PURPOSE: To reduce impedance of a ground and prevent noise between respective wiring of a circuit by forming a ground pattern part on an entire face and forming a circuit so that a contact is switched from the ground only at terminal plugs of wiring, etc.
CONSTITUTION: A plug-in type circuit test board comprises a wiring/part terminal plug hole 1, a connection pattern part P, ground releasing/connecting metals 2, a ground pattern part 3, a ground conductor insulating part 4, an insulating part 5 and a chassis part 6 which are sequentially stacked from upward. When a lead 7 of a wire or a part terminal is inserted into the plug hole 1, the connection metal 2 which has been connected to the lower pattern part 3 jumps up and is switched to upward to be connected to the pattern part P forming a circuit. The pattern part P can be desirably modified depending on configuration of the test board. Thus all of the connection metals 2 other than the pattern part P are connected to the ground pattern part 3, so that it is possible to prevent noise and to reduce impedance at the ground pattern part 3.
MASUI KEIJI
FUJII MITSURU
MURASE MAKOTO
