1. Check the integrity of the insulating medium
The cross section of the standard coaxial cable is very round, and the outer conductor of the cable and the aluminum foil are attached to the outer surface of the insulating medium. The more round the outer surface of the medium is, the smaller the gap between the aluminum foil and its outer surface is, and the less round the gap is, the larger the gap will be.
Practice has proved that the smaller the gap, the better the performance of the cable. In addition, the air in the large gap easily invades the shielding layer and affects the service life of the cable.
2. Measure the consistency of insulating medium of coaxial cable
The fluctuation of the medium diameter at the edge of the coaxial cable mainly affects the echo coefficient of the cable. This inspection can cut out the insulating medium of a section of the cable, and carefully check the outer diameter of each point with a micrometer to see if it is consistent.
3. Measuring the braided mesh of coaxial cable
The textile network cable of coaxial cable plays an important role in the shielding performance of the coaxial cable, and it is also the return line of the power supply in the centralized power supply cable TV line. Therefore, the quality inspection of coaxial cable must check whether the textile network is tight and flat.
The method is to cut the outer sheath of the coaxial cable, cut a small section of the coaxial cable braided mesh, and identify the number of braided meshes. , Under the same price, the thicker the wire diameter, the better the quality.
4. Check the quality of aluminum foil
The important shielding function of coaxial cable is aluminum foil, which plays an important role in preventing external open-circuit signal interference and cable TV signal confusion. Therefore, the quality of aluminum foil should be checked for new coaxial cables.
First, cut the sheath layer to observe whether the surface of the braided wire and the aluminum foil layer maintains a good luster; secondly, take a piece of cable, wrap it tightly around the metal small shaft, straighten it and turn it in the opposite direction, repeat several times, and then cut it open Check the cable sheath layer to see if the aluminum foil is cracked. You can also cut out a small section of aluminum foil and repeatedly rub and stretch it in your hand. After repeated rubbing and stretching, it still does not break. The one with certain toughness is a qualified product, otherwise it is a defective product. .
5. Check the extrusion tightness of the outer sheath
The outer sheath of high-quality coaxial cables is tightly wrapped, which can reduce the gap in the shielding layer, prevent oxidation caused by air entry, and prevent the relative sliding of the shielding layer from causing electrical performance drift, but too tight extrusion will cause inconvenience in stripping. , increasing the difficulty of construction.
The inspection method is to take a 1m long cable and remove the protective layer at the end, so that the core cannot be pulled out with force.
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