1、BRITISH STANDARDBS EN 60318-6:2008Electroacoustics Simulators of human head and ear Part 6: Mechanical coupler for the measurement of bone vibratorsICS 17.140.50g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g4
2、4g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 60318-6:2008This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 September 2008 BSI 2008ISBN 978 0 580 55013 3National forewordThis British Standard is the UK implementation of
3、EN 60318-6:2008. It is identical to IEC 60318-6:2007. It supersedes BS 4009:1991 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee EPL/29, Electroacoustics.A list of organizations represented on this committee can be obtained on request to its secretary.
4、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 cannot confer immunity from legal obligations. Amendments/corrigenda issued since publicationDate CommentsEUROPEAN STANDARD EN
5、 60318-6 NORME EUROPENNE EUROPISCHE NORM July 2008 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 2008 CENELEC - All rights of
6、exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 60318-6:2008 E ICS 17.140.50 Supersedes HD 590 S1:1991English version Electroacoustics - Simulators of human head and ear - Part 6: Mechanical coupler for the measurement of bone vibrators (IEC 60318-6:2007
7、) Electroacoustique - Simulateurs de tte et doreille humaines -Partie 6: Coupleur mcanique destin la mesure des ossivibrateurs (CEI 60318-6:2007) Akustik - Simulatoren des menschlichen Kopfes und Ohres - Teil 6: Mechanischer Kuppler fr Messungen an Knochenleitungshrern(IEC 60318-6:2007) This Europea
8、n Standard was approved by CENELEC on 2008-06-01. 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 bibliographical references c
9、oncerning 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 responsibility of a CENELEC member i
10、nto 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, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ire
11、land, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. Foreword The text of document 29/615/CDV, future edition 1 of IEC 60318-6, prepared by IEC TC 29, Electroacoustics, was submit
12、ted to the IEC-CENELEC parallel Unique Acceptance Procedure and was approved by CENELEC as EN 60318-6 on 2008-06-01. This European Standard supersedes HD 590 S1:1991. The following dates were fixed: latest date by which the EN has to be implemented at national level by publication of an identical na
13、tional standard or by endorsement (dop) 2009-03-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2011-06-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 60318-6:2007 was approved by CENELEC as a E
14、uropean Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60118-9 NOTE Harmonized as HD 450.9 S1:1987 (not modified). IEC 60645-1 NOTE Harmonized as EN 60645-1:2001 (not modified). ISO 389-3 NOTE Harmon
15、ized as EN ISO 389-3:1998 (not modified). ISO 266 NOTE Harmonized as EN ISO 266:1997 (not modified). _ BS EN 60318-6:2008 2 CONTENTS 1 Scope.4 2 Normative reference .4 3 Terms and definitions .4 4 Construction.5 4.1 General .5 4.2 Mechanical impedance level6 4.3 Phase angle of mechanical impedance7
16、4.4 External geometry .7 5 Calibration7 5.1 Reference environmental conditions7 5.2 Calibration procedure 7 5.3 Force sensitivity level7 5.4 Mechanical impedance level8 5.5 Temperature dependence8 6 Marking and instruction manual 8 6.1 Marking of the mechanical coupler 8 6.2 Instruction manual.8 7 C
17、oupling of bone vibrator to the mechanical coupler.8 8 Maximum permitted expanded uncertainty of measurements 10 Annex A (informative) Example of a specific construction of a mechanical coupler.10 Annex B (informative) Guidance on the testing and calibration of mechanical couplers 13 Bibliography14
18、Figure A.1 Dimensions of mechanical impedance element base.11 Figure A.2 Dimensions of tungsten loading insert.11 Figure A.3 Assembly of the mechanical coupler .12 Table 1 Mechanical impedance level6 Table 2 Values of Umaxfor basic measurements 9 Annex ZA (normative) Normative references to internat
19、ional publications with theircorresponding European publications15BS EN 60318-6:2008 3 ELECTROACOUSTICS SIMULATORS OF HUMAN HEAD AND EAR Part 6: Mechanical coupler for the measurement of bone vibrators 1 Scope This part of IEC 60318 describes a mechanical coupler for the measurement of the output fo
