Allen, >From bunches of years of designing and using sites, what I would suggest is, IMHO, use the money to reserve a large space in the parking lot free of obstacles. Current construction techniques in buildings use lots of steel "2x4s" for the walls and there will likely be steel in the floor above you. All of these contribute to resonances in the emissions measurements that are far too difficult to want to deal with. The best way to do radiated measurements is to be a minimalist. Get as far away from any structure as you can, put down a simple hardware cloth ground plane and throw a nylon tent over the product if it rains.
Best regards, Brent DeWitt Datex-Ohmeda Medical Louisville, CO > -----Original Message----- > From: [email protected] > [mailto:[email protected]]On Behalf Of Allen Tudor > Sent: Friday, April 23, 1999 1:27 PM > To: [email protected] > Subject: Precompliance Testing > > > Our division is in the process of constructing a new building. I > have been told that I will be given a room in which to make > pre-compliance radiated emissions measurements. However, ferrite > tiles or cones are out of the question (I have been told that I > can hang "chicken-wire" on the walls if I want to). > > Even though I am restricted in how much money can be spent, I > have the luxury of designing in features as the building is being > constructed. > > At a bare minimum, I think we should lay sheet metal or grid-wire > on the floor after the concrete is poured. This ground plane > should be grounded at each corner by ground rods. I am thinking > that if there is no steel framework near the room, this may > provide fairly good results. > > I would appreciate any recommendations on other cheap features > that I can design in while the building is under construction. > Also, what is the minimum size the room should be? How about > power wiring in the walls and in the ceiling. Should any > measures be taken to prevent radiated energy from coupling into > power wiring? > > Perfection is not the key issue here: repeatability is. We have > a local certified lab that I can compare my measurements with. > Once the room is complete, I can repeat my measurements at the > certified lab and develop the necessary correction factors. > > By the way, my product is dc powered shelf-level telecom equipment. > > Again, any advice will be appreciated. > > Thanks in advance. > > > Allen Tudor, Compliance Engineer > PairGain Technologies tel: (919)875-3382 > 2431-153 Spring Forest Rd. fax: (919)876-1817 > Raleigh, NC 27615 email: > [email protected] > > > > --------- > 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). > > --------- 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).
