1、 ANSI/ASA S1.4-2014/Part 1 / IEC 61672-1:2013 AMERICAN NATIONAL STANDARD Electroacoustics Sound Level Meters Part 1: Specifications (a nationally adopted international standard) Accredited Standards Committee S1, Acoustics Standards Secretariat Acoustical Society of America 1305 Walt Whitman Road, S
2、uite 300 Melville, NY 11747 ANSI/ASA S1.4-2014/Part 1 /IEC 61672-1:2013The American National Standards Institute, Inc. (ANSI) is the national coordinator of voluntary standards development and the clearinghouse in the U.S.A. for information on national and international standards. The Acoustical Soc
3、iety of America (ASA) is an organization of scientists and engineers formed in 1929 to increase and diffuse the knowledge of acoustics and to promote its practical applications. ANSI/ASA S1.4-2014/Part 1 / IEC 61672-1:2013 (Revision of ANSI S1.4-1983 R2006, ANSI S1.4a-1985 R2006, and ANSI S1.43-1997
4、 R2007) AMERICAN NATIONAL STANDARD Electroacoustics Sound Level Meters Part 1: Specifications (a nationally adopted international standard) Secretariat: Acoustical Society of America Approved on July 21, 2014 by: American National Standards Institute, Inc. Abstract This part of ANSI/ASA S1.4 / IEC 6
5、1672 gives electroacoustical performance specifications for three kinds of sound-measuring instruments: a time-weighting sound level meter that measures exponential-time-weighted, frequency-weighted sound levels; an integrating-averaging sound level meter that measures time-averaged, frequency-weigh
6、ted sound levels; and an integrating sound level meter that measures frequency-weighted sound exposure levels. ii 2014 Acoustical Society of AmericaAll rights reserved 9 Instruction Manual 32 9.1 General . 32 9.2 Information for operation . 32 9.3 Information for testing . 36 Annex A (informative) R
7、elationship between tolerance interval, corresponding acceptance interval and the maximum-permitted uncertainty of measurement . 39 Annex B (normative) Maximum-permitted uncertainties of measurement . 40 Annex C (informative) Example assessments of conformance to specifications of this standard . 42
8、 Annex D (normative) Frequencies at fractional-octave intervals . 45 Annex E (normative) Analytical expressions for frequency-weightings C, A, and Z 47 Annex F (informative) Additional information for U.S. users regarding low-frequency tolerances in this standard vs. previous versions of ANSI S1.4 .
9、 49 Tables Table 1 Acceptance limits for the difference between a measured windscreen correction and the corresponding correction given in the Instruction Manual . 14 Table 2 Acceptance limits for deviations of directional response from the design goal 16 Table 3 Frequency weightings and acceptance
10、limits . 17 Table 4 Reference 4 kHz toneburst responses and acceptance limits 21 Table 5 Reference differences for C-weighted peak sound levels and acceptance limits 24 Table 6 Limits for conducted disturbance to the voltage of a public supply of electric power . 27 Table B.1 Maximum-permitted uncer
11、tainties of measurement for a coverage probability of 95 % . 40 Table C.1 Examples of assessment of conformance 43 Table D.1 Frequencies at one-third-octave intervals . 45 Table D.2 Frequencies at one-sixth-octave intervals . 46 Table D.3 Frequencies at one-twelfth-octave intervals 46 Table F.1 Freq
12、uency response tolerance limits in ANSI S1.4-1983 50 Figures Figure 1 Principal steps involved in forming a time-weighted sound level 4 2014 Acoustical Society of AmericaAll rights reserved iii Figure A.1 Relationship between tolerance interval, corresponding acceptance interval and the maximum-perm
13、itted uncertainty of measurement . 39 Figure C.1 Examples of assessment of conformance . 44 iv 2014 Acoustical Society of AmericaAll rights reserved Foreword This Foreword is for information only and is not a part of the American National Standard ANSI/ASA S1.4-2014/Part 1 / IEC 61672-1:2013 America
14、n National Standard Electroacoustics Sound level meters Part 1: Specifications. As such, this Foreword may contain material that has not been subjected to public review or a consensus process. In addition, it does not contain requirements necessary for conformance to the standard. This standard comp
15、rises a part of a group of definitions, standards, and specifications for use in acoustics. It was developed and approved by Accredited Standards Committee S1 Acoustics, under its approved operating procedures. Those procedures have been accredited by the American National Standards Institute (ANSI)
16、. The Scope of Accredited Standards Committee S1 is as follows: Standards, specifications, methods of measurement and test, and terminology in the field of physical acoustics, including architectural acoustics, electroacoustics, sonics and ultrasonics, and underwater sound, but excluding those aspec
