1、BRITISH STANDARD BS EN 61252:1997 IEC 61252:1993 BS 6402:1994 renumbered, incorporating Amendments Nos. 1 and 2 Electroacoustics Specifications for personal sound exposure meters The European Standard EN 61252:1997, with the incorporation of amendment A1:2001, has the status of a British Standard. I
2、CS 17.140.50 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 61252:1997 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 o
3、n 15 January 1994 BSI 06 September 2001 First published August 1983 Second edition January 1994 The following BSI references relate to the work on this standard: Committee reference EEL/24 Draft for comment 90/22427 DC ISBN 0 580 22921 1 Committees responsible for this British Standard The preparati
4、on of this British Standard was entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technical Committee EEL/24, upon which the following bodies were represented: British Association of Otolaryngologists British Hearing Aid Industry Association British Hearing Aid Manufacturer
5、s Association British Medical Association British Society of Audiology British Telecommunications plc Confederation of British Industry Department of Health Department of Trade and Industry (National Physical Laboratory) Health and Safety Executive Institute of Acoustics Institute of Sound and Vibra
6、tion Research Institution of Electrical Engineers Medical Research Council Ministry of Defence National Health Services Royal Aeronautical Society Royal National Institute for Deaf People Society of Environmental Engineers University of Exeter Amendments issued since publication Amd. No. Date Commen
7、ts 9323 January 1997 Addition of Annex ZA 13116 06 September 2001 See national forewordBS EN 61252:1997 BSI 06 September 2001 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Introduction 2 1S c o p e 3 2 Normative references 3 3 Definitions 4 4 General perfo
8、rmance requirements 5 5 Reference conditions 7 6 Absolute acoustical sensitivity 7 7 Frequency weighting 8 8 Linearity of response to steady signals 8 9 Response to short-duration signals 9 10 Response to unipolar pulses 9 11 Latching overload indicator 9 12 Sensitivity to various environments 9 13
9、Instrument marking 10 14 Instruction manual 11 15Electromagnetic and electrostatic compatibility requirements and test procedures 12 Annex A (informative) Sound exposures and corresponding normalized 8-h-average sound levels 16 Annex B (informative) Recommended tests to verify the performance of a p
10、ersonal sound exposure meter 17 Annex C Emission limits 20 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 21 Figure 1 Functional elements of a personal sound exposure meter 6 Table 1 Design-goal A-frequency weig
11、hting relative to response at 1 kHz and the tolerances A that apply to the performance of a complete personal sound exposure meter 7 Table A.1 Sound exposures and corresponding normalized 8-h-average sound levels 16 Table B.1 Minimum set of target conditions for 1 kHz steady-signal linearity tests 1
12、7 Table B.2 Conditions for testing response to short-duration signals 19BS EN 61252:1997 ii BSI 06 September 2001 National foreword This British Standard has been prepared by Technical Committee EPL/29 (formerly EEL/24) and is the English language version of EN 61252:1995 Electroacoustics Specificat
13、ions for personal sound exposure meters including amendment A1:2001, published by the European Committee for Electrotechnical Standardization (CENELEC). This British Standard supersedes BS 6402:1993, which is withdrawn. The start and finish of text introduced or altered by amendment is indicated in
14、the text by tags . Tags indicating changes to IEC text carry the number of the IEC amendment. For example, text altered by IEC amendment 1 is indicated by . Specifications in this standard for personal sound exposure meters are consistent, insofar as is practical, with comparable specifications in B
15、S 6698:1986 for integrating-averaging sound level meters. The four principle technical differences from the specifications in BS 6698:1986 are as follows. a) Sound exposure is measured and displayed rather than equivalent-continuous frequency-weighted sound pressure level or sound exposure level. b)
16、 Accuracy of squaring and intergrating short-duration signals is specified by measurement of the sound exposure of a sequence of repeated constant-amplitude, 1 ms and 10 ms duration, 4 kHz tonebursts rather than by measurement of the response to single 4 kHz tonebursts of varying amplitudes with dur
17、ations ranging from 1 ms to 1 s, each single toneburst being accompanied by a continuous, in-phase, low-level, 4 kHz background signal. c) Specifications for a personal sound exposure meter include a limitation on the difference between the sound exposure indicated in response to positive-going and
18、negative-going unipolar pulses. d) Requirements are not specified for the directional response of the microphone of a personal sound exposure meter intended to be worn on a person. This standard includes two informative annexes. Annex A provides a table of selected sound exposures and corresponding
19、normalized 8-h-average sound levels. Annex B describes recommendation for tests to verify the performance of a personal sound exposure meter. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a peri
20、od of time during the change over from one numbering system to the other, publications may contain identifiers from both systems. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue und
21、er the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct a
22、pplication. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to ii, the EN title page, pages 2 to 21 and a back cover. The BSI copyright notice displayed in this docume
23、nt indicates when the document was last issued.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61252 March 1995 + A1 January 2001 ICS 17.140.50 Descriptors: Electroacoustic equipment, exposure meters, sound pressure, definitions, indicating instruments, specifications, characteristics, instrume
24、nt sensitivity, marking, technical notices English version Electroacoustics Specifications for personal sound exposure meters (includes amendment A1:2001) (IEC 61252:1993 + A1:2000) Electroacoustique Spcifications des exposimtres acoustiques individuels (inclut lamendement A1:2001) (CEI 61252:1993 +
25、 A1:2000) Elektroakustik Anforderungen an Personenschallexposimeter (enthlt nderung A1:2001) (IEC 61252:1993 + A1:2000) This European Standard was approved by CENELEC on1995-03-06. Amendment A1 was approved by CENELEC on 2000-11-01. CENELEC members are bound to comply with the CEN/CENELEC Internal R
26、egulations 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.
