1、BSI Standards PublicationElectroacoustics Sound level metersPart 3: Periodic testsBS EN 61672-3:2013National forewordThis British Standard is the UK implementation of EN 61672-3:2013. It is identical to IEC 61672-3:2013. It supersedes BS EN 61672-3:2006 which is withdrawn.The UK participation in its
2、 preparation was entrusted to TechnicalCommittee EPL/29, Electroacoustics.A list of organizations represented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions ofa contract. Users are responsible for its correct app
3、lication. The British Standards Institution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 68849 2ICS 17.140.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Commi
4、ttee on 31 January 2014.Amendments/corrigenda issued since publicationDate Text affectedBRITISH STANDARDBS EN 61672-3:2013EUROPEAN STANDARD EN 61672-3 NORME EUROPENNE EUROPISCHE NORM December 2013 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrot
5、echnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17, B - 1000 Brussels 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61672-3:2013 E ICS 17.140.50 Supersedes EN 61672-3:2
6、006 English version Electroacoustics - Sound level meters - Part 3: Periodic tests (IEC 61672-3:2013) Electroacoustique - Sonomtres - Partie 3: Essais priodiques (CEI 61672-3:2013) Elektroakustik - Schallpegelmesser - Teil 3: Periodische Einzelprfung (IEC 61672-3:2013) This European Standard was app
7、roved by CENELEC on 2013-11-04. 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 nat
8、ional standards may be obtained on application to the CEN-CENELEC Management Centre 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
9、own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedon
10、ia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 61672-3:2013EN 61672-3:2013 - 2 - Foreword The text of documen
11、t 29/814/FDIS, future edition 2 of IEC 61672-3, prepared by IEC/TC 29 “Electroacoustics“ in cooperation with the International Organization of Legal Metrology (OIML), was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as EN 61672-3:2013. The following dates are fixed: latest date
12、 by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2014-08-04 latest date by which the national standards conflicting with the document have to be withdrawn (dow) 2016-11-04 This document supersedes EN 61672-3:2003.
13、 EN 61672-3:2013 includes the following significant technical changes with respect to EN 61672-3:2003. In this second edition, conformance to specifications is demonstrated when a) measured deviations from design goals do not exceed the applicable acceptance limits, and b) the uncertainty of measure
14、ment does not exceed the corresponding maximum-permitted uncertainty, with both uncertainties determined for a coverage probability of 95 %. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CENELEC and/or CEN shall not be held resp
15、onsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 61672-3:2013 was approved by CENELEC as a European Standard without any modification. BS EN 61672-3:2013- 3 - EN 61672-3:2013 Annex ZA (normative) Normative references to internationa
16、l publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the r
17、eferenced document (including any amendments) applies. NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. Publication Year Title EN/HD Year IEC 60942 - Electroacoustics - Sound calibrators EN 60942 - IEC 61094-5 - Measure
18、ment microphones Part 5: Methods for pressure calibration of working standard microphones by comparison EN 61094-5 - IEC 61094-6 - Measurement microphones Part 6: Electrostatic actuators for determination of frequency response EN 61094-6 - IEC 61183 - Electroacoustics - Random-incidence and diffuse-
19、field calibration of sound level meters EN 61183 - IEC 61672-1 - Electroacoustics - Sound level meters Part 1: Specifications EN 61672-1 - IEC 61672-2 - Electroacoustics - Sound level meters Part 2: Pattern evaluation tests EN 61672-2 - IEC 62585 - Electroacoustics - Methods to determine corrections
20、 to obtain the free-field response of a sound level meter EN 62585 - ISO/IEC Guide 98-3 - Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) - - ISO/IEC Guide 99 - International vocabulary of metrology - Basic and general concepts and associated terms
21、 (VIM) - - BS EN 61672-3:2013 2 61672-3 IEC:2013 CONTENTS 1 Scope . 5 2 Normative references 5 3 Submission for testing 6 4 Conformance 6 5 Preliminary inspection . 7 6 Power supply 7 7 Environmental conditions 8 8 General test requirements . 8 9 Sound calibrator . 8 9.1 General . 8 9.2 Information
22、for operation 9 9.3 Information for testing 9 9.4 Calibration of the sound calibrator 9 10 Indication at the calibration check frequency . 9 11 Self-generated noise . 9 11.1 Microphone installed 9 11.2 Microphone replaced by the electrical input-signal device . 10 12 Acoustical signal tests of a fre
23、quency weighting 10 13 Electrical signal tests of frequency weightings . 12 14 Frequency and time weightings at 1 kHz . 13 15 Long-term stability 14 16 Level linearity on the reference level range 14 17 Level linearity including the level range control 14 18 Toneburst response 15 19 C-weighted peak
24、sound level 16 20 Overload indication . 16 21 High-level stability . 17 22 Documentation . 17 BS EN 61672-3:201361672-3 IEC:2013 5 ELECTROACOUSTICS SOUND LEVEL METERS Part 3: Periodic tests 1 Scope This second edition of IEC 61672-3 describes procedures for periodic testing of time-weighting, integr
25、ating-averaging, and integrating sound level meters that were designed to conform to the class 1 or class 2 specifications of the second edition of IEC 61672-1. The aim of the standard is to ensure that periodic testing is performed in a consistent manner by all laboratories. NOTE 1 In this document
26、, references to IEC 61672-1, IEC 61672-2, and IEC 61672-3 refer to the second editions unless stated otherwise. NOTE 2 Procedures for the periodic testing of sound level meters designed to conform to the specifications of IEC 61672-1:2002 were given in IEC 61672-3:2006. The purpose of periodic testi
27、ng is to assure the user that the performance of a sound level meter conforms to the applicable specifications of IEC 61672-1 for a limited set of key tests and for the environmental conditions under which the tests were performed. The extent of the tests in this part of IEC 61672 is deliberately re
