ANSI_S12.10-2002.pdf

ANSI S12.10-2002IS07779:1999Reaffirmed by ANSIOctober 19,2007AMERICAN NATIONAL STANDARDAcoustics-Measurement of airborne noise emitted byinformation technology and telecommunicationsequipment(HVINVLS SIVNtOOZ-OIZIS ISNV6661:69000slAccredited Standards Committee S12,NoiseStandards SecretariatAcoustical Society of America35 Pinelawn Road,Suite 114EMelville,New York 11747-3177Not for ResaleThe American National Standards Institute,Inc.(ANSI)is the nationalcoordinator of voluntary standards development and the clearinghouse in theU.S.A.for information on national and international standards.The Acoustical Society of America(ASA)is an organization of scientists andengineers formed in 1929 to increase and diffuse the knowledge of acousticsand to promote its practical applications.Not fo ResaleANSI S12.10-2002IS07779:1999AMERICAN NATIONAL STANDARDAcoustics Measurement of airborne noiseemitted by information technology andtelecommunications equipmentA Nationally Adopted International StandardSecretariatAcoustical Society of AmericaApproved 21 November 2002American National Standards Institute,Inc.AbstractThis Nationally Adopted International Standard specifies methods for the measurement of airborne noise emitted byinformation technology and telecommunications equipment.Hitherto,a wide variety of methods have been appliedby individual manufacturers and users to satisfy particular equipment or application needs.These diverse practiceshave,in many cases,made comparison of noise emission difficult.This Nationally Adopted International Standardsimplifies such comparisons and is the basis for the declaration of the noise emission levels of informationtechnology and telecommunications equipment.This Standard is the National Adoption of ISO 7779:1999 and its amendment ISO 7779:1999/FDAM 1.SAeoemsiSoeewctmASNot for RessleAMERICAN NATIONAL STANDARDS IN ACOUSTICSThe Acoustical Society of America(ASA)provides the Secretariat for Accredited Standards Committees SIon Acoustics,S2 on Mechanical Vibration and Shock,S3 on Bioacoustics,and S12 on Noise.Thesecommittees have wide representation from the technical community(manufacturers,consumers,tradeassociations,general interest,and government representatives).The standards are published by theAcoustical Society of America through the American Institute of Physics as American National Standardsafter approval by their respective standards committees and the American National Standards Institute.These standards are developed and published as a public service to provide standards useful to the public,industry,and consumers,and to Federal,State and local governments.Each of the Accredited Standards Committees operating in accordance with procedures approved byAmerican National Standards Institute(ANSI)is responsible for developing,voting upon,and maintaining orrevising its own standards.The ASA Standards Secretariat administers committee organization and activity,and provides liaison between the Accredited Standards Committees and ANSI.After the standards have beenproduced and adopted by the Accredited Standards Committees,and approved as American NationalStandards by ANSI,the ASA Standards Secretariat arranges for their publication and distribution.An American National Standard implies a consensus of those substantially concerned with its scope andprovisions.Consensus is established when,in the judgment of the ANSI Board of Standards Review,substantial agreement has been reached by directly and materially affected interests.Substantial agreementmeans much more than a simple majority,but not necessarily unanimity.Consensus requires that all viewsand objections be considered,and that a concerted effort be made toward their resolution.The use of an American National Standard is completely voluntary.Their existence does not in any respectpreclude anyone,whether he has approved the standards or not,from manufacturing,marketing,purchasing,or using products,processes,or procedures not conforming to the standards.NOTICE:This Nationally Adopted International Standard may be revised or withdrawn at any time.Theprocedures of the American National Standards Institute require that action be taken periodically to reaffirm,revise,or withdraw a standard.Standards SecretariatAcoustical Society of America35 Pinelawn Road,Suite 114EMelville,New York 11747-3177Telephone631-390-0215FAX631-390-0217E-mailasastdsaip.orgC 2002 by the Acoustical Society of America.This Nationally Adopted International Standard may not be reproduced in whole or in part in anyform for sale,promotion,or any commercial purpose,or any purpose not falling within the provisions of the Copyright Act of 1976,withoutprior written permission of the publisher.For permission,address a request to the Standards Secretariat of the Acoustical Society of America.These materials are subject to copyright claims of ISO,IEC,ANSI,and ASA.No part of this publication may be reproduced in any form,including an electronic retrieval system,without the prior written permission of the Acoustical Society of America(ASA).All requestspertaining to this standard should be submitted to the Acoustical Society of America(ASA).Not for ResaleContents1Scope.2Normative references.23Terms and definitions.23.1General definitions.23.2Acoustical definitions.44Conformance requirements.55Installation and operating conditions.55.1Equipment installation.55.2Input voltage and frequency.5.3Equipment operation.6Method for determining sound power levels of equipment in reverberation rooms.86.1General86.2Measurement uncertainty.86.3Test environment.6.4Instrumentation.96.5Installation and operation of equipment:General requirements106.6Microphone positions and source locations.16.7Measurement ofsound pressure level.106.8Measurement of the sound pressure level of the reference sound source.1I6.9Calculation of space/time-averaged band sound pressure level.I6.10Calculation of sound power level.17Method for determining sound power levels of equipment under essentially free-fieldconditions over a reflecting plane.137.1General.137.2Measurement uncertainty137.3Test environment147.4Instrumentation.14Not for Ressle