EN 60118-7-2005 en Electroacoustics C Hearing aids Part 7 Measurement of the performance characteristics of hearing aids for production supply and delivery quality assurance purpos.pdf

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1、BRITISH STANDARDBS EN 60118-7:2005Electroacoustics Hearing aids Part 7: Measurement of the performance characteristics of hearing aids for production, supply and delivery quality assurance purposesThe European Standard EN 60118-7:2005 has the status of a British StandardICS 17.140.50g49g50g3g38g50g5

2、1g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 60118-7:2005This British Standard was published under the authority of the Standards Policy and Strategy Commi

3、ttee on 14 February 2006 BSI 14 February 2006ISBN 0 580 47661 8National forewordThis British Standard is the official English language version of EN 60118-7:2005. It is identical with IEC 60118-7:2005. It supersedes BS EN 60118-7:1993 which is withdrawn.The UK participation in its preparation was en

4、trusted to Technical Committee EPL/29, Electroacoustics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this

5、 document may be found in the BSI Catalogue 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 contr

6、act. Users are responsible for its 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 fo

7、r change, and keep UK interests informed; monitor related international and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 23 and a back cover.The BSI copyright notice displayed in this d

8、ocument indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARD EN 60118-7 NORME EUROPENNE EUROPISCHE NORM December 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Euro

9、pisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60118-7:2005 E ICS 17.140.50 Supersedes EN 60118-7:1993 + A1:1994English

10、version Electroacoustics Hearing aids Part 7: Measurement of the performance characteristics of hearing aids for production, supply and delivery quality assurance purposes (IEC 60118-7:2005) Electroacoustique Appareils de correction auditive Partie 7: Mesure des caractristiques fonctionnelles des ap

11、pareils de correction auditive aux fins dassurance de la qualit de la production, de la livraison et des approvisionnements (CEI 60118-7:2005) Akustik Hrgerte Teil 7: Messung der bertragungseigenschaften von Hrgerten zum Zwecke der Qualittssicherung in der Herstellung, Versorgung und Lieferung (IEC

12、60118-7:2005) This European Standard was approved by CENELEC on 2005-12-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bi

13、bliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibi

14、lity 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 electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary,

15、Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Foreword The text of document 29/585/FDIS + 29/587/INF, future edition 2 of IEC 60118-7, prepared by IEC TC 29, Electroacoustics, w

16、as submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60118-7 on 2005-12-01. This European Standard supersedes EN 60118-7:1993 + A1:1994. This European Standard includes major changes, e.g. regarding the definition of reference test gain. In general this edition aligns IEC

17、60118-7 and the ANSI S3.22 (2003) standard. 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) 2006-09-01 latest date by which the national standards conflicting with the EN have

18、 to be withdrawn (dow) 2008-12-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60118-7:2005 was approved by CENELEC as a European Standard without any modification. _ EN 60118-7:2005 2 3 EN 60118-7:2005 CONTENTS 1 Scope 4 2 Normative references

19、.4 3 Terms and definitions .4 4 General conditions7 5 Nominal characteristics and tolerances .8 6 Test box and test equipment.8 7 Test conditions .10 8 Measurements, specifications and tolerances14 9 Maximum permitted expanded uncertainty of measurements .21 Bibliography .22 corresponding European p

20、ublications23 Figure 1 Example of test arrangement for behind the ear hearing aid 11 Figure 2 Example of test arrangement for in-the-ear hearing aid .12 Figure 3 Example of OSPL90 and basic frequency response curves15 Figure 4 Example of basic frequency response curve, its tolerances and determinati

21、on of frequency range 17 Table 1 Resistance and open circuit voltages for battery simulator13 Table 2 Tolerances of the frequency response17 Table 3 Distortion test frequencies and input sound pressure levels18 Table 4 Values of Umaxfor basic measurements21 Annex ZA (normative) Normative references

22、to international publications with their EN 60118-7:2005 4 ELECTROACOUSTICS HEARING AIDS Part 7: Measurement of the performance characteristics of hearing aids for production, supply and delivery quality assurance purposes 1 Scope This part of IEC 60118 gives recommendations for the measurement of t

23、he performance characteristics of air-conduction hearing aids of a particular model for production, supply and delivery quality assurance purposes. The manufacturer will normally assign nominal values. This standard does not relate to mechanical or environmental tests. It should not be used as the b

24、asis for the exchange of information about hearing aid characteristics in general, nor is it intended to be used as a predictor for real-ear performance. NOTE Terms such as “manufacturer“ and “purchaser“ are used in this standard. These terms may be understood, however, to refer to the supplier and

25、recipient respectively in any arrangement for the supply of hearing aids in which the use of this standard is called for. Though the number of measurements covered by this standard is limited, it is not intended that all measurements described herein shall be made in every case. This second edition

26、now specifies performance requirements. Conformance to the specifi-cations in this standard is demonstrated only when the result of a measurement, extended by the actual expanded uncertainty of measurement of the testing laboratory, lies fully within the tolerances specified in this standard extende

27、d by the values for Umaxgiven in Table 4. In case of custom-made in-the-ear instruments, the data supplied by the manufacturer applies only to the particular hearing aid being tested. 2 Normative references The following referenced documents are indispensable for the application of this document. Fo

28、r dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60318-5, Electroacoustics Simulators of human head and ear Part 5: 2 cm3 coupler for the measurement of hearing aids and earphones coupled

29、 to the ear by means of ear inserts 1)3 Terms and definitions For the purpose of this document, the following terms and definitions apply: 1)To be published. IEC 60318-5 is a revision of IEC 60126:1973, IEC reference coupler for the measurement of hearing aids using earphones coupled to the ear by m

