Dear Members, Is there any minimum distance requirement between the edge of turntable (quiet zone) and the tip of absorbers in a 3m semi-anechoic chamber (interior metal-to-metal dimensions of 28'x18'x18')? I get an impression that one meter is required. I didn't find this distance requirement from ANSI C63.4. Clause 5 of EN 50147-2: 1996 states: "The vertical and horizontal polarization measurements in the rear position may be omitted if the closest point of the construction and/or absorbing material is at a distance greater than 1 m from the rear boundary of the tes volume." I assume keeping a 1 m distance is a good idea. However, a chamber manufacturer has a difficulty to do so. Could you please share your knowledge and comments? Thank you very much. Best regards, Grace - ---------------------------------------------------------------- This message is from the IEEE Product Safety Engineering Society emc-pstc discussion list. Website: http://www.ieee-pses.org/
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