By Tim Williams
Broadly considered as the traditional textual content on EMC, Tim Williams' publication offers the entire details essential to meet the necessities of the EMC Directive. most significantly, it indicates find out how to include EMC layout ideas into items, warding off fee and function consequences, assembly the wishes of particular criteria and leading to a greater total product.
This variation covers easy, known and product-specific attempt criteria, the newest criteria on dimension tools and revisions to current criteria. alterations to the factors producing approach also are lined. New dimension concepts are defined. The bankruptcy entitled platforms EMC explains standards on platforms layout, structure of huge platforms, earthing, grounding and bonding practices, cable structure, routing and termination, and specification of parts. one more bankruptcy offers with EMC administration: dialogue of administration necessities, corporation coverage, QA wishes, the function of the EMC co-ordinator, together with try out and regulate plans.
Tim Williams has labored for quite a few businesses as an digital layout engineer over the past two decades. 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. he's additionally the writer of 'The Circuit Designer's spouse' released via Butterworth-Heinemann.
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Greatly considered as the traditional textual content on EMC, Tim Williams' e-book offers all of the info essential to meet the necessities of the EMC Directive. most significantly, it exhibits find out how to include EMC layout ideas into items, heading off rate and function consequences, assembly the wishes of particular criteria and leading to a greater total product.
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Additional info for EMC for Product Designers
The energy present in the spark depends on the field strength, and hence on the distance from the transmitter, and on the antenna efficiency of the metal structure. BS 6656  discusses the nature of the hazard and presents guidelines for its mitigation. Similarly, electro-explosive devices (EEDs) are typically connected to their source of power for detonation by a long wire, which can behave as an antenna. Currents induced in it by a nearby transmitter could cause the charges to explode prematurely if the field was strong enough.
1 EEDs and flammable atmospheres The first is the hazard of ignition of flammable atmospheres in petrochemical plant, or the detonation of electro-explosive devices in places such as quarries, due to incident RF energy. A strong electromagnetic field will induce currents in large metal structures which behave as receiving antennas. A spark will occur if two such structures are in intermittent contact or are separated. If flammable vapour is present at the location of the spark, and if the spark has sufficient energy, the vapour will be ignited.
Thus items from a product line that was launched at any time before 1996 had to comply with the provisions of the first Directive after 1st January 1996. Put another way, there is no “grandfather clause” which exempts designs that were current before the Directive took effect. However, products already in use before 1st January 1996 do not have to comply retrospectively. The transitional provisions for the second EMCD are that you can use the methods of compliance of either, from 20th July 2007 up to 20th July 2009.
EMC for Product Designers by Tim Williams