Teledyne LeCroy WaveRunner МXi-A Getting Started Manual - Manual (Page 21)

Getting Started Manual
922138-00 Rev A 13
B
Passive probes must be compensated to flatten overshoot. This is
accomplished by means of a trimmer at the connector end of the probe.
Attach the connector end of supplied passive probe to any channel.
Connect the probe end to the CAL output connector at the front of the
oscilloscope.
Adjust the trim pot at the connector end of the probe until the square wave is
as flat as possible.