在有线电视电缆网络中,经常遇到人为在电缆上插针来盗接有线电视信号和用气枪将铅弹射入电缆形成电缆短路,直接影响到有线电视网络的正常运行。过去用目测方法很难找到短路点,只有重新更换这段电缆。这种方法即费工、费时,又浪费材料。对我们维护人员能用一种快捷实用的方法来判断电缆短路点是必要的。 现在将方法介绍如下:首先去掉有短路点电缆的两边连接器件,再用数字万用表的电阻档分别测电缆两端的环路电阻值,从A端测得阻值a,从B端 In CATV cable networks, it is often encountered that man-made pins on a cable are used to steal cable television signals and air bombs are injected into the cable to form a cable short-circuit, which directly affects the normal operation of the cable television network. In the past it was hard to find a short-circuit point by visual inspection, only to replace this cable again. This method is labor-intensive, time-consuming, and wasteful materials. It is necessary for our maintenance personnel to use a quick and practical method to determine the cable short-circuit point. Now the method is introduced as follows: First, remove the short-circuit point on both sides of the cable connecting devices, and then use the digital multimeter resistance profile cable loop resistance measured at both ends of the cable, measured from the A-end resistance a, B