AM frequency
The frequency of the modulating waveform.
Modulation Depth
The amplitude range of modulating waveform. In 0% modulation, the output
amplitude is half of the specified value. In 100% modulation, the output
amplitude is equal to the specified value. For an external source, the depth of
AM is controlled by the voltage level of the signal connected to the
Mod/FSK/Trig connector at the rear panel. +1 V corresponds to the currently
set depth 100%.
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.
Mod
Type
Load
Parameter 1
Parameter 2
Parameter 3
Modulating wave
Carrier wave
Figure 5-14: FM user interface
How to set the parameters of FM
(1) Press the Mode function key, then press the FM softkey to enter the 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
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