195
Chapter 4 Remote Interface Reference
Frequency Modulation (FM) Commands
4
• If you select an arbitrary waveform as the modulating waveshape
(“USER”), the waveform is automatically limited to 4K points.
Extra waveform points are removed using decimation.
Note:
Arbitrary waveforms are optionally available with the 33210A
(Option 002). To upgrade your 33210A to include arbitrary waveform
functionality, go to
www.
keysight
.com/find/33210U
.
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
peak variation in frequency of the modulated waveform from the carrier
frequency. Select any value from 1 mHz to 5 MHz
. The default is 100 Hz
.
MIN = 1 mHz. MAX = based on the frequency of the carrier waveform as
shown below. The :DEV? query returns the deviation in hertz.
Max. Deviation =
For Carrier < 5 MHz
Max. Deviation =
For Carrier > 5 MHz
• 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
ad
just
ed as described.
2
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33210A users guide.book Page 195 Wednesday, July 16, 2008 11:16 AM
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