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磁场形式的电磁干扰一般引起阴极射线管电子束的颤动。使用适当形状和厚度的高磁导率材料制成的屏蔽罩,这个问题就容易地得到解决。磁干扰是由变压器、电源、电机和汇流条等低阻抗场源所引起。在磁屏蔽问题上存在着两种选择:对干扰源或对被干扰部件进行屏蔽。如果存在着多个干扰源,或在以后可能会遇到这些干扰源,则应对偏转线圈也进行施蔽。如果是由单一的干扰源如变压器发射的场,那么对变压器屏蔽要比对偏转线圈屏蔽合算一些。
Electromagnetic interference in the form of magnetic fields generally causes chattering of the cathode ray tube electron beam. This problem can easily be solved by using a shield made of a high permeability material of suitable shape and thickness. Magnetic interference is caused by low impedance field sources such as transformers, power supplies, motors, and bus bars. There are two options for magnetic shielding issues: shielding the source of interference or the part being interfered with. Deflection coils should also be shielded if there are multiple sources of interference or may be encountered in the future. In the case of a field emitted by a single source of interference, such as a transformer, shielding of the transformer is more cost-effective than shielding the deflection yoke.