BRUEL & KJAER 1022 - Using the Built-in Attenuator; Frequency Modulation

BRUEL & KJAER 1022

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,

C.

Operation

Using

the

Built-in

Attenuator.

Apply

the

following

procedure:

-

1.

Set-up

and

calibrate

the

oscillator

as

described

in

A.

2.

Set

the

MATCHING

IMPEDANCE

switch

in

the

position

"AU.".

3.

Select

the

appropriate

voltage

range

by

means

of

A

TTEN

U A

TOR.

N.B.

Full

deflection

of

the

instrument

meter

corresponds

to

the

voltage

indicated

by

the

switch

position.

4.

Connect

the

load

to

the

screened

output

socket

on

the

top

of

the

instru

-

m.

ent

marked

ATTENUATOR

O

UT

PUT.

5.

Proceed

as

in

B. 4

and

5.

D.

Frequency

Modulation.

When

a

frequency

modulated

output

signal

is

required,

the

following

proce

;

dure

should

be

adopted:-

·

.f

..

0

,.,_..,.

1.

Turn

the

knob

marked

MODULATION

FREQUENCY

to

the

requir

'

ed

frequency

.

2.

Turn

the

knob

marked

FREQUENCY

DEVIATION

to

zero.

3.

Re-calibrate

the

Oscillator

as

described

in

A,

omitting

to

turn

TION

FHEQUENCY

to

"off"

position.

MODULA- ·

0 f

4.

Set

the

FREQUENCY

DEVIATION

knob

to

the

required

bandwidth.

5.

Proceed

as

described

in

B

items

2 to 5,

or

C

items

2 to 5,

dependent

on

the

requirement.

2305

Object

under

test

.

~

':

~

:~-~

:

.

-

:

~

:·

..

~

~-

;:

!

·:

·

:

-

~

!

-

.:

·

~-

!

~

·

:

·

1022

Fig. 2.2.

Example

of

mechanically

connecting

the

B.F.O. 1022 to

Level

Recorder

Type

2305.

15