The role of shielding in interference control

Interference in the form of extraneous noise or transients can be controlled by enclosing the circuits to be protected in an electromagnetic shield. Shielding is the primary means of protection when the source of interference cannot be controlled, although the barrier or generalized shield may be created through the use of spatial separation and orthogonalization, or may be an actual metal shield. The amount of shielding required for intrasystem compatibility can be based on local sources of interference within the system. When the equipment shield prevents the local sources from affecting its internal circuits and prevents its internal circuits from affecting the local environment, it is compatible with that environment and with all other equipment having these characteristics. This establishes intrasystem electromagnetic compatibility