17、ts which pertain to biological safety, tolerances, and comfort. This nationally adopted international standard is a revision of ANSI S1.4-1983 (R 2006), ANSI S1.4A-1985 (R 2006), and ANSI S1.43-1997 (R 2007), which have been technically revised. This standard is identical to IEC 61672-1:2013, which
18、was prepared by IEC Technical Committee 29, in cooperation with the International Organization of Legal Metrology (OIML). However, in conformance with ANSI and IEC rules, the words “this part of ANSI/ASA S1.4 / IEC 61672” replace the words “this part of IEC 61672” where they appear in the IEC docume
19、nt, decimal points were substituted in place of the decimal commas used in IEC documents, and American English spelling is used in place of British English spelling. An informational annex is also included that is not found in IEC 61672/Part 1. In accordance with clause A.1 b) of ANSI Procedures for
20、 the National Adoption of ISO and IEC Standards as American National Standards, a standard will still be considered identical if it includes “any regional or national informative material (e.g. informative annexes that do not alter, add to or delete from the provision of the ISO or IEC standard); ex
21、amples of informative material are advice to users, training guidance or suggested forms or reports.” This standard includes six Annexes. Annexes B, D and E are normative and are considered to be a part of this standard. Annexes A and C are informative and are not considered part of this standard. A
22、nnex F is additional, totally informative material for U.S. users and is shown in bold, blue text within a blue border. The ANSI/ASA equivalents for the IEC standards in the IEC 61672 series are given below: ANSI/ASA S1.4-2014/Part 1 / IEC 61672-1:2013 is an identical national adoption of IEC 61672-
23、1:2013. ANSI/ASA S1.4-2014/Part 2 / IEC 61672-2:2013 is an identical national adoption of IEC 61672-2:2013. ANSI/ASA S1.4-2014/Part 3 / IEC 61672-3:2013 is an identical national adoption of IEC 61672-3:2013. 2014 Acoustical Society of AmericaAll rights reserved v At the time this Standard was submit
24、ted to Accredited Standards Committee S1, Acoustics for approval, the membership was as follows: R.J. Peppin, Chair A. Scharine, Vice-Chair S.B. Blaeser, Secretary 3M Personal Safety Division, Detection Solutions . P.J. Battenberg M. Wurm (Alt.) Acoustical Society of America . R.J. Peppin Air-Condit
25、ioning, Heating and Refrigeration Institute S.J. Lind D. Abbate (Alt.) American Industrial Hygiene Association D. Driscoll D. Sandfort (Alt.) Campanella Associates A.J. Campanella Casella USA R. Brauch ETS-Lindgren Acoustic Systems D. Winker M. Black (Alt.) G.R.A.S. Sound FAX: 631-923-2875; E-mail:
26、asastdsacousticalsociety.org. 2014 Acoustical Society of AmericaAll rights reserved vii Introduction U.S. NOTE: The following introductory text describes the differences between the current version of IEC 61672-1 and the 2002 version; it does NOT present the differences between this version and the
27、previous version of ANSI S1.4-1983, ANSI S1.4A-1985, or ANSI S1.43-1997. For assessments of conformance to performance specifications, this second edition of IEC 61672-1 uses different criteria than were used for the 2002 first edition. In the period from 1961 to 1985, International Standards for so
28、und 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 requirements or recommendations to account for uncertainty of measurement created ambiguity in determinations of conform
29、ance 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 measured deviation did or did not exceed the limits, the end-user of the sound level meter incurred the risk that the tr
30、ue 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 in assessments of conformance in International Standards that it prepares. The first edition (2002) of IEC 61672-
31、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)
32、that the expanded uncertainty of measurement does not exceed agreed-upon maximum values. For most performance specifications, the tolerance limits were calculated essentially by extending the allowances for design and manufacturing from the 1979 and 1985 International Standards for sound level meter
33、s by the applicable maximum-permitted expanded uncertainties of measurement. Tolerance limits were intended to represent the limits for true deviations from design goals with a coverage probability of 95 %. This second edition of IEC 61672-1 uses an amended criterion for assessing conformance to a s
