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PML SERIES
Adjustment Procedures
The probe can be adjusted for low frequency (LF) compensation and for high frequency (HF) com-
pensation.
A factory calibration is possible at any time on request.
The trimmers are sensitive components. Too much mechanical pressure during ad-
justment might damage the trimmers.
● LF Compensation
When the probe is connected to the oscilloscope input the first time probes cable capacitance
needs to be matched to the oscilloscope input capacitance. This matching assures good amplitu-
de accuracy from DC to the probes bandwidth.
A poorly compensated probe clearly influences the overall system performance (probe + scope)
EN
and causes measurement errors resulting in inaccurate readings and distorted waveforms.
LF compensation is performed by connecting the probe to the CAL – output on the oscilloscope
front panel and adjusting the LF compensation trimmer to optimum square wave response. For
clarification see below figures.
undercompensated
28
optimum
LF Compensation
overcompensated
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