Just finished 2d OATS site - was not able to detect much of anything. Went back to indoors fully anechoic, where the noise plot is deafening.
This is a simple 100W unit with one main ac/dc converter and (6) dc current modulators. Construction is mostly plastic, with exception of metal base plate. As it is Class II construction, there is no ground wire. Bad stuff is at 40-80MHz and 200-500MHz. Did some isolation troubleshooting - looks like the input power cord is the main radiator. The EMC engineers at all three sites are both baffled and fascinated and want a sample unit to play with. I am very happy that they are amused, but I have to ship a product and cannot afford to support the Southern California EMC industry. thanks, Brian > -----Original Message----- > From: [email protected] [mailto:[email protected]]On Behalf Of Brian > O'Connell > Sent: Saturday, February 12, 2011 12:25 PM > To: [email protected] > Subject: OATS vs anechoic > > > Good People, > > Have tested at several sites. All are 'big' names and have a > good reputation. > > The 10m fully anechoic chamber data indicates from +5dB to > +11dB in several frequencies; while the 10m OATS says the > unit passes Class B, min -4.2dB. > > Huh?!? What is the physics behind the difference between an > outside site and absorbers? Where are the Borg when you need them? > > Brian > > - > ---------------------------------------------------------------- > 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://product-compliance.oc.ieee.org/ > Graphics (in well-used formats), large files, etc. can be > posted to that URL. > > 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]> > > - ---------------------------------------------------------------- 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://product-compliance.oc.ieee.org/ Graphics (in well-used formats), large files, etc. can be posted to that URL. 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]>
