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In the process of selling weak current cables, whether online or offline, many customers will ask to identify the quality of weak current cables, how to identify:
1.
Sheath: The surface can see the regular "unevenness" of the pressing inside the mesh, indicating that the processing technology is good, will not produce relative slippage, and is a good cable
.
The appearance is smooth, the "unevenness" of pressing the mesh can not be seen, and the sheath is loose when pinched by hand, which is a poor cable;
2.
Check the shielding layer meshing: whether the number of knitting is enough for copper meshing, check the weldability, tinned copper wire scrape to see if it is copper wire, the hardness of aluminum-magnesium alloy wire is obviously greater than that of copper wire; The network is sparse, the distribution is uneven, and the insulation layer is not tightly wrapped is a poor cable
3.
Check the core wire: diameter - SYV cable is 0.
78-0.
8mm, SYWV cable is 1.
0mm; Recently, there is a SYV75-5 core diameter of 1.
0mm cable, the characteristic impedance of this cable, certainly not 75 ohms, not applied to 75 ohm transmission system;
4.
Check the adhesion force between the core wire and the insulation layer: cut the insulation layer diagonally, pull the core wire in the direction of peeling, and see if the core wire and the insulation layer are bonded to the process material; Good cables have a large adhesion force, but poor cables do not adhesion;
5.
Longitudinal tensile test: take one meter of cable, peel off the core wire in layers, insulation layer, shielding layer, outer household cover, and leave 10 cm long
each.
The method is: hold the adjacent two layers of the cable with both hands and pull in opposite directions; Good cables generally can't be pulled, and poor cables can be easily pulled out without much effort - elevator cables are very important, and many so-called "elevator special cables" have problems in this regard;
In the process of selling weak current cables, whether online or offline, many customers will ask to identify the quality of weak current cables, how to identify:
Weak current cable1.
Sheath: The surface can see the regular "unevenness" of the pressing inside the mesh, indicating that the processing technology is good, will not produce relative slippage, and is a good cable
.
The appearance is smooth, the "unevenness" of pressing the mesh can not be seen, and the sheath is loose when pinched by hand, which is a poor cable;
2.
Check the shielding layer meshing: whether the number of knitting is enough for copper meshing, check the weldability, tinned copper wire scrape to see if it is copper wire, the hardness of aluminum-magnesium alloy wire is obviously greater than that of copper wire; The network is sparse, the distribution is uneven, and the insulation layer is not tightly wrapped is a poor cable
3.
Check the core wire: diameter - SYV cable is 0.
78-0.
8mm, SYWV cable is 1.
0mm; Recently, there is a SYV75-5 core diameter of 1.
0mm cable, the characteristic impedance of this cable, certainly not 75 ohms, not applied to 75 ohm transmission system;
4.
Check the adhesion force between the core wire and the insulation layer: cut the insulation layer diagonally, pull the core wire in the direction of peeling, and see if the core wire and the insulation layer are bonded to the process material; Good cables have a large adhesion force, but poor cables do not adhesion;
5.
Longitudinal tensile test: take one meter of cable, peel off the core wire in layers, insulation layer, shielding layer, outer household cover, and leave 10 cm long
each.
The method is: hold the adjacent two layers of the cable with both hands and pull in opposite directions; Good cables generally can't be pulled, and poor cables can be easily pulled out without much effort - elevator cables are very important, and many so-called "elevator special cables" have problems in this regard;