••

·.. . . . .. . . .... . .

SECTION

MAINTENANCE

4-1

CABINET

REMOVAL.

· · · · · ·· · · •· · •··

VII

4-2

TUBE

REPLACEMENT.

··········•·•·•·

VII

4-3

LOCAL

OSCILLATOR

AMPLITUDE

ADJUSTMENT.

•·

VII

4-4

VOLTAGE

REGULATOR

ADJUSTMENT.

· · • • • ·•·•

VII

4-5

HUM

BALANCE

ADJUSTMENT.

· · •·••••••••·

VII

4-6

BALANCED

MODULATOR

ADJUSTMENT.

•· · • • ·

VII

4-7

SELECTIVE

AMPLIFIER

ADJUSTMENT

· · •· · •·

VII

SECTION

TABLE

REPLACEABLE

PARTS

5-1

GENERAL.

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

VII

THE

ATTACHED

300A-2

SERVICE

MANUAL

HAS

SEPA-

RATE

INDEX

APPEARING

PAGE

III

INSTRUCTION

OPERATING

MANUAL

SECTION

GENERAL

1-1

GENERAL

DESCRIPTION

The

Model

300A

Harmonic

Wave

Analyzer

selective

voltmeter

designed

measure

the

individual

components

complex

waves.

The

selectivity

can

varied

means

selective

amplifiers

measure

either

closely

widely

spaced

harmonics.

The

instrument

cover

the

audio

spectrum

from

16,000

cps.

has

wide

voltage

range

that

full

scale

readings

may

ob-

tained

from

millivolt

500

volts

The

Model

300A

well

adapted

the

measurement

the

harmonic

distortion

audio

frequency

equipment

all

kinds,

broadcast

receivers,

transmitters;

determine

the

harmonic

components

machinery

and

power

systems;

the

study

induced

voltages

telephone

lines;

and

measurement

hum

components

rectifier

circuits.

Other

uses

include

the

study

noise

integrating

portions

the

spectrum

with

the

selectivity

control

adjusted

for

wide

pass

band

and

the

checking

wave

filter

characteristics

with

maximum

selectivity.

The

Model

300A

also

useful

device

measure

the

amount

cross

intermodulation

products

generated

the

simultaneous

transmis

sion

two

frequencies

audio

system

measure

demodulation

modulated

wave

applied

through

audio

system.

-2

SPECIFICATIONS

Complete

specifications

for

the

cEiJ

Model

300A

Harmonic

Wave

Analyzer

will

found

page

the

cEiJ

No.

300A-2

Service

Manual.

SECTION

OPERATING

INSTRUCTIONS

2-1

230

VOLT

OPERATION

This

instrument

shipped

from

the

factory

with

the

power

transformer

pri-

maries

connected

parallel

for

operation

from

115

volts.

operation

from

power

line

230

volts

desired,

the

power

transformer

primaries

must

connected

series

shown

the

"Transformer

Detail"

the

schematic

diagram

Fig.

page

the

No.

300A-2

Service

Manual.

Some

older

instruments

have

power

transformer

with

single

primary

wind-

ing

for

operation

from

115

volts

only.

The

ampere

slo-blo

fuse

required

for

115

volt

operation

must

replaced

0.6

ampere

slo-blo

fuse

after

changing

primary

connections

from

parallel

series

for

operation

from

230

vo.lts.

2-2

CONTROLS

AND

TERMINALS

All

controls

and

terminals

are

fully

des

cribed

pages

and

the

r5j:;

No.

300A-2

Service

ManuaL

CAUTION

THIS

INSTRUMENT

ACCURATE

AMBIENT

TEMPERATURES

APPROXIMATELY

DEGREES

FAHRENHEIT.

OTHER

AMBI-

ENT

TEMPERATURES

MAY

NECESSITATE

REALIGNMENT

THE

SELECTIVE

AMPLIFIER

SYSTEM.

2-3

OPERATION

The

operation

the

Model

300A

divided

into

two

parts.

the

calibration

adjustment

procedure

and

the

measurement

procedure.

2-4

CALIBRATION

ADJUSTMENT

PROCEDURE

This

procedure

will

found

under

the

heading

CALIBRATION

PROCE-

DURE

starting

page

the

r5j:;

No.

300A-2

Service

Manual.

See

the

important

operating

precautions

given

step

CALIBRA

TION

PROCEDURE

the

No.

300A-2

manual.

2-5

MEASUREMENT

PROCEDURE

The

instrument

must

calibrated

before

attempting

measurement.

the

following

procedure,

the

voltage

being

analyzed

has

fundamental

frequency

cps

and

amplitude

volts.

The

frequency

and

amplitude

this

hypothetical

voltage

have

been

sumed

simplify

the

instructions.

Any

voltage

between

millivolt

and

500

volts

any

frequency

between

16,

000

cps

could

similarly

measured.

harmonic

frequency

must

not

higher

'than

16.

000

cps

the

particular

harmonic

voltage

measured.

Calibrate

the

300A

previously

described.

