258 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
20 Waveform Generator
You can enable modulation for all waveform generator function types except
arbitrary, square, pulse, DC, noise, and Gaussian pulse.
• From the Type drop-down list, select the modulation type:
• Amplitude Modulation (AM) — the amplitude of the original carrier signal is
modified according to the amplitude of the modulating signal. See
"To
set up Amplitude Modulation (AM)"
on page 258.
• Frequency Modulation (FM) — the frequency of the original carrier signal is
modified according to the amplitude of the modulating signal. See
"To
set up Frequency Modulation (FM)" on page 259.
To set up Amplitude Modulation (AM)
In the Modulation dialog box when Amplitude Modulation (AM) is selected:
1 From the Waveform drop-down list, select the shape of the modulating signal:
• Sine
2 In the AM Freq field, enter the frequency of the modulating signal.
3 In the AM Depth field, enter the amount of amplitude modulation.
AM Depth refers to the portion of the amplitude range that will be used by the
modulation. For example, a depth setting of 80% causes the output amplitude
to vary from 10% to 90% (90% – 10% = 80%) of the original amplitude as the
modulating signal goes from its minimum to maximum amplitude.
The following screen shows an AM modulation of a 100 kHz sine wave carrier
signal.
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