User Guide

RIGOL Chapter 5 Modulated Waveform Output
DG4000 Series User’s Guide
5-12
To Select Modulating Waveform Source
Press Mod  Source to select “Int” or “Ext” modulating waveform source.
1. Internal Source
When internal source is selected, the modulating waveform is set as a Square
with 50% duty cycle, and the rate at which the output amplitude “shifts”
between “carrier amplitude” and “modulating amplitude” is determined by
“ASK Rate”.
2. External Source
When external source is selected, the generator accepts the external
modulating signal from the [Mod/FSK/Trig] connector at the rear panel.
Note: the [Mod/FSK/Trig] connector is different when controlling ASK
and AM/FM/PM modulations externally. In ASK modulation, the
[Mod/FSK/Trig] connector has adjustable edge polarity.
To Set ASK Rate
When internal source is selected, press ASK Rate to set the rate at which the
output amplitude shifts between “carrier amplitude” and “modulating amplitude”.
 Use the numeric keyboard or direction keys and knob to input the desired
frequency value.
 The frequency range is from 2mHz to 1MHz and the default is 100Hz.
Note: when “Ext” modulation source is selected, this menu would be grayed out
and disabled.
[Mod/FSK/Trig]