FM (Frequency Modulation)
The modulated waveform consists of the carrier wave and the modulating
wave. For FM, the frequency of the carrier wave varies with the instantaneous
voltage of the modulating wave. The FM user interface is shown below.
Figure 5-16: FM user interface
How to set the parameters of FM
(1) Press the Mode function key, then press the FM softkey to enter FM user
interface.
(2) Select carrier wave shape:
The carrier wave can be Sine, Square, Ramp, or Arbitrary wave (except
DC). Press , , , or to select a desired carrier wave
shap.
(3) Set carrier wave parameters:
Press the wave shap key of the selected carrier wave to display the
waveform and parameters of the carrier wave. You can change the
parameters of the carrier wave. Press Mode to return to the modulation
mode interface.
(4) Select modulating wave source:
Press the Source softkey to select the modulating wave source.
If you select External, use the Sync/Ext Mod/Trig/FSK connector at the
rear panel to input the external modulating signal, then skip ahead to step
(7).
If you select Internal, continue with the following steps.
(5) Select modulating wave shape:
Press the Shape softkey, then press the Sine, Square, Ramp, Noise, or
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