User manual

Chapter 5 Modulated Waveform Output RIGOL
DG4000 User's Guide
5-19
To Select the 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 frequency at which the output phase shifts
between "carrier phase" and "modulating phase" is determined by "PSK Rate".
2. External Source
When external source is selected, the generator receives the external
modulating signal from the [Mod/FSK/Trig] connector (as shown in the
figure below) at the rear panel.
Note: The [Mod/FSK/Trig] connector is different when controlling PSK
and AM/FM/PM modulations externally. In PSK modulation, the
[Mod/FSK/Trig] connector has adjustable edge polarity.
To Set the PSK Rate
When internal source is selected, press PSK Rate to set the frequency at which
the output phase shifts between "carrier phase" and "modulating phase".
 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" is selected, this menu is grayed out and disabled.
[Mod/FSK/Trig]