Coaxial wire refers to a wire with two concentric conductors, and the conductor and the shielding layer share the same axis. When purchasing coaxial cables, most people pay more attention to its electrical performance indicators, but in fact, the impact of its structural indicators on performance is also very obvious. And the inspection of the appearance structure is more convenient and does not require much equipment. TXGA introduces you to six structural indicators for purchasing coaxial cables.
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1. Observe the roundness of the insulating medium. The cross-section of standard coaxial cable is very round. The outer conductor and aluminum foil of the cable are attached 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 outer surface, and the less rounded the larger the gap. Practice has proved that the smaller the gap, the better the performance of the cable. In addition, the large gap air is likely to invade the shielding layer and affect the service life of the cable.
2. Detect the consistency of the insulation medium of the coaxial cable. The fluctuation of the diameter of the coaxial cable insulation medium mainly affects the return loss of the cable. This inspection can cut out the insulation medium of a section of the cable, and carefully check the outer diameter of each point with a micrometer to see if it is the same.
3. Detect the braided net of the coaxial cable. The braided wire of the coaxial cable plays an important role in the shielding performance of the coaxial cable. The quality inspection of the coaxial cable must check whether the braided net is tight, uniform and flat. The method is to cut the outer sheath of the coaxial cable and cut a short section. Coaxial cable braided net, the number of braided nets and wire diameters are appraised, if it matches the given index value, it is qualified, and if it is less than or finer than the given index value, it is unqualified. In addition, a spiral micrometer is used to measure a single braided network cable. At the same price, the thicker the wire diameter, the better the quality.
4. Check the quality of aluminum foil. Lead foil plays an important role in coaxial cable shielding. It plays an important role in preventing external open-circuit signal interference and cable TV signal leakage. Therefore, the quality of aluminum foil should be checked for new coaxial cables. First, open the sheath layer to observe whether the surface of the woven mesh wire and aluminum foil layer maintains a good gloss. The second step is to take a section of the cable and wind it tightly on the small metal shaft, straighten it and turn it in the opposite direction, repeat it several times, and then cut the cable sheath to see if the aluminum foil is broken or not. You can also cut out a small section of the aluminum foil. The hand is repeatedly rubbed and stretched. After repeated rubbing and stretching, it has not broken. The one with fixed toughness is qualified, otherwise it is inferior.
5. Check the tightness of the outer sheath. The outer sheath of high-quality coaxial cable is tightly wrapped, which can reduce the gap in the shielding layer, prevent air from entering and causing oxidation, and prevent the relative sliding of the shielding layer from causing electrical performance drift. However, squeezing the package too tightly will cause inconvenience in stripping. , Increase the difficulty of construction. The inspection method is to take a 1 m long cable, peel off the protective layer at the end, and use force to not pull out the core is appropriate.
6. Observe the loop shape of the cable. Looping of cables is not only an aesthetic issue, but also a quality issue. The cables are looped and flat, and the cables are kept on the same concentric plane. The cables and the cables are in circular arc parallel and overall contact, which can reduce the mutual force of the cables, and the stacking is not easy to deform and damage, so this is not allowed when checking the quality of the cables. Take it lightly.
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