BRUEL & KJAER 1022 - Calibration Procedure; Using Output Terminals

BRUEL & KJAER 1022

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A.

Calibration.

1.

Snap

the

toggle

switch

marked

POvVER

to "

on"

and

allow

two

minutes

warm

up.

2.

MODULATION

FREQUENCY

and

COMPHESSOR

SPEED

to

their

"off"

position.

3.

Turn

main

scale

pointer

until

it

is

on

the

frequency

of

the

line

voltage

(e.g.

50

or

60

c/s),

checking

that

the

frequency

incremental

scale

is

on

zero.

If

not,

set

by

FREQUENCY

INCREMENT

knob

to

this

point.

4.

Set

suitable

deflection

on

the

:n1:eter

by

tuning

the

knob

marked

OUTPUT

LEVEL

to

higher

than

center

scale

reading.

5.

Press

POWEH

FHEQUENCY

BEAT

butlon

and

hold

to

"in"

po

,

sition

and

at

the

same

time

rotate

FHEQUENCY

SCALE

ADJUSTMENT

FINE

slowly,

until

a

large

fluctuation

registers

,

slows

up,

and

practically

ceases

on

the

meter

dial.

If

the

scale

is

widely

out

of

tune,

two

points

may

be

found

where

this

occurs,

only

one

of

which

is

correct

and

therefore

a

check

as

outlined

in

the

following

paragraph

should

be

carried

out,

firstly

releasing

the

POWEH

FREQUENCY

BEAT

button.

6.

Turn

the

main

scale

pointer

to

twice

the

mains

frequency

(100

or

120

c/s)

and

if

improperly

tuned

the

me:er

needle

will

drop

to

zero

indica

-

tion.

Then

FHEQUENCY

SCALE

ADJUSTMENT

FINE

must

be

re-aligned,

but

however,

if

the

other

zero

point

cannot

be

found

and

is

outside

the

range

of

the

FINE

control,

align

the

variable

capacitor

marked

COARSE

with

a

screwdriver

to

give

a

suitable

selling,

which

should

occur

al

some

point

between

4

and

6

on

FREQUENCY

SCALE

ADJUST-

MENT

FINE.

8.

Operation

Us

,

ing

the

Output

Terminals

Mark<'d

LOAD.

Apply

the

following

proceclure:

-

1.

Set-up

and

calibrate

the

oscillator

as

described

in

A.

2.

Place

the

MATCHING

IMPEDANCE

switch

in

a

suitable

position

for

the

application.

N.B.

Full

deflection

of

the

instrument

meter

corresponds

to

the

voltage

indicated

by

the

switch

position.

3.

Connect

the

load

to

the

output

terminals

marked

LOAD.

N.B.

Hight

terminal

is

grounded.

4.

Turn

the

pointer

on

the

main

frequency

dial

to

the

desired

frequency,

finely

adjusting

the

Frequency

Increment

if

necessary.

(For

automatic

frequency

sweep,

see

under

E).

5.

Select

a

suitable

output

voltage

hy

turning

the

knob

marked

OUTPUT

LEVEL.

14:

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