Stuart, Cispr 22:1997 clause 10.2.1 answers your question. The earlier version of Cispr 22 has similar wording.
For Class B equipment you may use a 20 dB/decade extrapolation to correct measured data, to compare to the limits, at closer distances. The rules do not say that the same is allowed for Class A equipment. Going from 3 to 10 meters: You would subtract 10.5 dB from your measurements (the formula is given in clause 10.6). Michael Peters -----Original Message----- From: Stuart Lopata To: emc Sent: 10/30/01 10:06 AM Subject: EN 55022 limits The radiated limits are stated for 10 meters but our measurements are at 3 meters. Is it ok to use 3 meter data and what should the new limits be (may be 10 dB higher)? Thanks, Stuart Lopata ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server. ------------------------------------------- This message is from the IEEE EMC Society Product Safety Technical Committee emc-pstc discussion list. Visit our web site at: http://www.ewh.ieee.org/soc/emcs/pstc/ To cancel your subscription, send mail to: majord...@ieee.org with the single line: unsubscribe emc-pstc For help, send mail to the list administrators: Michael Garretson: pstc_ad...@garretson.org Dave Heald davehe...@mediaone.net For policy questions, send mail to: Richard Nute: ri...@ieee.org Jim Bacher: j.bac...@ieee.org All emc-pstc postings are archived and searchable on the web at: No longer online until our new server is brought online and the old messages are imported into the new server.
