| 摘要 |
PURPOSE:To inspect wiring, by simple constitution wherein each wiring pattern of a printed circuit board is regarded as an antenna and the disconnection or short-circuit of the wiring pattern is inspected from the receiving signal thereof. CONSTITUTION:After a good quality printed circuit board is mounted on an inspection stand, a current is emitted from a transmission antenna (x) by the driving of an oscillator 13 and impedance is adjusted by an impedance matching part 18 to obtain a resonant state. At this time, the max. receiving signal is inputted to a memory 20 through a receiver 19. By this method, a pin 17 is successively erected on all of wiring patterns, and the impedance value at this time and the value of the receiving signal are stored in the memory 20 as reference data. Next, a printed circuit board to be inspected is placed and, in the same way, a ratio wave is received by the receiver 19 and this receiving value is compared with the reference value read from the memory 20 by a comparator 21 to detect disconnection or short-circuit.
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