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Chapter 3 Features and Functions
Frequency Modulation (FM)
3
Frequency Modulation (FM)
A modulated waveform consists of a carrier waveform and a
modulating waveform. In FM, the frequency of the carrier is varied
by the instantaneous voltage of the modulating waveform.
For more information on the fundamentals of Frequency Modulation,
refer to chapter 7, “Tutorial”.
To Select FM Modulation
• The function generator will allow only one modulation mode to be
enabled at a time. For example, you cannot enable FM and AM at the
same time. When you enable FM, the previous modulation mode is
turned off.
• The function generator will not allow FM to be enabled at the same
time that sweep or burst is enabled. When you enable FM, the sweep
or burst mode is turned off.
• Front-Panel Operation: You must enable FM before setting up any of
the other modulation parameters. Press and then select “FM”
using the Type softkey. The FM waveform is output using the present
settings for the carrier frequency, modulating frequency, output
amplitude, and offset voltage.
• Remote Interface Operation: To avoid multiple waveform changes,
enable FM after you have set up the other modulation parameters.
FM:STATe {OFF|ON}
33210A users guide.book Page 77 Wednesday, July 16, 2008 11:16 AM
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