取消并取代ISO 3743（1988）。指定用于确定小型可移动噪声源的声功率水平的相对简单的工程方法。在这种直接方法中，被测源的A加权声功率电平是从每个麦克风位置的单个A加权声压级测量而不是乘以倍频带级的求和来确定的。该方法消除了对参考声源的需要，但需要使用特殊的混响测试室

Cancels and replaces ISO 3743 (1988). Specifies a relatively simple engineering method for determining the sound power levels of small, movable noise sources. In this direct method the A-weighted sound power level of the source under test is determined from a single A-weighted sound pressure level measurement at each microphone position, rather than from a summation of octave-band levels. This method eliminates the need for a reference sound source, but requires the use of a special reverberation test room.