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5.30. 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 66. Press
button again to return to the Modulation mode interface.
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 2 mHz
～
20 kHz (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°.
5.31. 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.
Current Parameter
Carrier Frequency
Carrier Amplitude
Carrier Waveform
Modulating Waveform
Load
FSK Rate
Mod Type
Source
Hop Frequency
Figure 0-19: The User Interface of FSK
