Pwm (Pulse Width Modulation) - Owon AG4101 User Manual

Term Explanation
FSK Rate:
The frequency at which the output frequency shifts between the carrier frequency
and the Hop frequency (Internal Modulation only).

PWM (Pulse Width Modulation)

The modulated waveform consists of two parts: the Carrier Waveform and the
Modulating Waveform. PWM can only be used for pulse modulation, so the Carrier
Waveform must be Pulse. In PWM, the width of the Carrier Waveform (Pulse) varies with
the instantaneous voltage of the modulating waveform. The user interface of the PWM is
shown as below.
Load
Width
Mod Type
Mod Shape
Source
Carrier Waveform
How to set the parameters of PWM
(1) Press Mod function button to enter the Modulation mode.
(2) Press F1 to switch Mod Type to PWM. If the Carrier Waveform is not Pulse, the
system will switch it to Pulse automatically.
(3) Press button to display the waveform and parameters of the Carrier
Waveform. You can change the parameters, please refer to "To Output Pulse Signals"
on P15. 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.
(6) Press F3 to set Mod Frequency. The range is 2 mHz～20 KHz (Internal source
only).
5.Front Panel Operation
Modulating
Current Parameter
Frequency
Carrier
Frequency
Amplitude
Figure 5-16: The User Interface of PWM
button again to return to the Modulation mode interface.
Carrier
25
Modulating Waveform
Carrier Waveform