B&K Precision 2516 - Manual - Manual (Page 38)

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4.
Connect the probe tip to the 3V port (1 kHz, 3Vpp Square Wave) and
the reference ground clip to the ground port on the probe
compensation connector.
5.
Display the channel and press
.
6.
Check the shape of the waveform displaying on the screen.
Under Compensated Correctly Compensated Over Compensated
7.
Adjust the trim on the probe or repeat all the operations above if
necessary.