| 摘要 |
PROBLEM TO BE SOLVED: To sufficiently prevent a test signal with a prescribed frequency from leaking to another system. SOLUTION: This device is provided with a coupling part 11 for inputting a test signal having a prescribed frequency into an input and output line of an electronic equipment, and a decoupling part 13 having plural ring-type coils L1, L2, L3, L4 connected in series each other and having capacitors C3, C4 connected to the coils L1, L2, L3, L4, and for preventing the test signal from leaking to another system. Since the coils L1, L2, L3, L4 connected each other are increased in the winding number as tolal compared with one ring-type coil, inductance is increased, and the test signal input to the input and output line of the electronic equipment is prevented from leaking to another system.
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