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16
Reference Graphs and Tables
Description of special functions 120 and 124
120: FM synthesis
This special function allows you to have the instrument synthesize the FM
signal in a digitized or linear manner. Digitized FM is best for signal-tone
modulation and provides very accurate center frequency at low deviation
rates. Linear FM is best for multi-tone modulation and provides a more
constant group delay than the Digitized FM.
124: FM Dly equalizer
This special function allows you to turn off FM delay equalizer circuitry. When
[ON] (The preset condition), 30 µsec of group delay is added to the FM
modulated signal to get better FM frequency response.
You may want to turn [OFF] the FM Delay Equalizer circuitry when the signal
generator is used as the VCO in a phase-locked loop application to reduce
phase shift, of when you want to extend the FM bandwidth to 200 kHz. When
[OFF], FM Indicator Accuracy is worse for rates of 1-5 kHz and better beyond
30 kHz. Refer to the 8665B User's Guide for specific details.
Agilent E5505A User's Guide
385
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