BS EN 60651-1994 Specification for Sound level meters1.pdf

BRITISH STANDARD BS EN 60651:1994 IEC 60651:1979 Incorporating Amendment No. 1 Specification for Sound level meters The European Standard EN 60651:1994, with the incorporation of amendments A1:1994 and A2:2001, has the status of a British Standard ICS 17.140.50 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Licensed Copy: sheffieldun sheffieldun, na, Mon Sep 18 10:53:33 BST 2006, Uncontrolled Copy, (c) BSI BS EN 60651:1994 This British Standard, having been prepared under the direction of the Electronic Equipment Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 July 1994 © BSI 15 October 2001 The following BSI references relate to the work on this standard: Committee reference EEL/24 Special announcement in BSI News, May 1994 ISBN 0 580 23386 3 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries: AustriaItaly BelgiumLuxembourg DenmarkNetherlands FinlandNorway FrancePortugal GermanySpain GreeceSweden IcelandSwitzerland IrelandUnited Kingdom Amendments issued since publication Amd. No.DateComments 1311415 October 2001Indicated by a sideline Licensed Copy: sheffieldun sheffieldun, na, Mon Sep 18 10:53:33 BST 2006, Uncontrolled Copy, (c) BSI BS EN 60651:1994 © BSI 15 October 2001 i Contents Page Cooperating organizationsInside front cover National forewordii Foreword2 Text of EN 606514 National annex NA (informative) Committees responsible29 Licensed Copy: sheffieldun sheffieldun, na, Mon Sep 18 10:53:33 BST 2006, Uncontrolled Copy, (c) BSI BS EN 60651:1994 ii© BSI 15 October 2001 National foreword This British Standard has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is the English language version of EN 60651:1994 Sound level meters, including amendments A1:1994 and A2:2001, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 60651:1979 including amendments 1:1993 and 2:2000, published by the International Electrotechnical Commission (IEC). Amendment A1 was incorporated with the original BS EN 60651:1994. Amendment A2 has therefore been incorporated into BS EN 60651 as Amendment No. 1. BS EN 60651:1994 replaces BS 5969:1981 which is withdrawn. It should be noted that IEC 651 amendment 1:1993 contains an error which has been notified to IEC. Until such time as the error is corrected the following information applies to BS EN 60651:1994. In Appendix D (normative): Equations for design-goal frequency weightings equations (D1) and (D2) are to be read as follows. For the C-weighting: For the B-weighting: A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. (D1) (D2) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 29 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Sidelining in this document indicates the most recent changes by amendment. Licensed Copy: sheffieldun sheffieldun, na, Mon Sep 18 10:53:33 BST 2006, Uncontrolled Copy, (c) BSI ? EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 60651 January 1994 +A1 January 1994 +A2 January 2001 UDC 621.317.799.534.621.2.534.793:001.4:620.1:621.317.3Supersedes HD 425 S1:1983 Descriptors: Sound level meters, precision, requirements, testing, properties, definitions English version Sound level meters (including amendments A1:1994 and A2:2001) (IEC 60651:1979 + A1:1993 + A2:2000) Sonomètres (inclut les amendments A1:1994 et A2:2001) (CEI 60651:1979 +A1:1993 +A2:2000) Schallpegelmesser (enthält Änderungen A1:1994 und A2:2001) (IEC 60651:1979 +A1:1993 +A2:2000) This European Standard was approved by CENELEC on 1993-12-08. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels © 1994 Copyright reserved to CENELEC members Ref. No. EN 60651:1994 + A1:1994 + A2:2001 E Licensed Copy: sheffieldun sheffieldun, na, Mon Sep 18 10:53:33 BST 2006, Uncontrolled Copy, (c) BSI ? EN 60651:1994 © BSI 15 October 20012 Foreword As a consequence of the IEC-CENELEC Agreement, HD 425 S1:1983 (IEC 651:1979) was submitted to the CENELEC voting procedure for conversion into a European Standard. The text of the International Standard was approved by CENELEC as EN 60651 on 8 December 1993. The following dates were fixed. Annexes designated “ normative” are part of the body of the standard. In this standard, Appendix A, Appendix B, Appendix C and Annex ZA are normative. Foreword of EN 60651/A1:1994 The text of document 29(CO)203, as prepared by IEC Technical Committee No. 29: Electroacoustics, was submitted to the IEC-CENELEC parallel vote in March 1993. The reference document was approved by CENELEC as amendment A1 to EN 60651 on 8 December 1993. The following dates were fixed: Annexes designated “ normative” are part of the body of the standard. In this standard, Appendix D and Annex ZA are normative. Foreword to amendment A2 The text of document 29/458/FDIS, future amendment 2 to IEC 60651:1979, prepared by IEC TC 29, Electroacoustics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A2 to EN 60651:1994 on 2000-11-01. The following dates were fixed: Annexes designated “ normative” are part of the body of the standard. Annexes designated “ informative” are given for information only. In this standard Annex ZA is normative and Annex E is informative. Annex ZA has been added by CENELEC. Contents Page Foreword2 1Scope4 2Object and general requirements4 3Definitions5 4General characteristics6 5Directional characteristics of the microphone and instrument case7 6Frequency weighting and amplifier characteristics8 7Detector and indicator characteristics10 8Sensitivity to various environments14 9Calibration and verification of the basic characteristics of the sound level meter14 10Provision for use with auxiliary equipment17 11Rating information and instruction manual18 12 Electromagnetic and electrostatic compatibility requirements and test procedures19 Appendix A Tests of the overload and detection characteristics24 Appendix B Diffuse field sensitivity25 latest date of publication of an identical national standard(dop) 1994-12-01 latest date of withdrawal of conflicting national standards(dow) latest date of publication of an identical national standard(dop) 1994-12-01 latest date of withdrawal of conflicting national standards(dow) 1994-12-01 latest date by which the amendment has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 2001-08-01 latest date by which the national standards conflicting with the amendment have to be withdrawn(dow) 2003-11-01 Licensed Copy: sheffieldun sheffieldun, na, Mon Sep 18 10:53:33 BST 2006, Uncontrolled Copy, (c) BSI ? EN 60651:1994 © BSI 15 October 2001 3 Page