HP 8642A - Page 276

Performance Tests
4-26
PERFORMANCE TESTS
Set up measuring receiver as follows:
INSTR
UMENT PRESET
MEASUREMENT MODE:
HP FILTER:
LP FILTER:
FM DE-EMPHASIS:
Set
up audio analyzer as follows:
INSTR
UMENT PRESET
MEASUREMENT MODE:
HP JBPF FILTER:
LP FILTER:
2. FM Distortion Measurement
FM
ALL OFF
ALL OFF
OFF
DlSTN
ALL OFF
ALL OFF
Model 8642AjB
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 FM
Results
FREQ
(MHz)
(kHz)
(kHz)
Actual Distn Max.
0.02 8 1.35
4.0%
100 1050 100.0 0.4%
100
256
25.0 0.4%
100 256 187.0
2.0%
100
256 375.0
4.0%
10
8
0.781 0.4%
10 8 5.85 2.0%
10
8
11.7 4.0%
10
4 93.8
4.0%