4 Remote Interface Reference
212 Keysight 33210A User’s Guide
FM Commands
FM:SOURce {INTernal|EXTernal}
FM:SOURce?
Select the source of the modulating signal. The function generator will accept an
internal or external modulation source. The default is INT. The :SOUR? query
returns “INT” or “EXT”.
–If you select the External source, the carrier waveform is modulated with an
external waveform. The frequency deviation is controlled by the ±5V signal
level present on the rear-panel Modulation In connector. For example, if you
have set the deviation to 100 kHz using the FM:DEV command, 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:INTernal
:FUNCtion {SINusoid|SQUare|RAMP|NRAMp|TRIangle|NOISe|USER}
:FUNCtion?
Select the shape of the modulating waveform. Used only when the
Internal
modulation source is selected (
FM:SOUR INT
command). You can
use noise as the
modulating waveshape, but you cannot use ramp, noise, pulse, dc, or arbitrary as
the carrier waveform. The default is SIN. The :FUNC? query returns “SIN”, “SQU”,
“RAMP”, “NRAM”, “TRI”, “NOIS”, or “USER”.
– Select “SQU” for a square waveform with a 50% duty cycle.
– Select “RAMP” for a ramp waveform with 100% symmetry.
– Select “TRI” for a ramp waveform with 50% symmetry.
– Select “NRAM” (negative ramp) for a ramp waveform
with 0% symmetry.
Use the APPLy command or the equivalent FUNC, FREQ, VOLT, and VOLT:OFFS
commands to configure the carrier waveform.
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