Appendix C Theoretical response to tone bursts25 Appendix D (normative) Equations for design-goal frequency weightings26 Appendix E (informative) Emission limits27 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications28 Figure 110 Figure 212 Figure A.124 Table I Maximum change of reading, in decibels, during 1 h of operation7 Table II Maximum change in sensitivity within an angle of ±30? from the reference direction, in decibels7 Table III Maximum change in sensitivity within an angle of ±90? from the reference direction, in decibels8 Table IV Frequency weighting characteristics Relative free-field frequency response in the reference direction, in decibels8 Table V Tolerances on frequency weighting characteristics given in Table IV for each instrument type, in decibels9 Table VI Tolerances on level range control accuracy in various frequency ranges, in decibels10 Table VII Maximum error, in decibels, for tests of crest factor (CF) capability11 Table VIII Response to tone bursts11 Table IX Maximum overshoot, in decibels11 Table X Response to a single burst12 Table XI Response to a continuous sequence of bursts12 Table XII Tolerances on level linearity referred to the reference sound pressure level in the frequency range 31.5 Hz to 8 000 Hz (20 Hz to 12 500 Hz for Type 0), in decibels13 Table XIII Tolerances on differential level linearity in the frequency range 31.5 Hz to 8 000 Hz (20 Hz to 12 500 Hz for Type 0), in decibels13 Licensed Copy: sheffieldun sheffieldun, na, Mon Sep 18 10:53:33 BST 2006, Uncontrolled Copy, (c) BSI ? EN 60651:1994 4 © BSI 15 October 2001 1 Scope 1.1 General This standard describes instruments (sound level meters) for the measurement of certain frequency and time weighted sound pressure levels. 1.2 Types This standard specifies sound level meters of four degrees of precision, designated Types 0, 1, 2 and 3. 1.3 Tolerances The specifications for Types 0, 1, 2 and 3 sound level meters have the same centre values and differ only in the tolerances allowed. Tolerances generally broaden as the type number increases and differ for the various types to a degree which affects manufacturing costs significantly. 1.4 Characteristics specified This standard specifies the following characteristics of sound level meters: a) directional characteristics; b) frequency weighting characteristics; c) time weighting, detector and indicator characteristics; d) sensitivity to various environments. 1.5 Tests specified This standard specifies electrical and acoustical tests to verify compliance with the characteristics specified (see Sub-clause 1.4). It also describes the method for absolute sensitivity calibration. 2 Object and general requirements 2.1 Object Owing to the complexity of operation of the human ear, it is not possible at present to design an objective noise measuring apparatus to give results which are absolutely comparable, for all types of noise, with those obtained by subjective methods. However, it is considered essential to standardize an apparatus by which sounds can be measured under closely defined conditions so that results obtained by users of such apparatus are always reproducible within stated tolerances. The object of this standard is to ensure specified accuracy and stability of a particular sound level meter in practice, and to reduce to the practical minimum any differences in equivalent measurements taken with devices of various makes and models which satisfy the requirements of this standard. 2.2 Applications The Type 0 sound level meter is intended as a laboratory reference standard. Type 1 is intended especially for laboratory use, and for field use where the acoustical environment can be closely specified and/or controlled; the measurement accuracy possible with such an instrument will generally not be realized under ordinary conditions. The Type 2 sound level meter is suitable for general field applications. Type 3 is intended primarily for field noise survey applications to determine whether an established noise limit has been significantly violated. Sound level meters intended for field use have to meet rigorous environmental specifications. Other sound level meters are only used in laboratories where the environment is controlled, and it is not justifiable to require such instruments to meet the design constraints imposed on field instruments. The distinction is provided for in Sub-clauses 8.5 and 8.6 which specify additional requirements for instruments intended for field use. Licensed Copy: sheffieldun sheffieldun, na, Mon Sep 18 10:53:33 BST 2006, Uncontrolled Copy, (c) BSI ? EN 60651:1994 © BSI 15 October 2001 5 2.3 Weighting characteristics 2.3.1 Frequency weighting A sound level meter shall have one or more frequency weighting characteristics designated A, B and C. Optional weighting characteristics which may be included are: i) a characteristic designated Lin for which the response is constant as a function of frequency; ii) a characteristic designated D as specified in IEC Publication 537, Frequency Weighting for the Measurement of Aircraft Noise (D-weighting). 2.3.2 Time weighting A sound level meter shall have one or more time weighting characteristics designated S, F and I. A Peak characteristic may also be included. 2.3.3 Significance of weighting characteristics In the past, frequency weighting and time weighting have been associated with certain characteristics of the ear. However, recent work has not substantiated these historical associations so that frequency and time weighting characteristics of sound level meters may be considered to be conventional. The A weighting characteristic is now frequently specified for rating sounds irrespective of level and is no longer restricted to low level sounds. Furthermore, standardization of the I time weighting characteristic does not imply that the relationship between loudness or hearing damage risk of impulsive sounds and the physical characteristics of sounds is thereby precisely represented. However, a wide dynamic range, overload indication, and a high crest factor capability are necessary for the accurate measurement of short-duration sounds, and these characteristics are specified in this standard for sound level meters which incorporate the I time weighting characteristic. 2.4 Optional features This standard is intended to allow special features in a sound level meter such as wide indicator range, digital display, recording display and automatic range changing. 2.5 Method of use It is recognize