Keysight 33210A, User Manual

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Chapter 4 Remote Interface Reference
Frequency Modulation (FM) Commands
4
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.
33210A users guide.book Page 194 Wednesday, July 16, 2008 11:16 AM