B&K Precision 2516 - Manual - Manual (Page 31)

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The oscilloscope will display a boot screen shown below for 5-10 seconds
before the main operating display appears.
Figure 10 - Boot Screen
To power OFF the device, hold down for at least 3 seconds.
2.4 Perform Self-Calibration
We recommend you to perform self-calibration if any of the following
applies:
-
Operating temperature changes by more than 5 °C after
30 minutes of use.
-
Abnormal behaviors and operations are present.
-
Measurements are out of accuracy.
CAUTION:
Before performing self-calibration, disconnect all
inputs of the instrument. Otherwise, the instrument
may not calibrate correctly or may cause errors.