30、eans of ear inserts. 5 EN 60118-7:2005 3.1 sound pressure level SPL all sound pressure levels specified are measured in decibels (dB) referenced to 20 Pa 3.2 high-frequency average HFA average of gain or SPL in decibels at 1 000 Hz, 1 600 Hz and 2 500 Hz 3.3 special purpose hearing aid hearing aid w

31、hose full-on gain at any frequency exceeds its full-on gain at 1 000 Hz, or at 1 600 Hz or at 2 500 Hz by more than 15 dB. If the requirements for being a special purpose hearing aid are met, the manufacturer may substitute the SPA for the HFA NOTE The frequencies used for the SPA should be specifie

32、d by the manufacturer and used for all measurements. 3.4 special purpose average SPA average of gain or SPL in dB at 3 special purpose frequencies for a special purpose hearing aid. The manufacturer shall specify and state three special purpose one-third-octave-band frequencies each separated by two

33、-third octave NOTE Throughout this standard, wherever the term HFA appears, SPA may be substituted for these aids. 3.5 acoustic gain at each test frequency, the difference in decibels obtained by subtracting the input SPL to the hearing aid microphone from the SPL developed by the output from the he

34、aring aid in the acoustic coupler 3.6 gain control manually or electronically operated control for the adjustment of overall gain 3.7 output SPL for 90-dB input SPL OSPL90 SPL developed in the acoustic coupler with an input SPL of 90 dB with the gain control of the hearing aid full-on NOTE It is rec

35、ognized that the maximum output level may occur with more, or occasionally with less, input SPL than 90 dB. However, the differences are usually small over the frequency range of interest and the single input SPL of 90 dB makes automatic recording of the OSPL90 curve very convenient. EN 60118-7:2005

36、 6 3.8 high-frequency average OSPL90 HFA-OSPL90 high-frequency average of the OSPL90 SPL levels 3.9 high-frequency average full-on gain HFA-FOG HFA gain for an input SPL of 50 dB when the gain control of the hearing aid is at its full-on position 3.10 reference test setting of the gain control RTS f

37、or an input SPL of 60 dB, the setting of the gain control required to produce an HFA-gain within 1,5 dB of the HFA-OSPL90 minus 77 dB. If the full-on HFA gain for an input SPL of 60 dB is less than the HFA-OSPL90 minus 77 dB, the RTS is the full-on position of the gain control NOTE For linear hearin

38、g aids, the use of an input SPL of 60 dB and a 17 dB gain control setback from the OSPL90 helps to ensure that, for an overall speech level of 65 dB SPL, peaks should not exceed the OSPL90. 3.11 reference test gain RTG HFA gain for an input SPL of 60 dB with the gain control at RTS 3.12 input-output

39、 function single frequency plot of acoustic coupler SPL on the ordinate as a function of input SPL on the abscissa with equal decibel scale divisions on each axis 3.13 automatic gain control AGC means (other than peak clipping) by which the gain is automatically controlled as a function of the level

40、 of the signal being amplified 3.14 AGC hearing aid hearing aid incorporating automatic gain control (AGC) 3.15 directional hearing aid hearing aid for which the gain is dependent on the direction of sound incidence when measured under free-field conditions 7 EN 60118-7:2005 3.16 non-directional hea

41、ring aid hearing aid for which the gain is independent of the direction of sound incidence when measured under free-field conditions 3.17 SPL in a magnetic field SPLI SPL developed in the acoustic coupler with the gain control at RTS when the input is 30 dB re 1 A/m (=31,6 mA/m) sinusoidal alternati

42、ng magnetic field and the input selector of the hearing aid is in T-position (see 8.8) 3.18 high frequency average SPL in a magnetic field HFA-SPLI high-frequency average of the SPLI SPL levels 3.19 equivalent test loop sensitivity ETLS difference obtained by subtracting the (RTG + 60 dB) from the H

43、FA-SPLI 4 General conditions 4.1 Acoustic test method The preferred acoustic test procedure is based on a method of measurement in which the sound pressure level at the reference point of the hearing aid is kept constant. This is accomplished in an acoustic test box by the use of a pressure-calibrat

44、ed control microphone, on the assumption that the sound field is homogeneous around the reference point of the hearing aid. This method is designated “constant entrance sound pressure method“ or shortened “pressure method“ throughout this standard. As an alternative to the pressure method, storage o

45、f a test box frequency response correction curve may be used. This method is designated “substitution method”. The sound output from the hearing aid is coupled to the IEC acoustic coupler according to IEC 60318-5. NOTE 1 The test results may differ substantially from those obtained under free-field

46、conditions, especially for body-worn types of hearing aids having the sound entry located on a surface of the outer housing the physical dimensions of which are comparable to the wavelength of the incident sound. NOTE 2 For measuring the variation of acoustical parameters of hearing aids as a functi

47、on of the direction of sound incidence, progressive wave conditions are required. Small acoustic test boxes in which progressive wave conditions are not present cannot be used for this purpose. EN 60118-7:2005 8 NOTE 3 For testing directional hearing aids, manufacturer and purchaser should use acous

48、tic test boxes of the same make and type to secure identical measurement conditions. The results from such measurements may not represent the true directional characteristics of the hearing aid. 4.2 Reporting of data All data reported shall be clearly labelled: “According to IEC 60118-7:2005“. 5 Nom

49、inal characteristics and tolerances The characteristics with the prefix “nominal“ listed below are those that are assigned by the manufacturer for the hearing aid model in question (see also Figure 1 and Figure 2) and are subject to verification, using the methods described in this standard: nominal reference test gain (see 3.11); nominal OSPL90 (see 8.2); nominal maximum OSPL90 (see 8.2); nominal full-on gain (see 8.3); nominal f