《BS-EN-61183-1995 IEC-61183-1994.pdf》由会员分享，可在线阅读，更多相关《BS-EN-61183-1995 IEC-61183-1994.pdf（22页珍藏版）》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 61183:1995 IEC 1183:1994 Electroacoustics Random-incidence and diffuse-field calibration of sound level meters The European Standard EN 61183:1994 has the status of a British Standard UDC 621.396:534.86:534.84:534.6.08 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 03:
2、49:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61183:1995 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 November 1995 BSI 10-1999 The following BSI ref
3、erences relate to the work on this standard: Committee reference EPL/29 Draft for comment 90/22425 DC ISBN 0 580 24578 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee EPL/29, Electroacoustics, upon which the following b
4、odies were represented: British Association of Otolaryngologists British Hearing Aid Industry 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
5、 Laboratory) Health and Safety Executive Institute of Acoustics Institute of Sound and Vibration Research Institution of Electrical Engineers Medical Research Council Ministry of Defence Royal Aeronautical Society Royal National Institute for Deaf people Society of Environmental Engineers University
6、 of Exeter Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 03:49:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61183:1995 BSI 10-1999i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN
7、 611833 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 03:49:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 61183:1995 ii BSI 10-1999 National foreword This British Standard has been prepared by Technical Committee EPL/29 and is the English language v
8、ersion of EN 61183:1994, Electroacoustics Random-incidence and diffuse-field calibration of sound level meters, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 1183:1994 published by the International Electrotechnical Commission (IEC). A B
9、ritish Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references Publication referred toCorr
10、esponding British Standard IEC 50(801):1994BS 4727 Glossary of electrotechnical, power, telecommunication, electronics, lighting and colour terms Part 3 Terms particular to telecommunications and electronics Group 08:1995 Acoustics and electroacoustics EN 60651:1994BS EN 60651:1994 Sound level meter
11、s (IEC 651:1979) EN 60804:1994BS EN 60804:1994a Specification for integrating-averaging sound level meters(IEC 804:1985) EN 61094-1:1994BS EN 61094 Measurement microphones (IEC 1094-1:1992)Part 1:1995 Specifications for laboratory standard microphones a Formerly BS 6698:1986. Summary of pages This d
12、ocument comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 16, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside f
13、ront cover. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 03:49:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 61183 August 1994 UDC 621.396:534.86:534.84:534.6.08 Descriptors: Acoustic measuring instruments, sound level meters, calibratio
14、n, measurements, sound pressure, instrument sensitivity, testing conditions English version Electroacoustics Random-incidence and diffuse-field calibration of sound level meters (IEC 1183:1994) Electroacoustique Etalonnage des sonomtres sous incidence alatoire et en champ diffus (CEI 1183:1994) Elek
15、troakustik Kalibrierung von Schallpegelmessern in einem Schallfeld mit stochastischem Schalleinfall und im diffusen Schallfeld (IEC 1183:1994) This European Standard was approved by CENELEC on 1994-03-08. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate t
16、he 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. This European Standard exis
17、ts 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 members are the national elect
18、rotechnical 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 Europen de Normalisation Ele
19、ctrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1994 Copyright reserved to CENELEC members Ref. No. EN 61183:1994 E Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 03:49:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61
20、183:1994 BSI 10-1999 2 Foreword The text of document 29(CO)167, as prepared by IEC Technical Committee 29, Electroacoustics, was submitted to the IEC-CENELEC parallel vote in July 1993. The reference document was approved by CENELEC as EN 61183 on 8 March 1994. The following dates were fixed: Annexe
21、s designated “normative” are part of the body of the standard. Annexes designated “informative” are given only for information. In this standard, Annex A and Annex B are informative and Annex ZA is normative. Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Calibration method ba
22、sed on free-field measurements4 5Calibration method based on diffuse-field measurements7 Annex A (informative) Practical calibration method based on free-field measurements8 Annex B (informative) Practical calibration method based on diffuse-field measurements12 Annex ZA (normative) Other internatio
23、nal publications quoted in this standard with the references of the relevant European publications15 Figure 1 Reference coordinate system for random-incidence sensitivity level calibration based on free-field measurements5 Figure 2 Reference coordinate system for the purpose of practical measurement
24、 of random-incidence sensitivity level based on free-field measurements6 Figure A.1 A sound level meter located with its microphone at the centre of a sphere and a reference direction for sound incidence aligned with the X-axis8 Figure A.2 A sound level meter under test mounted on a turntable to obt
25、ain incidence of sound from different directions in the X-Y plane9 Figure A.3 Method of simulating rotation in the X-Z plane by 90 rotation of the sound level meter under test around an axis coincident with the reference direction, and then rotation around a circle in the X-Y plane as in Figure A.29
26、 Table A.1 Adjustment factors K(8) for calculation of random-incidence sensitivity level with % = /2 radians (90)10 Table B.1 Characteristics of a type LS2aP/LS2F microphone14 latest date of publication of an identical national standard(dop) 1995-07-01 latest date of withdrawal of conflicting nation
27、al standards(dow) 1995-07-01 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 03:49:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61183:1994 BSI 10-19993 1 Scope 1.1 This International Standard describes a free-field calibration method for determining random-incidence sensitivity levels of
