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Chapter 18 Function/ Arbitrary Waveform Generator (Option) RIGOL
MSO8000 User's Guide 18-15
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).
FM
FM (Frequency Modulation), namely the frequency of the carrier waveform changes
with that of the modulating waveform, as shown in the f igure below.
Figure 18-11 Frequency 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 Frequency Offset
Press Deviation, then rotate the multifunction knob or use the pop-up
numeric keypad to set the frequency deviation of modulating waveform from the
carrier frequency. The available range of the frequency deviation is from 1 Hz to
the frequency of the current carrier waveform, and the sum of the frequency
deviation and carrier frequency cannot be greater than the maximum frequency
Modulating
Signal
Carrier Signal
Modulating
Waveform
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