When a ground fault resistance RL agrees with an alarm threshold RLx, each charge voltage becomes wholly the same as a charging time constant, and each influence of a DC bias characteristic appearing in a capacitor C can become the same in all measuring modes. 地絡抵抗RLが警報閾値RLxのとき各充電電圧と充電時定数全て同じになり、キャパシタCに現れるDCバイアス特性の影響を全ての測定モードにおいて同じにできる。 - 特許庁