Patent ID: 6867598
Filing Date: 2005-03-15
Classification: G01R

Abstract:
1. A method for measuring fault locations in high frequency cables and lines, including the following steps: (a) performing a first calibration measurement with a SHORT at the end of the measuring cable, storing the measured values in an array as( ), submitting the measured values to an inverse Fourier's transformation and storing in an array zts( ), (b) performing a second calibration measurement with a LOAD at the end of the measuring cable, storing the measured values in an array zl( ), submitting the measured values to an inverse Fourier's transformation and storing in an array ztl( ), (c) emitting a signal with the frequency f0 and a level a0 from a signal source, (d) splitting the signal in a power splitter and routing the signal in equal parts to a test piece DUT and to a sink, (e) measuring the added signal of the source and the returning wave of the DUT ( (f) changing the frequency f0 with a given frequency value dF and repeating the steps a)-d) until the frequency f0 reaches a given cutoff frequency, (g) applying an inverse Fourier's transformation to the measured values ad( ) and storing of the results in an array ztd( ), (h) standardizing the measured values of the test piece ztd( ) on the basis of the measured values zts( ) and ztl( ) of the first and second calibration measurements, and (i) determining the location of transition points while taking the shortening factor into account.