28、stricted to the minimum considered necessary for periodic tests. Periodic tests described in this edition of IEC 61672-3 apply to sound level meters for which the manufacturer claims conformance to the specifications of the second edition of IEC 61672-1. Periodic tests described in this part of IEC
29、61672 apply to sound level meters for which the model has been, or has not been, pattern approved by an independent testing organization responsible for pattern approvals in accordance with the test procedures of the second edition of IEC 61672-2. Because of the limited extent of the periodic tests,
30、 if evidence of pattern approval is not publicly available, no general conclusion about conformance to the specifications of IEC 61672-1 can be made, even if the results of the periodic tests conform to all applicable requirements of this edition of IEC 61672-3. 2 Normative references The following
31、documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60942, Electroaco
32、ustics Sound calibrators IEC 61094-5, Measurement microphones Part 5: Methods for pressure calibration of working standard microphones by comparison IEC 61094-6, Measurement microphones Part 6: Electrostatic actuators for determination of frequency response IEC 61183, Electroacoustics Random-inciden
33、ce and diffuse-field calibration of sound level meters BS EN 61672-3:2013 6 61672-3 IEC:2013 IEC 61672-1, Electroacoustics Sound level meters Part 1: Specifications IEC 61672-2, Electroacoustics Sound level meters Part 2: Pattern evaluation tests IEC 62585, Electroacoustics Methods to determine corr
34、ections to obtain the free-field response of a sound level meter ISO/IEC Guide 98-3, Uncertainty of measurement Part 3: Guide to the expression of uncertainty in measurement (GUM:1995) ISO/IEC Guide 99, International vocabulary of metrology Basic and general concepts and associated terms (VIM) 3 Sub
35、mission for testing 3.1 An instruction manual applicable to the model and version of the sound level meter shall be available in order to perform periodic tests of a sound level meter. If an applicable Instruction Manual is not submitted along with the sound level meter, nor available at the laborat
36、ory, nor publicly accessible from the Internet web site of the manufacturer or supplier of the sound level meter, then no periodic tests shall be performed. 3.2 The source for the instruction manual shall be described in the documentation for the periodic tests. 3.3 All items or accessories for the
37、sound level meter that are necessary for periodic testing shall accompany the sound level meter when it is submitted for testing. A device specified in the instruction manual for inserting electrical signals equivalent to signals from the microphone shall also be submitted if requested by the labora
38、tory. 3.4 Periodic tests as described in this part of IEC 61672 shall not be performed unless the markings on the sound level meter are as required by IEC 61672-1 or there is evidence that the sound level meter was originally so marked. The serial number and the model designation shall be visible on
39、 the sound level meter. 3.5 Data required to perform the periodic tests shall be available and the source of the data shall be recorded and reported by the laboratory. The data shall include all relevant information required by IEC 61672-1 and IEC 62585. 3.6 A sound calibrator shall be available. Th
40、e sound calibrator shall be supplied with the sound level meter, if required by the user or if requested by the laboratory, or shall be supplied by the laboratory. If a suitable sound calibrator is supplied by the user, it shall be used by the laboratory to establish the acoustical sensitivity of th
41、e sound level meter. 4 Conformance 4.1 Conformance to a performance specification is demonstrated when the following criteria are both satisfied: (a) a measured deviation from a design goal does not exceed the applicable acceptance limit and (b) the corresponding uncertainty of measurement does not
42、exceed the corresponding maximum-permitted uncertainty of measurement given in IEC 61672-1 for the same coverage probability of 95 %. IEC 61672-1 gives example assessments of conformance using these criteria. 4.2 For laboratories performing periodic tests, the uncertainties associated with all measu
43、rements shall be determined in accordance with the procedures of ISO/IEC Guide 98-3. Metrological terms shall be as defined in ISO/IEC Guide 99. Actual measurement uncertainties shall be calculated for a coverage probability of 95 %. Calculation of the uncertainty of BS EN 61672-3:201361672-3 IEC:20
44、13 7 measurement for a particular test should consider at least the following components, as applicable. Other uncertainty components are noted in Clauses 7, 12, and 13. The uncertainty attributed to calibration of the individual instruments and equipment used to perform the test, including the soun
45、d calibrator and any free-field facility; The uncertainty resulting from environmental effects or adjustments; The uncertainty resulting from small errors that may be present in the applied signals; The uncertainty attributed to effects associated with the repeatability of the results of the measure
46、ments. When a laboratory is only required to make a single measurement, it is necessary for the laboratory to make an estimate of the contribution of random effects to the total uncertainty. The estimate should be determined from an evaluation of several measurement results previously obtained for a
47、 similar sound level meter; The uncertainty associated with the resolution of the display device of the sound level meter under test. For digital display devices that indicate signal levels with a resolution of 0,1 dB, the uncertainty component should be taken as a rectangular distribution with semi
48、-range of 0,05 dB; The uncertainty associated with the device used to mount the sound level meter in the free-field test facility; The uncertainty resulting from the deviation of the sound field in the free-field test facility from an ideal free sound field; and The uncertainty associated with each
49、correction applied to the measurement data. 4.3 If an actual uncertainty of measurement for a test performed by the laboratory exceeds the corresponding maximum-permitted uncertainty, the result of the test shall not be used to evaluate conformance to this part of IEC 61672 for periodic testing. 4.4 A laboratorys actual uncertainty, without inclusion of the uncertainty of the manufacturers free-field or random-incidence correction data, shall not exceed the corresponding maximum-permitted uncertain
