Non sequitur. Remains an internal company policy issue, driven by engineering rationale. Rational players account for statistically reasonable variance. Others do not care, or have chosen to assume a certain risk level.
Brian Sr Taco Advisor To the Klingon Imperial Chef -----Original Message----- From: Pearson, John [mailto:[email protected]] Sent: Tuesday, October 13, 2015 10:34 AM To: [email protected] Subject: Re: [PSES] SV: [PSES] Stricter limits than legal (CISPR11, IEC, etc,) Where? Hello If you are selling into the EU your DoC declaring to the harmonized std (assuming you are taking this route) states that you are confirming that each and every item of product placed upon the market is compliant to the limit and not just the test sample. Does that not mean you will either have to test every item prior to shipment and sale, or apply some level of margin to feel comfortable in making this declaration? Of course testing every item is the total solution but is likely cost prohibitive unless you sell very high value items in single figures a year. Even if the stds makers have applied margin in writing the spec the DoC process does not recognize this and requires the above. -----Original Message----- From: Brian O'Connell [mailto:[email protected]] Sent: 13 October 2015 18:22 To: [email protected] Subject: Re: [PSES] SV: [PSES] Stricter limits than legal (CISPR11, IEC, etc,) Where? Bingo. Safety and EMC standards have 'built-in' margins per committee members that cared to converse with this plebian. A supplier's margin is in internal policy, or is per your customer's spec, or is per empirical numbers from the end-use installation. Measurement Uncertainty is not necessarily a 'margin', but does have statistical relevance. Control of manufacturing process and product construction cannot be reasonably specified in EMC standards, unless you want to write EMC standards to the content and format of safety standards. Have fun with that. Indeed, per Mr. Crane, why assume anything? Brian Sr Burrito and Ale Test Engineer -----Original Message----- From: Crane, Lauren [mailto:[email protected]] Sent: Tuesday, October 13, 2015 9:44 AM To: [email protected] Subject: Re: [PSES] SV: [PSES] Stricter limits than legal (CISPR11, IEC, etc,) Where? All the issues being raised regarding possible variability must be known to the members of various standards committees. Does anyone know that the issues are *not* taken into account when the committees set test levels? If standards are followed, including any instructions regarding EUT sampling and measurement uncertainty, why assume additional margins must be applied? Regards, Lauren Crane KLA-Tencor - ---------------------------------------------------------------- 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]>
