| 摘要 |
PROBLEM TO BE SOLVED: To provide a discharge frequency meter capable of easily changing operation sensitivity of the discharge frequency meter, protecting an ammeter with sure, and stabilizing display of the ammeter even in the case where the current that flows at always contains a high frequency component. SOLUTION: In the discharge frequency meter, one end of a first zinc oxide element r1 is connected to an arrester AR. An input end of a rectifier ReC is connected to one end and the other end of the first zinc oxide element. A first capacitor C1 is charged with an output voltage of the rectifier. A count up coil T is driven by the electric charge of discharge of the first capacitor. A protection circuit is connected to the other end of the first zinc oxide element. The ammeter Am is connected to the protection circuit. A variable resistor R1 is connected parallel to the first zinc oxide element. COPYRIGHT: (C)2012,JPO&INPIT |
