本文件规定了如何计算: -测量吸声系数和等效吸声面积的不确定度 根据ISO 354；-实际吸声系数和加权吸声系数的不确定度根据 根据ISO 11654；-根据ISO 20189，物体吸声系数的不确定度；和-根据EN 1793-1确定的单个数字额定值的不确定性。 此外，在报告测量或加权吸声系数时使用不确定性 这是解释。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This document specifies how to calculate: — the uncertainty of sound absorption coefficients and equivalent sound absorption areas measured according to ISO 354;— the uncertainty of the practical and weighted sound absorption coefficients determined according to ISO 11654;— the uncertainty of the object sound absorption coefficient according to ISO 20189; and— the uncertainty of the single number rating determined according to EN 1793-1. Furthermore, the use of uncertainties in reporting measured or weighted sound absorption coefficients is explained.All current amendments available at time of purchase are included with the purchase of this document.