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Chapter 4 Remote Interface Reference
Frequency Modulation (FM) Commands
Frequency Modulation (FM) Commands
See also "Frequency Modulation" starting on page 72 in chapter 3.
FM Overview
The following is an overview of the steps required to generate an
FM waveform. The commands used for FM are listed on the next page.
1 Configure the carrier waveform.
Use the APPLy command or the equivalent FUNC, FREQ, VOLT, and
VOLT:OFFS commands to select the function, frequency, amplitude, and
offset of the carrier waveform. You can select a sine, square, ramp, or
arbitrary waveform for the carrier (pulse, noise, and dc are not allowed).
2 Select the modulation source.
The function generator will accept an internal or external modulation
source. Select the modulation source using the FM:SOUR command.
For an external source, you can skip steps 3 and 4 below.
3 Select the shape of the modulating waveform.
You can modulate the carrier with a sine, square, ramp, noise, or
arbitrary waveform (pulse and dc are not allowed). Use the FM:INT:FUNC
command to select the modulating waveshape.
4 Set the modulating frequency.
Set the modulating frequency to any value from 2 mHz to 20 kHz using
the FM:INT:FREQ command.
5 Set the peak frequency deviation.
Set the frequency deviation to any value from 5 Hz to 40.05 MHz
(limited to 550 kHz for ramps and 12.55 MHz for arbitrary waveforms)
using the FM:DEV command.
6 Enable FM modulation.
After you have set up the other modulation parameters, use the
FM:STAT ON command to enable FM.
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