– AM example: With modulation depth 100%, when the modulating signal is at +5 V, the output will be at the
maximum amplitude. When the modulating signal at -5 V, the output will be at minimum amplitude.
– FM example: With deviation of 10 kHz, then a +5 V signal level corresponds to a 10 kHz increase in frequency.
Lower external signal levels produce less deviation and negative signal levels reduce the frequency below the carrier
frequency.
Front Panel Operations
After enabling Type AM or Type FM, select the modulating source as shown: Press MORE 1 / 2 > Source.
SCPI Command
[SOURce[1|2]:]AM:SOURce {INTernal|CH1|CH2}
[SOURce[1|2]:]FM:SOURce {INTernal|CH1|CH2}
Phase Modulation (PM)
A modulated waveform consists of a carrier waveform and a modulating waveform. PM is very similar to FM, but in
PM the phase of the modulated waveform is varied by the instantaneous voltage of the modulating waveform.
For more information on the fundamentals of Phase Modulation, see Modulation.
To Select Phase Modulation
– Only one modulation mode may be enabled at a time. Enabling PM disables the previous modulation mode.
– Enabling PM turns off sweep and burst.
Front Panel Operation
Press [Modulate] > Type AM > Type PM.
The waveform is output using the present carrier and modulating waveform settings.
Keysight EDU33210 Series User's Guide
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