20、rce of bone vibrators. The mechanical impedance of the coupler is specified in the frequency range 125 Hz to 8 000 Hz. The coupler is intended for calibration of audiometers using bone vibrators having a plane circular tip area of 175 mm 25 mm and for determining the performance of bone conduction h
21、earing aids. The vibratory force developed by a bone vibrator is not, in general, the same on the coupler as on a persons mastoid. However, the IEC recommends its use as a means for the calibration of specified vibrators used in audiometry and for the exchange of specifications and of data on bone c
22、onduction hearing aids. NOTE Some bone vibrators of hearing aids and some non-standardised bone vibrators still used in audiometry have a curved surface. Users should be aware that those vibrators in general will not be loaded on the mechanical coupler with the same mechanical impedance as the one s
23、pecified in Table 1 of this standard. 2 Normative reference The following referenced document is 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)
24、applies. BIPM, IEC, ISO, IFCC, IUPAC, IUPAP and OIML:1995, Guide to the expression of uncertainty in measurement (GUM) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 bone-conduction vibrator bone vibrator electro-mechanical transducer that t
25、ransforms electric oscillations into mechanical vibrations and is intended to be coupled to the bony structure of the head, most commonly the mastoid apophysis 3.2 mechanical coupler device for calibrating bone-conduction vibrators designed to present a specified mechanical impedance to a vibrator a
26、pplied with a specified static force, and equipped with an electromechanical transducer to enable the vibratory force level at the surface of contact between vibrator and mechanical coupler to be determined 3.3 alternating force level ten times the logarithm to the base 10 of the ratio of the square
27、d r.m.s. value of the alternating force transmitting the vibration to the square of the reference value of one micronewton BS EN 60318-6:2008 4 NOTE 1 The unit of the level re 1N is decibel (dB). NOTE 2 The alternating force level is also called force level. 3.4 mechanical impedance for a sinusoidal
28、 signal, the complex quotient of the alternating force transmitting the vibration by the component of velocity of the object in the direction of the force NOTE The unit is newton second per meter (Ns/m). 3.5 mechanical impedance level ten times the logarithm to the base 10 of the ratio of the square
29、d absolute value (modulus) of the mechanical impedance to the square of the reference value of one newton second per meter (Ns/m) NOTE The unit of the level re 1 Ns/m is decibel (dB). 3.6 mechanical resistance real part of the mechanical impedance NOTE The unit is newton second per meter (Ns/m). 3.7
30、 mechanical reactance imaginary part of the mechanical impedance NOTE The unit is newton second per meter (Ns/m). 3.8 force sensitivity quotient of output voltage of the mechanical coupler by the applied alternating force NOTE The unit is volt per newton (V/N). 3.9 force sensitivity level ten times
31、the logarithm to the base 10 of the ratio of the squared force sensitivity to the square of the reference force sensitivity of one volt per newton (V/N) NOTE The unit of the level re 1 V/N is decibel (dB). 4 Construction 4.1 General The mechanical coupler shall consist of a rigid mass of approximate
32、ly 3,5 kg containing a force-sensing element which is surmounted by visco-elastic material having an external profile as specified in 4.4. The mechanical impedance of the assembly for uniaxial vibration which is coincident with its major axis of symmetry shall comply with the specifications in 4.2 a
33、nd 4.3. The whole assembly shall be supported in such a way as to be capable of sustaining a static force of up to 6 N (including the weight of the vibrator under test, if mounted on a vertical axis) with a frequency of natural oscillation on the supports not greater than 12,5 Hz. NOTE 1 It is recom
34、mended to include a temperature-sensing device in intimate contact with the bulk mass of the mechanical coupler, to permit correct measurement of its temperature during use and calibration (see 5.5). NOTE 2 An example of a mechanical coupler complying with this part of IEC 60318 is described in Anne
35、x A. BS EN 60318-6:2008 5 In the following, the specified tolerance shall be reduced by an amount equal to the actual expanded measurement uncertainty of the test laboratory before deciding if a device conforms to this specification (see Clause 8). 4.2 Mechanical impedance level The mechanical coupl
