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1, Inspect the insulation medium of the whole degree
Standard coaxial cable cross section is very round, the outer conductor of the cable, aluminum foil affixed to the outer surface of the insulating medium. The more rounded the outer surface of the medium, the smaller the gap between the aluminum foil and its appearance, the more rounded the gap is. Practice has proved that the smaller the gap the better the performance of the cable, in addition, large gap air easily invaded the shield and infect the service life of the cable.
A simple way to detect the quality of a coaxial cable
2, measured the same coaxial cable insulation medium
Coaxial cable edge diameter fluctuations of the main points of infection of the echo coefficient of the cable, this inspection can be cut off a section of cable insulation medium, carefully check with a micrometer diameter of each point to see if it is the same.