Maximum Fm Deviation - Agilent Technologies 83620A Service Manual

21. Maximum FM Deviation

Description and Procedure
In this procedure, the synthesizer's RF output is monitored directly on a
spectrum analyzer for low FM rates. he FM amplitude is increased until the
maximum deviation exceeds the speci cation.
For higher FM rates, the FM rate is set so that a Bessel null occurs when the
RF peak deviation equals the speci cation. he modulation amplitude is
increased in order to pass through the correct Bessel null for the FM rate used
and the peak deviation speci ed.
1. Connect the equipment as shown in Figure 2-30. Preset all the instruments
and let them warm up for at least one hour.
Figure 2-30. Maximum FM Deviation Test etup
Spectrum Analyzer
Function Generator
Function Generator
2-124 Performance Tests
Maximum FM Deviation
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Equipment
HP 8566B
HP 3325A
HP 8111A or HP 8116A
HP 8360