Table of Contents
Advertisement
(6) Press F3 to set Mod Frequency. The range is 1μHz～20KHz (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 1kHz.
For an External Source, the Deviation is controlled by the voltage Level of the signal
connected to the Modulation In connector in the rear panel. +5V corresponds to the
selected Deviation and -5V 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.
Load
Phase Deviation
Mod Type
Mod Shape
Source
Carrier Waveform
How to set the parameters of PM
(1) Press Mod function button to enter the Modulation mode.
(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 P10. Press
PM Frequency
Current Parameter
Carrier
Amplitude
Figure 5-16: The User Interface of PM
button again to return to the Modulation mode interface.
Carrier
Frequency
22
Modulating Waveform
Carrier Waveform
Advertisement
Table of Contents
