Muriel, What is the size of the equipment the power supplies will fit into? Can this be tested within you GTEM cell?
I would prefer to put cables and load into the GTEM cell. I am using a GTEM cell for quite a while for pre-compliance testing and made good experiences. There are - as already pointed out - some things to take care of: - Cables connected to the EUT exiting the GTEM cell and other cables with in the cell have a great influence on the result from their positioning within the GTEM cell and their filtering when going outside. - To get an impression of the relevance of your testing choose an EUT that fits completely in your GTEM cell and conduct a comparative measurement on an OATS. - If you are doubting a result repaeat the test - I do not know what parameters you are using for a prescan - there are peaks which might occur due to a single event when you do a peak measurement and others might not be there. The measurement time has a great influence on the recording of short time events (yawn, I know, but I stress this point as I forget it often myself :-| ) But - before you put it in - what is the maximum thermal load for an EUT within your GTEM cell? Please excuse if I touched points that you already considered. For a better testing repeatability of EUTs with many cables within GTEM cells there are manipulator arms with cable guides. Schaffner is one of the manufacturers of such things. Best regards, Michael Nagel > -----Original Message----- > From: Muriel Bittencourt de Liz [mailto:mur...@eel.ufsc.br] > Sent: Donnerstag, 20. Februar 2003 19:52 > To: EMC-PSTC List > Subject: About Radiated Measurements > > > > Group, > > I have a doubt concerning radiated emissions measurement: > > - For radiated emissions measurement of switched mode power > supplies using a > TEM cell, should I leave the loads of the supply inside or outside the > cell?? My TEM cell have filtered connections for DC loads. > > Thanks in advance for your help. > > Best Regards, > > Muriel > > > > > ------------------------------------------- > 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: > Ron Pickard: emc-p...@hypercom.com > Dave Heald: davehe...@attbi.com > > For policy questions, send mail to: > Richard Nute: ri...@ieee.org > Jim Bacher: j.bac...@ieee.org > > Archive is being moved, we will announce when it is back on-line. > All emc-pstc postings are archived and searchable on the web at: > http://www.ieeecommunities.org/emc-pstc > 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: Ron Pickard: emc-p...@hypercom.com Dave Heald: davehe...@attbi.com For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org Archive is being moved, we will announce when it is back on-line. All emc-pstc postings are archived and searchable on the web at: http://www.ieeecommunities.org/emc-pstc
