The cross section of the coaxial cable is very round, and the outer conductor of the cable and the aluminum plate 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 smaller the gap is, the larger the gap is. Practice has proved that the smaller the gap, the better the performance of the cable. In addition, the large gap air easily invades the shielding layer and affects the service life of the cable.
2. Measure the consistency of the insulating medium of the coaxial cableThe fluctuation of the dielectric diameter of the coaxial cable mainly affects the echo coefficient of the cable. This inspection can cut off the insulation medium of a cable. Use a micrometer to carefully check the outer diameter of each point to see if it is consistent.
3. Measuring the woven mesh of the coaxial cableThe textile cable of the coaxial cable plays an important role in the shielding performance of the coaxial cable. In the centralized power supply cable TV line, it is also the return line of the power supply. Therefore, the quality inspection of the coaxial cable must check whether the textile mesh is tight and flat. Is to cut the outer sheath of the coaxial cable, cut a small section of the coaxial cable woven mesh, identify the number of woven mesh, if it is qualified with the given index value, and measure the single textile wire with a spiral micrometer, At the same price, the coarser the wire diameter, the better the quality.
4, check the quality of aluminum foilThe important shielding function in the coaxial cable is aluminum foil, which plays an important role in preventing external open circuit signal interference and cable television signal condensation. Therefore, the quality of the aluminum foil should be checked for the new coaxial cable. First, cut off the jacket layer and observe whether the surface of the braided wire and aluminum foil layer maintains good luster. Secondly, take a cable and tightly wrap it around the small metal shaft, straighten and reverse the winding, repeat it several times, then cut it again. The cable sheath layer can be seen to see if the aluminum foil is cracked. It can also be cut out of a small piece of aluminum foil repeatedly twisted and stretched in the hands. After repeated twisting and stretching, it is still not broken, and it has a certain toughness for cogging, otherwise it is a defective product. .
5, check the tightness of the outer sheathThe high-quality coaxial cable outer sheath is tightly packed, which can reduce the gap in the shielding layer, prevent the air from entering and cause oxidation, prevent the relative sliding of the shielding layer from causing the electrical performance to drift, but the tightness of the extrusion will cause the inconvenience of the stripping. Increase the difficulty of construction. The inspection method is to take a cable of 1 m length and remove the sheath at the end, so that the core cannot be pulled out with force.
6, check the cable into a ring shapeCable looping is not only an aesthetic issue. And it is also a quality issue. The cable is flattened in a circle, and each cable is kept on the same concentric plane. The cable and the cable are in parallel contact with each other in an arc, which can reduce the mutual force of the cables, and the stacking is not easily deformed and damaged. Therefore, it is not taken lightly when accepting the cable quality. .
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