Richard and Robert: I agree with Richard, although I would recommend the opposite. I would Test at 10 meters, and bring the antenna in to 3 meters if I come across frequencies where ambients are interfering. This provides most data at the specified test distance, while allowing for correction of signals that appear near ambients.
Randy Flinders EMC Test Engineer Emulex Network Systems ---------- From: WOODS, RICHARD To: [email protected]; [email protected] Subject: RE: Distance of Measurements List-Post: [email protected] Date: Thursday, June 12, 1997 7:07AM 10m is the standard, but other distances are allowed. If there is ever a problem, data taken at 10 m will be used to judge your equipment. As a practical matter, we test our equipment at 3m because of ambients. My recommendation is to test at 10 m unless there are circumstances that prevent it or complicate the measurements. If there are strong ambients, a test at 10m may take longer which would translate into cost. You can always test at 3m and then retest signals with minimal margin at 10m. ---------- From: [email protected] To: [email protected] Subject: Distance of Measurements List-Post: [email protected] Date: Wednesday, June 11, 1997 4:11PM For measuring emissions per CISPR 22B what is the proper distance for the placement of the antenna? Is it 3m? or 10m? [I'm running across reputable labs that claim there is nothing wrong with measuring everything at 3m, just like FCC B.] - Robert - [email protected] AJM Electronics --- ~ OLX 2.1 TD ~ You'd be surprised how much it costs to look this cheap.
