ISO 3741:2010规定了根据混响试验室中测量的声压级确定噪声源声功率级或声能级的方法。噪声源产生的声功率级（或者，在噪声爆发或瞬态噪声发射的情况下，声能量级）在宽度为三分之一倍频程的频带内，使用这些测量值进行计算，包括修正，以考虑试验时间和地点的气象条件与参考特性阻抗对应的气象条件之间的任何差异。给出了直接法和比较法测定声功率级和声能级的测量和计算步骤。 一般来说，感兴趣的频率范围包括三分之一倍频程频带，其中频带频率从100 Hz到10 000 Hz。附录中给出了在较低频率的扩展频率范围内应用规定方法的指南。ISO 3741:2010不适用于超过10000 Hz三分之一倍频程的频率范围。 ISO 3741:2010中规定的方法适用于ISO 12001中定义的所有类型的噪声（稳定、非稳定、波动、孤立声能爆发等）。 被测噪声源可以是设备、机器、部件或子组件。ISO 3741:2010适用于体积不大于混响试验室体积2%的噪声源。 对于体积大于试验室体积2%的光源，可能无法实现ISO 12001:1996中定义的精度等级1（精度等级）的结果。 适用于按照ISO 3741:2010进行测量的试验室是满足规定要求的混响试验室。 给出了根据ISO 3741:2010确定的声功率级和声能级的不确定度信息，用于在有限频带内进行的测量以及从中进行的A加权频率计算。不确定度符合ISO 12001:1996，精度等级1（精度等级）。

ISO 3741:2010 specifies methods for determining the sound power level or sound energy level of a noise source from sound pressure levels measured in a reverberation test room. 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 of width one-third-octave, is calculated using those measurements, including corrections to allow for any differences between the meteorological conditions at the time and place of the test and those corresponding to a reference characteristic impedance. Measurement and calculation procedures are given for both a direct method and a comparison method of determining the sound power level and the sound energy level. In general, the frequency range of interest includes the one-third-octave bands with mid-band frequencies from 100 Hz to 10 000 Hz. Guidelines for the application of the specified methods over an extended frequency range in respect to lower frequencies are given in an annex. ISO 3741:2010 is not applicable to frequency ranges above the 10 000 Hz one-third-octave band. The methods specified in ISO 3741:2010 are suitable for all types of noise (steady, non-steady, fluctuating, isolated bursts of sound energy, etc.) defined in ISO 12001. The noise source under test can be a device, machine, component or sub-assembly. ISO 3741:2010 is applicable to noise sources with a volume not greater than 2 % of the volume of the reverberation test room. For a source with a volume greater than 2 % of the volume of the test room, it is possible that the achievement of results as defined in ISO 12001:1996, accuracy grade 1 (precision grade) is not feasible. The test rooms that are applicable for measurements made in accordance with ISO 3741:2010 are reverberation test rooms meeting specified requirements. Information is given on the uncertainty of the sound power levels and sound energy levels determined in accordance with ISO 3741:2010, for measurements made in limited bands of frequency and for A-weighted frequency calculations from them. The uncertainty conforms to ISO 12001:1996, accuracy grade 1 (precision grade).