Promax OD-610 User Manual page 67

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 C, 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.
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Figure 59. Self-Calibration.
Figure 60. Pass/Fail menu.
June 2017