Patent ID: 8339141
Filing Date: 2012-12-25
Classification: G01R

Abstract:
1. An apparatus for locating an electrical fault in an electrical test object, comprising: an electrical pulse signal source; a testing lead adapted to be connected at a connection interface to an input of the test object; a bi-directional coupler having a forward signal input, a forward signal output, a first coupling output and a second coupling output; a separation filter having a first terminal and a second terminal; a measured signal detection circuit having a first channel input, and having a second channel input connected to said second coupling output of said bi-directional coupler, and having an output; a switching arrangement connected and switchable so as to selectively connect said pulse signal source in series through said forward signal input and said forward signal output of said bi-directional coupler and said first and second terminals of said separation filter to said testing lead, and so as to selectively connect said first channel input of said measured signal detection circuit to said first coupling output of said bi-directional coupler; a processor unit having a processor input connected to said output of said measured signal detection circuit, and having a processor output, wherein said processor unit is programmed and adapted to carry out a numerical implementation of a Fourier transformation to transform a time domain signal in the time domain as received at said processor input to a frequency domain signal in the frequency domain, and to compensate the frequency domain signal in the frequency domain so as to remove therefrom interference pulses originating from said testing lead, said connection interface and/or said separation filter so as to produce a compensated frequency domain signal, and to transform the compensated frequency domain signal from the frequency domain to the time domain so as to produce a compensated time domain signal at said processor output; and a measured signal evaluation unit having an input connected to said output of said processor unit.