IEC 61672-2-2013 Electroacoustics - Sound level meters - Part 2 Pattern evaluation tests《电声学.声级计.第2部分 型式评定试验》.pdf

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1、 IEC 61672-2 Edition 2.0 2013-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics Sound level meters Part 2: Pattern evaluation tests Electroacoustique Sonomtres Partie 2: Essais dvaluation dun modle IEC61672-2:2013 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Swit

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15、 en ligne. Service Clients - webstore.iec.ch/csc Si vous dsirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csciec.ch. IEC 61672-2 Edition 2.0 2013-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics Sound level meters Part 2: Pattern

16、evaluation tests Electroacoustique Sonomtres Partie 2: Essais dvaluation dun modle INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE W ICS 17.140.50 PRICE CODE CODE PRIX ISBN 978-2-8322-1080-2 Registered trademark of the International Electrotechnical Commission Ma

17、rque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agr. 2 61672-2 IEC:2013 CONTENTS FOREWORD . 4 1 Scope . 6 2 No

18、rmative references . 6 3 Terms and definitions . 7 4 Submission for testing 7 5 Marking of the sound level meter and information in the Instruction Manual 8 6 Mandatory facilities and general requirements 8 7 Environmental, electrostatic, and radio-frequency tests 10 7.1 General . 10 7.2 Uncertainti

19、es for measurements of environmental test conditions 11 7.3 Influence of static pressure . 11 7.4 Limits on air temperature, relative humidity and static pressure . 12 7.5 Acclimatization requirements for tests of the influence of air temperature and relative humidity 12 7.6 Abbreviated test of the

20、combined influence of air temperature and relative humidity 12 7.7 Influence of air temperature . 14 7.8 Influence of relative humidity . 15 7.9 Influence of electrostatic discharges 16 7.10 Influence of a.c. power-frequency and radio-frequency fields. 17 7.10.1 Sound signal . 17 7.10.2 AC power-fre

21、quency tests . 17 7.10.3 Radio-frequency tests 17 8 Radio-frequency emissions and public power supply disturbances 19 9 Electroacoustical performance tests . 20 9.1 General . 20 9.2 Indication at the calibration check frequency . 21 9.3 Directional response 21 9.4 Tests of frequency weightings with

22、acoustical signals 23 9.4.1 General . 23 9.4.2 Windscreen corrections . 24 9.4.3 Free-field tests 24 9.4.4 Comparison coupler tests 25 9.4.5 Conformance . 26 9.4.6 Random incidence . 26 9.5 Tests of frequency weightings with electrical signals . 27 9.5.1 General . 27 9.5.2 First alternative test pro

23、cedure (variable input signal level) 27 9.5.3 Second alternative test procedure (constant input signal level) 27 9.5.4 Conformance . 28 9.5.5 Frequency weightings C or Z at 1 kHz . 28 9.6 Corrections for the effect of reflections from the case of a sound level meter and diffraction around a micropho

24、ne 28 9.7 Corrections to obtain free-field or random-incidence sound levels . 29 9.8 Level linearity 30 9.8.1 Tests at an air temperature near the reference air temperature . 30 9.8.2 Tests at elevated air temperature 31 61672-2 IEC:2013 3 9.9 Under-range indication 31 9.10 Self-generated noise leve

25、l . 31 9.11 Decay time constants for time weightings F and S . 32 9.12 Toneburst response for sound level meters that measure time-weighted sound level 32 9.13 Toneburst response for sound level meters that measure sound exposure level or time-averaged sound level 33 9.14 Response to sequences of re

26、peated tonebursts for sound level meters that measure time-averaged sound level 34 9.15 Overload indication . 34 9.16 C-weighted peak sound level . 35 9.17 Reset 36 9.18 Electrical output 36 9.19 Timing facilities . 36 9.20 Crosstalk in multi-channel sound level meter systems . 36 9.21 Power supply

27、. 36 10 Pattern evaluation report 37 Bibliography 38 4 61672-2 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTROACOUSTICS SOUND LEVEL METERS Part 2: Pattern evaluation tests FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization com

28、prising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, IEC publishes International Sta

29、ndards, Technical Specifications, Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this pre

30、paratory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two organ

31、izations. 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensus of opinion on the relevant subjects since each technical committee has representation from all interested IEC National Committees. 3) IEC Publications have the form

32、of recommendations for international use and are accepted by IEC National Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any misinterpretati

33、on by any end user. 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications transparently to the maximum extent possible in their national and regional publications. Any divergence between any IEC Publication and the corresponding national or regi

34、onal publication shall be clearly indicated in the latter. 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any services carried out

35、by independent certification bodies. 6) All users should ensure that they have the latest edition of this publication. 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and members of its technical committees and IEC National Committees

36、for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention is drawn to the N

37、ormative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held re

38、sponsible for identifying any or all such patent rights. International Standard IEC 61672-2 has been prepared by IEC technical committee 29, Electroacoustics, in cooperation with the International Organization of Legal Metrology (OIML). This second edition cancels and replaces the first edition publ

39、ished in 2003. This second edition constitutes a technical revision. The main technical changes with regard to the previous edition are as follows: In this second edition, conformance to specifications is demonstrated when: a) measured deviations from design goals do not exceed the applicable accept

40、ance limits, and b) the uncertainty of measurement does not exceed the corresponding maximum permitted uncertainty, with both uncertainties determined for a coverage probability of 95 %. 61672-2 IEC:2013 5 The text of this second edition is based on that of the first edition and the following docume

41、nts: FDIS Report on voting 29/813/FDIS 29/824/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of the IEC 61

42、672 series, published under the general title Electroacoustics Sound level meters, can be found on the IEC website. The committee has decided that the contents of this publication will remain unchanged until the stability date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data r

43、elated to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 61672-2 IEC:2013 ELECTROACOUSTICS SOUND LEVEL METERS Part 2: Pattern-evaluation tests 1 Scope This part of IEC 61672 provides details of the tests necessary

44、to verify conformance to all mandatory specifications given in IEC 61672-1 for time-weighting sound level meters, integrating-averaging sound level meters, and integrating sound level meters. Pattern-evaluation tests apply for each channel of a multi-channel sound level meter, as necessary. Tests an

45、d test methods are applicable to class 1 and class 2 sound level meters. The aim is to ensure that all laboratories use consistent methods to perform pattern-evaluation tests. NOTE 1 In this document, references to IEC 61672-1, IEC 61672-2, and IEC 61672-3 refer to the second editions unless stated

46、otherwise. NOTE 2 Procedures for the pattern-evaluation testing of sound level meters designed to conform to the specifications of IEC 61672-1:2002 were given in IEC 61672-2:2003. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are

47、 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, Electroacoustics Sound calibrators IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) Pa

48、rt 4-2: Testing and measurement techniques Electrostatic discharge immunity test IEC 61000-4-3:2010, Electromagnetic compatibility (EMC) Part 4-3: Testing and measurement techniques Radiated, radio-frequency, electromagnetic-field immunity test IEC 61000-4-6:2008, Electromagnetic compatibility (EMC)

49、 Part 4-6: Testing and measurement techniques Immunity to conducted disturbances, induced by radio-frequency fields IEC 61000-6-2:2005, Electromagnetic compatibility (EMC) Part 6-2: Generic standards Immunity for industrial environments IEC 61094-1, Measurement microphones Part 1: Specifications for laboratory standard microphones IEC 61094-5, Measurement microphones Part 5: Methods for pressure calibration of wor