| 摘要 |
<p>PURPOSE:To obtain the measuring value always high in the reliability, by checking the electric-photo conversion section of the current detector with the DC power supply of a constant current every lightning. CONSTITUTION:The coil 1 detects the lightning current when lightning is present. The output of the coil 1 is fed to the electric photo conversion section 7 or 9 via the overvoltage protection gap 2, resistor 4, Zener diode and resistor 5. The illumination of the electric photo conversion section 7 or 9 is fed to the observing unit C via the optical fiber 15 or 16. The minicomputer 26 calculates the level of input signal and displays it. Simultaneously, a constant DC current is fed to the electric photo conversion sections 7 and 9 through the operation of the contol circuit 24, the illumination at that time is observed with the observing unit C and compared and calibrated at the minicomputer 26.</p> |
