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How to identify the good and bad weak cables?

Categorization:Product Information       

Specializing in the sales of: Connectors | Wire Harness | Cable Products

First, the visual appearance of identification: 1. PVC sheath: the surface can be seen inside the compression of the braided network has a regular "unevenness", indicating that the processing technology is good, will not produce relative sliding, is a good cable. Smooth appearance, can not see the "unevenness" of the compression netting, pinch the sheath with a loose feeling, is poor cable; 2. Check the shielding layer netting: whether the number of braided copper netting enough to check the weldability, tinned copper wire scraping to see if it is not inside the copper wire, aluminum-magnesium alloy wire hardness is significantly greater than the copper wire; netting sparse, uneven distribution, with the insulation layer package Not tight, etc. is poor cable; 3. check the core wire: diameter - SYV cable for 0.78-0.8mm, SYWV cable for 1.0mm; recently appeared a kind of SYV75-5 core wire diameter is 1.0mm cable, the characteristic impedance of this cable is certainly not 75 ohms, should not be used to 75 ohms transmission system; 4. check the core wire: the diameter of the core wire is 0.78-0.8mm, the diameter of the core wire is 1.0mm. System; 4. check the core wire and insulation layer of the adhesion: cut the insulation layer diagonally, according to the peeling direction of the core wire, see the core wire and insulation layer there is no staining process materials; good cable has a larger staining force, the poor cable is not stained; 5. longitudinal tensile strength test: take a meter of the cable, peeled off the core wire, insulation, shielding layer, the outer household sleeve, each left 10 centimeters long. Method is: two hands respectively hold the cable adjacent to the two layers, pull in the opposite direction; good cable general power to pull, poor cable can be easily pulled out without great effort - elevator cable this one is very important, many of the so-called "elevator special cable" are there! This is very important, many of the so-called "elevator cable" have problems in this area.

-Second, with the fire test 1. For how to distinguish whether the cable products are added with fake copper wire, for consumers is a major difficulty. Now on the market a wide variety of fake copper wire, and high simulation, the average consumer simply can not distinguish between good and bad. Below through the collection of three types of fake copper wire, consumers in the purchase, you can avoid these three types of cable products. 2. General fake copper wire: copper-clad aluminum, copper-clad aluminum magnesium alloy, copper-clad steel, copper-clad iron, 3. High imitation of fake copper wire: multi-stranded copper wire line according to a certain percentage of the copper-clad aluminum-magnesium alloy, the other materials are processed through the electroplating of copper after the material, the general price of the last one to be a lot more expensive than the after all, there is a real copper in the 4. not up to standard copper wire: the material is not made of oxygen-free copper wire drawing, transmission performance is not good, or is not enough cores, etc. If in the purchase, forget the classification of the three kinds of fake copper wire, you can also try the following method: true and false SYV, RVV and other copper wire can be the same as the fire to identify the authenticity of the first toggle a section of the line to reveal a section of the copper wire out and split them sparsely (that's better), generally more expensive than the previous one after all, there is real copper in the inside. That way the effect is better), generally with a windproof lighter a burn, it will appear. Real copper wire is very high temperature, more than a minute no problem, at most, the color will change a little; if it is copper-clad aluminum, copper-clad aluminum-magnesium alloy will soon bend down; if it is copper-clad steel, copper reported that the kind of iron burned after a knife to scrape the shape.

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