Owon SDS series User Manual page 62

The description of Adjust Menu is shown as the follows:
Function Menu
Self Cal
Default
Do Self Cal (Self-Calibration)
The self-calibration procedure can improve the accuracy of the oscilloscope under
the ambient temperature to the greatest extent. If the change of the ambient
temperature is up to or exceeds 5℃, the self-calibration procedure should be
executed to obtain the highest level of accuracy.
Before executing the self-calibration procedure, disconnect the probe or wire and
the input connector. Press the Utility button. Then, press the H1 button and the
function menu will display at the left of the screen, turn the M knob to choose
"Adjust", and then press the H2 button to choose "Self Cal", entering the
self-calibration procedure of the instrument.
● Pass/Fail
The Pass/Fail function monitors changes of signals and output pass or fail signals by
comparing the input signal that is within the pre-defined mask.
Press the Utility button and turn the M knob to select the Pass/fail to go to the
following menu.
5.Advanced User Guidebook
Setting Description
Carry out the self-calibration procedure.
Call out the factory settings.
Figure 5-45 Self-Calibration
Figure 5-46 Pass/Fail menu
57