Rigol DS2000E Series User Manual page 155

Chapter 6 MATH and Measurements
Press Vtop to select "Histogram" or "Vmax".
― Histogram: takes the voltage between the flat top of the waveform and
the GND as the top value.
― Vmax: takes the maximum value of the waveform data as the top
value.
Press Vbase to select "Histogram" or "Vmin".
― Histogram: takes the voltage between the flat base of the waveform
and the GND as the base value.
― Vmin: takes the minimum value of the waveform data as the base
value.
DS2000E User's Guide
RIGOL
6-25