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Term Explanation
AM Frequency:
The frequency of modulating waveform.
Mod Depth:
The Amplitude Range of modulating waveform. In the 0% Modulation, the output
amplitude is the half of the set one. In the 100％ Modulation, the output amplitude is
the same with the set one. For an external source, the depth of AM is controlled by the
voltage level of the signal connected to the Modulation In connector in the rear
panel. +5V corresponds to the currently set depth 100%.
FM (Frequency Modulation)
The modulated waveform consists of two parts: the Carrier Waveform and the Modulating
Waveform. The Carrier Waveform can only be Sine. In FM, the frequency of the Carrier
Waveform varies with the instantaneous voltage of the modulating waveform. The user
interface of the FM is shown as below.
Load
Frequency Deviation
Mod Type
Mod Shape
Source
Carrier Waveform
How to set the parameters of FM
(1) Press Mod function button to enter the Modulation mode.
(2) Press F1 to switch Mod Type to FM. If the Carrier Waveform is not Sine, the
system will switch it to Sine automatically.
(3) Press
button to display the waveform and parameters of the Carrier
Waveform. You can change the parameters, please refer to "To Output Sine Signals"
on P10. Press
(4) Press F5 to select the source. If the source is External, use the Modulation In
connector in the rear panel to input the external signal, then skip ahead to step (6). If
you choose Internal, continue to the steps below.
(5) Press F2 to choose Mod Shape, you can choose Sine, Square or Ramp.
FM Frequency
Current Parameter
Carrier Amplitude
Carrier Frequency
Figure 5-15: The User Interface of FM
button again to return to the Modulation mode interface.
21
Modulating Waveform
Carrier Waveform
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