Iwatsu HV-P60A Instruction Manual page 16

High Voltage Probe HV-P60A
(4) Adjust the input range of the oscilloscope, and display the
waveform on the screen of the oscilloscope.
(5) The driver for the adjustment is inserted in the adjustment hole
of the Matching box (Refer to Figure 3(b)). The waveform of the
probe is adjusted to become the ideal waveform like "Figure 3(e)
Adequated" while seeing the waveform (following Figure 3(c)
and Figure 3(d)) displayed in the oscilloscope.
Figure 3(c) Overcompensated Figure 3(d) Undercompensated
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Figure 3(e) Adequated