Model 8901B Performance Tests
Audio
Synthesizer
Frequency
(Hz)
10
000
20
27.
On the Modulation Analyzer, press FM. Set all
HP
FILTERs
to
off
and LP FILTER
to
>20 kHz.
28.
Set the audio synthesizer level for a Modulation Analyzer display of 10
kHz
peak deviation times
the calibration factor of step
4.
(For example, if the calibration factor of step
4
is
100.496,
set the
level for a display of
10.04
kHz.)
29.
Set the audio synthesizer to the frequencies shown in the following table. For each setting, the
Modulation Analyzer’s display should read between the limits indicated in the table.
FM
Limits
(kHz)
Lower Actual Upper
9.79
-
10.21
9.79
-
10.21
-
30. Set the audio analyzer’s oscillator
to
10
kHz
at
4V.
Connect its output
to
the audio input
of
the
AMFM test source. (See Figure
4-2.)
Fine adjust the oscillator level for a Modulation Analyzer
display
of 10
kHz
peak deviation.
31. Set the audio analyzer
to
measure the distortion on the
10
kHz
signal at the MODULATION
OUTPUT/AUDIO INPUT
of
the Modulation Analyzer. Set the distortion analyzer’s low-pass
filter
to
30
kHz
and the high-pass filter
to
400
Hz.
The distortion should be less than 0.1%
(-60
dB
or less).
FM Distortion at
10
kHz;
10
kHz
Peak Deviation:
0.1%
Performance Test
2
4-13
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