BRUEL & KJAER 1022 - Acoustical Measurement Applications

BRUEL & KJAER 1022

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Due

to

the

selectivity

of

the

Frequency

Analyzer

it

is

well-suited

as

an

indicating

instrument

in

a

bridge

circuit.

The

clc

·

nel

scale

on

the

instru-

ment

meter

will

often

prove

useful

whe1• :.

i~

Jt~:~ed

to

measure

the

quality

of

different

components

plared

within

t:.e

bridge.

Measurement

of

Gain in A.F.

Amplifh

t•s.

The

measurement

of

distortion

and

frequency

response

of

A.

F.

amplifiers

may

be

carried

out

in

the

same

manner

as

for

four-terminal

networks

,

the

description

for

the

arrangement

being

given

in

the

initial

paragraph

to

this

section.

D D 0 · D 0 D D D 0 0 D D 0 D n [J 0 0 0 0 0 0 U 0

[J

0 0 D 0 0 0

lJ

0 0 0 0 0 0 I l 0

[l

0

.........

10

100

1000 10000

r-'

i-

10

7S

0 0

160559

Fig. 3.4b.

Recording

of

the

frequency

characteristic

of

loudspeaker

mounted

in

a cabinet.

(The

measurement

was

not

carried

out

in

a

completely

dead

room

,

and

the

effect

of

reflections

can

be seen

from

the

recording).

Frequently

it

is

important

to

check

the

linearity

of

an

amplifier

i.e. to

measure

the

gain

for

different

values

of

input

voltage.

As

the

aHenualor

circuit

of

the

Beat

Frequency

Oscillator

Type

1022 is

very

accurately

cali-

brated

it

is

an

extremely

useful

instrument.

in

carrying

out

gain

measure

-

ments.

The

o:

utput

voltage

from

the

amplifier

under

test

should

be

measured

with

an

Audio

Frequency

Voltmeter

Type

2409

(or

2410),

or

a

Microphone

Amplifier

Type

2603 (

or

Type

2604)

an

example

of

the

arrangement

being

given

in

Fig.

3.3.

25