Fm Accuracy; External Fm - Agilent Technologies 83620A Service Manual

19. FM Accuracy

Description and Procedure
Use this procedure to measure the FM accuracy of the synthesizer. With the
synthesizer set to an FM sensitivity of 10 MHz/V, and the function generator
providing an FM modulation index of 2.404, the RF output should be a null.
he function generator amplitude is adjusted for the Bessel null and the
di erence between signals is recorded.
Since the modulation frequency for external FM is 1 MHz,
Note
this procedure relies on the voltage-setting accuracy of the
function generator (the frequency is too high for a DVM, and
an oscilloscope is not accurate enough.)

External FM

1. Connect the equipment as shown in Figure 2-28. Preset all instruments
and let them warm up for at least one hour.
Figure 2-28. FM Accuracy Test etup
2-114 Performance Tests
FM Accuracy
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