ISO 9295:2015规定了在以16 kHz为中心的倍频带（包括11.2 kHz和22.4 kHz之间的频率）覆盖的频率范围内，确定机械和设备发出的高频噪声声功率级的四种方法。它们是对ISO 3741和ISO 3744中描述的方法的补充。前三种方法基于混响试验室技术。第四种方法利用反射平面上的自由场。 ISO 3741或ISO 3744（如适用）中规定了设备安装和操作的试验条件。

ISO 9295:2015 specifies four methods for the determination of the sound power levels of high-frequency noise emitted by machinery and equipment in the frequency range covered by the octave band centred at 16 kHz, which includes frequencies between 11,2 kHz and 22,4 kHz. They are complementary to the methods described in ISO 3741 and ISO 3744. The first three methods are based on the reverberation test room technique. The fourth method makes use of a free field over a reflecting plane. The test conditions which prescribe the installation and operation of the equipment are those specified in ISO 3741 or ISO 3744 as applicable.