May I add a note of caution: It may be worthwhile to check the permissible loading of the roof, especially when you are in the Southwest where roofs are mostly for shade and a few drops of rain. I guess that you don't want to appear suddenly in the conference room below.... Bogdan.
Gary McInturff wrote: > I'll agree with Brent, and others, the headaches of a metal room or the > metal studs et al, in a building are going to make you pull your hair out. > But there is an alternative to the parking lot. You may want to consider the > roof. The ground reference can be put up there as well, especially if you > are doing pre-compliance stuff. You don't have to give up parking space - > which is sure to irate somebody. The roof gets a little hot, but that only > gives you the opportunity to work in your cutoffs, and showing up to a > meeting with the suits dressed like this is always good for a laugh! > Gary > > -----Original Message----- > From: Brent DeWitt [SMTP:bdew...@ix.netcom.com] > Sent: Friday, April 23, 1999 7:12 PM > To: Allen Tudor; emc-p...@ieee.org > Subject: RE: Precompliance Testing > > 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: owner-emc-p...@majordomo.ieee.org > > [mailto:owner-emc-p...@majordomo.ieee.org]On Behalf Of Allen Tudor > > Sent: Friday, April 23, 1999 1:27 PM > > To: emc-p...@ieee.org > > 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: > > allen_tu...@pairgain.com > > > > > > > > --------- > > 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). > > > > > > --------- > 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). > > --------- > 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, > jim_bac...@monarch.com, ri...@sdd.hp.com, or > roger.volgst...@compaq.com (the list administrators). --------- 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, jim_bac...@monarch.com, ri...@sdd.hp.com, or roger.volgst...@compaq.com (the list administrators).
