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RIGOL Chapter 17 Function/Arbitrary Waveform Generator (MSO7000 Option)
17-14 MSO7000/DS7000 User Guide
AM
AM (Amplitude Modulation), namely the amplitude of the carrier waveform changes
with the amplitude of the modulating waveform, as shown in the figure below.
Figure 17-10 Amplitude Modulation
1. Select the Modulating Waveform
Press Waveform, and rotate the multifunction knob to select the desired
modulating waveform, and then press down the knob to select it. You can also
press Waveform continuously or enable the touch screen to select it. The
available modulating waveforms include Sine, Square, Triangle, and Noise.
2. Set the Modulation Frequency
Press Frequency, then rotate the multifunction knob or use the pop-up
numeric keypad to set the frequency of the modulation signal. The available
range is from 1 Hz to 50 kHz.
3. Set the Modulation Depth
The modulation depth refers to the strength of the AM and is expressed in
percentage. Press AM Depth, then rotate the multifunction knob or use the
pop-up numeric keypad to set the AM depth of the modulating waveform. The
available range is from 0% to 120%. When it is set to 0%, the output amplitude
is half of the carrier amplitude. When it is set to 100%, the output amplitude
equals the carrier amplitude. When it is set to a value greater than 100%,
envelop distortion will occur, which must be avoided in actual circuit; at this
point, the output of the instrument will not exceed 2.5 Vpp (the load is 50 Ω).
Modulating
Signal
Carrier Signal
Modulated
Waveform
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