1、BRITISH STANDARD BS EN 60942:2003 Electroacoustics Sound calibrators The European Standard EN 60942:2003 has the status of a British Standard ICS 17.140.50 BS EN 60942:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 10 July 2003 BSI 10 J
2、uly 2003 ISBN 0 580 42229 1 National foreword This British Standard is the official English language version of EN 60942:2003. It is identical with IEC 60942:2003. It supersedes BS EN 60942:1998 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee EPL/29,
3、Electroacoustics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Cat
4、alogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for their
5、 correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interest
6、s informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 90, an inside back cover and a back cover. The BSI copyright date displayed in this document
7、 indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsEUROPEAN STANDARD EN 60942 NORME EUROPENNE EUROPISCHE NORM May 2003 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komi
8、tee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60942:2003 E ICS 17.140.50 Supersedes EN 60942:1998 + A1:2001English version Electroa
9、coustics Sound calibrators (IEC 60942:2003) Electroacoustique Calibreurs acoustiques (CEI 60942:2003) Elektroakustik Schallkalibratoren (IEC 60942:2003) This European Standard was approved by CENELEC on 2003-04-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which s
10、tipulate 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. This European Sta
11、ndard 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 members are the nati
12、onal electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 29/528/FDIS, fut
13、ure edition 3 of IEC 60942, prepared by IEC TC 29, Electroacoustics, in cooperation with the International Organization of Legal Metrology (OIML), was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60942 on 2003-04-01. This European Standard supersedes EN 60942:1998 + A
14、1:2001. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2004-01-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2006-04-01 An
15、nexes designated “normative“ are part of the body of the standard. In this standard, annexes A, B, C and ZA are normative. Annex ZA has been added by CENELEC. The most significant changes from the previous edition are: the inclusion of maximum permitted uncertainties of measurement within the tolera
16、nce limits; the inclusion of a normative annex giving the format for reporting results of pattern evaluation tests; changes to the class designations; specification of the type designation of the microphone to be used to determine the class; harmonization of the range of operating environmental cond
17、itions with those for sound level meters. Specifications for equivalent free-field and diffuse-field levels have been removed. _ Endorsement notice The text of the International Standard IEC 60942:2003 was approved by CENELEC as a European Standard without any modification. In the official version,
18、for Bibliography, the following note has to be added for the standard indicated: IEC 61000-6-2 NOTE Harmonized as EN 61000-6-2:2001 (modified). _ Page2 EN60942:2003 CONTENTS INTRODUCTION.4 1 Scope.5 2 Normative references5 3 Terms and definitions .6 4 Reference environmental conditions8 5 Requiremen
19、ts.8 5.1 General.8 5.2 Sound pressure level .10 5.3 Frequency.11 5.4 Influence of static pressure, air temperature and humidity12 5.5 Total distortion.14 5.6 Power supply requirements14 5.7 Specification and calibration of microphones14 5.8 Electromagnetic compatibility.15 6 Instrument marking and d
20、ocumentation.16 6.1 Marking of the sound calibrator16 6.2 Individual calibration chart for a class LS sound calibrator17 6.3 Instruction manual.17 Annex A (normative) Pattern evaluation tests .19 A.0 Introduction19 A.1 Submission for test 20 A.2 Principal values20 A.3 Marking of the sound calibrator
21、 and supplied documentation 20 A.4 Performance tests at and around reference environmental conditions.20 A.5 Environmental tests .26 A.6 Electromagnetic compatibility.34 Annex B (normative) Periodic tests.38 B.0 Introduction38 B.1 Submission for test 38 B.2 Preliminary inspection 39 B.3 Performance
22、tests39 B.4 Calibration of the sound calibrator with other models of microphone .42 B.5 Documentation.42 Annex C (normative) Format for the pattern evaluation report .44 C.0 Introduction44 C.1 Marking44 C.2 Submission for test 44 C.3 Pattern evaluation report45 Annex ZA (normative) Normative referen
23、ces to international publications with their corresponding European publications 88 Bibliography90 Page3 EN60942:20033002:CEI 24906 4 INTRODUCTION Sound calibrators are designed to produce one or more known sound pressure levels at one or more specified frequencies when coupled to specified models o
24、f microphone in specified configurations, for example, with or without protective grid. The sound pressure level generated by a sound calibrator may depend on environmental conditions such as static pressure, air temperature and relative humidity. Sound calibrators have two principal applications: a
25、) the determination of the electroacoustical pressure sensitivity of specified models of microphone in specified configurations; b) checking or adjusting the overall sensitivity of acoustical measuring devices or systems. Page4 EN60942:20033002:CEI 24906 5 ELECTROACOUSTICS SOUND CALIBRATORS 1 Scope
26、This International Standard specifies the performance requirements for three classes of sound calibrator: laboratory standard (class LS), class 1 and class 2. Tolerance limits are smallest for class LS and greatest for class 2 instruments. Class LS sound calibrators are normally used only in the lab
27、oratory; class 1 and class 2 are considered as sound calibrators for field use. A class 1 sound calibrator is primarily intended for use with a class 1 sound level meter and a class 2 sound calibrator primarily with a class 2 sound level meter, as specified in IEC 61672-1. The tolerance limits for c
28、lass LS sound calibrators are based on the use of a laboratory standard microphone, as specified in IEC 61094-1, for demonstrations of conformance to the requirements of this standard. The tolerance limits for class 1 and class 2 sound calibrators are based on the use of a working standard microphon
