| 摘要 |
PROBLEM TO BE SOLVED: To remarkably reduce an adverse influence of a noise when inspected by interposing an insulator between cylinders made of conductors connected to a ground to engage the cylinders with an outside of a guide tube and projecting ends of a needle-like contactor from ends of the cylinders. SOLUTION: Since a circuit board 1 is forwarded toward a printed board A of a material to be inspected and a needle-like first contactor 5 of each probe 3 is brought into contact with a terminal electrode A1 of the board A and then pressed by an elastic force of a first spring 9, the board 1 is electrically connected to the contactor 5. Then, the contactor 5 and a guide tube 4 for holding the contactor 5 are covered with a cylinder 1 connected to a ground, and the cylinder 1 seals peripheries of the tube 4 and the contactor 5 to effectively avoid an invasion of a noise near the tube 4 and the contactor 5. The cylinder 1 can be constituted to be urged by the spring 9 provided in the guide tube in the same direction as the projecting direction of the contactor 5.
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