| 摘要 |
<p>PROBLEM TO BE SOLVED: To make it possible to judge disconnection, thinning, short-circuit and mixed contact in the conductor of a sensor pattern with a simple system in a short inspection time, by giving an instruction for the sensor pattern to be selected and judging the defect of the conductor of the sensor pattern by a prescribed upper limit or upper and lower limit threshold values from a received voltage. SOLUTION: In a send-out analog switch 2, corresponding to inputted signals, the conductor 3 of one sensor pattern for sending out a current is selected from the conductors 3 of the sensor patterns arrayed plurally. Then, after measurement ended for the conductor 3 of one sensor pattern, by switching the send-out analog switch 7, the voltage generated in the conductor 3 of the sensor pattern is measured on the conductors 3 of all the sensor patterns. Thus, after a voltage value detected in an AS conversion circuit 9 is sent to a CPU 10, in the CPU 10, it is judged that the disconnection and the thinning, etc., are present for the conductor 3 of the sensor pattern for detecting the voltage larger than the prescribed upper limit threshold value.</p> |
