OWON AG (-F) Series - Manual (Page 32)

5.Front Panel Operation
27
(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.
Note:
The Sum of the Deviation and the Carrier Frequency should be equal to or less than
maximum frequency of the selected function plus 1 kHz.
For an External Source, the Deviation is controlled by the voltage Level of the signal
connected to the Ext Mod In connector in the rear panel. +5 V corresponds to the selected
Deviation and -5 V to the negative selected Deviation.
PM (Phase Modulation)
The modulated waveform consists of two parts: the Carrier Waveform and the
Modulating Waveform. The Carrier Waveform can only be Sine. In PM, the phase of the
Carrier Waveform varies with the instantaneous voltage level of the modulating
waveform. The user interface of the PM is shown as below.
Current Parameter
Carrier
Frequency
Carrier
Amplitude
Carrier Waveform
Modulating Waveform
Load
Phase Deviation
PM Frequency
Mod Type
Mod Shape
Source
Figure 5-19: The User Interface of PM
How to set the parameters of PM
(1)
Press Mod function button, then press F1 to select Mod.
(2)
Press F1 to switch Mod Type to PM. 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 12. Press
button again to return to the Modulation mode interface.