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]> 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]> > Sent: 24 May 2021 19:45 > To: [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? > > > > Hello EMC gurus! > > > > Calling all labs - In your experience how many products pass the > Unintentional Emissions > test first time? > > > > > > - > ---------------------------------------------------------------- > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <[email protected] mailto:[email protected] > > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site > at http://product-compliance.oc.ieee.org/ can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) http://www.ieee-pses.org/list.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected] mailto:[email protected] > > Mike Cantwell <[email protected] mailto:[email protected] > > > For policy questions, send mail to: > Jim Bacher <[email protected] mailto:[email protected] > > David Heald <[email protected] mailto:[email protected] > > > - > ---------------------------------------------------------------- > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <[email protected] mailto:[email protected] > > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site > at http://product-compliance.oc.ieee.org/ can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) http://www.ieee-pses.org/list.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected] mailto:[email protected] > > Mike Cantwell <[email protected] mailto:[email protected] > > > For policy questions, send mail to: > Jim Bacher <[email protected] mailto:[email protected] > > David Heald <[email protected] mailto:[email protected] > > > - > ---------------------------------------------------------------- > > This message is from the IEEE Product Safety Engineering Society emc-pstc > discussion list. To post a message to the list, send your e-mail to > <[email protected] mailto:[email protected] > > > All emc-pstc postings are archived and searchable on the web at: > http://www.ieee-pses.org/emc-pstc.html > > Attachments are not permitted but the IEEE PSES Online Communities site > at http://product-compliance.oc.ieee.org/ can be used for graphics (in > well-used formats), large files, etc. > > Website: http://www.ieee-pses.org/ > Instructions: http://www.ieee-pses.org/list.html (including how to > unsubscribe) http://www.ieee-pses.org/list.html > List rules: http://www.ieee-pses.org/listrules.html > > For help, send mail to the list administrators: > Scott Douglas <[email protected] mailto:[email protected] > > Mike Cantwell <[email protected] mailto:[email protected] > > > For policy questions, send mail to: > Jim Bacher <[email protected] mailto:[email protected] > > David Heald <[email protected] mailto:[email protected] > > - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
