Andre, The standard 61000-4-5: 2006 says that decoupling networks are required to provide sufficient decoupling impedance to the surge wave so that the specified wave may be applied on the lines under test. With this alternative test method, I don't think you can say that you are decoupling the surge wave from the ac mains as intended by the standard.
I think you have legitimate doubts on the alternative method. The alternative method certainly applies a surge to the product, but I think you would have a difficult time arguing that you have tested according to the standard. There are CDNs on the market. My lab has a 100A CDN. Jim ____________________ James L. Knighten, Ph.D. [cid:[email protected]] 17095 Via Del Campo San Diego, CA 92127 858-485-2537 From: Andre Gomes Videira <[email protected]> Sent: Wednesday, December 05, 2018 2:10 AM To: [email protected] Subject: [PSES] Alternative coupling for Surge Test - Higher current products [External Email] ________________________________ Dear all, We have some products with a current higher than the Surge test CDN from many labs in our region can withstand. So, we found a lab that does an alternate Surge test. Instead of connecting the product to the CDN, they connect it directly to the power supply. In the output of the CDN, in each phase, a 10uF capacitor is placed, and it goes directly to the product power supply. This way, the current does not go through the CDN, and the Surge noise couples directly to the product. We have some doubts on this method, since: 1. It changes the output CDN surge impedance, what can lead to some changes in the noise waveform 2. Since I am coupling directly to the supply, the noise voltage could be divided by going to the product and to the supply in parallel What are your thoughts on this? Is this a valid test method? Thank you all. Best regards, André Gomes Videira Laboratório de Ensaios e Certificações Telefone: + 55 47 3276-7613 | Skype: agvideira WEG Drives & Controls - Automação Ltda. www.weg.net Clique aqui <http://disclaimer.weg.net/> caso você não seja o destinatário deste email, ou desejar conhecer nossa política de privacidade. Click here <http://disclaimer.weg.net/> if you are not the intended recipient, or in case you want to know our privacy policy. - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]<mailto:[email protected]>> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe)<http://www.ieee-pses.org/list.html> List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]<mailto:[email protected]>> Mike Cantwell <[email protected]<mailto:[email protected]>> For policy questions, send mail to: Jim Bacher <[email protected]<mailto:[email protected]>> David Heald <[email protected]<mailto:[email protected]>> - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. To post a message to the list, send your e-mail to <[email protected]> All emc-pstc postings are archived and searchable on the web at: http://www.ieee-pses.org/emc-pstc.html Attachments are not permitted but the IEEE PSES Online Communities site at http://product-compliance.oc.ieee.org/ can be used for graphics (in well-used formats), large files, etc. Website: http://www.ieee-pses.org/ Instructions: http://www.ieee-pses.org/list.html (including how to unsubscribe) List rules: http://www.ieee-pses.org/listrules.html For help, send mail to the list administrators: Scott Douglas <[email protected]> Mike Cantwell <[email protected]> For policy questions, send mail to: Jim Bacher: <[email protected]> David Heald: <[email protected]>