28、sound level meters. Additionally, the standard describes a diffuse-field calibration method for determining diffuse-field sensitivity levels. 1.2 For the purpose of this International Standard, diffuse-field sensitivity level may be used interchangeably with random-incidence sensitivity level. Selec
29、tion of calibration method depends on the facility available. 1.3 Results of calibrations conducted in accordance with this standard depend upon which components of a sound level meter are exposed to the sound field. 1.4 For the purpose of this standard, a sound level meter is considered to be a con
30、ventional sound level meter, an integrating-averaging sound level meter, or any other sound measuring system. 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 public
31、ation, the editions indicated 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 normative documents indicated below. Members of IEC and ISO
32、maintain registers of currently valid International Standards. IEC 50(801):1992, International Electrotechnical Vocabulary (IEV), Chapter 801: Acoustics and electroacoustics. IEC 651:1979, Sound level meters. IEC 804:1985, Integrating-averaging sound level meters. IEC 1094-1:1992, Measurement microp
33、hones Part 1: Specifications for laboratory standard microphones. IEC 1260:199X, Electroacoustics Octave-band and fractional octave-band filters (in preparation). ISO 266:1975, Acoustics Preferred frequencies for measurements (revision in preparation). ISO 3741:1988, Acoustics Determination of sound
34、 power levels of noise sources Precision methods for broad-band sources in reverberation rooms. ISO 3745:1977, Acoustics Determination of sound power levels of noise sources Precision methods for anechoic and semi-anechoic rooms. 3 Definitions 3.1 For the definitions of terms used in this Internatio
35、nal Standard, reference should be made to IEC 50(801). Certain additional terms are defined below for the purpose of this standard. 3.2 reference direction the direction of sound incidence specified by the manufacturer for testing the free-field sensitivity level and directional characteristics of a
36、 sound level meter 3.3 random incidence sound field at a given location and for a given frequency or frequency band centered on that frequency, a sound field consisting of free sound waves arriving successively from all directions with equal probability and level 3.4 diffuse sound field at a given l
37、ocation and for a given frequency or frequency band centred on that frequency, a sound field consisting of sound waves arriving more or less simultaneously from all directions with equal probability and level Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 03:49:31 GMT+00:00 2006, Uncontrolle
38、d Copy, (c) BSI EN 61183:1994 4 BSI 10-1999 3.5 random-incidence sensitivity level in decibels, of a sound level meter, for a given frequency or frequency band centred on that frequency, the time-average sound pressure level indicated by the instrument due to a random incidence sound field, minus th
39、e time-average sound pressure level at the position of the acoustical centre of the microphone, due to sound waves from the same sound source and in the absence of the instrument 3.6 diffuse-field sensitivity level in decibels, of a sound level meter, for a given frequency or frequency band centred
40、on that frequency, the time-average sound pressure level indicated by the instrument due to a diffuse sound field minus the time-average sound pressure level of the sound field at the position of the acoustical centre of the microphone and in the absence of the instrument 3.7 free-field sensitivity
41、level in decibels, of a sound level meter, for a given frequency or frequency band centred on that frequency, the sound pressure level indicated by the instrument due to a free sound-field incident from a specified direction minus the sound pressure level of the sound field at the position of the ac
42、oustical centre of the microphone and in the absence of the instrument 3.8 pressure sensitivity level in decibels, of a sound level meter, for a given frequency or frequency band centred on that frequency, the sound pressure level indicated by the instrument due to a sound pressure uniformly applied
43、 over the surface of the diaphragm of the microphone minus the actual sound pressure level at the diaphragm 4 Calibration method based on free-field measurements 4.1 For each frequency or frequency band centred on that frequency, the random-incidence sensitivity level GRI of a sound level meter shal
44、l be calculated, in decibels, from 4.2 While GF = Lrd Lo will usually vary for individual sound level meters, the directivity factor * depends only on dimensions and geometry and is therefore the same for all instruments of the same model. 4.3 For determination of the directivity factor *, consider
45、the sound level meter located with the acoustical centre of the microphone at the origin of a reference coordinate system. The reference direction of the sound level meter coincides with the X-axis of the coordinate system. Sounds from different directions are incident on the sound level meter from
46、a sound source located at a position on the surface of the sphere defined by a vector r from the origin; see Figure 1. 4.4 The directivity factor * is calculated from the following equation: GRI = GF 10 lg *(1) where *is the directivity factor of the sound level meter and is a measure of the deviati
47、on from an ideal omni-directional response with equal sensitivity at all possible angles of sound incidence on the microphone; GFis the free-field sensitivity level, in decibels, of the sound level meter for the reference direction of sound incidence and equal to Lrd Lo; and where Lrdis the sound pr
48、essure level, in decibels, indicated by the sound level meter when exposed to a plane progressive sound wave arriving at the microphone from the reference direction of sound incidence; Lois the sound pressure level, in decibels, of the same plane progressive sound wave in the absence of the sound le
49、vel meter. (2) Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 03:49:31 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 61183:1994 BSI 10-19995 The integral is taken over all possible angles of incidence from locations over the surface of the surrounding sphere. 4.5 For the purpose of practical measurements, it is convenient to describe the position of the sound source by means of a sound incidence angle 8, measured from the X-axis, and an angle ! measured in a plane perpendicular to the X-axis as shown in Figure