27、 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 me
28、mbers 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 Comit
29、Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1995 Copyright reserved to CENELEC members Ref. No. EN 61252:1995 + A1:2001 EEN 61252:1995 BSI 06 September 2001 2 Foreword The text of the Internationa
30、l Standard IEC 1252:1993, prepared by IEC TC 29, Electroacoustics, was submitted to the formal vote and was approved by CENELEC as EN 61252 on 1995-03-06 without any modification. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. Annexes designated
31、“informative” are given for information only. In this standard, Annex ZA is normative and Annex A and Annex B are informative. Annex ZA has been added by CENELEC. Foreword to amendment A1 The text of the document 29/457/FDIS, future amendment 1 to IEC 61252:1993, prepared by IEC TC 29, Electroacoust
32、ics, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as amendment A1 EN 61252 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 standa
33、rd, Annex ZA is normative and Annex A and Annex B are informative. Annex ZA has been added by CENELEC. Introduction According to this International Standard, a personal sound exposure meter is intended to measure sound exposure as the time integral of the square of the instantaneous A-frequency-weig
34、hted sound pressure. This operating principle underlies the measurement of sound exposure level according to IEC 804. It is the “equal-energy exchange rate” whereby a doubling (or halving) of the integration time of a constant sound level yields a two-fold increase (or decrease) of sound exposure. S
35、imilarly, an increase (or decrease) of 3 dB in a constant input sound level for a constant integration time yields a doubling (or halving) of the sound exposure. Noise dose meters usually have been designed to indicate noise dose as a percentage of a legal limit. The limit and its definition vary fr
36、om country to country and are subject to change. To facilitate international comparison of sound exposure records with numerical values of convenient magnitude, this International Standard specifies an instrument that indicates sound exposure in pascal-squared hours. An indication of sound exposure
37、with a unit other than pascal-squared hours is permitted provided the manufacturer specifies a procedure for converting the indication to pascal-squared hours, for example, a display of “dose” as a fraction or a percentage of a specified sound exposure in pascal-squared hours. The principal applicat
38、ion for a personal sound exposure meter is the measurement of sound exposure in the vicinity of a persons head; e.g., for assessment of potential hearing impairment according to Standards such as ISO 1999. The microphone of a personal sound exposure meter may be worn on the shoulder, collar, or othe
39、r location close to one ear. For many practical situations, such as in a factory where the sound-incidence angle may vary widely during the course of workday, the sound exposure indicated by an instrument worn on a person is likely to be different from that which would be measured in the absence of
40、the person. The influence of the person wearing a personal sound exposure meter should be considered when estimating the sound exposure that would have been measured with the person absent. latest date by which the EN has to be implemented at national level by publication of an identical national st
41、andard or by endorsement (dop) 1995-12-15 latest date by which the national standards conflicting with the EN have to be withdrawn (dow)1995-12-15 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-
42、08-01 latest date by which the national standards conflicting with the amendment have to be withdrawn (dow)2003-11-01EN 61252:1995 BSI 06 September 2001 3 1 Scope 1.1 Sound exposure is a physical measure that accounts for both the sound pressure and its duration, at a given location, through an inte
43、gral-over-time of the square of instantaneous frequency-weighted sound pressure. 1.2 This International Standard is applicable to instruments for measurement of A-frequency-weighted sound exposure resulting from steady, intermittent, fluctuating, irregular, or impulsive sounds. Instruments complying
44、 with the specifications of this International Standard are intended to be worn on a person to measure sound exposure. Measurements of sound exposure in the workplace may be useful for determinations of occupational noise exposure, in accordance with ISO 1999 and ISO 9612. 1.3 This International Sta
45、ndard specifies acoustical and electrical performance requirements for personal sound exposure meters of one accuracy grade. The accuracy grade corresponds to that for an integrating sound level meter which complies with the Type 2 requirements of IEC 804 for an A-weighted sound pressure level range
46、 from 80 dB to 130 dB and a nominal frequency range from 63 Hz to 8 kHz. 1.4 Tolerances on deviations of an instruments performance from specified design goals represent the performance capabilities of practical instruments. Personal sound exposure meters are required to operate within the tolerance
47、s of this International Standard over specified ranges of environmental conditions. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indica
48、ted were valid. All normative documents are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents listed below. Members of IEC and ISO maintain registers of cur
49、rently valid normative documents. IEC 60050(801):1984, Advance edition of the International Electrotechnical Vocabulary, Chapter 801, Acoustics and electroacoustics IEC 60651:1979, Sound level meters IEC 60801-2:1984, Electromagnetic compatibility for industrial-process measurement and control equipment Part 2: Electrostatic discharge requirements IEC 60801-3:1984, Electromagnetic compatibility for industrial-process measurement and control equipment Part 3: Radiated electromagnetic field requirements IEC 60804:1985, Integr
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