Abstract
As the third international standard of ISO 9614 series (Acoustics—Determination of sound power levels of noise sources using sound intensity), the precision method by scanning is now being drafted by ISO/TC43/SC1/WG25. It will be Part 3 (Precision method for measurement by scanning), following Part 1 (Measurement at discrete points: precision, engineering and survey classes) and Part 2 (Measurement by scanning: engineering and survey classes). In this paper, the outline of the draft and discussions are introduced by focusing on the measurement accuracy, the methods for checking the adequacy of the measurement sound field (field indicators), and practical procedures.
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