> From: John Woodgate > Sent: Wednesday, July 11, 2007 9:19 AM > > Tarver, Peter" writes: > > >Does this idea intend that each product off the production line be > >marked or otherwise documented with it's IR value? > > No. In the manual you state a lower limit value based on the > '1/3 of original'. The original value should not vary much > between samples, of course; If it does, there's cause for > concern right away.
This is not as simple as you put it. This ignores the processes of engineering changes and reviews and that manuals have to be at the printer for bulk printing (or bulk copying onto CD ROM) well before the first product comes off the assembly line. Also, with the pace of product churn, a desire to keep cost competitive and avoid single-source supplier issues, multiple vendor parts selection is very common, but does not always occur at the time of first customer shipment. Updating a manual for every alternate power supply that's added or substituted is also more costly than justifiable by this suggestion. > >I think it's best to set a lower acceptable limit of IR. > Keeping track > >of the documentation for every product in-house is, at best, > >impractical, for any but the smallest enterprise. > > Not really; the test boxes have in-built data storage and > transmission. > It's quite easy, and not costly, to keep the records for the > working life of each product. There may be some test equipment with the functions you mention and perhaps those persons trotting about on official government errands to perform this in-situ testing have the budget for them. In such cases, the government can address record keeping, if that's what's desired. They can then compare previous test data on the same product at their leisure. Your tax £ at work. I think you underestimate the cost and ease of maintaining such a database for anything other than a small shop, who are unlikely to own the test equipment. The test equipment I have in-house for type testing is at least 30 years old and not likely to be replaced. It's data storage function is at the end of my arm. Regards, Peter L. Tarver, PE ptar...@ieee.org CONFIDENTIALITY This e-mail message and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail message, you are hereby notified that any dissemination, distribution or copying of this e-mail message, and any attachments thereto, is strictly prohibited. If you have received this e-mail message in error, please immediately notify the sender and permanently delete the original and any copies of this email and any prints thereof. ABSENT AN EXPRESS STATEMENT TO THE CONTRARY HEREINABOVE, THIS E-MAIL IS NOT INTENDED AS A SUBSTITUTE FOR A WRITING. Notwithstanding the Uniform Electronic Transactions Act or the applicability of any other law of similar substance and effect, absent an express statement to the contrary hereinabove, this e-mail message its contents, and any attachments hereto are not intended to represent an offer or acceptance to enter into a contract and are not otherwise intended to bind the sender, Sanmina-SCI Corporation (or any of its subsidiaries), or any other person or entity. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to emc-p...@ieee.org Instructions: http://listserv.ieee.org/request/user-guide.html List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas emcp...@ptcnh.net Mike Cantwell mcantw...@ieee.org For policy questions, send mail to: Jim Bacher: j.bac...@ieee.org David Heald: emc-p...@daveheald.com All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
