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The maximum input signal amplitude for any probe changes with frequency. (…) Since probe input impedance decreases as applied frequency increases, probe current increases with frequency. The maximum input voltage rating is decreased so that the power rating of the probe components is not exceeded. In probes that have a reverse termination resistor in the probe head, this 1/2 watt resistor will determine the derating curve. In probes that have the termination circuitry at the oscilloscope end of the cable, the I²R characteristic of the cable determines the derating curve.