Teledyne LeCroy PP018 - Manual (Page 9)

Instruction Manual
920876-00 Rev A 7
High Frequency (HF)
High frequency should rarely require adjustment. However, if
adjustment is required:
1. Apply a 1 MHz square wave to the probe (< 0.7 ns rise-time).
2. Adjust the right trimmer (HF) located on the PP017probe body:
or both trimmers on the PP018 BNC Box (HF2 or HF1):
until you achieve a flat-topped square wave per the center
illustration in the figure below.