Performance Tests
Model 8642A/B
PERFORMANCE TESTS
Set up measuring receiver as follows:
INSTRUMENT PRESET
MEASUREMENT MODE: FM
HP FILTER: ALL OFF
LP FILTER: ALL OFF
FM DE-EMPHASIS: OFF
Set up audio analyzer as follows:
INSTRUMENT PRESET
MEASUREMENT MODE: DISTN
HP/BPF FILTER: ALL OFF
LP FILTER: ALL OFF
FM Distortion Measurement
Set the HP 8642 to the modulation frequency, RF frequency, and
FM deviation given in the table below. Verify that the distortion
readings on the audio analyzer are less than the specified maximums
given in the table below.
MOD
FREQ
(kHz)
0.02
100
100
100
100
10
10
10
10
FREQ
(MHz)
8
1050
256
256
256
8
8
8
4
FM
(kHz)
1.35
100.0
25.0
187.0
375.0
0.781
5.85
11.7
93.8
Results
Actual Distn
Max.
4.0%
0.4%
0.4%
2.0%
4.0%
0.4%
2.0%
4.0%
4.0%
4-26
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