This is sort of off topic -- but it's on topic too. Some years ago, at a now defunct computer manufacturer, customer complaints of memory incompatibility lead us to purchase test equipment specifically designed to evaluate memory cards. What we found was that, although different vendors cards used the same chips, due to layout problems many of them were incapable of achieving their rated speeds. This should of course have been no surprise. However, it cost us money!
It's reasonable to think that a memory which is on already on the edge of returning faults will be more susceptible -- and make the product more susceptible -- to ESD and EFT induced problems. Depending on corporate priorities, one might aim for a a robust product design to work with anything a customer might stuff in it -- or specify WHICH manufacturers memories will be covered by the device warranty. That's cheaper up front, and the way things are done. I will note that the marketing rationale for placing a CE mark on components which may be installed by the public could well extend even to resistors. I await the CE-marked, LVD and EMCD tested, zero volt, zero ohm chip resistor. Brussels is the necessity of invention. Ad astra per aspirin. Cortland Doug Massey posted >> I still think that a sound, defensible engineering rationale can be made to support the case that a memory stick does little to affect the immunity characteristics of a desktop PC. I reluctantly agree that it could POSSIBLY (not likely) affect the unintentional emissions of a desktop PC. I strongly agree that there are marketing and customer confidence advantages to placing the CE Mark on such a device, even if the requirements are somewhat unclear, and may have some 'wiggle room' there. I totally agree that the most conservative course here is to apply the EMCD in full. (did I encompass everybody's posts here?). And as always, if in doubt, TEST!! << This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: emc-p...@hypercom.com Dave Heald: emc_p...@symbol.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
