We have a Lindgren FACT10 (used to be called a FACT5) 10 meter semi-anechoic chamber built 11 years ago. Recently we have been seen sporadic spike emissions that interferes with our peak scans. We have narrowed the problem down to the chamber lights, which are 8 metal halide 400 watt lamps.
We have replaced all the bulbs and the ballast but the problem is still there. We have replaced the line filters used on the light circuit; also no change. It is a real difficult problem to troubleshoot because the emissions are so sporadic. We started disconnecting the lights one by one. With fewer lights the problem seems to diminished, but it is like all the light generate this noise from time to time. Other than the startup noise from these metal halide lamps, I thought they are suppose to be very quite and not generate such EMI noise. I was hoping some of you chamber owners out there may have some insight into our problem. We are running out of ideas here. Could we have obtained bad or cheep bulbs? Is there a manufacturer of replacement bulbs that are better? Is there a newer light technology that is better than the 11 year old metal halide lamps? Any and all suggestions are welcome and appreciated. We are stratching our heads bloody trying to figure this out. Thank you all, The Other Brian LECO Corporation Notice: This communication may contain confidential information intended for the named recipient(s) only. If you received this by mistake, please destroy it and notify us of the error. Thank you. - This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/ To post a message to the list, send your e-mail to [email protected] 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] All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please visit http://www.messagelabs.com/email ______________________________________________________________________
