Cable Line Obstacle Test
Cable line obstacle testing can use test methods such as DC bridges, AC meters, or line pulse testers. Compared with the general DC test method and AC test method, the pulse test method has the following advantages:
Can determine line obstacles in a very short time; can determine the distance of obstacles with a high degree of accuracy; can distinguish the location of several obstacles at the same time; the operation is simple and convenient, easy to grasp, and the test results can be read directly from the indicator. However, it is not very effective to use pulses to check the barriers of poor line insulation, so it needs to be used in conjunction with other methods. Using a pulse tester to test line obstacles is to send a pulse voltage to the line under test. When the line that transmits the pulse encounters obstacles, it will reflect and reflect on the screen of the oscilloscope, which can be quickly and accurately determined. Distance and nature of obstacle points.
For various lines, the pulse propagation speed is a known number, so as long as the round-trip time on the pulse line is measured, the distance of the obstacle can be determined. In order to accurately measure the distance of the obstacle point, the instrument is equipped with a distance scale mark converted by the formula, so the distance from the obstacle point to the test point can be directly read.