Set the peak frequency deviation in Hertz. This value represents the peak
variation in frequency of the modulated waveform from the carrier
frequency. The :PM[1|2]:DEV? query returns the deviation in Hertz. The
carrier frequency must always be greater than or equal to the deviation.
If you attempt to set the deviation to a value greater than the carrier
frequency (with FM enabled), the instrument will automatically adjust the
deviation to the maximum value allowed with the present carrier frequency.
From the remote interface, a “Data out of range” error will be generated and
the deviation will be adjusted as described.
If you select the External modulating source (FM[1|2]:SOUR EXT
command), the deviation is controlled by the ±2.5V/±5V signal level present
on the rear panel Modulation In connector.
For example, if you have set the frequency deviation to 100 kHz, then a
+2.5V/+5V signal level corresponds to a 100 kHz increase in frequency.
Lower external signal levels produce less deviation and negative signal
levels reduce the frequency below the carrier frequency.
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