Cylindrical shaped magnetic ring magnetic pass turns number select is 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. in 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 magnetic around different of turns number, Such can while inhibit high frequency interference and low frequency interference. from total die chokes role of mechanism Shang see, its impedance more big, on interference inhibit effect more obviously. and total die chokes of impedance from total die inductance Lcm=jwLcm, from formula in the not difficult see, for must frequency of noise, magnetic ring of inductance more big more good. but reality is not so, because actual of magnetic ring Shang also has parasitic capacitor, it of exists way is and inductance parallel. Dang encountered high frequency interference signal Shi, capacitor of capacity anti-smaller, Magnetic inductance circuit, so that the common mode choke coil defunct. details refer to the following diagram:

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