Set

the

METER

MULTIPLIER

control

(XIOO)

and

the

SET

100

FOR

VOLT

AGE

MEASUREMENT

control

100.

Set

the

HALF

BAND

WIDTH

control

30.

See

step

26B

page

No.

300A-2

Service

Manual

regarding

the

degree

selectivity

neces-

sary

for

measuring

voltages

various

frequencies.

Set

the

frequency

dial

cps

and

peak

the

meter

indication

adjust-

ing

the

FINE

TUNING

control.

The

METER

SENSITIVITY

control

should

adjusted

give

readable

indication

the

millivoltmeter.

The

in-

strument

now

tuned

measure

the

amplitude

the

fundamental

fre-

quency

(80

cps)

with

the

harmonics

excluded.

The

actual

value

the

funda'mental

voltage

found

multiplying

the

millivoltmeter

indication

the

multiplying

factor

shown

the

position

the

METER

MULTIPLIER

control.

Example:

METER

SE.

SITIVITY

500

(5.

meter

scale)

full

scale

millivolts.

Meter

pointer

therefor

meter

actually

indicates

200

millivolts.

200

millivolts

100

(meter

multiplier

factor)

equal

20,

000

millivolts

volts.

2-5

MEASUREMENT

PROCEDURE

(Contld.)

£.

Turn

the

frequency

dial

160

cps

(second

harmonic

cps)

and

set

the

METER

SEl

SITIVITY

and

METER

MULTIPLIER

controls

obtain

read-

able

meter

indication.

Use

the

FINE

TUNING

control

peak

the

meter

indication.

The

meter

indication

times

the

meter

multiplying

factor

will

give

the

amplitude

the

second

harmonic.

Repeat

step

many

higher

harmonics

desired

until

the

harmonic

voltages

become

too

small

measure.

some

cases,

the

harmonic

fre-

quency

will

higher

than

16,

000

cps

which

will

outside

the

range

the

300A.

2-6

MEASUREMENT

PRECAUTIONS

The

results

obtained

with

the

300A

will

depend

upon

how

clos~ly

the

operator

follows

afew"

simple

but

very

important

operating

precautions.

These

pre-

cautions

are

given

step

PROCEDURE

FOR

CALIBRATION

page

300.1\-2

Service

Manual.

addition,

filter

should

used

between

the

voltage

measured

and

the

input

terminals

the

Model

300A

when

voltages

frequencies

are

being

measured.

This

filter

will

prevent

the

fourth

harmonic

the

volt3.ge

the

second

harmonic

the

voltage

from

entering

the

seJ.ective

amplifier

and

causing

erroneous

measur~ments.

2-7

SELEC

TIVITY

When

operati.ng

the

Model

300A,

should

borne

mind

that

the

instrument

frequency

selective,

wide

range

voltmeter

whose

selectivity

variable.

necessary

during

operation

determine

the

degree

selectivity

desired

and

adjust

the

instrument

correctly

obtain

that

degree

selectivity.

Determination

the

proper

selectivity

use

particular

measurement

should

primarily

based

the

fact

that

unwanted

voltages

must

attenu-

ated

the

selectivity

the

instrument

less

than

one

third

the

voltage

under

measurement.

This

attenuation

is,

turn,

dependent

upon

the

order

separation

unwanted

voltages

from

the

desired

voltage,

and

the

relative

magnitudes

the

various

voltages

involved.

Instrument

selectivity

controlled

the

HALF

BAND

WIDTH

control

which

calibrated

from

"30"

"145".

These

calibrations

indicate

the

frequency

separation

fr~m

the

center

frequency

which

the

selectivity

characteristics

the

instrument

attenuates

(99%).

Another

way

saying

the

same

thing

that

the

HALF

BAND

WIDTH

calibra-

tions

indicate

the

minimum

frequency

separation

from

100%

voltage

which

will

permit

accurate

measurement

voltage.

will

often

found

convenient

use

only

two

degrees

selectivity

ob-

tained

setting

the

HALF

BAND

WIDTH

control

"145"

for

minimum

2-7

SELECTIVITY

(Contld.)

selectivity

"30"

for

maximum

selectivity.

mlmmum

selectivity

for

voltages

with

fundamental

frequency

higher

than

100

300

cps.

Use

maximum

selectivity

for

voltages

with

fundamental

frequency

lower

than

100

300

cps.

This

system

eliminates

the

necessity

determining

whether

intermediate

degree

selectivity

offers

sufficient

attenuation

for

the

case

hand.

Occasionally,

however,

desirable

use

degrees

selectivity

which

are

intermediate

between

minimum

and

maximum.

example

follows

illus-

trate

typical

case

selectivity

determination.

Refer

Fig.

page

the

No.

300A-2

Service

Manual

which

shows

the

selectivity

characteristics

the

300A

for

the

two

extremes

the

HALF

BAND

WIDTH

control.

convenient

graph

for

converting

attenuation

terms

decibels

percentage

given

Fig.

page

the

No.

