In the sale of weak cables in the process, whether it is online or offline, many customers will ask to identify the quality of weak cables, how to identify:
1. Jacket: The surface can be seen inside the compacted network regular "roughness", indicating that the processing technology is good, will not have a relative sliding, is a good cable. The appearance of smooth, can not see the compaction of the network of "unevenness", pinch the sheath with a sense of looseness, poor cable;
2. Check the shielding network: Whether the number of braid braid network, check the solderability, tinned copper wire scratch look inside it is not copper, aluminum-magnesium alloy wire is significantly greater than the hardness of copper; network sparse, distribution Uneven, poor insulation and other packages are poor cable
3. Check the core: diameter - SYV cable is 0.78-0.8mm, SYWV cable is 1.0mm; recently there is a SYV75-5 core diameter is 1.0mm cable, the characteristic impedance of this cable is certainly not 75 Ohm, not applied to 75 ohm transmission system;
4. Check the cohesion of the core and the insulation layer: cut the insulation obliquely, according to the direction of stripping the core opened to see the core line and the insulation layer is not covered with the process material; good cable with a larger cohesion, poor Cable is not stained;
5. Longitudinal tensile test: take one meter cable, layer stripping the core wire, insulation, shielding layer, the outer sets, each leaving 10 cm long. The method is: Two hands hold the adjacent two layers of the cable separately, and pull them in the opposite direction; the general strength of the cable can not be pulled and the poor cable can be easily pulled out without any effort - Elevator cable is very important, "Elevator dedicated cable" there are problems in this area.
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