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Looking at the effects of frequency on probe impedance, when a typical 10 MΩ probe is used at low frequency the input resistance is dominant, but as the frequency increases the input capacitance becomes dominant. Typically, a passive probe is going to measure somewhere between 9 pF and 12 pF of capacitance. A possible result is that the capacitive loading effect changes the form of the signal of interest, so the user is not getting a true representation of the waveform.
PTM Published on: 2012-06-11
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