How to easily identify the quality of weak current cables

How to easily identify the quality of weak current cables

There are more and more fake goods in the market, making consumers sad. For weak current cables, many merchants sell all copper cables, but they sell dog meat. We understand that the counterfeit weak current cables on the market are divided into fake copper wires, high imitation fake copper wires, and substandard copper wires.

Generally, fake copper wires include copper clad aluminum, copper clad steel, copper clad iron, etc. High imitation fake copper wires are copper wires with copper clad aluminum and magnesium alloys in proportion to a certain proportion. other materials are post-plating copper materials, the general price is much more expensive than the previous one. After all, there is real copper inside. copper wires that do not meet the standards are not made of oxygen-free copper, and the transmission performance is not good, or the number of cores is not enough.

When selling so many fake cable products, many customers may ask questions about quality of weak current cables, whether online or offline. How can this problem be identified?

1. Jacket: the surface energy shows that there is a regular "non-flat" in the compress, which indicates that the processing technology is good and there will be no relative slide. It is a good cable. Smooth appearance, unable to see the compression of the knitting network "not flat", with a hand-held jacket with loose motion, is a poor cable;

2. check the screen knitting Network: Check whether the number of copper knitting network is sufficient. Check the solderability. Check whether the copper wire is copper. The hardness of the aluminum-magnesium alloy wire is significantly higher than that of the copper wire. The Knitting network is sparse and unevenly distributed, it is a poor cable that is not tightly wrapped with the insulation layer;

3. check core cable: syv cable diameter is 0.78-0.8, sywv cable is 1.0; recently a syv75-5 core wire diameter is 0mm, this cable characteristic impedance, it must not be 75 ohm and should not be used in a 75 ohm transmission system;

4. check the adhesion between the core wire and the insulation layer: diagonal cut the insulation layer, pull the core wire in the Strip direction, check whether the core wire and the insulation layer are coated with process materials; good cables have a large adhesion, the cable is not contaminated;

5. longitudinal tensile test: Take a cable of one meter and strip the core line, insulation layer, screen layer, and external cover, each with a length of 10 centimeters. The method is as follows: Hold the adjacent two layers of the cables in two hands and pull them in the opposite direction. Good cables generally do not move with force, differential cables can be easily pulled out without much effort-Elevator cables are very important, and many so-called "dedicated Elevator cables" have such problems.