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    • 6. 发明专利
    • DIAGNOSIS UNIT FOR WIRING FAILURE
    • JPS557622A
    • 1980-01-19
    • JP7981378
    • 1978-07-03
    • AUTOMOBILE ANTIPOLLUTION
    • ENDOU AKIRATANIGAMI TAKAHIKOSEKI NAOYAHASEGAWA AKIRAURUNO KAZUNORIMIKIO HIROYUKI
    • G01R31/02G01R31/08
    • PURPOSE:To detect the wiring fautly point with a simple unit, by relating the distance to the faulty point and the change in the input impedance of wiring, by means of frequency. CONSTITUTION:When sinusoidal wave signal of a given amplitude is given to the wire harness 2 which is in short circuit at the point of l from the input terminal, from the sweep generator 4, the input impedance is changed with the change in frequency f, and the voltage Vo at the input terminal is a minimum at the point of Von/2l(where; n is a positive integer.) and minimum points are produced periodically every frequency distance Vo/2l. Accordingly, by detecting the frequency distance fo for the minimum points of voltage Vo, the distance l to the faulty point can be detected with l=Vo/2fo. Thus, the voltage detection circuit 6 detects the voltage Vo and the minimum voltage detection circuit 7 detects the minimum points of the voltage Vo and the memory circuits 8 and 9 memorize the frequency corresponding to the minimum points adjacent each other. Since the difference between the frequencies memorized shows the distance fd, the distance l to the faulty point can be known with the operation by the said equations by means of the conversion circuit 11.