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(5) Press F2 to choose Mod Shape, you can choose Sine, Square ,Ramp, Noise or
Arb .
(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 must be less than or equal to the sum
of upper limit of current carrier frequency and 1kHz.
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. +1 V corresponds to the selected
Deviation and -1 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.
Load
Phase Deviation
Mod Type
Mod Shape
Source
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
5.Front Panel Operation
Current Parameter
PM Frequency
Carrier
Frequency
Amplitude
Figure 5-19: The User Interface of PM
Carrier
27
Modulating Waveform
Carrier Waveform
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