EMC for Product Designers, Third Edition by Tim Williams

By Tim Williams

Tim Williams has labored for various businesses as an digital layout engineer over the past twenty years. He has monitored the growth of the EMC Directive and its linked criteria because it was once 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 consultant to enforcing EMC in the product layout process*The best specialist consultant to the EMC Directive -100% up to date and trustworthy

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Example text

It would be perfectly in order to choose some tests, perhaps those involving RF emissions or immunity, to be performed outside while others such as transient, ESD and mains disturbance immunity are done in-house. 3 Competent bodies If you choose the technical file route then you have to involve an independent competent body. The Directive lays down a number of requirements that must be met by anyone seeking competent body status: • availability of personnel and of the necessary means and equipment; • technical competence and professional integrity; EMC for Product Designers 41 • independence of staff and technical personnel in relation to the product in question; • • maintenance of professional secrecy; possession of civil liability insurance.

Tests Enclosure: radiated emissions from 30 to 1000MHz as per EN 55022 Class B; applicable only to apparatus containing processing devices operating above 9kHz AC mains port: conducted emissions from 150kHz to 30MHz as per EN 55022 Class B Discontinuous interference on AC mains port measured at spot frequencies as per EN 55014, if relevant Mains harmonic emission measured as per EN 60555 part 2 (note that application is limited by the scope of EN 60555-2) NB an informative annex references tests which will be proposed for inclusion in the standard when the relevant reference standards are published.

Of course the manufacturer will normally need to test the product to assure himself that it actually does meet the requirements of the standards, but this could be done in-house. Many firms will not have sufficient expertise or facilities in house to do this testing, and will therefore have no choice but to take the product to an independent test house. 4. But the long term aim ought to be to integrate the EMC design and test expertise within the rest of the development or quality department, and to decide which standards apply to the product range, so that the prospect of self certification for EMC is no more daunting than the responsibility of functionally testing a product before shipping it.

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