EMERSON VE4003S2B2 Thyristor module

Where this is inadequate, double shields are normally used, providing shielding values as high as 120 dB. Radiated energy may still be coupled into a susceptible device through a shield of inadequate thickness, through holes penetrated for ventilation and other purposes, and through imperfectly jointed shielded sections. (2) Precise calculation of shielding effectiveness, even for perfectly joined solid shields, depends on the form of the shield and the type of field for which the shielding is to be used. Both electric and magnetic coupling can occur. Normally, it is relatively easy to provide electric shielding. Magnetic shielding, however, is more difficult to provide, particularly at frequencies below 100 kHz.

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