Mike Sherman’s view exactly mirrors my experience in the 25 years I’ve been doing EMC testing!
Regards, Ian McBurney Lead Compliance Engineer Allen & Heath Ltd. Kernick Industrial estate, Penryn, Cornwall. TR10 9LU. UK. Tel: 01326 372070 Email: [email protected] From: MIKE SHERMAN <[email protected]> Sent: 24 May 2021 21:29 To: [email protected] Subject: Re: [PSES] What percentage of products pass first time? We have found "pre-screening" EMC testing early in the development cycle to be a good investment. EMC test results can be notoriously hard to predict, even when using EMC-savvy design principles. Extra PCB board spins are cheap in the context of a larger or time critical project. Mike Sherman Graco Inc. On 05/24/2021 2:58 PM John E Allen <[email protected]<mailto:[email protected]>> wrote: “From much experience” I can only concur with Pete, Monrad and yourself – safety, EMC & RoHS compliance must be explicitly built into the Product Lifecycle structure and process. Failure to do that, and to then make sure that that all WORKS is a route to “painful”, time-consuming and expensive results (“been there and seen that” – and recounted that here - far too many times!). ☹ John E Allen W.London, UK From: Richard Nute <[email protected]<mailto:[email protected]>> Sent: 24 May 2021 19:45 To: [email protected]<mailto:[email protected]> Subject: Re: [PSES] What percentage of products pass first time? Hi Charles: Not what you asked for, but a set of principles for success with third-party testing, from a product safety point of view: 1. The design engineer and the product safety engineer should be able to predict the outcome of any test. 2. Testing simply confirms (or not) the prediction. 3. Failure of a test or other requirement at the third-party delays the third-party investigation which can imperil the product schedule. To maintain schedule, the product must comply with all tests before it is submitted to the third-party. 4. If the product that you successfully tested fails a third-party test, then your or the third-party test was in error. This can open a dialogue between you and the third-party as to test process. 5. Tests to standards requirements are either pass or fail; always record the measurement. If the test requires a stimulation, then adjust the stimulation to the point of failure and record the measurement. Both tell you the margin between pass and failure. 6. Provide your measurement data to the third-party when you submit the product. If the third-party measurement data differs from your data, some third-parties will do their own investigation as to why. In my opinion, EMC is not a black art and can follow these same principles. Stay safe, and best regards, Rich From: Grasso, Charles [Outlook] <[email protected]<mailto:[email protected]>> Sent: Monday, May 24, 2021 7:47 AM To: [email protected]<mailto:[email protected]> Subject: [PSES] What percentage of products pass first time? 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