RIGOL DS6000 Series - Manual (Page 245)

13 System Function Setting RIGOL
DS6000 User’s Guide 13-13
Self-calibration
Self-calibration program can quickly help the oscilloscope to reach the best working
state and get the most precise measurement values. You can perform self-calibration
at any time especially when the change range of the environment temperature is up
to or more than 5 ℃. Make sure that the oscilloscope has been warmed up or
operated for more than 30 minutes.
The self-calibration uses the fast edge signal output from the [Trig
Out/Calibration] connector at the rear panel as the calibration signal. Please
connect this signal to the four input channels and the external trigger input channel,
and then press UTIL  Self-Cal and the self-calibration interface as shown in the
figure below will be displayed on the screen.
Press Start and the oscilloscope will start to execute the self-calibration program.
Press Exit to give up the self-calibration operation at any time and return to the
previous menu.
Note: most of the keys are disabled during the self-calibration.