| 摘要 |
PURPOSE:To enable very accurate measurement of a minute current such as a detector current by providing an operational amplifier for converting a current signal of a neutron detector into a voltage signal, which is provided in an input stage of an insulation amplifier. CONSTITUTION:In regard to a digital signal which is an output of an A/D converter 15, conversion is made into a current value obtained by multiplication using as an operational coefficient a value which is obtained by dividing each detector current at the time when the output of the A/D converter 15 takes the maximum value, by the maximum value of the output of the A/D converter 15. When the output of the A/D converter is converted into the current value in an arithmetic circuit 16, the detector current at the time when the output of the A/D converter 15 takes the maximum value is 200 muA, and thereby the detector current is calculated as 15X(200muA/4095)=0.73 muA. An error contained in the result of this calculation is 0.03% or below in regard to a detection current signal 75muA at the time when an output of a nuclear reactor is 100%.
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