B&K Precision 2552-2559 - Manual - Manual (Page 112)

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Figure 67 - Language Selection Screen
Self Calibration
Self Calibration procedure can optimize the signal path for optimal
measurement results. You can run this procedure at any time. If the
operating temperature changes by more than 5° C or the instrument runs
more than thirty minutes, running self calibration is recommended.
When you run the self Calibration, you must disconnect all the probes
and leads, and make sure the scope is not in Single-Shot mode. Then
press the “Utility” button to choose the “Do self cal” to show the self
Calibration Menu, and execute self calibration program according to
the prompt on the screen.