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Chapter 4 Remote Interface Reference
Amplitude Modulation (AM) Commands
4
Amplitude Modulation (AM) Commands
See also “Amplitude Modulation” starting on page 72 in chapter 3.
AM Overview
The following is an overview of the steps required to generate an
AM waveform. The commands used for AM 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 or square waveform
for the carrier (ramp, pulse, noise, dc, and arbitrary 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 AM: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
AM: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 AM:INT:FREQ command.
5 Set the modulation depth.
Set the modulation depth (also called “percent modulation”) to any value
from 0% to 120% using the AM:DEPT command.
6 Enable AM modulation.
After you have set up the other modulation parameters, use the
AM:STAT ON command to enable AM.
33210A users guide.book Page 189 Wednesday, July 16, 2008 11:16 AM
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