The main problems in ensuring electromagnetic compatibility of electronics products lie in containing the emissions of internally-generated but unwanted high frequencies, and in preventing transient and radio frequency interference imported from the external environment from causing noticeable degradation in the quality of analogue signals, or corruption of digital processes. A further requirement which will come under the umbrella of the EMC Directive is that the wave shape of the mains supply input current should be limited in its harmonic content. All of these aspects can be dealt with satisfactorily if they are considered as an integral part of the product's specification through the design phase. Too often, because they do not affect the performance of the product under nominal (ideal) operating conditions, they are considered until the design is substantially complete and production is about to start. Incorporating EMC principles as an afterthought is expensive and time-consuming.
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