| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem that a resistance measuring device which satisfies the requirement of a safety standard and which can obtain a measurement of good operability and high accuracy does not exist in the resistance measuring device which measures a resistance value while a specified AC current is made to flow across a grounding terminal installed at an electronic apparatus or the like and a prescribed part in order to prevent an electric shock accident in the JIS, the UL, the IEC, the CSA and the like required from the electronic apparatus or the like. SOLUTION: Electric power, i.e., a voltage and a current which are supplied to a part to be measured are stabilized by independently installed negative-feedback loops on the basis of a reference signal which is decided by a current setting part. A constant current is supplied to the part, to be measured, so as to be capable of corresponding to a change in a change in a resistance value to be measured. The operability of the resistance measuring device is improved. The voltage to be applied is changed into a constant voltage by its voltage value when it reaches a clamping voltage. The generation of a voltage exceeding the clamping voltage of the safety standard is suppressed so as to ensure the safety of the resistance measuring device. It is possible to provide the resistance measuring device in which a transient surge voltage generated in the short-circuit state or the open state of the part to be measured is eliminated on the basis of the above function and in which a voltage exceeding a regulation is not generated from its viewpoint.
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