Check the quality of the aluminum foil

In coaxial cable, aluminum foil plays an important role in shielding, which plays an important role in preventing the interference of external open circuit signals and the confusion of cable TV signals. First, the sheath layer was cut open to observe whether the surface of the braided wire and aluminum foil layer maintained good luster; Followed by a cable, tightly around on the small metal shaft, straight to the reverse turn around, repeated several times, then cut open watch cable sheath layer of aluminum foil with and without fracture phenomenon, can also be cutting out a small piece of aluminum foil and repeatedly rub it in your hand and stretch, after repeated rubbing and tensile fracture, is still not certain toughness for qualified products, or for defective goods