Coaxial cables are inevitably used in home decoration wires. Compared with strong electric wires such as plastic copper wires, we do not know much about weak currents. Today, Xiaobian Yinglian will tell you in detail how to test the quality of coaxial cables. .

1. Observe 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 function of the cable. In addition, the large gap air simply 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 will affect 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 the coaxial cable plays an important role in the shielding function of the coaxial cable, and it is still the return line of the power supply in the centralized power supply cable TV line. Therefore, the quality inspection of the coaxial cable must observe whether the textile network is tight and flat. The method is to cut open 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 aluminum foil plays an important role in shielding the coaxial cable. It plays an important role in avoiding the interference of external open-circuit signals and the convergence of cable TV signals. Therefore, the quality of the 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 will not break, and the product with certain toughness is qualified, 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 packed, which can narrow the gap in the shielding layer, avoid oxidation caused by air entry, and avoid the relative sliding of the shielding layer causing electrical function 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 cut off the sheath at the end, so that the core cannot be pulled out with force.

6. Check the shape of the cable loop

        Cable loops are not just an aesthetic issue. And it's also a quality issue. The cables are flat in a circle, each cable is kept on the same concentric plane, and the cables are in parallel and arc-shaped contact with each other, which can reduce the mutual stress on the cables, and it is not easy to be deformed and damaged when stacked. Therefore, it should not be taken lightly when checking the quality of cables. .