When customers buy wires and cables, whether they are buying online or offline, one of the most concerned issues is the quality of the wires and cables, especially the weak current cables, because the poor quality of the weak current cables is more likely to cause serious problems. Baotuquan Cable Group will explain to you some experience on how to distinguish the quality of weak current cables.

1. Sheath: The surface can see the regular "unevenness" of the braided net inside the compression, indicating that the processing technology is good, and there is no relative sliding, and it is a good cable. The appearance is smooth, the "unevenness" of the compressed braid is not visible, and the sheath is loose when pinched by hand, which is a bad cable;

2. Check the braiding of the shielding layer: whether the number of braiding is sufficient for braiding the copper wire, check the solderability, scratch the tinned copper wire to see if it is copper wire inside, the hardness of the aluminum-magnesium alloy wire is obviously greater than that of the copper wire; the braided wire is sparse and distributed Uneven, not tightly wrapped with the insulating layer, etc. are bad cables

3. Check the core wire: diameter-SYV cable is 0.78-0.8mm, SYWV cable is 1.0mm; recently there has been a SYV75-5 cable with a core wire diameter of 1.0mm. The characteristic impedance of this cable is definitely not 75 Ohm, not applied to 75 Ohm transmission system; 　　

4. Check the adhesion force between the core wire and the insulating layer: cut the insulating layer diagonally, pull the core wire in the peeling direction, and see if the core wire and the insulating layer are bonded to the process materials; good cables have larger adhesion strength, poor The cable does not stick; 　　

5. Longitudinal tensile test: take one meter of cable, strip the core wire, insulation layer, shielding layer, and outer jacket in layers, leaving each 10 cm long. The method is: hold the two adjacent layers of the cable with two hands and pull them in opposite directions; good cables generally cannot be pulled by force, but poor cables can be easily pulled out without much effort-the elevator cable is very important, many so-called "Elevator cables" all have this problem.