| 摘要 |
PROBLEM TO BE SOLVED: To provide a method detecting disconnection of a wire or a cable even when high-frequency pulse propagation characteristic of a cable is changed due to change in installing environment or the like of the wire, and also to provide its device. SOLUTION: This device comprises: a disconnection characteristic amount extracting means 6 extracting a plurality of disconnection characteristic amounts from a wave form of response signals; a disconnection index calculating means 7 calculating a disconnection index, previously defined as a function setting up the plurality of disconnection characteristic amounts as variables, using a plurality of disconnection characteristic amounts; and a disconnection estimating means 8 estimating disconnection rate from the disconnection index values. COPYRIGHT: (C)2009,JPO&INPIT
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