| 摘要 |
PURPOSE:To make it possible to set the exposure X-ray dose accurately by constructing a device so as to correct the voltage fluctuation of the commercial electric source by adjusting a continuous variable resistor to perform fine voltage correction corre sponding to the voltage fluctuation of the electric source. CONSTITUTION:When a main switch 4 is closed a DC voltage obtained from a DC electric source circuit 7 corresponding to the source voltage E is applied to the respective input terminals of voltage comparators 16, 17 through a voltage dividing point 12'. As a reference voltage set by a reference voltage output circuit 14 is applied to the reference terminals of the voltage comparators 16, 17, so corresponding to the difference of this reference voltage and the voltage of the voltage dividing point 12' desired signals are inputted to a logic circuit 21 from respective output terminals of the voltage comparators 16, 17. When a radiography is performed, a continuous variable resistor 11 is controlled so as the green photoelectric element 19, indicator of the adequate voltage condition, is luminous, while observing the luminous conditions of photoelectric elements 18, 19, 20 in a voltage indication circuit 15. Thereby another continuous variable resistor interlocked to the continuous variable resistor 11 is also adjusted so as the output of a continuous resistor 6 is set to an adequate voltage.
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