1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN ISO 7779:2010Acoustics Measurementof airborne noise emitted byinformation technology andtelecommunications equipment(ISO 7779:2010)BS EN ISO 7779:2010 BRITISH STANDARDNatio
2、nal forewordThis British Standard is the UK implementation of EN ISO 7779:2010.It supersedes BS EN ISO 7779:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee EH/1/4, Machinery noise.A list of organizations represented on this committee can beobtained
3、 on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 68977 2ICS 17.140.20; 35.020Compliance with a British Standard cannot confer immunity fromlegal obligations.Th
4、is British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2010.Amendments issued since publicationDate Text affectedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 7779 August 2010 ICS 17.140.20; 35.020 Supersedes EN ISO 7779:2001Engl
5、ish Version Acoustics - Measurement of airborne noise emitted by information technology and telecommunications equipment (ISO 7779:2010) Acoustique - Mesurage du bruit arien mis par les quipements lis aux technologies de linformation et aux tlcommunications (ISO 7779:2010) Akustik - Geruschemissions
6、messung an Gerten der Informations- und Telekommunikationstechnik (ISO 7779:2010) This European Standard was approved by CEN on 26 July 2010. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a nat
7、ional standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in
8、 any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic,
9、 Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORM
10、ALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 7779:2010: EBS EN ISO 7779:2010 EN ISO 7779:2010 (E) 3 Foreword This document (E
11、N ISO 7779:2010) has been prepared by Technical Committee ISO/TC 43 “Acoustics“ in collaboration with Technical Committee CEN/TC 211 “Acoustics” the secretariat of which is held by DS. This European Standard shall be given the status of a national standard, either by publication of an identical text
12、 or by endorsement, at the latest by February 2010, and conflicting national standards shall be withdrawn at the latest by February 2010. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held respons
13、ible for identifying any or all such patent rights. This document supersedes EN ISO 7779:2001. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus
14、, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 7779
15、:2010 has been approved by CEN as a EN ISO 7779:2010 without any modification. BS EN ISO 7779:2010ISO 7779:2010(E) ISO 2010 All rights reserved vIntroduction This International Standard specifies methods for the measurement of airborne noise emitted by information technology and telecommunications (
16、ITT) equipment. Hitherto, a wide variety of methods have been applied by individual manufacturers and users to satisfy particular equipment or application needs. These diverse practices have, in many cases, made comparison of noise emission difficult. This International Standard simplifies such comp
17、arisons and is the basis for the declaration of the noise emission levels of ITT equipment. In order to ensure accuracy, validity and acceptability, this International Standard is based on the basic International Standards for determination of the sound power level and for determination of the emiss
18、ion sound pressure level at the operator position(s) and bystander position(s). Furthermore, implementation is simplified by conformity with these International Standards. In many cases, free-field conditions over a reflecting plane are realised by hemi-anechoic rooms. These rooms may be particularl
19、y useful during product design to locate and to improve individual contributing noise sources. Reverberation rooms may be more economical for production control and for obtaining sound power levels for noise emission declaration purposes. The method for measuring the emission sound pressure level at
20、 the operator or bystander positions (based on ISO 11201) is specified in a separate clause, as this level is not considered to be primary noise emission declaration information. The measurements can, however, be carried out in conjunction with those for sound power determination in a free field ove
21、r a reflecting plane. For comparison of similar equipment, it is essential that the installation conditions and mode of operation be the same. In Annex C these parameters are standardized for many categories of equipment. This International Standard is based on ECMA-74. BS EN ISO 7779:2010BS EN ISO
22、7779:2010INTERNATIONAL STANDARD ISO 7779:2010(E) ISO 2010 All rights reserved 1Acoustics Measurement of airborne noise emitted by information technology and telecommunications equipment 1 Scope This International Standard specifies procedures for measuring and reporting the noise emission of informa
23、tion 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, and is based on basic noise emission standards (see 3.1.1) ISO 3741, ISO 3744, ISO 3745 and ISO 11201. The basic emission quantity is t
24、he A-weighted sound power level which may 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 International Standard in order to
25、 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 one of these three basic noise emission standards can be selec
26、ted and used exclusively in accordance with this International Standard 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(s) or the bystander positions, based on basic
27、 noise emission standard ISO 11201. This sound pressure level is not a workers immission rating level, 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 no
28、ise emission includes prominent discrete tones or is impulsive in character are specified in Annexes D and E, respectively. This International Standard is suitable for type tests and provides methods for manufacturers and testing laboratories to obtain comparable results. The methods specified in th