34、pecification. Conformance is demonstrated when (a) measured deviations from design goals do not exceed the applicable acceptance limits and (b) the uncertainty of measurement does not exceed the corresponding maximum-permitted uncertainty. Acceptance limits are analogous to the allowances for design
35、 and manufacturing implied in the first edition (2002) of IEC 61672-1. Actual and maximum-permitted uncertainties are determined for a coverage probability of 95 %. The amended criterion for assessing conformance does not necessitate any change to the design of a sound level meter in order to confor
36、m to the specifications of this International Standard. The maximum-permitted uncertainties of measurement are not equivalent to the uncertainties associated with the measurement of a sound level. The uncertainty of a measured sound level is evaluated from the anticipated deviations of the electroac
37、oustical performance of the sound level meter from the relevant design goals as well as estimates of the uncertainties associated with the specific measurement situation. Unless more-specific information is available, the evaluation of the contribution of a specific sound level meter to a total meas
38、urement uncertainty can be based on the acceptance limits and maximum-permitted uncertainties specified in this standard. AMERICAN NATIONAL STANDARD ANSI/ASA S1.4-2014/Part 1 / IEC 61672-1:2013 2014 Acoustical Society of AmericaAll rights reserved 1 American National Standard Electroacoustics Sound
39、level meters Part 1: Specifications 1 Scope This part of ANSI/ASA S1.4 / IEC 61672 gives electroacoustical performance specifications for three kinds of sound measuring instruments: a time-weighting sound level meter that measures exponential-time-weighted, frequency-weighted sound levels; an integr
40、ating-averaging sound level meter that measures time-averaged, frequency-weighted sound levels; and an integrating sound level meter that measures frequency-weighted sound exposure levels. Sound level meters conforming to the requirements of this standard have a specified frequency response for soun
41、d incident on the microphone from one principal direction in an acoustic free field or successively from random directions. Sound level meters specified in this standard are intended to measure sounds generally in the range of human hearing. NOTE The AU frequency weighting specified in IEC 61012 can
42、 be applied for measurements of A-weighted sound levels of audible sound in the presence of a source that contains spectral components at frequencies greater than 20 kHz.1Two performance categories, class 1 and class 2, are specified in this standard. In general, specifications for class 1 and class
43、 2 sound level meters have the same design goals and differ mainly in the acceptance limits and the range of operational temperature. Acceptance limits for class 2 are greater than, or equal to, those for class 1. This standard is applicable to a range of designs for sound level meters. A sound leve
44、l meter may be a self-contained hand-held instrument with an attached microphone and a built-in display device. A sound level meter may be comprised of separate components in one or more enclosures and may be capable of displaying a variety of acoustical signal levels. Sound level meters may include
45、 extensive analogue or digital signal processing, separately or in combination, with multiple analogue and digital outputs. Sound level meters may include general-purpose computers, recorders, printers, and other devices that form a necessary part of the complete instrument. _ 1IEC 61012, Filters fo
46、r the measurement of audible sound in the presence of ultrasound. ANSI/ASA S1.4-2014/Part 1 / IEC 61672-1:2013 2 2014 Acoustical Society of AmericaAll rights reserved Sound level meters may be designed for use with an operator present or for automatic and continuous measurements of sound level witho
47、ut an operator present. Specifications in this standard for the response to sound waves apply without an operator present in the sound field. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. Fo
48、r 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) Part 4-2: Testing and measurement techni
49、ques Electrostatic discharge immunity test IEC 61000-6-2:2005, Electromagnetic compatibility (EMC) Part 6-2: Generic standards Immunity for industrial environments IEC 61094-6, Measurement microphones Part 6: Electrostatic actuators for determination of frequency response IEC 61183, Electroacoustics Random-incidence and diffuse-field calibration of sound level meters IEC 62585, Electroacoustics Methods to determine corrections to obtain the free-field response of a sound level met
