| 摘要 |
<p>PURPOSE:To search an object cable in a plurality of cables assuredly without being affected by electric current therein and external noise, even though the other cables are in a live condition. CONSTITUTION:When a searching signal is sent by a transmitter 1 to an object cable CA for search, induction voltage by the sent searching signal is induced at a sensor coil 3 which is set at a searching position. Commercial frequency component in the induction voltage is cut by a T type filter 21 of the transmitter 2, and the filtered induction voltage is amplified and then is separated into 210Hz signal and 250Hz signal by a 210Hz filter 23 and a 250Hz filter 24. When the 210Hz signal and the 250Hz signal are simultaneously input to a logic circuit 25, the logic circuit 25 actuates a light emitting diode 26 and an electronic buzzer 27 and therewith the logic circuit 25 makes to display that the cable CA to which the sensor coil makes approach, is the very cable of searching object.</p> |
