Patent ID: 6694268
Filing Date: 2004-02-17
Classification: G01M,G01N

Abstract:
A leakage inspection method having as an object of an inspection an insulating container in which a liquid is sealed and comprising the steps of applying an inspection voltage of AC high voltage across said container; detecting an AC current flowing through said container and said contained liquid and judging from a detection signal of said AC current whether there exists a defect in said container causing a leakage of said liquid or not, said method further comprising the steps of providing an A/D converter for converting an instantaneous value of the detection signal of the AC current into a digital value; arithmetically operating from an output of said A/D converter a total value of digital values corresponding to the absolute values of said instantaneous values of said AC current detected during a specific totaling period having a specific relation to the waveform of said AC current and comparing said total value as a judgment value with a setting value whereby it is judged that said defect exists in said container when said total value exceeds said setting value.