Datasheet

5.27. 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.
Figure 0-17: The User Interface of FM
5.28. How to set the parameters of FM
1. Press Mod function button, then press F1 to select Mod.
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 page 67. Press button again to return to the Modulation mode
interface.
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.
6. Press F3 to set Mod Frequency. The range is 2 mHz～20 kHz (Internal source
only).
7. Press F4 to set FM Deviation. The Deviation should be less than the Carrier
Waveform Frequency.
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