BROEL
&
KJ.ER
NCllrum
- Denmark
Oscillator
1024.3
valid
from
serial
no.
131481
sheet 1
100-120kH, V
~12JkH'
-
~
08
0
~
~
OE
Or
~
~
OA
00
~
0
V1
Flg.1 Oscillator
cOIL
Assembly
ZS
0113
Attention: Item
3.1
-
3.2
-
3.3
-
3.4
-
3.6
and
3.9can
only
be
checked and adjusted by means
of
a frequency counter
e<
on oscilloscope and a frequency standard . (The voltages should
be
measured
by
means
of
a high impedance
(low
capacity)
tube
voltmeter.
3.1.
Fixed Oscillate<
FREQ. INCREMENT: "0"
3.2.
Variable Oscillator
MATCHING
IMP
, :
"60"
COMPRESSOR
SPEED:
"Compo Off"
SWITCH
07:
'Sc
anning
Off"
BANDWIDTH
SELECTOR:
'Sine"
METER
SWITCH:
'0.3
,ec.
Output
Volt."
FREQ.SCALEALIGN,FINE: "Center PO$iiion"
FREQ,
SCALE
ALIGN.
COARSE:
"Center P05Jtion"
FREQUENCY
SCALE:
"20 Hz"
b. FREQUENCY
SCALE
tQ
"20000 Hz"
1024.3
-
1.65
Adjust the oir trimmer
,"0
W
Fig
. 1) for 123 kHz t 10
Hz.
on
the
socket
·123
kHz".
Adjust only the iron
core
("C" Fig. 1) if the regul
ation
range
of
the
oir trim-
mer
is
too narrow.
Adjust
the iron
core
of
Z 10
to
min.
voltage
on
the
"123 kHz"
socket.
The
voltage should
be
170 - 240
mV
.
Adjust the air trimmer
(liB
Fig . 1)
for
20
Hz
at
the
LOAD
terminals.
Voltage on the "100-120 kHz socket shou
ld
be 160-250 mV.
Adiust the iron
core
(lie"
Fig.
I)
for 20000
Hz
at
the
LOAD
terminals.
Check a - b again
and readjust
if
necessary .
If
the pointer
has
been removed
.,
set the condenser
to
fully "turned in
ll
p::tsi-
tion.
The
posi tion
of
the condenser is checked with a
plate
of
insulating
ma-
terial which strokes over the stator plates so
that
none
of
the rota- plates
is
above the stator plates. Make a degree
scale
with 1020
at
20
Hz
and 3180
at
20000
Hz
and fi x
the
poi nter
at
3200 .
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