Choose turns the whole bundle cable through a ferrite bead constitutes a common mode choke, if necessary, can also be in the ring on top of the cable around a few turns. The more turns, the lower frequency interference suppression effect, the better, but at higher frequencies the noise weak inhibition. In practical engineering, according to the frequency characteristics of the interference current ring to adjust the number of turns. Often when the band jamming signal is wide nave magnetic connector, two sets of ring on the cable, each surrounded by a different magnetic ring turns Wan Jiang connector, so you can simultaneously suppress high frequency interference and glitches . From the mechanism of action of the common mode choke point of view, the greater the impedance, the more obvious effects of interference suppression. The common mode choke coil impedance from the common mode inductance Lcm = jwLcm, from the formula is not difficult to see that, for a certain frequency noise magnetic connectors, magnetic inductance bigger the better. But the reality is not the case, because there is an actual ring parasitic capacitance, and its existence is parallel with the inductor. When faced with the high frequency noise, capacitive reactance is small, the magnetic inductance short circuit, so that the common mode choke useless. A magnetic ring appearance under normal lighting conditions may be checked by the visual method. External dimensions of the second magnetic ring with an accuracy of 0.02mm vernier caliper under normal lighting conditions tested. Comprehensive factor 3 ring with "CF-3A-type magnetic sorter" measured excitation current is set to 2.5A, the frequency of 40KHz. 4 laps four magnetic inductance is measured at 1 KHz frequency with "YD2810D type LCR digital bridge." 5 magnetic induced electromotive force with "UI100-frequency power source" and "UI9720 magnetic Dynamic Analysis System" under specified conditions, were measured. 6 [1] magnetic Curie point of use "YD2810D type LCR Digital Bridge" and the measurement precision oven. Fenggang magnetic connector _ Chong Xu Song Electronic Products Factory _ magnetic connector from Dongguan Shijie Xu Song Chong electronic products factory provided. Dongguan Shijie Xu Song Chong Electronic Products Factory (chuangxs.1688.com) (www.chuangxs.1688.com) is Dongguan, connectors leaders, over the years, the company is implementing the scientific management, innovation and development, honesty and trustworthiness policy, and satisfy customer needs. Song Chong-wook in electronic products plant leadership with the staff warmly welcome all inquiries negotiations to create electronic products factory Song Chong-wook a better future.