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BRUEL & KJAER 1023 - Adjustment Procedure; DC Voltage and Oscillator Calibration

BRUEL & KJAER 1023
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BRUEL & KJA:R
Nffirum
-
Denmark
Power:
"On"
Output
Voltage
to
"0"
Ref. Signal:
"Off"
Sweep
Control:
"Manual-Lin."
Modulation
Frequency:
"Off'
Counting
Time:
"0,1
s"
rear
Freq. Range Adj.:
"Full"
5.75
Adjustment Procedure
1023.3
If any
adjustment
is
found
necessary
the
voltages
from
the
stabilized
power
supply
should
be
checked as these are a basis
for
correct
adjustment.
However,
it
should
be taken
into
consideration
that
if
the
+
15.4
V
supply
is adjusted a
com-
plete
adjustment
procedure
of
the
item Frequency and Scale
must
be carried
out.
In
many
other
cases as
well,
adjustment
of
one
circuit
will
cause
the
necessity
of
other
ad-
justments.
Therefore
the
procedure is parted
into
main
sections
with
a
certain
order
which
must
be
followed
in
adjustment
as
well
as knob positions.
Throughout
the
measurements
the
common
lead
should
be connected to
ground
as close to
the
measuring
point
as
possible
in
order
to avoid
errors
due
to
currents
in
the
ground
wiring.
It should be noted
that
components
with
100
numbers
will
be
found
on Frequency Counter
ZD
0118,
200
numbers
on
Oscillator
Circuit
ZI
0032,
300
numbers
on
ZE
0151
while
all
400
numbers
are chassis
mounted.
DC
VOLTAGES
Remove top and
bottom
plate
of
the
instrument,
but
leave
the
circuit
boards
in
place.
-19V:!:O,6V
no
adjustment
o 0
Mains
Transformer
+19V±O,3
V
l&mV
±2mV
(see
text)
Check +
19
V ±
0,3
V and
adjust
P306
if
necessary.
-lS,4V!O,3V
no
adJ
ustment
Check
--19
V ±
0,6
V (no
adjustment
possibility,
but
affected
by
+
19
V).
Check +
15.4
V ±
30
mV
and adjust
P307
if
necessary.
Check
-15.4
V ±
0,3
V (no
adjustment
possibility,
but
affected by +
15,4
V).
Check + 5 V.±
0,25
Von
the
supply rail on
the
Frequency
Counter
board.
Connect
the
Voltmeter
to
the
two
resistors as
shown
and
adjust
P305
if
necessary for
16
mV
± 2
mV
(avoid a
common
ground
connection
between
1023
and
the
Voltmeter).
Connect the
Voltmeter
to
the
"Load"
terminals
and
adjust
P304
for
0 V ±
10
mV.
FIXED AND VARIABLE OSCILLATORS
The Fixed
Oscillator
is Crystal
controlled
and
not
adjustable,
while
the
Variable Oscillator is a
voltage controlled
LC
oscillator
where
the
adjustment
of
L
determines
only
the
range
of
the
oscillator. and
not
the
output
frequency and stability.
Thus
the
following
procedure
for
adjusting
the
range of
the
VCO
should
be used
only
if
a
fault
has been repaired
in
one
of
the
two
oscillators.
Position
the
instrument
on its
right
end
with
the
front
towards
the
operator and
ZI
0032
swung
out
on
the
table.
Connect
a Frequency Counter
to
"Fixed
Osc."
socket on
the
rear
panel and
chec~
the
fre-
quency
to
be
120
kHz ± 5 Hz.
Turn
P208
fully
clockwise
(from
component
side)
in
order
to enable a Frequency Display be-
low
5Hz.
Connect
a DiWital
Voltmeter
to
ES2
point
on
ZI
0032.
Turn
Frequency Dial
down
to approx. 0
Hz
on
the
Lin. Scale, and
fineadjust
for
0 - 2
Hz
on
the
Digital Frequency Display (Use Scale
Alignment
for
fineadjustment).
The
DVM
should
now
read 8 V ±
50
mV
and
if
not
adjust
L201
from
the
bottom
side
of
ZI
0032
to
such a
position
where
8 V ±
50
mV
is
obtained on
the
DVM
with
0 - 2 Hz on the
Digital Display. (Fineadjust Frequency Dial and Scale
Alignment
if
necessary).
Valid
from
serial no.
523774"
3-1

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