------------------------ From: [email protected] Subject: suspect conducted emissions Date: Tue, 17 Nov 1998 22:53:20 EST To: [email protected]
> Hello group, > > I recently carried out a conducted emission in our unlined screen room with no > EUT connected. I.e just the LISN inside and measuring receiver outside the > room. I was expecting the plot to be a horizontal line and very low perhaps in > the region of 10 or 20dB. Instead I noticed that the plot starts at about 40dB > at 150kHzand decreases to about 20dB at around 1MHz and then after that is a > horizontal line all the way to 30MHz. Bearing in mind that the room is very > well grounded and I use a reputable measuring device. My questions are: > > 1-Is this what one would expect to see? > 2-Why the noise floor so high in an screen room? > 3-What can we do to reduce the noise floor? > 4-What is the best method to ensure that the room is O.K? > > Any help and advice is appreciated. > > With regards > Peter > > E-mail: [email protected] Pete: Humor me. Put a 50 ohm termination on the input to your spectrum analyzer and repeat your scan. Look at your data, and then tell us what you think. OK? Regards, Ed -------------------------- Ed Price [email protected] Electromagnetic Compatibility Lab Cubic Defense Systems San Diego, CA. USA 619-505-2780 List-Post: [email protected] Date: 11/18/1998 Time: 09:21:10 -------------------------- --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
