HP 8901B Operation And Calibration Manual page 357

Model
8901B
Performance Tests
12.
Connect the audio analyzer's input to the Modulation Analyzer's MODULATION OUTPUT/
AUDIO
INPUT. (See Figure 4-3.) Set the audio analyzer
to
measure the distortion on the 1 kHz
signal at the MODULATION OUTPUT/AUDIO INPUT. Set the high-pass filter on the audio
analyzer to 400 Hz. The distortion should be 0.1% (-60
dB)
or less.
@M Distortion at 1
kHz Rate;
400 rad Peak Deviation; 1.5 MHz IF:
0.1%
13. Reduce the audio analyzer's oscillator level to give a display of 40 rad peak deviation.
14.
On the Modulation Analyzer, key in 3.1 SPCL. The distortion measured on the audio analyzer
should be 0.1% or less.
9 M Distortion at 1 kHz
Rate;
40 rad Peak Deviation; 455 kHz
IF:
0.1%
Performance Test 3
4-17