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They deal with “what” and “how” issues, rather than with why they are needed or why they work. The following outlines a number of the most important best-EMC-practices. Rewards are there for those that can take the pace. But new electronics technologies are creating the worlds largest market, expected to exceed US$1 trillion annually in value (that’s $1 million million) within a couple of years and continue to increase at 15% or so per annum after that.

There is no escaping the ratcheting effects of new electronic technologies if a company wants to remain profitable and competitive.

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This may look quite daunting, but it is only what successful professional marketeers and engineers already know to do, so as not to expose their company to excessive commercial and/or legal risks.Īs electronic technology becomes more advanced, more advanced management and design techniques (such as EMC) are required. Investigate all complaints of interference problemsįeed any resulting improvements to design back into existing designs and new products (a corrective action loop).To add new markets go through the initial electromagnetic specification stage again. Sell only into the markets originally designed for.

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Employ EMC techniques in QA to control:Īll changes in assembly, including wiring routes and component substitutions All electrical/electronic/mechanical design modifications and software bug-fixes All variants.Achieve regulatory compliance for all target markets.Employ best-practice EMC techniques in software design.Simulate EMC of designs prior to creating hardware, perform simple EMC tests on early prototypes, more standardised EMC tests on first production issue. Safety compliance is covered by safety directives, not by EMC Directive Īll the EMC standards to be met, regulatory compliance documentation to be created, and how much “due diligence” to apply in each case (consider all markets, any customers’ inhouse specifications, etc.).Įmploy system-level best-practices (“bottom-up”) įlow the “top-level” EMC specifications down into the various system blocks (“top-down”).Įmploy electrical/electronic hardware design best-practices (“bottom-up”) (covered by these six articles) Whether there are any safety issues requiring additional electromagnetic performance specifications. Its possible proximity to sensitive apparatus and allowable consequences, hence the emissions specifications The electromagnetic environment it must withstand (including continuous, high-probability, and low-probability disturbance events) and the degradation in performance to be allowed during disturbance events Establishment of the target electromagnetic specifications for the new product, including:.The EMC issues in a new project lifecycle are summarised below: The techniques covered in these six articles are:ġ) Circuit design (digital, analogue, switch-mode, communications), and choosing componentsĥ) PCB layout (including transmission lines)Ħ) ESD, electromechanical devices, and power factor correctionĪ textbook could be written about any one of the above topics (and many have), so this magazine article format can do no more than introduce the various issues and point to the most important of the best-practice techniques.īefore starting on the above list of topics it is useful see them in the context of the ideal EMC lifecycle of a new product design and development project.

I am also indebted to Tom Sato for translating these articles into Japanese and posting them on his website:, as well as suggesting a number of improvements. This version includes a number of corrections, modifications, and additions, many of which have been made as a result of correspondence with the following, to whom I am very grateful: Feng Chen, Kevin Ellis, Neil Helsby, Mike Langrish, Tom Liszka, Alan Keenan, T Sato, and John Woodgate.

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These articles were first published in the EMC Journal as a series during 1999. The series is intended for the designer of electronic products, from building block units such as power supplies, single-board computers, and “industrial components” such as motor drives, through to stand-alone or networked products such computers, audio/video/TV, instruments, etc. This is the first in a series of six articles on best-practice EMC techniques in electrical/electronic/mechanical hardware design, to be published in this journal over the following year. Partner, Cherry Clough Consultants, Associate of EMC-UK By Eur Ing Keith Armstrong CEng MIEE MIEEE

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