User Manual

8
Adjustment Procedures PMT221A
LF Compensation
LF needs to be adjusted when the probe is connected to the scope input the first time. LF compensation matches
the probes cable capacitance to the oscilloscope input capacitance.
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.
HF Compensation
HF needs to be adjusted when the probe is connected to the scope input
the first time. HF adjustment is performed by connecting the probe to a
rectangular wave generator with a fast rise time. Adjust the trimmer for
optimum square wave response.
LF Compensation
HF Compensation
OPTIMUM
OVER COMPENSATEDUNDER COMPENSATED
OPTIMUM