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How to identify the quality of monitoring cables
1. PVC jacket: The surface can see the regular "unevenness" of the netting inside the net, which means that the processing technology is good and no relative slipping will occur. It is a good cable. The appearance is smooth, can't see the "unevenness" of the compacted net, and the looseness of the sheath is caused by hand, which is a poor cable;
2, check the shielding layer mesh: whether the number is enough? Copper wire mesh, check the solderability, tinned copper computer wire scraping to see if it is copper wire, aluminum-magnesium alloy wire hardness is significantly greater than the copper wire; network sparse , uneven distribution, and the insulation layer is not tight, such as poor cable;
3, check the core: diameter - SYV cable is 0.78-0.8mm, SYWV cable is 1.0mm; recently appeared a SYV75-5 core diameter is 1.0mm cable, the characteristic impedance of this cable, certainly not 75 Ohm, not applied to 75 ohm transmission systems;
How to identify the quality of monitoring cables
4. Check the binding force between the core wire and the insulating layer: Cut the insulation layer obliquely, pull the core wire in the direction of peeling, and see if the core wire and the insulation layer are covered with the process material; good cable has a large binding force, poor The cable is not covered;
5. Longitudinal tensile test: Take one meter cable, peel the core wire, insulation layer, shielding layer, and outer cover in layers, leaving 10 cm long. The method is: Two hands hold the adjacent two layers of the cable and pull in the opposite direction; the cable is generally unable to pull the power, so the cable can be easily pulled out without any effort.
The quality of the monitoring cable can be identified from the following five aspects: PVC sheathing, shielding layer braiding, core wire, core wire and insulating layer adhesion, and longitudinal tensile test.
How to identify the quality of the monitoring cable
Identifying good or bad monitoring cables requires specialized equipment and instruments that are not available to design and engineering organizations. How can we identify the quality of the monitoring cable by some simple methods?