1、 IEC 61672-1 Edition 2.0 2013-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics Sound level meters Part 1: Specifications Electroacoustique Sonomtres Partie 1: Spcifications IEC61672-1:2013 THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2013 IEC, Geneva, Switzerland All rights reser
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15、ts - 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 61672-1 Edition 2.0 2013-09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electroacoustics Sound level meters Part 1: Specifications Electroacoustique
16、 Sonomtres Partie 1: Spcifications INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE XA ICS 17.140.50 PRICE CODE CODE PRIX ISBN 978-2-8322-1087-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique In
17、ternationale 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 61672-1 IEC:2013 CONTENTS FOREWORD . 4 INTRODUCTION . 6 1 Scope . 7 2 Normative references . 8 3 Terms
18、 and definitions . 8 4 Reference environmental conditions . 14 5 Performance specifications . 14 5.1 General . 14 5.2 Adjustments at the calibration check frequency . 17 5.3 Corrections to indicated levels . 17 5.3.1 General . 17 5.3.2 Reflections and diffraction . 17 5.3.3 Windscreens 18 5.3.4 Form
19、at for correction data . 18 5.3.5 Corrections for use during periodic testing . 19 5.4 Directional response 19 5.5 Frequency weightings 20 5.6 Level linearity 23 5.7 Self-generated noise . 24 5.8 Time-weightings F and S . 24 5.9 Toneburst response . 24 5.10 Response to repeated tonebursts 26 5.11 Ov
20、erload indication . 27 5.12 Under-range indication 27 5.13 C-weighted peak sound level . 27 5.14 Stability during continuous operation . 28 5.15 High-level stability . 28 5.16 Reset 29 5.17 Thresholds 29 5.18 Display 29 5.19 Analogue or digital output 29 5.20 Timing facilities . 30 5.21 Radio freque
21、ncy emissions and disturbances to a public power supply 30 5.22 Crosstalk . 31 5.23 Power supply . 31 6 Environmental, electrostatic, and radio-frequency requirements . 32 6.1 General . 32 6.2 Static pressure 32 6.3 Air temperature . 32 6.4 Humidity 33 6.5 Electrostatic discharge 33 6.6 A.C. power-f
22、requency and radio-frequency fields . 33 6.7 Mechanical vibration 34 7 Provision for use with auxiliary devices 35 8 Marking 35 9 Instruction Manual 35 61672-1 IEC:2013 3 9.1 General . 35 9.2 Information for operation . 36 9.2.1 General . 36 9.2.2 Design features . 36 9.2.3 Power supply . 37 9.2.4 A
23、djustments at the calibration check frequency . 37 9.2.5 Corrections to indicated levels . 37 9.2.6 Operating the sound level meter 37 9.2.7 Accessories . 38 9.2.8 Influence of variations in environmental conditions 38 9.3 Information for testing . 39 Annex A (informative) Relationship between toler
24、ance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement 41 Annex B (normative) Maximum-permitted uncertainties of measurement 42 Annex C (informative) Example assessments of conformance to specifications of this standard . 44 Annex D (normative) Frequenc
25、ies at fractional-octave intervals . 47 Annex E (normative) Analytical expressions for frequency-weightings C, A, and Z . 49 Figure 1 Principal steps involved in forming a time-weighted sound level . 10 Figure A.1 Relationship between tolerance interval, corresponding acceptance interval and the max
26、imum-permitted uncertainty of measurement . 41 Figure C.1 Examples of assessment of conformance . 46 Table 1 Acceptance limits for the difference between a measured windscreen correction and the corresponding correction given in the Instruction Manual . 18 Table 2 Acceptance limits for deviations of
27、 directional response from the design goal . 20 Table 3 Frequency weightings and acceptance limits . 22 Table 4 Reference 4 kHz toneburst responses and acceptance limits 25 Table 5 Reference differences for C-weighted peak sound levels and acceptance limits . 28 Table 6 Limits for conducted disturba
28、nce to the voltage of a public supply of electric power . 31 Table B.1 Maximum-permitted uncertainties of measurement for a coverage probability of 95 % 42 Table C.1 Examples of assessment of conformance 45 Table D.1 Frequencies at one-third-octave intervals 47 Table D.2 Frequencies at one-sixth-oct
29、ave intervals 48 Table D.3 Frequencies at one-twelfth-octave intervals . 48 4 61672-1 IEC:2013 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ ELECTROACOUSTICS SOUND LEVEL METERS Part 1: Specifications FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standa
30、rdization comprising 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 Inte
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37、 carried out 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 Nationa
38、l Committees 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 d
39、rawn to the Normative 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 n
40、ot be held responsible for identifying any or all such patent rights. International Standard IEC 61672-1 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
41、 edition published in 2002. This second edition constitutes a technical revision. The main technical changes with respect 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 app
42、licable acceptance 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 %. 61672-1 IEC:2013 5 The text of this second edition is based on that of the first edition and the fo
43、llowing documents: FDIS Report on voting 29/812/FDIS 29/823/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
44、 of the IEC 61672 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“
45、 in the data related to the specific publication. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. 6 61672-1 IEC:2013 INTRODUCTION For assessments of conformance to performance specifications, this second edition of IEC 61672-1 uses different c
46、riteria than were used for the 2002 first edition. In the period from 1961 to 1985, International Standards for sound level meters did not provide any requirements or recommendations to account for the uncertainty of measurement in assessments of conformance to specifications. This absence of requir
47、ements or recommendations to account for uncertainty of measurement created ambiguity in determinations of conformance to specifications for situations where a measured deviation from a design goal was close to a limit of the allowed deviation. If conformance was determined based on whether a measur
48、ed deviation did or did not exceed the limits, the end-user of the sound level meter incurred the risk that the true deviation from a design goal exceeded the limits. To remove this ambiguity, IEC Technical Committee 29, at its meeting in 1996, adopted a policy to account for measurement uncertainty
49、 in assessments of conformance in International Standards that it prepares. The first edition (2002) of IEC 61672-1 accounted for measurement uncertainty by giving two explicit criteria for determining conformance to the specifications. The two criteria were (a) that measured deviations from design goals, extended by the expanded uncertainty of measurement, do not exceed the applicable tolerance limits and (b) that th
