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BRUEL & KJAER 1621 - Adjustment Procedure; Power Supply; Frequency Tuning Voltage; DC-Off-set Adjustment

BRUEL & KJAER 1621
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BRUEL & KJA:R
Ncerum
Denmark
Power
Supply
FilTER:
"linear"
INTERNAl BATIERY
Frequency
Tuning
Volta
ge
FILTER:
"Linear"
FREQUENCY TUNING
"r
SWEEP
CONTROl
"Manual"
DC-Off-set
Adjustment
FILTER
"23%"
FREQUENCY TUNING
"20"
SWEEP
CONTROl
"Manual"
Adjustment Procedure
1621.2
Check the
following
voltages and adjust if necessary.
+
12V
±0,3V
DC.
(P113)
+
lOV
±O,l
V DC.
(Pl11)
~10V
,,0,1
V DC.
(P112)
Remove
the
connection
between
P3 and
R26
on
lE
0161.
(Marked
'F'
on
the
P.
C board)
Adjust
the voltage on
the
slider
of
P3:
-1.20V
=
0,05
V
Reconnect P3 to
R26.
Check the voltage across
P120
FREQUENCY TUNING:
66
mV ± 2 mV
If necessary
adjust
P 1 O
Check if the voltages are
OV
0,2
mV
DC
between
ground
on
lE
0161
and
the
following
components (pin
2)
Component
V16
V15
V6
V12
If necessary ad]ust
P4
P6
P9
P8
Amplitude
Controi
FilTER to
"Linear"
FREQUENCY RANGE
"2002K"
FREQUENCY TUNING:
"10"
MAX.
VOLTAGE:
"1
V"
SWEEP
CONTROl'
"Manual"
FILTER
to
..
3%"
FREQUENCY RANGE to
"2k-20k"
FilTER to
"Z3%"
Frequency
Control,
Manual
FilTER
"3%"
FREOUENCY RANGE
"ZO-200"
FREQUENCY TUNING
"2"
MAX.
VOLTAGE:
"1
V"
SWEEP CONTROL'
"Manual"
FREQUENCY TUNING to
"20"
FREQUENCY TUNING to
"2"
9.77
Check the voltage
between
pin 2 and 3 on
V17:
O V ±
0,2
mV.
If
necessary
ad]
ust P 1 .
Input
signal to
"Filter
Input";
1000
Hz
adjusted
for
1 V
deflection
on an electronic voltmeter
connected to
"Filter
Output"
Fine adJust FREQUENCY TUNING
for
maximum
output
voltage.
Deflection:
1 V ±
O,6dB.
If necessary adjust P
114.
(lG
0109)
C~ange
signal frequency to
10kHz
and check the
output
voltage
Deflection:l
V
0,6
dB.
If necessary
adjust
Pl15.
(ZG
0109)
For
the
positions
of
FREQUENCY RANGE
"0.2·Z",
"Z-20",
"ZO-200"
the tolerances are
±
O,6dB,
but
no adJustments.
Check as above.
Tolerance'
0,3
dB
0,6
dB
in"2
k
20
k"range
Input
signal:
20
Hz
0,01
Hz
• 1 V
Fine
adjust
FREQUENCY TUNING
for
maximum
output,
voltage
loosen
the
knob and
turn
the
pointer
to position 2.
Change signal frequency to
200
Hz
0,1
Hz
Adjust
P5
{ZE
0161)
for max.
output
voltage
Repeat
the
above adJustments
as
they
influence
e8ch
olhers
Check the frequency
for
the
other
positions
of
FREOUENCY
RAt'<GE.
Tolerance: ± 1%
In
the
rango"Zk-20k'
the frequency can be
adjusled
by
C
118.
(ZG
0109).
Valid from serial no.
6941Z6
-
2-1

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