Tips for measuring coaxial cable quality
1. Coaxial Cable The standard of the whole degree of insulating dielectric
The cross-section of the coaxial cable is rounded, and the outer conductor of the cable is attached to the exterior surface of the insulating medium. The more round the surface of the media, the smaller the gap between the aluminum foil and its exterior, the greater the gap between the whole. The practice proves that the better the performance of the smaller cables, the greater clearance air is easy to invade the shielding layer and affect the service life of the cable.
2, Coaxial Cable measurement of coaxial cable insulation media consistency
The dielectric diameter fluctuation of the coaxial cable margin mainly affects the echo coefficient of the cable, which can be used to inspect the insulating medium of a cable, and check out the diameter of each point carefully and see whether it is consistent with micrometer.
3, Coaxial Cable measuring coaxial cable weaving network
The coaxial cable's textile cable plays an important role in the shielding performance of the coaxial cable, but also in the centralized power supply CATV line or the return route of the power supply, so the coaxial cable quality inspection must be inspected on whether the textile net is tight and flat, and the method is to open the outer sheath of coaxial cables, shear a small section of coaxial cable weaving network, the number of woven network identification, if the value of the indicators to match to the qualified, in addition to a single textile cable with the spiral micrometer measurement, the same price, the thicker the diameter of the better quality.
4, Coaxial Cable check the quality of aluminum foil
The important shielding effect of coaxial cable is aluminum foil, it has an important role in preventing external open circuit signal jamming and CATV signal dew, so the quality of aluminium foil should be inspected for new coaxial electric decree. First, open the sheath layer, observe the weaving network cable and the surface of aluminum foil to maintain a good gloss; Next is to take a piece of cable, tightly wrapped around the metal axis, pulling straight back to the reverse, repeated several times, and then cut open the cable sheath to watch the aluminum foil cracking phenomenon, can also be a small section of aluminum foil in the hands of repeated rubbing and stretching, after repeated rubbing and stretching is still not broken, with a certain toughness for co-operation vomit, otherwise defective.
5, Coaxial Cable check out the tightness of the retaining layer
High-quality coaxial cable jacket is packed tightly, so that the shielding layer can be reduced to prevent the air into the oxidation, to prevent the relative sliding shielding layer caused by the electrical performance drift, but squeezing too tight will cause the inconvenience of stripping, increase the construction difficulty. Check the method is to take 1m long cable, in the end to protect the layer, to force can not pull the core for the right.
6, Coaxial Cable check the cable circle shape
Cable circles are not only a beautiful problem. And it's also a quality problem. The cable is flat, each cable stays in the same concentric plane, the cable and the cable into the circular arc parallel to the overall contact, can reduce the cable mutual force, stacking is not easy deformation damage, so in the acceptance of the quality of the cable should not be taken lightly.