As a matter of policy my company tests DC ports to the appropriate levels on all products where we do not supply the external DC Power Supply. As we cannot guarantee the quality of the DC power supply the customer will use or the installation, we assume the worst. In this instance you would be relying on a DC supply you know nothing about to protect your product from transients. It's simply a matter of "Do you want to be known as a supplier of products that work ALL THE TIME - or SOME of the time.
Occasionally you have to remind the marketing department of the cost of poor quality. While it may cost a dollar or two to add appropriate protection, the cost of no protection is much higher in the long run. Warranty costs can eat a company alive not to mention the reputation one could acquire for quality problems. In my opinion, it's not worth the risk to not test & fix, where appropriate. Just one guy's opinion. Regards, Michael Taylor Colorado -----Original Message----- From: KC CHAN [PDD] [mailto:kcc...@hkpc.org] Sent: Monday, December 17, 2001 6:49 PM To: jb...@bb-elec.com; emc-p...@majordomo.ieee.org Subject: Re: surges on 24VAC I am thinking if it is possible to connect the source input to the surge tester to a DC source, instead of the AC source, then you can apply the surge tests to the DC input of your product. >>> "Jennifer Banh" <jb...@bb-elec.com> 12/18/01 03:43am >>> Hello everyone, I am currently trying to test a product of ours that falls under 50082-1 generic standard for light industrial equipment. Our problem is that we have a 24VAC power input port. The generic standard calls out for EN 61000-4-5 on AC power input ports. After looking at EN 61000-4-5 it seems that it is intended for AC mains voltages, but I couldn't find anything that says a 24VAC input is exempt from this test. I am looking for outside opinions on whether this test is truly applicable. Thanks, Jennifer Banh BTW, we already tried just testing to the spec, and failed. Any suggestions on how to protect against this test would also be appreciated. ------------------------------------------- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. ------------------------------------------- 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: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
