BRUEL & KJAER 1022 - Remote Control Operations

BRUEL & KJAER 1022

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lt is

also

possible

to

obtain

different

regulation

characteristics

dependent

on

the

position

of

the

potentiometer

marked

OUTPUT

LEVEL.

This

can

be

seen

from

Fig.

1.2.

Remote Control.

In

the

main

description

of

the

apparatus

several

forms

of

remote

control

are

mentioned.

To

carry

out

any

one

of

these

methods

use

must

be

made

of

the

REMOTE

CONTROL

jack

on

th

e

front

panel,

the

appropriate

connections

being

made

to

the

pins

of

the

six-poled

socket.

Fig.

2.5

shows

the

different

pins

on

the

socket.

Oscillator Stop

(+100

Volts

d.c

. approx.)

Internal

Contact

External

Modulation

a

Ground

Magnetic

Clutch

Fig. 2.5.

RE

1

UOTE

CONTROL

jack,

viewed

l

ooking

towards

front

panel.

Remote

control

of

the

magnetic

clutch

can

be

obtained

by

making

or

breaking

a

connection

between

a

and

f,

providing

the

clutch

control

switch

AUTO-

MATIC

SCANNING

is

at

the

position

"off".

For

ex

t

erna

l

modulation

one

may

connect

the

externa

l

generator

between

chass

is

and

terminal

b,

having

the

MODULATION

FREQUENCY

switch

set

to

position

"Ext.

Mod.",

but

it

is

also

possible

to

use

f

as

chassis

connection.

For

remote

interruption

of

the

output

signal

(s

topping

of

the

fixed

oscillator)

the

terminal

c

shou

ld

be

connected

to

terminal

f

(ground).

This

arrangement

is ·

used,

for

instance,

when

reverberation

measurements

are

carried

out

automatica

lly

by

employing

the

B & K

Level

Recorder

Type

2305. A

special

switch

in

the

Recorder

then

connects

terminal

c

to

ground

when

the

radiated

signal

has

to

be

interrupted.

Termina

ls d

and

e

are

in

connec

ti

on

with

an

internal

contact

used

for

inter-

rup

.

ting

the

signa

l

output

when

th

e

frequency

sca

le

pointer

is

outside

the

sca

le.

Note:

When

de

li

vered

from

the

factory,

each

B.

F.O.

is

supplied

with

a

6-pol

ed

plug

containing

the

necessary

connections

for

the

function

of

the

internal

contact.

20

•