HP 8901B Operation And Calibration Manual page 353

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
d B
or less).
FM Distortion at 10 kHz; 10 kHz Peak Deviation: 0.1%
Performance Test 2 4-13