HP 8642A

Model 8642A/B
rev.12DEC86
Performance Tests
PERFORMANCE TESTS
7. FM Indica ted Accuracy
Preset instruments. Set the HP 8642 amplitude to +10 dBm. Set the
measuring receiver to FM mode with all filters off. Set the HP 8642
modulation frequency, RF frequency, and FM deviation to the
values given in the table below and verify that the FM deviation
readings on the measuring receiver are within the specified limits.
MOD
FREQ
FM
Results
FREQ
(MHz)
(kHz)
(kHz)
Min. Actual FM Max.
0.02
8
1.35
1.28 kHz
1.42 kHz
100
1050
100.0 95.0 kHz 105.0 kHz
100 256
25.0 23.7 kHz
26.3 kHz
100
256
187.0 177.6 kHz 196.4 kHz
100
256 375.0
356.2 kHz
393.8 kHz
10
8
0.781 0.732 kHz 0.830 kHz
10
8 5.85 5.55 kHz 6.15 kHz
10
8
11.7
11.1 kHz 12.3 kHz
10
4 93.8 89.1 kHz 98.5 kHz
8. Incidental AM
Set the measuring receiver to AM mode with 50 Hz high pass filter, 3
kHz low pass filter, and the PEAK + detector selected. On the HP
8642, set FM to Off, and set the frequency to 100, 1050, and 1300
MHz (1300 for 8642B only). The measuring receiver's reading must
be less than 0.02% at these frequencies. If the reading is too high, it
means the residual AM of the measuring receiver (or possibly of the
HP 8642) is too high to make the incidental AM measurement.
Determine the cause of the high residual AM before proceeding. If
the reading is less than 0.02%, set the HP 8642 to FM to 20 kHz
deviation and modulation frequency to 1 kHz. Set the HP 8642
frequency to the settings in the table below and verify that the
measuring receiver readings are less than the specified maximum.
FREQ
Results
(MHz)
Actual
Max.
100.0
0.30%
1050.0
0.30%
1300.0
0.30%
4-23