| 摘要 |
PROBLEM TO BE SOLVED: To provide a small current meter capable of reducing effectively the noise in a current to be measured. SOLUTION: A bar-shaped member 16 is installed projectingly from the bottom surface 18a of a plate 18 of a Faraday cup 10, and a receiving part 21 is installed on the upper surface 25a of an outer box 25 of a preamplifier device 20. In this case, external threads 16a are carved on the outer surface of an end part of the bar-shaped member 16, projecting downward from a fixed ring 17, and internal threads 21a are carved on the inner surface of the receiving part 21, and the bar-shaped member 16 is connected to the receiving part 21 by thread connection. A shield ring 22, encircling the connection part between the bar-shaped member 16 and the receiving part 21, is interposed between the bottom surface 18a of the plate 18 and the upper surface 25a of the outer box 25, to thereby shield an electromagnetic wave entering the connection part between the bar-shaped member 16 and the receiving part 21.
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