Rigol DS6000 Series User Manual page 154

RIGOL
adjust the positions of cursor A and B at the same time. During the
adjustment, the measurement results will change accordingly. The
adjustable range is limited within the screen.
5. Measurement Example
Use manual cursor measurement to measure the period (△X) of a square
waveform and the result is 1 ms equaling the result from auto measurement.
Cursor
Measurement
Auto
Measurement
6-30
6 To Make Measurements
DS6000 User's Guide