36、er shall present a mechanical impedance at a temperature of 23 C having the levels specified in Table 1 within the specified tolerances, when driven by a vibrator having a plane circular tip area of 175 mm2and applied with a static force of 5,4 N 0,5 N including (when the apparatus is mounted with i
37、ts axis vertical) the weight of the vibrator and of any unsupported components of the force-delivery device. The frequencies shall be equal to the stated values in Table 1 within 1 %. Table 1 Mechanical impedance level Frequency Hz Mechanical impedance level (reference: 1 Ns/m) dB Tolerance dB 125 4
38、8,9 2,5 160 47,4 2,200 45,8 2,5 250 44,3 2,315 42,9 2,5 400 41,3 2,500 39,9 2,5 630 38,5 2,750a37,4 2,5 800 37,0 2,1 000 35,5 3,2 1 250 34,0 3,2 1 500a32,4 3,1 600 31,9 3,2 2 000 29,8 3,2 2 500 27,8 3,2 3 000a27,2 3,3 150 27,3 3,2 4 000 29,5 3,2 5 000 32,6 3,5 6 000a34,4 3,5 6 300 34,6 3,5 8 000 35,
39、1 3,5 aThese frequencies are used in audiometry but are not included in the preferred series specified in ISO 266 4 1). NOTE 1 Values of the mechanical impedance level and tolerances are derived from experimental data on samples of mechanical couplers. Under similar conditions but with the static fo
40、rce reduced to 2,5 N 0,5 N, the mechanical impedance level at 250 Hz shall be 2,0 dB 0,9 dB below the value measured with the static force of 5,4 N. NOTE 2 This constitutes a performance specification and the lower value of static force is not necessarily recommended to be used when testing any part
41、icular hearing-aid device. 1)The figures in square brackets refer to the Bibliography. BS EN 60318-6:2008 6 4.3 Phase angle of mechanical impedance The phase angle of the mechanical impedance of the mechanical coupler at a frequency of 250 Hz and a temperature of 23 C shall be 63,0 6,0, when driven
42、under the same conditions as specified in 4.2, with a static force of 5,4 N. 4.4 External geometry The contact surface of the mechanical coupler, without an applied external static force, shall be spherical with a nominal radius of 96 mm. The exposed portion of the sphere shall be circular in shape
43、with a minimum diameter of 35 mm. Within this diameter the surface shall be smooth and the tolerance on the spherical radius shall be 17 mm. Outside this diameter the external profile of the mechanical coupler shall be such as to avoid interference with any bone vibrator which it is intended to test
44、. 5 Calibration 5.1 Reference environmental conditions Reference temperature: 23 C Reference relative humidity: 50 % NOTE The mechanical impedance and the force sensitivity of mechanical couplers designed according to this part of IEC 60318 do not depend on ambient pressure. 5.2 Calibration procedur
45、e The manufacturer shall describe method(s) for calibrating and determining the overall stability of the mechanical coupler in an instruction manual. The calibration shall be performed for the reference environmental conditions given in 5.1 with the following tolerances: Temperature: 1 C Relative hu
46、midity: 20 % NOTE For the purpose of calibration and elsewhere in this part of IEC 60318 where temperature is specified, the stated temperature is that of the mechanical coupler. Due to the large thermal capacity of the mass comprising the body of the device, it may take several hours to attain ther
47、mal equilibrium. It is not adequate to rely on a measurement of room temperature. 5.3 Force sensitivity level The mechanical coupler shall be calibrated by the manufacturer in terms of its force sensitivity level at the frequencies listed in Table 1. The electrical load conditions shall be stated. A
48、 calibration table or a graph, together with a statement defining the uncertainty, shall be supplied with each mechanical coupler. The calibration uncertainty shall not exceed 0,4 dB for frequencies up to and including 800 Hz and 0,5 dB above 800 Hz up to and including 4 kHz nor shall it exceed 1,0
49、dB for frequencies up to and including 8 kHz. NOTE 1 The mechanical impedance of an external surface at a specified location is usually measured by means of an impedance head. This device consists of an acceleration transducer and a force transducer and is driven by an external exciter (shaker). It is pressed against the surface under test with a specified static application force. BS EN 60318-6:2008 7 NOTE 2 Measurement of the app
