For the most common problem, which is radiated disturbance, EMC can be achieved in a number of ways. For example, the source or the victim equipment may in effect be removed from an area by rule or regulation (e.g., no cellular phones permitted). Alternatively, if some equipment emits more EM fields than intended or desired, it is possibile to reduce those emissions and therefore the level of disturbance for other equipment occupying the same environment. Note that for the purpose of not interfering with radio services worldwide, regulatory authorities set limits based on IEC guidelines.
Since avoidance techniques may not always be successful, however, it may be more effective to mitigate the effect of a disturbance (which causes undesired interference) by filtering or shielding, thereby increasing the immunity, or by some degree of redesign that ensures the problem is no longer significant to the exposed equipment.
Whatever the method, the aim always remains the same: to secure the proper functioning of equipment in the role for which it is designed, and which its users expect.
This is where the IEC makes a major contribution. IEC International Standards and other technical publications, for example, describe all the basic elements of the EMC problem, specify emission measurement methods, set emission limits, detail immunity testing techniques and test levels, and recommend protection (mitigation) methods either in general or for specific products.
To find out more follow the links in the section on How the IEC helps designers, installers and operators to ensure that their electrical and electronic devices, equipment and systems can all reliably function together to meet customer expectations.