RIGOL Chapter 2 Front Panel Operations
2-14 DSG800 User's Guide
Modulation
Amplitude Modulation (AM)
During amplitude modulation (AM), the modulating signal changes the amplitude of
the RF carrier waveform linearly.
Press MOD AM to enter the amplitude modulation parameter setting menu.
To Turn on Amplitude Modulation
Press Switch to select "On" or "Off".
On: turn on the AM function. The AM label in the function status area in the user
interface is illuminated.
Off: turn off the AM function and this is the default state.
Note: If a sweep manner is selected and the step sweep time is lower than 30 ms,
"You can turn on the AM when sweep time is greater than 30ms" will be displayed in
the user interface when amplitude modulation is turned on.
To Select the Modulation Source
Press Source to select "Int" or "Ext" modulation source.
1. Internal Source
When "Int" is selected, the internal modulation source is turned on. At this point,
the instrument provides the modulating signal and you can set the modulation
frequency and modulation waveform of the modulating signal.
2. External Source
When "Ext" is selected, Freq and Waveform are grayed out and disabled. The
RF signal generator receives the external modulating signal input from the [EXT
MOD IN] connector (as shown in the figure below) at the rear panel. This
modulating signal can be any waveform.
Note: The input amplitude of the external modulating signal cannot exceed
+/-3 V (HighZ). To ensure the modulation performance, the input amplitude of
the external modulating signal should be less than 1 Vpp.
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