Check the tightness of the outer protective layer

High quality coaxial cable outer protective layer is wrapped very tightly, so that can narrow the gap in the shielding layer, prevent air into the cause of oxidation, prevent the shielding layer of relative sliding caused by electrical property drift, but squeeze too tight will cause stripping inconvenience, increase the difficulty of construction. The inspection method is to take 1m long cable and remove the protective layer at the end, so as not to pull out the core is appropriate