Radio frequency cables are connecting wires for signal transmission. It is widely used in common cable television lines, radio communication equipment and electronic devices related to wireless electronic equipment. Before purchasing large quantities of RF cables, the samples must be tested as necessary. In addition to using professional equipment, simple manual inspections can also be performed.
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1. Check the PVC sheath: the sheath is compressed, and the appearance of the braided net can be seen to be regular and uneven, indicating that the processing technology is good, and it is not easy to slip, which is a good cable; the appearance is relatively smooth, and the braided wire is not compressed. It is flat, and the sheath is loose when touched by hand, which is a substandard cable.
2. Inspect the shielding layer braiding: check whether the number of braiding braids is sufficient, check the solderability, and the tinned copper wire should be scraped off the coating to see if there is copper wire inside; the braiding is sparse, unevenly distributed, and not tightly wrapped with the insulating layer, etc. It is a substandard cable.
3. Check the core wire: diameter --- SYV cable is 0.78 to 0.8mm, SYWV cable is 1.0mm.
4. Check the adhesion between the core wire and the insulating layer: cut the insulating layer diagonally, and pull the core wire in the peeling direction to see if the core wire and the insulating layer have bonding process materials; good cables have greater adhesion and are unqualified The cables are not glued.
5. Longitudinal tensile test: Take a 0.5-meter cable, and unwrap the core wire, insulation layer, shielding layer, and outer sheath in layers, leaving 10 cm each. 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, and unqualified cables can be easily pulled out without much effort.