Rigol DG800 Series, User Manual

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RIGOL Chapter 2 Front Panel Operations
2-46 DG800 User's Guide
To Set the Modulation Polarity
Tap the Polarity parameter selection field to select "Positive" or "Negative" polarity
of the modulating waveform to control the output amplitude.
In the internal modulation, set the polarity to "Positive", and the generator will
output an amplitude whichever is smaller between the carrier amplitude and
modulating amplitude when the modulating waveform is a logic low level. It will
output an amplitude whichever is greater between the carrier amplitude and
modulating amplitude when the modulating waveform is a logic high level. The
situation is the opposite when the polarity is set to "Negative".
In the external modulation, set the polarity to "Positive", and the generator will
output an amplitude whichever is smaller between the carrier amplitude and
modulating amplitude when the external input signal is a logic low level. It will output
an amplitude whichever is greater between the carrier amplitude and the modulating
amplitude when the external input signal is a logic high level. The situation is the
opposite when the polarity is set to "Negative".