Hello, I just got hold of a copy of ANSI C63.4-2000 annex M. Does anyone have experience using the Table M1.1 spreadsheet? Some of the equations look wrong to me. It is probably my ignorance, but I could get lucky. :)
For example: You have 2 arrays of frequencies and field strength readings in uV/m. To calculate the difference in dB ANSI gives 20*log(value1/value2). Where value one and value 2 are two array elements. This is performed element by element on the array to create a third array. This third array is in dB. To take the mean of this array ANSI give this equation: 20*log(1/n*SUM(array3)) It strikes me as odd that I am taking the logarithm of a logarithm to get to the mean of the first array. Thanks, Mat Aschenberg ------------------------------------------- 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.
