Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
November 3, 2009
Patent Application Number
11689224
Date Filed
March 21, 2007
Patent Primary Examiner
Patent abstract
This invention relates to fault detection in electrical circuits. The invention provides a method and apparatus for testing an input circuit by generating a periodic test signal having a predetermined phase and a predetermined amplitude; summing the test signal and an input signal to provide a summed signal; processing the summed signal to provide an output signal; generating an extracted test signal from the output signal; comparing the extracted test signal with a reference signal representing said periodic test signal; generating an error signal in dependence upon the result of said comparing step. The invention also provides a method and apparatus for testing a plurality of adjacent input circuits.
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