29、is International Standard 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 po
30、wer and emission sound pressure levels obtained can serve noise emission declaration and comparison purposes (see ISO 9296). NOTE 2 The sound power and emission sound pressure levels obtained are not to be considered as installation noise immission levels; however, they can be used for installation
31、planning (see ECMA TR/274). 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). BS EN ISO 7779:2010ISO 7779:2010(E) 2 ISO 2010 All rights reserved2 N
32、ormative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 266, Acoustics Preferred
33、frequencies ISO 3741, Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Precision methods for reverberation test rooms ISO 3744, Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Engin
34、eering methods for an essentially free field over a reflecting plane ISO 3745, Acoustics Determination of sound power levels and sound energy levels of noise sources using sound pressure Precision methods for anechoic test rooms and hemi-anechoic test rooms ISO 6926, Acoustics Requirements for the p
35、erformance and calibration of reference sound sources used for the determination of sound power levels ISO 9295, Acoustics Measurement of high-frequency noise emitted by computer and business equipment ISO 9296, Acoustics Declared noise emission values of computer and business equipment ISO 11201, A
36、coustics Noise emitted by machinery and equipment Determination of emission sound pressure levels at a work station and at other specified positions in an essentially free field over a reflecting plane with negligible environmental corrections ISO 11203, Acoustics Noise emitted by machinery and equi
37、pment Determination of emission sound pressure levels at a work station and at other specified positions from the sound power level IEC 60942, Electroacoustics Sound calibrators IEC 61260, Electroacoustics Octave-band and fractional-octave-band filters IEC 61672-1, Electroacoustics Sound level meter
38、s Part 1: Specifications ECMA-74, Measurement of airborne noise emitted by information technology and telecommunications equipment1)3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 3744, ISO 11201, and the following apply. 3.1 General definitions 3.1.
39、1 basic noise emission standard B-type standard standard which specifies the procedure for determining the noise emission of machinery and equipment in such a way as to obtain reliable, reproducible results with a specified degree of accuracy ISO 12001:19962, 3.1 1) Available viewed 2010-07-13 at: h
40、ttp:/www.ecma-international.org/publications/files/ECMA-ST/ECMA-74.pdf BS EN ISO 7779:2010ISO 7779:2010(E) ISO 2010 All rights reserved 33.1.2 noise test code C-type standard standard that is applicable to a particular class, family or type of machinery or equipment, which specifies all the informat
41、ion necessary to carry out efficiently the determination, declaration and verification of the noise emission characteristics under standardized conditions ISO 12001:19962, 3.2 NOTE This International Standard, together with ISO 9295 and ISO 9296, comprise the noise test code for ITT equipment. 3.1.3
42、 information technology and telecommunications equipment ITT equipment equipment for information processing, and components thereof, used in homes, offices, server installations, telecommunications installations or similar environments 3.1.4 functional unit unit of information technology and telecom
43、munications equipment, either with or without its own end-use enclosure, that is tested or intended to be tested in accordance with the procedures of this International Standard NOTE 1 A functional unit can comprise more than one unit of ITT equipment when such units are to be tested together in acc
44、ordance with the methods of this International Standard. A functional unit can also comprise one or more units of ITT equipment coupled to one or more units of non-ITT equipment, such as power modules, water pumps, or refrigeration units, when such equipment is necessary for the normal operation of
45、the ITT equipment. NOTE 2 Functional units of ITT equipment can take on a wide range of forms, including commercially available products, prototype units under development or sub-assemblies and components thereof. 3.1.5 work station operator position position in the vicinity of the equipment under t
46、est which is intended for the operator NOTE 1 Adapted from ISO 11201:2010, 3.11. NOTE 2 This term does not refer to a computer “workstation”, which denotes a high-performance, single-user computer. 3.1.6 operating mode condition in which the equipment under test is performing its intended function(s
47、) 3.1.7 idle mode one or more steady-state conditions in which the equipment being tested is energized but is not operating 3.1.8 floor-standing equipment functional unit which is intended to be installed on the floor 3.1.9 table-top equipment functional unit which has a complete enclosure and which
48、 is intended to be installed or used on a table, desk or separate stand 3.1.10 wall-mounted equipment functional unit which is normally mounted against or in a wall and which does not have a stand of its own BS EN ISO 7779:2010ISO 7779:2010(E) 4 ISO 2010 All rights reserved3.1.11 sub-assembly functi
49、onal unit, generally without its own end-use enclosure, intended to be installed in another unit of ITT equipment or assembled together with other sub-assemblies or units of ITT equipment into a single end-use enclosure 3.1.12 rack-mountable unit functional unit that is designed to be installed in an end-use enclosure, in the form of a rack, frame, or cabinet, which can be fully enclosed, partially enclosed, or open frame 3.1.13 rack-enclosed system functional unit in the form of a rack, frame, or cab
