Hi Jim, A guideline I use for Criteria B is that the E.U.T may exhibit degradation due to the field disturbance, but must self-recover after the field disturbance is removed. What I have seen is that in certain power supplies the secondary output voltage drops due to the surge, causing telco systems to re-set. If you have to manually turn the system back on your dealing with Criteria C. Hope this helps! Eddie O'Toole -----Original Message----- From: Jim Hulbert [mailto:hulbe...@pb.com] Sent: Wednesday, January 12, 2000 3:08 PM To: emc-p...@ieee.org 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).