29、e, as specified in IEC 61094-4, for demonstrations of conformance to the requirements of this standard. A multi-level and multi-frequency sound calibrator has the same class designation for all sound pressure level and frequency combinations for which the instruction manual states that the instrumen
30、t conforms to the requirements of this standard. This standard does not include requirements for equivalent free-field or random-incidence sound pressure levels, such as may be used in the overall sensitivity adjustment of a sound level meter. A sound calibrator may provide other functions, for exam
31、ple, tonebursts. Requirements for these other functions are not included in this standard. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest editio
32、n of the referenced document (including any amendments) applies. IEC 60050(801):1994, International Electrotechnical Vocabulary (IEV) Chapter 801: Acoustics and electroacoustics IEC 61000-4-2:1995, Electromagnetic compatibility (EMC) Part 4: Testing and measurement techniques Section 2: Electrostati
33、c discharge immunity test. Basic EMC Publication IEC 61000-4-3:2002, Electromagnetic compatibility (EMC) Part 4-3: Testing and measure- ment techniques Radiated, radio-frequency, electromagnetic field immunity test. Basic EMC Publication Page5 EN60942:20033002:CEI 24906 6 IEC 61000-6-1:1997, Electro
34、magnetic compatibility (EMC) Part 6: Generic standards Section 1: Immunity for residential, commercial and light-industrial environments IEC 61094-1:2000, Measurement microphones Part 1: Specifications for laboratory standard microphones IEC 61094-2:1992, Measurement microphones Part 2: Primary meth
35、od for pressure calibration of laboratory standard microphones by the reciprocity technique IEC 61094-4:1995, Measurement microphones Part 4: Specifications for working standard microphones IEC 61094-5:2001, Measurement microphones Part 5: Methods for pressure calibration of working standard microph
36、ones by comparison IEC 61672-1:2002, Electroacoustics Sound level meters Part 1: Specifications CISPR 22:1997, Information technology equipment Radio disturbance characteristics Limits and methods of measurement CISPR/IEC 61000-6-3:1996, Electromagnetic compatibility (EMC) Part 6: Generic standards
37、Section 3: Emission standard for residential, commercial and light-industrial environments ISO/IEC Guide :1995, Guide to the expression of uncertainty in measurement ISO 266:1997, Acoustics Preferred frequencies ISO Publication:1993, ISBN 92-67-01075-1, International vocabulary of basic and general
38、terms in metrology OIML International Recommendation R 97:1990, Barometers 3 Terms and definitions For the purposes of this International Standard, the definitions contained in IEC 60050(801) and the ISO Publication International Vocabulary of Basic and General Terms in Metrology, as well as the fol
39、lowing definitions, apply. Definitions for other relevant quantities are given in the documents referenced in Clause 2. 3.1 sound calibrator device that generates a sinusoidal sound pressure of specified sound pressure level and frequency when coupled to specified models of microphone in specified c
40、onfigurations 3.2 specified sound pressure level sound pressure level(s) generated under reference environmental conditions for use with a particular microphone model and configuration, valid for either an individual sound calibrator (in the case of a class LS calibrator) or all sound calibrators of
41、 the same model (in the case of a class 1 or class 2 calibrator) Page6 EN60942:20033002:CEI 24906 7 3.3 nominal sound pressure level close approximation to the specified sound pressure level(s), valid for all sound calibrators of the same model, rounded to the nearest decibel (intended for marking)
42、3.4 specified frequency frequency(ies) of the sound generated by the sound calibrator under reference environmental conditions, valid for either an individual sound calibrator (in the case of a class LS calibrator) or all sound calibrators of the same model (in the case of a class 1 or class 2 calib
43、rator) 3.5 nominal frequency close approximation to the specified frequency, often rounded according to ISO 266 (intended for marking) 3.6 principal sound pressure level sound pressure level specified in the instruction manual as principal NOTE Principal sound pressure level is used during demonstra
44、tion of conformance of the sound calibrator to the requirements of this standard. 3.7 principal frequency frequency specified in the instruction manual as principal NOTE Principal frequency is used during demonstration of conformance of the sound calibrator to the requirements of this standard. 3.8
45、replication repeat of a measurement involving coupling the microphone to the sound calibrator and then completely removing the microphone from the sound calibrator 3.9 total distortion ratio in per cent of the root-mean-square of the total distortion components to the root-mean- square of the entire
46、 signal 3.10 reference orientation orientation of a sound calibrator such that the principal axis of the opening of the cavity (the axis along which the microphone is inserted into the cavity) coincides with the principal direction of an emitter or receiver of radiofrequency fields. The opening of t
47、he cavity faces away from the emitter or receiver 3.11 reference plane plane of contact between the microphone and the sound calibrator 3.12 effective load volume of a microphone volume of air at reference environmental conditions that has the same acoustic compliance as the cavity bounded by the re
48、ference plane, the microphone diaphragm and the outer cylindrical surface of the microphone at the reference plane, including the equivalent volume of the microphone (see IEC 61094-1) NOTE Effective load volume is generally expressed in cubic millimetres. Page7 EN60942:20033002:CEI 24906 8 4 Referen
49、ce environmental conditions Reference environmental conditions for specifying the performance of a sound calibrator are: air temperature: 23 C static pressure: 101,325 kPa relative humidity: 50 % 5 Requirements 5.1 General 5.1.1 A sound calibrator conforming to the requirements of this standard shall have the characteristics described in this clause. Adaptors may be provided to accommodate more
