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Adjustments
Model 8902A
Adjustment 7-15
kHz and >20 kHz Low-Pass Filter Gain
Reference
Service Sheet 12.
Description
A signal generator is amplitude modulated at a
1
kHz rate. The signal is demodulated by the Mea-
suring Receiver with no low-pass, audio filtering. Using the ratio feature, the demodulated signal is
referenced
to
1OOOh. The low-pass filtering is then set to >20 kHz and 15 kHz, then the filter gain
o f
each is adjusted for a reading of 100%.
Equipment
Signal Generator.
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H P 8640B
Procedure
1. Set the signal generator to 11 MHz at 0 dBm with
30%
AM at a 1 kHz rate. Connect its R F
output to the Measuring Receiver's INPUT. (The signal source can be connected either to a
sensor module o r directly to the Measuring Receiver's INPUT.)
2. On the Measuring Receiver, press the blue key then press INSTR PRESET (the AUTOMATIC
OPERATION key) to preset the instrument. Press AM. Set DETECTOR
to
AVG.
3.
Set RATIO on (with LOG/LIN set for a linear display). The display should show between 99.95
and
100.05%
REL.
4. Set
LP FILTER to >20 kHz. Adjust A2R44 (>20 kHz LPF GAIN)
f o r
a display
of
99.95 to
100.05% REL.
5. Set LP FILTER
to
15 kHz. Adjust A2R40 (15 kHz LPF GAIN)
f o r
a display of 99.95 to
100.05%
REL.
5-14
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