When the frequency band of the interference frequency is wide, two magnetic rings can be set on the cable, each with a different number of turns, so that high-frequency interference and low-frequency interference can be suppressed at the same time. It can also be covered with nickel-zinc and manganese-zinc ferrite Therefore, the suppressed interference frequency band is wider.
The magnetic ring is fragile, so it needs to be fixed well during the installation process to avoid the rupture of the magnetic ring due to collision during transportation. We generally use cable ties to fix it.
Finally, the magnetic ring is only a commonly used component in EMC rectification to find the problem and use it only when necessary. Try to add capacitors and inductors in the design to eliminate interference from the source. Nothing is better.