A-Weighting 2 : The A-frequency weighting specified in the International Standard IEC 651:1979. (Note: A-frequency weighting is used because it approximates the response of the human ear)
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}