EMC for Product Designers, Third Edition by Tim Williams

By Tim Williams

Tim Williams has labored for quite a few businesses as an digital layout engineer during the last twenty years. He has monitored the growth of the EMC Directive and its linked criteria because it used to be first made public. he's a member of the establishment of electric Engineers and now runs his personal consultancy, specialising in EMC layout and coaching. *Save funds on consultancy debts with this book*Practical advisor to imposing EMC in the product layout process*The top expert consultant to the EMC Directive -100% updated and trustworthy

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54 Standards If your product involves a radio device then you will need to have regard to one of these standards, and it can normally be used as a stand-alone document since it will typically cover both emissions and immunity. It will also cover the particular issues, such as exclusion bands, that arise when a general EMC requirement is applied to a radio receiver or transmitter. 3 CEN A few harmonized EMC standards are published by CEN, which is the European standards body for non-electrotechnical subjects.

Therefore any Member State can take immediate action to prohibit an offending apparatus from its own market, but sanctions against the company that put the apparatus on the market in another Member State are dependent on the deliberations of the Commission and on the enforcement practices of the latter Member State. 3 Interpretation As has already been indicated, the Directive is so widely drawn that many of its provisions have to be the subject of interpretation. You might expect that this interpretation would be the function of the EC or of the national implementing authorities, but it has been remarkably difficult to obtain answers to detailed questions EMC for Product Designers 35 of interpretation from such authorities, especially so when there is a technical dimension to the question.

From this information you will be able to draw up a test plan, which specifies in detail the version and configuration of the EUT and any associated apparatus, the tests that will be applied to it and the pass/fail criteria. 3. You can discuss this with your selected test house or your in-house test facility staff, and it will form the basis for your contract with them and also for the technical documentation required by the provisions of the Directive. 6. Knowing the requirements of the test plan will enable you to some degree to incorporate cost effective EMC measures into the product design, since the test limits and the points to which they will be applied will have been specified.

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