| 摘要 |
In a natural state of a probe (41), a plunger (61) is distanced from a rod (62) by a spring (63), the rod (62) is held in contact with a contact element (75) by a spring (74), so that the rod (62) is connected to a common conductor of a base plate via a barrel (55). On the other hand, when an end of a wire comes into contact with an end of the plunger (61) to push it toward the rod (62), the rod (62) is distanced from the contact element (75). To be electrically disconnected from the common conductor of the base plate. Thus, all the barrels (55) and contact elements (75) of a plurality of probes (41) can be held at a specified potential only by a wiring for the signal common conductor.
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