| 摘要 |
PURPOSE:To perform a test without compelling a worker to watch display carefully, by providing a voltage peak hold circuit for holding peak voltage and a display means for displaying peak voltage and detecting dielectric breakdown voltage from the indication value of said display means. CONSTITUTION:A peak hold circuit holds the peak value in the pulsating current outputted from a rectifier circuit 11 to output the same to a panel meter 14 through a display adjusting amplifier 13. When the voltage value of an induction coil flowed to a secondary coil 5 becomes high and dielectric breakdown is generated in an insulated cable and an excessive current is flowed to the secondary coil 5, AC of a primary coil 4 is blocked by an overcurrent detector 6 and a breaker 7 and AC of the secondary coil 5 is extincted. At this time, a peak hold circuit 12 has held the AC voltage value immediately before distinction and said voltage value is displayed on the panel meter 14 as it is. Because the detection of breakdown voltage is not performed by a voltmeter but by the panel meter 14 in this method, it is unnecessary that a worker watches display carefully.
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