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(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 PM Frequency. The range is 1μHz～20KHz (Internal source only).
(7) Press F4 to set Phase Deviation. The Phase Deviation between the Modulating
Waveform and the Carrier Waveform ranging from 0° to 180°.
FSK (Frequency Shift Keying)
The FSK Modulation is a modulation method, the output frequency of which switches
between two the pre-set frequencies (Carrier Waveform Frequency and the Hop
Frequency). The Frequency of the Output Frequency switch between the carrier waveform
frequency and the Hop frequency is called the FSK rate. The frequency by which the
output frequency switch from each other is determined by the Internal Frequency
generator or the Signal Voltage Level offered by the Ext Trig/FSK/Burst connector in
the rear panel. The Carrier Waveform can only be Sine. The user interface of the FSK is
shown as below.
Load
Mod Type
Source
Carrier Waveform
How to set the parameters of FSK
(1) Press Mod function button to enter the Modulation mode.
(2) Press F1 to switch Mod Type to FSK. 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
Current Parameter
Carrier
Amplitude
Figure 5-17: The User Interface of FSK
button again to return to the Modulation mode interface.
FSK Rate
Carrier
Frequency
23
Modulating Waveform
Carrier Waveform
Hop Frequency
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