ASA S1.4-2014/Part 2/Amd.1-2019/IEC 61672-2:2013 Amd.1:2017 PDF
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American National Standard for Electroacoustics – Sound Level Meters – Part 2: Pattern Evaluation Tests – Amendment 1( a nationally adopted international standard amendment). Amendment by American National Standards of the Acoustical Society of America, 08/13/2019
