Author: Noyafa–CCTV Tester
Overview of the purchase, use and maintenance knowledge of cable fault test instruments Any cable fault tester is aimed at the point of failure, but in terms of its testing process, it is generally divided into three steps: one is a rough measurement of the fault distance; the other It is to find the faulty cable buried cable fault test instrument purchase, use and maintenance knowledge overview Any cable fault tester is aimed at the fault occurrence point, but in terms of its testing process, it is generally divided into three steps: one is the fault distance is thick The other is to find the buried path of the faulty cable; the third is to precisely locate the failure point. Of course, in actual testing, these three steps are flexible according to field conditions. With cables buried, cable fault testers have become a must.
Initial cable fault roughing was performed using the bridge balance test principle. Back then, resistor bridges, capacitor bridges, low voltage bridges, high voltage bridges, etc. were used. Testing cable fault distance using the bridging principle was a common method used in the 1960s and 1970s.
After 2000, instruments using the bridge test principle continued to be used and developed. With the use of computer technology, there are now more intelligent bridge testers (such as high voltage digital bridges). In the 1970s and 1980s, cable fault testers were usually tested by the flash test method.
The principle is the pulse reflection method (also known as the radar method). The instruments used are mainly composed of electronic tubes and transistor circuits, and are large in size. The display used has an oscilloscope-type flash meter, a storage oscilloscope-type flash meter, and the like.
After the 1990s, with the wide application of computer technology, the intelligent cable fault tester (flash tester) was put into use, and the test principle used was still the pulse reflection method. The flasher is generally controlled by a single-chip microcomputer circuit from a picture tube to a liquid crystal display, which makes the rough test of cable faults enter a new realm.
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