Assembled type magnetic ring also said clip buckle type magnetic ring, clip buckle type magnetic ring of turns number select will whole beam cable through a ferrite magnetic ring on constitute has a total die chokes, according to need, also can will cable in magnetic ring above around several turns. turns number more more, on frequency lower of interference inhibit effect more good, and on frequency high of noise inhibition weaker. actual engineering in the, to according to interference current of frequency features to adjustment magnetic ring of turns number. usually Dang interference signal of band more wide Shi, can in cable put two a magnetic ring, Each around different turns, which inhibit high-frequency disturbances and low frequency interference. seen from the mechanism of common mode choke coil, its impedance greater interference suppression effect more obvious. impedance of common mode choke coil Lcm=jwLcm from common-mode inductor is not difficult to see from the formula, for a certain frequency of noise, magnetic inductance of bigger is better.