摘要 |
PURPOSE:To obtain an inexpensive measuring apparatus by providing a switching signal generation circuit for changing over a switching contact of a switch gear near the switch gear 1. CONSTITUTION:A switching signal generation circuit 4 transmits a signal to switch and connect the switching contact 101 of a switch gear 1 sequentially to first-fourth terminals 1a-1d for respectively specified times. In a voltage measuring circuit 3, first-third input signals are set to correct or calibrate the negative polarity value, 0V level and the positive polarity value of the voltage measuring circuit 3 and the correction and the calibration thereof are done based on the respective input signals. Fourth input signal is set to be a voltage E to be measured and the voltage being measured is determined by measuring the value thereof.
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