Passing the entire bundle of cables through a ferrite magnetic ring constitutes a common mode choke coil. According to requirements, the cable can also be wound several turns on the magnetic ring. The more the number of turns, the better the suppression effect on lower frequency interference, and the weaker the suppression effect on higher frequency noise. In actual engineering, the number of turns of the magnetic ring should be adjusted according to the frequency characteristics of the interference current. Usually when the frequency band of the interference signal is relatively wide, two magnetic rings can be put on the cable, and each magnetic ring has a different number of turns, so that high-frequency interference and low-frequency interference can be suppressed at the same time.

To test the magnetic loop inductance, you must wind the copper wire to test, and it is also the only test method, so that the accuracy of the test is relatively high. The performance of different sizes of copper wires is different, and how many turns are wound. , One more circle or one less circle has different effects. The key is to test around the yi circle, what is the inductance of a single circle, and the rest is easy to handle. Some properties cannot meet the requirements of the product, so we have to start with the material. The material is the most critical. Different materials, amorphous and nanocrystalline magnetic rings, have different effects.

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