1, observe the integrity of the insulation medium

Standard coaxial cable section is very round, cable outer conductor, aluminum stick to the outer surface of the insulating medium. The rounder the outer surface of the medium, the smaller the gap between the aluminum foil and its appearance, and the larger the gap is. Practice has proved that the smaller the gap, the better the performance of the cable, in addition, large gap air is easy to invade the shielding layer and affect the service life of the cable.

2, test the consistency of coaxial cable insulation medium

Coaxial cable edge medium diameter fluctuation mainly affects the cable echo coefficient, this check can be cut out a section of cable insulation medium, with micrometer carefully bolt check each point diameter, see whether it is consistent.

3, test the woven network of coaxial cable

Coaxial cable for coaxial electric purport of textile cable shielding performance plays an important role, and in the centralized power supply cable lines or power back to the line, so the coaxial cable of the quality testing must be carried out whether textile net closely flat view, method is to cut open coaxial cable outer sheath, cut a small section of the coaxial cable of the woven mesh, woven mesh number for identification, If it is consistent with the given index value, it is qualified. In addition, the single textile network cable is measured with a spiral micrometer. Under the same price, the thicker the wire diameter, the better the quality.

4, check the quality of aluminum foil

Aluminum foil plays an important role in shielding coaxial cable. It plays an important role in preventing interference of external open circuit signal and exposure of cable TV signal. Therefore, the quality of aluminum foil should be checked for new coaxial cable. First, the sheath layer was cut open to observe whether the surface of the woven network cable and aluminum foil layer maintained a good gloss; 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, still not has a certain toughness for cooperation oh, otherwise for defective goods.

5. Check the tightness of the outer protective layer

High quality coaxial cable outer protective layer is wrapped very tight, so that can reduce the gap in the shield layer, prevent air into oxidation, prevent the relative sliding of the shield layer caused by electrical performance drift, but the squeeze too tight will cause the inconvenience of stripping, increase the difficulty of construction. Check the method is to take 1m long cable, at the end of the purge layer, to force can not pull out of the core as appropriate.

6. Observe the circular shape of the cable

Looped cables are not just an aesthetic problem. And it's also a quality problem. The cable is flat in the circle, the cables are kept in the same concentric plane, and the whole contact between the cables is parallel to the arc, which can reduce the mutual force of the cables, and it is not easy to pile up deformation damage, so it can not be taken lightly in the acceptance of cable quality.