Brian, I have forwarded your message to the sales director and production manager. They, and others, oft accuse me of intransigent (but typically use many additional descriptive terms). We all make mistakes, but they must be recoverable and not fatal.
Component power supplies - you get what you pay for, but the price/performance ratio is getting better. We have frequent requests for small runs of custom power converters at a China million-piece off-the-shelf price. Good stuff. Thanks for the ammo. Brian -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of Kunde, Brian Sent: Monday, June 18, 2012 8:40 AM To: [email protected] Subject: RE: CISPR 11 Question If your company makes a device or component that is used within your customer's device or system I highly recommend you design and test your product for the best EMC performance you can within reason. Our company purchases many components, modules, power supplies, controllers, etc. from other companies which become part of our products or systems. In the world of Laboratory Equipment, because of the much smaller quantities produced, this approach is more common than say consumer products. Our EMC lab pre-tests almost everything and as a general rule we fail about 50% of what we test for either emissions or one of the many immunity tests we run. Our company just doesn't have the time to fix other people's problems so IF we have a choice we will purchase the products with the best EMC performance. If we do not have a choice we will try to fix the problem. Because we are a fairly small company and don't have a lot of buying power and rarely can get the manufacturer to make changes or improvements for us. We try to be helpful and pass on our failing results to manufacturers. We have had several cases where the manufacturers will deny our findings only to return a year or so later confessing we were right and promise they have fixed their problems and now want to sell to us. Once a company gets a bad reputation we will rarely do business with them. I know this reply is not based on what the law, directives, or standards say, but based on a business perspective from one company's point of view. Hope this is helpful. The Other Brian From: [email protected] [mailto:[email protected]] On Behalf Of Chris Wells Sent: Saturday, June 16, 2012 8:44 PM To: 'Bob Richards'; [email protected] Subject: RE: CISPR 11 Question Bob Yes I should have tried that approach. Thanks for pointing it out. I do have another opportunity in a few months. Chris Wells From: [email protected] [mailto:[email protected]] On Behalf Of Bob Richards Sent: Saturday, June 16, 2012 3:45 PM To: [email protected] Subject: RE: CISPR 11 Question I've had clients request testing the DC input just as we would for AC. It would seem to me that if you test the DC input and it passes, then there should be little question about compliance. Bob R. --- On Sat, 6/16/12, Chris Wells <[email protected]> wrote: From: Chris Wells <[email protected]> Subject: RE: CISPR 11 Question To: [email protected] Date: Saturday, June 16, 2012, 7:58 AM I am facing a similar issue: I have a 24VDC powered device that needs to meet CISPR 11. We planned to recommend a particular class B power supply with this device. However the noise from our device appears to be pushing through the power supply and limiting the combo to class A. The problem area is in the 5-30 MHz. range. So now I need to resolve if the power supply by itself is the issue or if our device is the culprit. Radiated wise I can achieve class B with this combo. Chris Wells Eaton Corp - ---------------------------------------------------------------- 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://listserv.ieee.org/request/user-guide.html 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]>
