Fluke 96000 Series - Page 119

Performance Tests
Performance Test 3
3-77
Note
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.
Table 3-33. Microwave Output FM Rate Test
Frequency
Modulation
Rate
Deviation Tolerance
62.5 MHz 400 Hz 300 kHz 399.990 Hz to 400.010 Hz
300kHz 1MHz 299.990 Hz to 300.010 kHz
14. Set the UUT as follows:
Frequency 125 MHz
Level +13 dBm
Mod Rate 400 Hz (Sine)
FM Deviation 30 kHz
Output OPER
Modulation OFF
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
Modulation
Rate
Deviation Tolerance
125 MHz
400 Hz 100 kHz 99.70 kHz – 100.30 kHz
100 kHz 100 kHz 99.70 kHz – 100.30 kHz
400 Hz 300 kHz 309.0 kHz – 291.0 kHz
100 kHz 300 kHz 309.0 kHz – 291.0 kHz
1 GHz
400 Hz 1 MHz 1.030 MHz – 0.970 MHz
300 kHz 1 MHz 1.030 MHz – 0.970 MHz