声学 - 信息技术和电信设备发射的空中噪声测量

[中文适用范围]： 本文件规定了测量和报告信息技术和电信设备噪声排放的程序。 注 1：本文件被视为此类设备噪声测试规范（见 3.1.2）的一部分，并且基于基本噪声排放标准（见 3.1.1）ISO 3741、ISO 3744、ISO 3745、ISO 9295 和 ISO 11201. 基本排放量是A计权声功率级，可用于比较不同制造商的同类型设备，或比较不同设备。 本文件规定了确定声功率级的三个基本噪声排放标准，以避免对现有设施和经验的不当限制。 ISO 3741 规定了混响测试室中的比较测量； ISO 3744 和 ISO 3745 规定了反射平面上基本自由场中的测量。 在确定机器的声功率级时，可以根据本文件专门选择和使用这三种基本噪声排放标准中的任何一种。 A 计权声功率级由在操作员位置或旁观者位置确定的 A 计权发射声压级进行补充，基于基本噪声发射标准，它可以帮助识别可能导致烦恼、活动干扰或操作员和旁观者的听力受损。 附件 D 中规定了确定噪声发射是否包含显着离散音调的方法。 本文件适用于型式试验，并为制造商和测试实验室提供了获得可比结果的方法。 本文件中规定的方法允许确定单独测试的功能单元（见 3.1.4）的噪声发射水平。 这些程序适用于发出宽带噪声、窄带噪声和包含离散频率分量的噪声或脉冲噪声的设备。 获得的声功率和发射声压级可用于噪声发射声明和比较目的（参见ISO 9296[3]）。 注 2：获得的声功率级和发射声压级不应被视为安装噪声发射级；然而，它们可用于安装规划（参见 ECMA TR/27[11]）。 如果获得的声功率级是针对同一生产系列的多个功能单元确定的，则它们可用于确定该生产系列的统计值（参见 ISO 9296[3]）。 [外文原描述]： This document specifies procedures for measuring and reporting the noise emission of information technology and telecommunications equipment. NOTE 1 This document is considered part of a noise test code (see 3.1.2) for this type of equipment and is based on basic noise emission standards (see 3.1.1) ISO 3741, ISO 3744, ISO 3745, ISO 9295 and ISO 11201. The basic emission quantity is the A-weighted sound power level, which can be used for comparing equipment of the same type but from different manufacturers, or for comparing different equipment. Three basic noise emission standards for determination of the sound power levels are specified in this document in order to avoid undue restriction on existing facilities and experience. ISO 3741 specifies comparison measurements in a reverberation test room; ISO 3744 and ISO 3745 specify measurements in an essentially free field over a reflecting plane. Any of these three basic noise emission standards can be selected and used exclusively in accordance with this document when determining sound power levels of a machine. The A-weighted sound power level is supplemented by the A-weighted emission sound pressure level determined at the operator position or the bystander positions, based on basic noise emission standard ISO 11201. This sound pressure level is not a level of noise immission at a work station (see 3.2.12), but it can assist in identifying any potential problems that could cause annoyance, activity interference or hearing damage to operators and bystanders. Methods for determination of whether the noise emission includes prominent discrete tones are specified in Annex D. This document is suitable for type tests and provides methods for manufacturers and testing laboratories to obtain comparable results. The methods specified in this document allow the determination of noise emission levels for a functional unit (see 3.1.4) tested individually. The procedures apply to equipment which emits broad-band noise, narrow-band noise and noise which contains discrete-frequency components, or impulsive noise. The sound power and emission sound pressure levels obtained can serve noise emission declaration and comparison purposes (see ISO 9296[3]). NOTE 2 The sound power levels and emission sound pressure levels obtained are not intended to be considered as installation noise immission levels; however, they can be used for installation planning (see ECMA TR/27[11]). If sound power levels obtained are determined for a number of functional units of the same production series, they can be used to determine a statistical value for that production series (see ISO 9296[3]).