Hello All, My take on establishing whether a temporary shut down (loss of function) is acceptable is by knowing your customers' or potential customers' requirements, expectations, or at least tolerances. The trick is getting this information. It can be asked directly to customers, covered in requirement specifications from product groups who researched those issues, or may be inferred from specific product standards that are similar to or directly apply to your type of product. Many product standards have immunity requirements that give specific minimum performance criterion. Applying those criterion from similar product standards to your product can indirectly cover expectations of your customer. As for criterion B, I would say no, shut down for ten minutes and then recoverable is criterion C. Hope this helps.
Regards, Robert Tims Compliance Engineer Ericsson Messaging Systems Inc. > -----Original Message----- > From: rehel...@mmm.com [SMTP:rehel...@mmm.com] > Sent: Thursday, January 13, 2000 7:54 AM > To: emc-p...@majordomo.ieee.org > Subject: Re: Surge Test Performance Criterion > > > > > I agree with Carlos. > > The standard says, "This clause gives you a guide for evaluation of the > test results........". > It also says, "The variety and diversity of equipment and systems to be > tested makes the task of establishing the effects of surges on equipment > and systems difficult". > It also says, "The test results shall be classified on the basis of the > operating conditions and the functional specifications of the equipment > under test..........". > > The standards committees are smart enough to know that they cannot > possibly > write descriptions of test evaluations that would cover every conceivable > piece of equipment ever designed in the past or ever to be designed in the > future, so they provided "guidelines for evaluation". If product > specifications provide different operating conditions and functional > specifications than are provided in the guidelines then testing is > evaluated to the product specifications. > > ======================================================== > > > > > > > carlos.perk...@eu.effem.com on 01/13/2000 01:15:25 AM > > Please respond to carlos.perk...@eu.effem.com > > > To: "Jim Hulbert" <hulbe...@pb.com> > cc: emc-p...@ieee.org (bcc: Robert E. Heller/US-Corporate/3M/US) > Subject: Re: Surge Test Performance Criterion > > > > > > Jim, > > I agree with you, on the basis that in this case, a complete shut-down is > a > designed-in function of the product, and the standard says "No degradation > of > performance or loss of function is allowed below a performance level > specified > by the manfucturer". You, as the manufacturer, are specifying this 'loss > of > function'. > > In my mind, all you have to do is make the end user aware that a shut-down > will > occur when a surge is detected, and you should be OK. > > Cheers, > > Carlos. > > > > > > Please respond to "Jim Hulbert" <hulbe...@pb.com> > > > To: emc-p...@ieee.org > cc: (bcc: Carlos A. Perkins/WIN/Effem) > From: "Jim Hulbert" <hulbe...@pb.com> on 12/01/2000 20:08 > > Subject: Surge Test Performance Criterion > > > > > > > > > A product has a switched mode power supply with a current sensing circuit > that > causes the supply to shut down when a surge pulse is applied to the AC > mains in > accordance with EN61000-4-5/IEC1000-4-5. After about 10 minutes, the > supply can > be turned back on and normal operation of the product can be resumed by > the > operator. Does this product conform to criterion B of the EN 50082-1 or > EN > 55024 standards? I believe it does because the sensing circuit is > specifically > designed to protect the product against this kind of voltage/current surge > and > the product operation is fully recoverable by the operator afterward. > However, > I would like to hear how others who do this testing would interpret this. > > Jim Hulbert > Senior Engineer - EMC > Pitney Bowes > > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to majord...@ieee.org > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to ed.pr...@cubic.com, > jim_bac...@monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). > > > > > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to majord...@ieee.org > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to ed.pr...@cubic.com, > jim_bac...@monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). > > > > > > > > > > --------- > This message is coming from the emc-pstc discussion list. > To cancel your subscription, send mail to majord...@ieee.org > with the single line: "unsubscribe emc-pstc" (without the > quotes). For help, send mail to ed.pr...@cubic.com, > jim_bac...@monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). > > --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
