FM Commands
Use the APPLy command or the equivalent FUNC:SHAP, FREQ, VOLT,
and VOLT:OFFS commands to configure the carrier waveform. Set the
carrier frequency between 10 mHz and 15 MHz (100 kHz for triangle
and ramp). The default is 1 kHz.
FM:DEViation {<
peak deviation in Hz>|MINimum|MAXimum}
Set the peak frequency deviation in hertz. This value represents the
variation in frequency of the modulating waveform from the carrier
frequency. Select from 10 mHz to 7.5 MHz. The default is 100 Hz.
MIN = 10 mHz. MAX = 7.5 MHz. [ Stored in volatile memory ]
The carrier frequency must always be greater than or equal to the
peak frequency deviation. If you attempt to set the deviation to a
value greater than the carrier frequency (with
FM enabled), the
function generator will automatically adjust the deviation to equal
the present carrier frequency. From the remote interface, a -221,
“Settings conflict” error is generated and the deviation is adjusted.
The sum of the carrier frequency and peak frequency deviation must
be less than or equal to the maximum frequency for the selected
function
plus 100 kHz (15.1 MHz for sine and square, 200 kHz for
triangle and ramp, and 5.1 MHz for arbitrary waveforms). If you
attempt to set the deviation to a value that is not valid, the function
generator will automatically adjust the deviation to the maximum
value allowed with the present carrier frequency. From the remote
interface, a -221, “Settings conflict” error is generated and the
deviation is adjusted.
FM:DEViation? [MINimum|MAXimum]
Query the peak frequency deviation. Returns a value in hertz.
Chapter 4 Remote Interface Reference
FM Modulation Commands
158
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