Chapter 2 Front Panel Operations RIGOL
DG800 User's Guide 2-51
To Select Modulation Source
Tap the Source parameter selection field to select an "Internal" or "External"
modulation source.
1. Internal Source
When the internal source is selected, the modulating waveform is set as a Square
with 50% duty cycle. At this time, the rate at which the output phase "shifts"
between "carrier phase" and "modulating phase" is determined by the
modulation rate.
2. External Source
When the external source is selected, the generator receives the external
modulating signal from the rear-panel [CH1/Sync/Ext Mod/Trig/FSK]
connector.
Note: The [CH1/Sync/Ext Mod/Trig/FSK] connector controlling PSK
modulation externally is different from controlling AM/FM/PM modulations
externally. While controlling the PSK modulation, you can set the polarity.
To Set Modulating Rate
When the internal source is selected, tap the Mod.Rate parameter input field and
use the numeric keypad to set the rate at which the output phase shifts between
"carrier phase" and "modulating phase".
You can also use the arrow keys and the knob to input a desired frequency
value.
The frequency range is from 2 mHz to 1 MHz, and the default is 100 Hz.
Note: When the external modulation source is selected, this menu will be grayed out
and disabled.
To Set Modulating Phase
Modulating phase indicates the phase of the modulating waveform. Tap the Phase
parameter input field and use the numeric keypad to set the modulation phase.
You can also use the arrow keys and the knob to input a desired phase value.
The phase range is from 0° to 360°, and the default is 180°.
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