通信电缆断点故障的测距系统设计

介绍了一种利用低压脉冲反射法测量通信电缆断点故障位置的方法,及89C52单片机建立电缆断点故障的测距系统.通过该系统控制发射高频脉冲,将脉冲波幅度提高,结合设备载波送入电缆,脉冲波在电缆中传播,遇到高阻的断点、终端点就会发生反射,反射波又经脉冲接收电路到达该系统.在线获取从发射脉冲波开始到接收反射脉冲波为止的时间,计算出电缆断点故障点的准确位置.该系统结构简单、操作简便、测距精度较高、应用效果良好.

Design of Distance-measuring System for Breakpoint Fault of Communication Cable

The method of measuring the distance of breakpoint fault of communication cable with low voltage pulse reflection and related system established by 89C52 single chip computer are presented. In this system, high frequency pulses were generated and the amplitude were raised. Through the carrier of the device, the pulse wave was sending into the cable. The wave would be reflected when it reached the breakpoint because of the high resistance. The reflective wave would be sent back to pulse receiving circuit in the system. By calculating the time period between sending and receiving of the wave, accurate position of the breakpoint could be determined. The system is in simple construetion and easy operation. It offers precise distance measurement and excellent effects.