Actually, I don't even know if you need to read a standard for this one...just think about it for a second and apply some common sense.
So the power supply has passed EFT and Surge. That's great. What was the criteria for susceptability? Many standards allow Criterion B performance (upset during the test with self recovery after). So, if they tested to Criterion B performance, the power supply could put out 0 Volts during a Surge and then self recover after the Surge. When the power supply manufacturer performed their testing, did they test to performance Criterion A (performance within specified limits). If so, did they actually put an oscilloscope on thier output and measure how much of the Surge or EFT passes through as ripple? If not, then how can you predict how a product using this power supply will react? Using a compliant supply is a great first step toward compliance. However, it probably doesn't preclude from system testing unless the power supply manufacturer completely characterized their outputs during their testing. For example, if their test data states that they passed Surge and EFT while only passing on 30mV of ripple and no transients; and if you know that your inputs can withstand 30mV of ripple and no transients; then you could claim "due diligence" and not test. If the power supply manufacturer didn't test to Criterion A with detailed record keeping; then how could you trust the overall system without testing? Chris Maxwell | Design Engineer - Optical Division email [email protected] | dir +1 315 266 5128 | fax +1 315 797 8024 NetTest | 6 Rhoads Drive, Utica, NY 13502 | USA web www.nettest.com | tel +1 315 797 4449 | > -----Original Message----- > From: [email protected] [SMTP:[email protected]] > Sent: Friday, October 11, 2002 3:49 AM > To: [email protected] > Subject: Re: requirement for surge and EFT > > > I do not have a copy of EN55024. > But from IEC 61000-6-1:1997 " Electromagnetic compatibility (EMC)> -> Part > 6-1: > Generic standards > -> Immunity for residential, > commercial and light-industrial environments", page 23 - Immunity DC input > /output power ports- Note 4 Burst / Surge, I quote: > "Not applicable to input ports intended for connection to a battery or a > rechargeable battery which must be removed or disconnected from the > apparatus for recharging. Apparatus with DC power input port intended for > use with an AC/DC power adaptor shall be tested on the AC power input of the > AC/DC power adaptor specified by the manufacturer or, where none is so > specified, using a typical AD/DC adaptor. The test is applicable to DC power > input ports intended to be connected permanently to cables longer than 10m". > > So, the complete system shall be burst & surge tested according to IEC > 61000-6-1:1997. > > Amund > > > > -----Opprinnelig melding----- > > Fra: [email protected] > > [mailto:[email protected]]På vegne av George Stults > > Sendt: 10. oktober 2002 22:13 > > Til: '[email protected]' > > Emne: requirement for surge and EFT > > > > > > > > Hello Group, > > > > I am talking with an offshore manufacturer who is suggesting that their CE > > marked ITE gear does not have to pass Surge and EFT since it runs > > off 12Vdc, > > normally provided by an AC/DC power supply, which is supplied in the same > > package. They suggest that the AC/DC power supply, but not the > > ITE, has to > > pass Surge, etc. I'm sure that the whole system has to pass, but I don't > > know chapter and verse to quote. I suppose the scope should be > > spelled out > > in EN55024 but I don't have a copy of it, yet. > > > > Thanks in advance. > > > > George Stults > > > > ------------------------------------------- > > 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: > > [email protected] > > with the single line: > > unsubscribe emc-pstc > > > > For help, send mail to the list administrators: > > Ron Pickard: [email protected] > > Dave Heald: [email protected] > > > > For policy questions, send mail to: > > Richard Nute: [email protected] > > Jim Bacher: [email protected] > > > > All emc-pstc postings are archived and searchable on the web at: > > http://ieeepstc.mindcruiser.com/ > > Click on "browse" and then "emc-pstc mailing list" > > > > ------------------------------------------- > 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: > [email protected] > with the single line: > unsubscribe emc-pstc > > For help, send mail to the list administrators: > Ron Pickard: [email protected] > Dave Heald: [email protected] > > For policy questions, send mail to: > Richard Nute: [email protected] > Jim Bacher: [email protected] > > All emc-pstc postings are archived and searchable on the web at: > http://ieeepstc.mindcruiser.com/ > Click on "browse" and then "emc-pstc mailing list" ------------------------------------------- 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: [email protected] with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Ron Pickard: [email protected] Dave Heald: [email protected] For policy questions, send mail to: Richard Nute: [email protected] Jim Bacher: [email protected] All emc-pstc postings are archived and searchable on the web at: http://ieeepstc.mindcruiser.com/ Click on "browse" and then "emc-pstc mailing list"
