Fluke 96000 Series Service Manual page 119

For accurate FM measurements the measuring receiver's setting
demodulation bandwidth setting must be >3 x {rate + deviation}. In
order to meet this requirement at higher rate and deviation
frequencies the demodulation bandwidth setting must be increased
from the default automatically configured in the modulation
measurement mode.
13. Set the UUT FM rate to 300 kHz and the deviation to 1 MHz. Repeat steps
11 and 12.
Frequency
62.5 MHz
14. Set the UUT as follows:
Frequency
Level
Mod Rate
FM Deviation
Output
Modulation
15. Use the Measuring Receiver autotune feature to tune to the input signal
and when tuning is complete set the UUT to Modulation ON.
16. Measure the FM deviation. Verify that the measured deviation is within the
tolerance listed in Table 3-34.
17. Repeat step 16 for the remaining FM deviation test points listed in
Table 3-34. When setting a new carrier frequency select MODULATION
OFF and repeat step 15 prior to repeating step 16.
Table 3-34. Microwave Output FM Deviation Test
Frequency
125 MHz
1 GHz
Note
Table 3-33. Microwave Output FM Rate Test
Modulation
Deviation
Rate
400 Hz 300 kHz
300kHz 1MHz
125 MHz
+13 dBm
400 Hz (Sine)
30 kHz
OPER
OFF
Modulation
Deviation
Rate
100 kHz
400 Hz
100 kHz
100 kHz
300 kHz
400 Hz
300 kHz
100 kHz
1 MHz
400 Hz
1 MHz
300 kHz
Performance Tests
Tolerance
399.990 Hz to 400.010 Hz
299.990 Hz to 300.010 kHz
Tolerance
99.70 kHz – 100.30 kHz
99.70 kHz – 100.30 kHz
309.0 kHz – 291.0 kHz
309.0 kHz – 291.0 kHz
1.030 MHz – 0.970 MHz
1.030 MHz – 0.970 MHz
3
Performance Test
3-77