Datasheet

83
5.24. To Generate the Modulated Waveform (P 4125 – 4165)
Modulation function is only used for CH1. Press the Mod button, then press F1 to
select Mod to generate modulated waveform. The waveform generator can modulate
waveform using AM, FM, PM, FSK and PWM. To turn off the modulation, press the Mod
button.
5.25. AM (Amplitude Modulation)
The modulated waveform consists of two parts: the Carrier Waveform and the Modulating
Waveform. The Carrier Waveform can only be Sine. In AM, the amplitude of the Carrier
Waveform varies with the instantaneous voltage of the modulating waveform. The user
interface of the AM is shown as below.
Current Parameter
Carrier
Frequency
Carrier
Amplitude
Carrier Waveform
Modulating Waveform
Load
Mod Depth
AM Frequency
Mod Type
Mod Shape
Source
Figure 0-16: The User Interface of AM
5.26. How to set the parameters of AM
1. Press Mod function button, then press F1 to select Mod.
2. Press F1 to switch Mod Type to AM. 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 66. 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, the setting of AM is finished. If
you choose Internal, continue to the steps below.
5. Press F2 to choose Mod Shape, you can choose Sine, Square or Ramp.