Re: [PSES] Production Assurance Tests for EMC

Thu, 11 Jul 2013 10:30:46 -0700

Hi Luke,

There is certainly no one size fits all solution.  There are many factors to consider, complexity of the product, internal quality controls, how long the product is in production, and supply chain management just to name a few.  I would imagine that a company that had very tight controls on design changes, production quality, and their supply chain could justify minimal testing. This might even be no testing for a simple product that passed with generous margins, no design changes, and has very tight controls over the entire cradle to grave product life cycle.
 
On the extreme opposite end, If you are building your product at a CM and you allow them to buy parts from whoever they like, you are constantly making design changes, and even if the product is not complex, then maybe you should be testing every batch, especially if you had no margin on the original testing! 
 
-- 
Dan Roman, N.C.E.
VP Communications Services
IEEE Product Safety Engineering Society
 
On 07/11/13, Luke Turnbull<[email protected]> wrote:
 

Dear Group,

 

I have familiarity with how the aerospace and automotive industries deal with testing and manufacture of systems, but am less familiar with products tested to commercial standards.

 

What is the custom and practice for demonstrating continued compliance to EMC requirements for products that are in production for a long time?  I assume that over time, the construction of e.g. capacitors may change – leading to different stray characteristics, even for the same manufacturer and component value; and that IC’s may be functionally similar, but again have a different internal construction.  Do system suppliers generally re-test for EMC when components become obsolescent?  Do system suppliers generally re-test periodically in case components have been unknowingly changed, or in case production processes have been changed without considering their effect on EMC compliance?

 

Thanks for your help.

 

 

Dr Luke Turnbull
EMC Technical Manager
TRW Conekt
Stratford Road
Solihull
West Midlands B90 4GW

United Kingdom

Tel:        +44 (0)121.627.3966

email:  [email protected]
web:     www.conekt.co.uk

 

 

 

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