Figure 21.11 Fm - Rigol MSO8000A Series User Manual

1. Select the Modulating Waveform
Press Waveform, and rotate the multifunction knob
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 waveform, and noise.
2. Set the Modulation Frequency
Press Frequency, then rotate the multifunction knob
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
pop-up numeric keypad to set the modulation 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 (on the 50 Ω load).
21.3.2 FM
FM (Frequency Modulation), namely the frequency of the carrier waveform changes
with that of the modulating waveform, as shown in the figure below.
Copyright ©RIGOL TECHNOLOGIES CO., LTD. All rights reserved.
Function/Arbitrary Waveform Generator (Option)
Modulating Signal
Carrier Signal
Modulated Waveform

Figure 21.11 FM

to select the desired
or use the pop-up
or use the
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