BS EN ISO 7779-2010 声学.信息技术和通讯设备排放的空气噪声的测量

标准号：BS EN ISO 7779-2010
中文标准名称：声学.信息技术和通讯设备排放的空气噪声的测量
英文标准名称：Acoustics. Measurement of airborne noise emitted by information technology and telecommunications equipment
标准类型：Z32
发布日期：2010/11/30 12:00:00
实施日期：2010/11/30 12:00:00
中国标准分类号：Z32
国际标准分类号：17.140.20;35.020
适用范围：This International Standard specifies procedures for measuring and reporting the noise emission ofinformation technology and telecommunications equipment.NOTE 1 This International Standard is considered part of a noise test code (see 3.1.2) for this type of equipment, andis based on basic noise emission standards (see 3.1.1) ISO 3741, ISO 3744, ISO 3745 and ISO 11201.The basic emission quantity is the A-weighted sound power level which may be used for comparingequipment 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 thisInternational Standard in order to avoid undue restriction on existing facilities and experience. ISO 3741specifies comparison measurements in a reverberation test room; ISO 3744 and ISO 3745 specifymeasurements in an essentially free field over a reflecting plane. Any one of these three basic noise emissionstandards can be selected and used exclusively in accordance with this International Standard whendetermining sound power levels of a machine.The A-weighted sound power level is supplemented by the A-weighted emission sound pressure leveldetermined at the operator position(s) or the bystander positions, based on basic noise emission standardISO 11201. This sound pressure level is not a worker's immission rating level, but it can assist in identifyingany potential problems that could cause annoyance, activity interference, or hearing damage to operators andbystanders.Methods for determination of whether the noise emission includes prominent discrete tones or is impulsive incharacter are specified in Annexes D and E, respectively.This International Standard is suitable for type tests and provides methods for manufacturers and testinglaboratories to obtain comparable results.The methods specified in this International Standard allow the determination of noise emission levels for afunctional unit (see 3.1.4) tested individually.The procedures apply to equipment which emits broad-band noise, narrow-band noise and noise whichcontains discrete-frequency components, or impulsive noise.The sound power and emission sound pressure levels obtained can serve noise emission declaration andcomparison purposes (see ISO 9296).NOTE 2 The sound power and emission sound pressure levels obtained are not to be considered as installation noiseimmission levels; however, they can be used for installation planning (see ECMA TR/27.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).