Environmental ambients are also a problem on OATS testing. Getting to know the environmental ambient profile helps. If you have a receiver with A-B trace capability, you can do a rough check by scanning with and without the UUT powered, and subtracting the scans, theoretically subtracting out the environmental ambients only. ALL potential UUT emanations need to be verified. On our 10m OATS, we control UUT power from the test bench for convenience.
Doug Frazee EMC Compliance Engineer Alliant Techsystems, Inc. Advanced Technology Applications 401 Defense Highway Annapolis, Maryland 21401 USA Tel: (410) 266-1793 FAX: (410) 266-1853 [email protected] >---------- >From: > > [email protected][SMTP:Moshe_Valdman@ISR-RHV-P1 >.CCMAIL.CompuServe.COM] >Sent: Sunday, August 10, 1997 5:25 AM >To: [email protected]; [email protected]; [email protected] >Subject: Re:RE: test equipment > >Hello all, > >I guess the biggest problem with in-plant radiated measurements >is environmental noise. Apart from turning the UUT (unit under test) >on and off, does anyone have a good technique to separate the UUT emissions >from >the environment? >In my experience (assuming you do not gave a shielded room)this could save up >to >50 percent of the testing time. >(A shielded room has its own problems of course re emissions amplitude >relative to an open site) > >thanks >moshe valdman > > ---------------------------------------------------- > > I'm looking for low end new/used equipment to set up a small test >lab > for radiated emissions. Any names of suppliers of such equipment >in > North America would be greatly appreciated. Specifically, I am > looking to purchase a spectrum analyzer and antenna that would be > acceptable for pre scans before going to a registered lab. > > > Any suggestions for equipment is greatly appreciated. > Thanks in advance > > > John Schippanoski > [email protected] > > > > >
