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

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、1g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Tue May 09 07:45:51 BST 2006, Uncontrolled Copy, (c) BSIBS EN 60118-7:2005This British

3、Standard was published under the authority of the Standards Policy and Strategy Committee 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

4、 BS EN 60118-7:1993 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee EPL/29, Electroacoustics, which has the responsibility to: A list of organizations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

5、 Standards which implement international or European publications referred to in this 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

6、.This publication does not purport to include all the necessary provisions of a contract. 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

7、international/European committee any enquiries on the interpretation, or proposals for 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 ti

8、tle page, pages 2 to 23 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Tue May 09 07:45:51 BST 2006, Uncontrolled Copy, (c) BSIEUROPEAN STANDARD EN

9、60118-7 NORME EUROPENNE EUROPISCHE NORM December 2005 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 Brussels 2005 CENELEC - All rights

10、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 version Electroacoustics Hearing aids Part 7: Measurement of the performance characteristics of hearing aids for production, suppl

11、y and delivery quality assurance purposes (IEC 60118-7:2005) Electroacoustique Appareils de correction auditive Partie 7: Mesure des caractristiques fonctionnelles des appareils de correction auditive aux fins dassurance de la qualit de la production, de la livraison et des approvisionnements (CEI 6

12、0118-7:2005) Akustik Hrgerte Teil 7: Messung der bertragungseigenschaften von Hrgerten zum Zwecke der Qualittssicherung in der Herstellung, Versorgung und Lieferung (IEC 60118-7:2005) This European Standard was approved by CENELEC on 2005-12-01. CENELEC members are bound to comply with the CEN/CENEL

13、EC 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 bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CE

14、NELEC member. 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 version

15、s. CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, S

16、weden, Switzerland and United Kingdom. Licensed Copy: Wang Bin, na, Tue May 09 07:45:51 BST 2006, Uncontrolled Copy, (c) BSIForeword The text of document 29/585/FDIS + 29/587/INF, future edition 2 of IEC 60118-7, prepared by IEC TC 29, Electroacoustics, was submitted to the IEC-CENELEC parallel vote

17、 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 60118-7 and the ANSI S3.22 (2003) standard. T

18、he 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 to be withdrawn (dow) 2008-12-01 Annex ZA ha

19、s 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 Licensed Copy: Wang Bin, na, Tue May 09 07:45:51 BST 2006, Uncontrolled Copy, (c) BSI 3 EN 60118-7:2005 C

20、ONTENTS 1 Scope 4 2 Normative references .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

21、Bibliography .22 corresponding European publications23 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 respo

22、nse curve, its tolerances and determination 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 A

23、nnex ZA (normative) Normative references to international publications with their Licensed Copy: Wang Bin, na, Tue May 09 07:45:51 BST 2006, Uncontrolled Copy, (c) BSIEN 60118-7:2005 4 ELECTROACOUSTICS HEARING AIDS Part 7: Measurement of the performance characteristics of hearing aids for production

24、, supply and delivery quality assurance purposes 1 Scope This part of IEC 60118 gives recommendations for the measurement of the performance characteristics of air-conduction hearing aids of a particular model for production, supply and delivery quality assurance purposes. The manufacturer will norm

25、ally assign nominal values. This standard does not relate to mechanical or environmental tests. It should not be used as the basis 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 “

26、manufacturer“ and “purchaser“ are used in this standard. These terms may be understood, however, to refer to the supplier and 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 st

27、andard is limited, it is not intended that all measurements described herein shall be made in every case. This second edition 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 expa

28、nded uncertainty of measurement of the testing laboratory, lies fully within the tolerances specified in this standard extended 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 bein

29、g tested. 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 edition of the referenced document (including any amendments) applies. IEC 60318-5, Ele

30、ctroacoustics Simulators of human head and ear Part 5: 2 cm3 coupler for the measurement of hearing aids and earphones coupled 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

31、 revision of IEC 60126:1973, IEC reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear inserts. Licensed Copy: Wang Bin, na, Tue May 09 07:45:51 BST 2006, Uncontrolled Copy, (c) BSI 5 EN 60118-7:2005 3.1 sound pressure level SPL all sound pressure l

32、evels 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 whose full-on gain at any frequency exceeds its full-on gain at 1 000 Hz, or at 1 600 Hz

33、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 specified by the manufacturer and used for all measurements. 3.4 special purpose average SPA ave

34、rage 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-third octave NOTE Throughout this standard, wherever the term HFA appears, SPA may be s

35、ubstituted 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 hearing aid in the acoustic coupler 3.6 gain control manually or electronically operated c

36、ontrol 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 recognized that the maximum output level may occur with more, or occasionally with less, in

37、put 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. Licensed Copy: Wang Bin, na, Tue May 09 07:45:51 BST 2006, Uncontrolled Copy, (c) BSIEN 60118-7:2005 6

38、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 for

39、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 hearing a

40、ids, 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 fu

41、nction 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 of

42、 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 Licensed Copy: Wang Bin, na, Tue May 09 07:45

43、:51 BST 2006, Uncontrolled Copy, (c) BSI 7 EN 60118-7:2005 3.16 non-directional hearing 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 gai

44、n control at RTS when the input is 30 dB re 1 A/m (=31,6 mA/m) sinusoidal alternating 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 lo

45、op sensitivity ETLS difference obtained by subtracting the (RTG + 60 dB) from the HFA-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 const

46、ant. This is accomplished in an acoustic test box by the use of a pressure-calibrated 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 me

47、thod“ throughout this standard. As an alternative to the pressure method, storage of 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. NOT

48、E 1 The test results may differ substantially from those obtained under free-field 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

49、 2 For measuring the variation of acoustical parameters of hearing aids as a function 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. Licensed Copy: Wang Bin, na, Tue May 09 07:45:51 BST 2006, Uncontrolled Copy, (c) BSIEN 60118-7:2005 8 NOTE 3 For testing directional hearing aids, manufacturer and purch