------------------------ From: Bailin Ma <b...@namg.us.anritsu.com> Subject: RE: Grounding of screen room Date: Tue, 6 Oct 98 14:35:43 PDT To: emc-p...@ieee.org, TREG <t...@world.std.com> Cc: Mekonen Buzuayene <mbuzuay...@namg.us.anritsu.com>
> Hi Lauren, > > It is my understanding that properly grounding the screen room is important > in Conducted emission test and have little effect on Radiated emission > test. The way you described is a very good and simple method for evaluating > the shielding effectiveness (SE) of the screen room. The SE, however, is > not critical in Conducted emission test. > > A simple way, similar to what you described, to evaluate the background > noise of Conducted emission test is turning off the power of DUT when you > get ready to run the test to see if you can 'hear' anything on the > spectrum analyzer. > > Please correct me. Pardon, Barry, but I think I will. You should measure the Ambient conducted emission level by loading the LISN's with a resistive load sized to draw the same amount of power as your typical test specimen. This loads the external power source (some sites may be using their own generator or electronic power converter), allows the shielded enclosure powerline filter to work into a load impedance more normal than an open circuit, and validates the performance of the powerline filter and the LISN's (cheap or damaged filter inductors will degrade or even create noise). Regards, Ed -------------------------- Ed Price ed.pr...@cubic.com Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 619-505-2780 List-Post: emc-pstc@listserv.ieee.org Date: 10/07/1998 Time: 08:34:44 -------------------------- --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to majord...@ieee.org with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to ed.pr...@cubic.com, j...@gwmail.monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
