| 摘要 |
PROBLEM TO BE SOLVED: To detect a breakage of wires even during a measurement without having to interrupt the measurement in a four-terminal resistance measuring apparatus. SOLUTION: A first AC current I<SB>ac1</SB>for detecting the breakage of wires is passed through a Hi-side current path including both a Hi-side current supply terminal 101 and a Hi-side voltage detection terminal 201 from a first AC current source 230, and a generated voltage is monitored by a second comparator 233. A second AC current I<SB>ac2</SB>for detecting the breakage of wires is passed through a Lo-side current path including both a Lo-side current supply terminal 102 and a Lo-side voltage detection terminal 202 from a second AC current source 240, and a generated voltage is monitored by a third comparator 242. COPYRIGHT: (C)2005,JPO&NCIPI
|
