Rigol DS1302CA User Manual page 41

6. To invert a waveform
Invert turns the displayed waveform 180 degrees, as respect to the ground
level. When the oscilloscope is triggered on the inverted signal, the trigger is
also inverted. Figure 2-13 and 2-14 show the changes before after the inversion
respectively.
User‟s Guide for DS1000CA Series
Figure 2-13
The waveform before inversion
Figure 2-14
The waveform after inversion
RIGOL
Invert Off
Invert On
2-13