3-12
IM 701310-01E
Explanation
Necessity of Phase Correction of the Probe
The probe comes with its phase corrected approximately to match the input capacitance
of the relevant oscilloscope. However, there is variance in the input resistance and input
capacitance of each input channel of individual oscilloscopes. This results in a mismatch
in the voltage divider ratio between low and high frequency signals and causes uneven
frequency characterstics.
There is a variable capacitor for adjusting the division ratio (trimmer) for high frequency
signals on the probe. The phase is corrected by adjusting this trimmer so that even
frequency characteristics are obtained.
When using the probe for the first time, make sure to perform phase correction.
Because the input capacitance varies on each channel, probe compensation is required
when the probe is switched from one channel to another.
Phase Compensation Signal
The following square wave signal is output from the signal output terminal for probe
compensation adjustment.
Frequency:
Approx. 1 kHz
Amplitude:
Approx. 1 V
Differences in the Waveform due to the Phase Correction of the Probe
Correct waveform
Over compensated (The gain
in the high-frequency region
is too high.)
Under compensated
(The gain in the high-
frequency region is too low.)
3.5 Compensating the Probe (Phase Correction)
