| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that, in a four terminal measuring device implementing connection check by loading check current to wiring connecting between a measuring device and a test object, since it is required to cutoff a current source so that the measured current does not flow during the connection checking period or to reduce measured current value, constituent becomes complicated. SOLUTION: A switching means is provided for making or breaking a check current so as to check the connected condition based on voltage difference when check current is applied and not. Therefore, connection check is implemented possibly while applying the measured current and also magnitude of contact resistance can be evaluated. COPYRIGHT: (C)2007,JPO&INPIT
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