4 Remote Interface Reference
214 Keysight 33210A User’s Guide
–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
(10.1 MHz for
sine and square 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.
– If the deviation causes the carrier waveform to exceed a frequency boundary
for the current duty cycle (square waveform only), the function generator will
automatically adjust the duty cycle to the maximum value allowed with the
present carrier frequency. From the remote interface, a “Settings conflict” error
will be generated and the duty cycle will be adjusted as described.
–
If you select the
External
modulating source (
FM:SOUR EXT
command
), the
deviation is controlled by the ±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 +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.
FM:STATe {OFF|ON}
FM:STATe?
Disable or enable FM. To avoid multiple waveform changes, you can enable
FM after you have set up the other modulation parameters. The default is OFF.
The :STAT? query returns “0” (OFF) or “1” (ON).
– The function generator will allow only one modulation mode to be enabled at a
time. For example, you cannot enable FM and AM at the same time. When you
enable FM, the previous modulation mode is turned off.
– The function generator will not allow FM to be enabled at the same time that
sweep or burst is enabled. When you enable FM, the sweep or burst mode is
turned off.
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