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5.9.3. FM
The modulated waveform consists of two parts: the carrier and the modulating waveform. In FM, the frequency of the carrier varies
with the instantaneous voltage of the modulating waveform.
Press
[Mod] → [Type] → [FM]
, the parameters of FM modulation are shown in Figure 42.
Figure 42: Setting Interface of FM Modulation
Function Menu
Settings
Explanations
Type
FM
Frequency modulation
Source
Internal
The source is internal
External
The source is external. Use the [Aux In/Out] connector at the rear panel.
Freq Dev
Set the frequency deviation
Shape
Sine
Choose the modulating waveform.
Square
Triangle
UpRamp
DnRamp
Noise
Arb
FM Freq
Set the modulating waveform frequency. Frequency range: 1 mHz ~ 20 kHz
(internal source).
To Set Frequency Deviation
Press
FM Dev
to highlight the parameter, and then use the numeric keyboard or arrow keys and knob to input the desired value.
The deviation should be equal to or less than the carrier frequency.
The sum of the deviation and the carrier frequency should be equal to or less than maximum frequency of the selected
carrier waveform.
Note:
The methods of setting other parameters of FM are similar to AM.