PROBLEM TO BE SOLVED: To provide a conduction interference source search device for easily and quickly identifying a source at which an interfering wave is generated.;SOLUTION: The conduction interference source search device comprises: a voltage measurement unit for measuring a voltage-time waveform of a signal propagating through a communication line composed of two wires forming a pair; a current measurement unit for measuring a current-time waveform of the signal propagating through the pair of communication lines; a subtraction processing unit 13b for calculating a difference between voltage-time waveforms; an addition processing unit 13a for calculating a sum of voltage-time waveforms; an FFT arithmetic unit 14a for performing fast Fourier transform on the time waveform of each of the subtraction processing unit, the addition processing unit, and the current measurement unit; a signal power spectrum arithmetic unit 15a for calculating a power spectrum of signal components; an interfering wave power spectrum arithmetic unit 15b; a threshold setting unit 16 for setting a discretionary power threshold; a frequency extraction unit 17 for extracting a frequency range exceeding the power threshold; a filtering unit 18 for cutting components other than those in the frequency range obtained by the frequency extraction unit; and an output display unit 19 for displaying the result of filtering.;COPYRIGHT: (C)2015,JPO&INPIT
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