User`s guide

Chapter 2 Front Panel Operations RIGOL
DSG3000 User’s Guide 2-19
Modulation
Amplitude Modulation (AM)
During amplitude modulation (AM), the modulating signal changes the amplitude of
the RF carrier waveform linearly.
To Enable AM
Press AM  Switch to select “On” or “Off”.
 On: enable the AM function. The backlight of AM goes on and the AM label is
displayed in the function status area in the user interface.
 Off: disable the AM function and this is the default state.
To Select the Modulation Source
Press AM  Source to select “Int”, “Ext” or “Int & Ext” modulation source.
1. Internal Source
After selecting “Int”, 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
After selecting “Ext”, Freq and Waveform are grayed out and disabled. The RF
signal generator receives the external modulating signal input from the [EXT
MOD INPUT] connector (as shown in the figure below) at the front panel. This
modulating signal can be any waveform.
NOTE: The input amplitude of external modulating signal reaches +/-3V.
3. Internal & External
After selecting “Int & Ext”, both internal and external modulating sources are
selected at the same time and you can perform dual-tone AM signal modulation.