BRUEL & KJAER 1022 - Troubleshooting and Accessories; Trouble Shooting Guide; Output Transformer TU 0005

BRUEL & KJAER 1022

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Trouble

Shooting.

If

tl.e

B.F.O.

is

not

working

properly

when

switched

on,

check

the

follow-

ing:-

1.

That

scale-pointer

is

not

situated

in

the

uncalibrated

section

of

th

e

main

dial,

i.e.

between

20ooo

c/s

and

20

c/ s.

'2.

That

scale-pointer

is

not

en

a

section

chosen

for

"partia

l

blocking

nf

frequency

range

",

sec

pages

9

and

10.

Accessories

Output

Transformer

TU 0005.

This

transformer

is

designed

to

allow

symmetrical

output

from

the

ai:tenu-

Htor

output

of

the

B.F.O.

1022.

(Symmetry

better

than

o.1 %).

The

output

impedance

is 600 Q

and

the

distortion

0.5 %

at

20 c/s

with

maximum

output

voltage

from

the

B.F.O.

(12.5

V)

.

The

accuracy

of

the

Transformer

is ± o.2

dB

in

the

frequency

range

10

, c/s to 35

kc

/s.

In

addition

a

core

material

has

been

chosen

for

the

transformer,

which

makes

it

possible

to

"preload"

the

secondary

winding

with

a

current

of

100

rnA

without

causing

additional

distortion

for

frequencies

above

300 c/s.

The

transformer

ratio

is

y10

: 1.

The

voltage

transmis

,

sion

loss

of

the

transfonmer

when

loatled

by

600 Q is

approximately

16

dB.

21