300A-2

Service

ManuaL

The

graphs

Figs.

and

are

used

determine

the

setting

the

HALF

BAND

WIDTH

control

illustrated

the

following:

sume

that

desired

measure

the

harmonics

cps

funda-

mental

and

that

harmonics

which

are

0.50/0

higher

are,of

interest.

Unwanted

voltages

must

attenuated

less

than

1/3

the

voltage

under

measurement

and

for

this

particular

case

would

1/3

1/20/0

1/6

10/0.

other

words,

when

measuring

the

second

harmonic,

the

funda-

mental

must

reduced

1/6

10/0

its

value

the

300A

selectivity

characteristics.

Referring

Fig.

see

that

1/6

equivalent

approximately

decibels.

Therefore,

the

HALF

BAND

WIDTH

con-

trol

must

adjusted

that

the

instrument

will

attenuate

decibels

for

frequency

separation

cps.

Refer

Fig.

and

sketch

curve

similar

the

two

curves

shown.

The

new

curve

should

pass

through

the

point

cps

off

resonance.

Note

the

point

where

the

new

curve

passes

the

line.

This

point

has

abscissa

about

cycles

off

resonance.

Therefore,

the

HALF

BAND

WIDTH

control

should

set

"50"

obtain

attenuation

cps

off

resonance.

The

instrument

must

then

calibrated

using

HALF

BAND

WIDTH

setting

"50"

instead

"30"

steps

through

PROCEDURE

FOR

CALIBRATION

page

No.

300A-2

Service

Manual.

See

step

26B

the

same

page

for

additional

information.

SECTION

III

CIRCUIT

DESCRIPTION

GENERAL

The

circuitry

the

rFeJ

Model

300A

Harmonic

Wave

Analyzer

discussed

pages

10,

and

the

(/!j)

No.

300A-2

Service

Manual.

•

VII

SECTION

MAINTENANCE

4-1

CABINET

REMOVAL

remove

the

instrument

from

the

cabinet

necessary

unscrew

the

eight

large

Phillips

head

screws

~he

control

panel

and

slide

the

instrument

forward

out

the

cabinet.

some

older

instruments,

may

necessary

remove

the

wire

connect-

ing

the

bottom

chassis

the

metal

plate

the

bottom

the

cabinet.

This

wire

will

found

the

rear

the

instrument.

4-2

TUBE

REPLACEMENT

Refer

page

Service

Manual

No.

300A-2

for

complete

instructions

tube

replacements.

4-3

LOCAL

OSCILLATOR

AMPLITUDE

ADJUSTMENT

This

adjustment

can

made

any

time

directed

step

PRELIMI-

NAR

TESTS

ADJUSTMENTS

page

No.

300A-2

Service

Manual.

4-4

VOLTAGE

REGULATOR

ADJUSTMENT

The

output

the

regulated

power

supply

section

the

300A

should

checked

from

time

directed

step

PRELIMINARY

TESTS

ADJUST-

MENTS

page

No.

300A-2

Service

Manual.

4-5

HUM

BALANCE

ADJUSTMENT

The

hum

balance

control

R159

located

the

bottom

deck

the

instrument

the

heater

transformer.

The

procedure

for

adjusting

this

control

given

FINAL

TEST

step

page

No.

300A-2

Service

Manual.

•

4-6

4-7

BALANCED

MODULATOR

ADJUSTMENT

The

procedure

for

adjusting

the

balanced

modulator

minimize

harmonic

distortion

given

page

No.

300A-2

Service

Manual

step

under

FINAL

TEST.

SELECTIVE

AMPLIFIER

ADJUSTMENT

The

detailed

procedure

for

adjusting

the

selective

amplifier

system

the

300A

given

pages

and

the

No.

300A-2

Service

Manual.

SECTION

TABLE

REPLACEABLE

PARTS

5-1

GENERAL

table

replaceable

parts

which

suitable

for

use

with

all

300A

instruments

given

the

No.

300A-2

Service

Manual.

This

table

begins

page

the

manual.

•

OPERATION

AND

SERVICE

MANUAL

FOR

MODEL

300A

HARMONIC

WAVE

ANALYZER

300A-2A

This

combined

Operation

and

Service

Manual

for

all

c5j;

Model

300A

Harmonic

Wave

Analyzers.

This

manual

contains

complete

operation

and

servicing

in-

structions

for

the

300A

and

may

used

place

the

Instruction

and

Operating

Manual

originally

sup-

plied

with

each

instrument

•

1955

Hewlett-Packard

Company

The

information

contained

this

booklet

intended

for

the

operation

and

main-

tenance

Hewlett-Packard

equipment

and

not

used

otherwise

reproduced

without

the

written

consent

the

Hewlett-

Packard

Company.

HEWLETT-PACKARD

COMPANY

275

PAGE

MILL

ROAD,

PALO

ALTO,

CALIFORNIA,

U.S.

300A002

Typical

Front

View

-hp-

Model

300A

Harmonic

Wave

Analyzer

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