| 摘要 |
<p>An instrument for measuring alternating current comprises a transformer (1) for producing secondary current on its secondary side from primary current on its primary side, a rectifier circuit (4) for rectifying the secondary current derived from the transformer (1), a capacitor (6) for receiving the rectified current from the rectifier (4), a Zener diode (7) for controlling to charge the capacitor (6) with the secondary current to a predetermined voltage and discharge it at the predetermined voltage, a load resistor (12) provided in a circuit where the secondary current flows, a voltage-to-frequency converter (10) supplied with the secondary current from the capacitor (6) for converting the voltage across the load resistor (12) to a frequency, and an optical fiber (13) and an electric-to-light converter (11) supplied with the discharge current from the capacitor (6) for transmitting signals output from the voltage-to-frequency converter (10) through the fiber.</p> |
