Agilent Technologies 33250A User Manual page 174

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Chapter 4 Remote Interface Reference
Frequency Modulation (FM) Commands
FM:INTernal:FREQuency {<frequency>|MINimum|MAXimum}
FM:INTernal:FREQuency? [MINimum|MAXimum]
Set the frequency of the modulating waveform. Used only when the
Internal modulation source is selected (FM:SOUR INT command).
Select from 2 mHz to 20 kHz. The default is 10 Hz. MIN = 2 mHz.
MAX = 20 kHz. The :FREQ? query returns the internal modulating
frequency in hertz.
FM:DEViation {<peak deviation in Hz>|MINimum|MAXimum}
FM:DEViation? [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 any value from 5 Hz to 40.05 MHz (limited to 550 kHz
for ramps and 12.55 MHz for arbitrary waveforms). The default is 100 Hz.
MIN = 5 Hz. MAX = based on the frequency of the carrier waveform as
shown below. The :DEV? query returns the deviation in hertz.
Carrier
Max. Deviation = ------------------- -
Max. Frequency – Carrier
Max. Deviation = ----------------------------------------------------------------------- -
• 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 function generator 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.
• The sum of the carrier frequency and deviation must be less than or
equal to the maximum frequency for the selected function plus 100 kHz
(80.1 MHz for sine and square, 1.1 MHz for ramp, and 25.1 MHz for
arbitrary waveforms). If you attempt to set the deviation to a value
that is not valid, the function generator will automatically adjust it 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.
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For Carrier < 40 MHz
For Carrier > 40 MHz