本美国国家标准规定了确定声功率级或声音的方法 噪声源的声压级来自于在包围噪声的表面上测量的声压级 声源（机械或设备）在接近声源附近的无声场的环境中 或者更多的反射面。声功率级（或者，如果是突发噪声或瞬态噪声 A）声源产生的声级或加权声级 应用时，使用这些测量值进行计算。

This American National Standard specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured on a surface enveloping the noise source (machinery or equipment) in an environment that approximates to an acoustic free field near one or more reflecting planes. The sound power level (or, in the case of noise bursts or transient noise emission, the sound energy level) produced by the noise source, in frequency bands or with A-weighting applied, is calculated using those measurements.