OWON SDS Series - Manual (Page 70)

5.Advanced User Guidebook
The description of Adjust Menu is shown as the follows:
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.
Figure 5-59 Self-Calibration
Probe checking:
To check whether probe attenuation is good. The results contain 3 circumstances:
Overflow compensation, Good compensation, Inadequate compensation. According to
the checking result, users can adjust probe attenuation to the best. Operation steps are
as follows:
1. Connect the probe to CH1, adjust the probe attenuation to the maximum.
2. Press Utility menu，press H1 and the function menu will display at the left of the
screen，turn the M knob to choose "Adjust", “ProbeCh.”shows at the bottom
menu；
3. Press H4 ，choose “ProbeCh.”，tips about probe checking shows on the screen；
Function Menu Setting Description
Self Cal Carry out the self-calibration procedure.
Default Call out the factory settings.
ProbeCh. Check whether probe attenuation is good
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