On Wed, 5 Dec 2018 10:10:22 +0000, Andre Gomes Videira <[email protected]> wrote:
> 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? FYI, IEC 61000-4-5:2014 Annex H (informative), "Coupling/decoupling surges to lines rated above 200 A", suggests an alternative method which use a long supply cable as the decoupling network. Regards, Tom -- Tomonori Sato <[email protected]> URL: http://t-sato.in.coocan.jp - ---------------------------------------------------------------- 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]>
