It wasn't done derek because there is no requirement that is mandatory. My humble opinion says voluntary standards don't work as well as they should.. Sometimes it requires a resistor to limit the current going to the switch as it obviously rectifies some of the RF. In some cases a bypass capacitor is required also. on the hot lead to ground.
Ralph ----- Original Message ----- From: "Derek Walton" <[email protected]> To: "Ralph Cameron" <[email protected]> Cc: <[email protected]>; "Jim Hulbert" <[email protected]>; <[email protected]> Sent: Thursday, January 13, 2000 3:12 PM Subject: Re: Surge Test Performance Criterion > Ralph, > > if all it takes is a resistor, I wonder why it wasn't done.... 99% of the > population are stuck with a crap product.... The idea with CE was that this > shouldn't happen! > > Derek. > > Ralph Cameron wrote: > > > Derek: > > > > You want to locate one of those lights next to a transmitter that is used > > intermittently - the light sequences through LO-Medium-high then turns off > > only to come back on again when the transmitter is keyed. > > > > The AC switching device lacks immunity to RF but it may be easily cured with > > the addition of a single resistor. > > > > Ralph Cameron > > > > EMC Consultant and Suppression of Consumer Electronic Equipment. > > (After sale) > > > > ----- Original Message ----- > > From: "Derek Walton" <[email protected]> > > To: <[email protected]> > > Cc: "Jim Hulbert" <[email protected]>; <[email protected]> > > Sent: Thursday, January 13, 2000 8:57 AM > > Subject: Re: Surge Test Performance Criterion > > > > > > > > Sorry Carlos, > > > > > > I can't go along with this one. If I'm using my PC here in the USA midwest > > and a > > > storm comes along I don't want my PC shutting itself off every few > > minutes.... Only > > > been hit directly with two lightning strikes this last 2 years, but during > > a storm > > > you can continuously heat squeaking as the modem is hit, I know the power > > is seeing > > > voltage surges too. I'll have to put a Dranitz on the power just to see > > what kinds > > > of voltage surges arrive.... The same applies to surges generated by > > motors etc. If > > > every time a motor switches on and my equipment does something, well that > > would have > > > to go back to the store. > > > > > > By the way, I don't expect to find in the small print all sorts of get out > > clauses > > > once I buy something.... > > > > > > A controlled shut down is there to prevent loss of life, destruction of > > the device, > > > or something as equally bad..... > > > > > > By the way, I was back home ( Manchester, England ) last October and > > bought my Mum a > > > light that turns on when you touch any metal part of it, it was CE marked. > > I have a > > > similar light here in the USA, mine's not CE marked. BOTH turn on/off when > > there are > > > voltage transients on the power line. Now you can wrangle all you want, > > but being > > > woken up in the middle of the night because the light turned on when the > > dishwasher > > > began it's Saver Seven ( low cost overnight electricity ) cycle, is not > > acceptable > > > performance! If then manufacturer calls this acceptable performance, then > > perhaps I > > > should call him/her in the middle of the night each time to confirm that > > > opinion...;-) > > > > > > What products do you make again;-))) > > > > > > Derek. > > > > > > > > > During surge > > > > > > [email protected] wrote: > > > > > > > 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" <[email protected]> > > > > > > > > To: [email protected] > > > > cc: (bcc: Carlos A. Perkins/WIN/Effem) > > > > From: "Jim Hulbert" <[email protected]> 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 [email protected] > > > > with the single line: "unsubscribe emc-pstc" (without the > > > > quotes). For help, send mail to [email protected], > > > > [email protected], [email protected], or > > > > [email protected] (the list administrators). > > > > > > > > --------- > > > > This message is coming from the emc-pstc discussion list. > > > > To cancel your subscription, send mail to [email protected] > > > > with the single line: "unsubscribe emc-pstc" (without the > > > > quotes). For help, send mail to [email protected], > > > > [email protected], [email protected], or > > > > [email protected] (the list administrators). > > > > > > > > > --------- > > > This message is coming from the emc-pstc discussion list. > > > To cancel your subscription, send mail to [email protected] > > > with the single line: "unsubscribe emc-pstc" (without the > > > quotes). For help, send mail to [email protected], > > > [email protected], [email protected], or > > > [email protected] (the list administrators). > > > > > > > > > > > --------- This message is coming from the emc-pstc discussion list. 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