Detecting circuit for cable trouble

Abstract

Abstract PURPOSE:To detect nonvisually disconnection or nonconnection correctly in a short time by applying a pulse signal to signal lines of a cable assembly which have a disconnected or unconnected common potential line. CONSTITUTION:When none of common potential lines 6-1-6-n are disconnected or unconnected, the pulse signal generated by a pulse generating circuit 1 is transmitted as output pulse signals of linear amplifying elements 8-1-8-n, but diodes 10-1-10-n do not turn on and potential difference detecting resistors 9-1-9-n have no potential difference. Therefore, the pulse signal appears at none of output terminals 13-1-13-n. Then, if any of the common potential lines 6-1-6-n is disconnected or unconnected, the pulse signal generated by the circuit 1 is transmitted to the elements 8-1-8-n as well as in normal operation, but characteristic impedance is mismtached, so reflection is caused and diodes 10-1-10-n turn on only in the period of the reflection, so that the pulse signal appears at the output terminals 13-1-13-n. Consequently, the trouble of the cable is detected.

Inventors

• 👤 Yoshihiko Saruwatari
• 👤 猿渡　義彦

Bibliographic Details