| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a fixed type in-core measuring device with high reliability by improving the measurement accuracy for microvoltage signal with a circuit constitution of an input signal amplifier, shortening measuring time and improving in noise resistance and grasping exact measured value, etc. SOLUTION: This fixed type in-core measuring device is provided with a plurality of gamma temperature meters 1 in the core of a reactor. An input signal amplifier 5 for amplifying the gamma temperature detection signal 2 from the gamma temperature meter 1 is constituted of a multiplexer 10 as a turn switching means of the plurality of detection signals, an input amplifier part 13 and a differential amplifier part 14 and an isolation 15.</p> |
