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1、BRITISH STANDARD BS 6083-3: 1991 IEC 118-3: 1983 Incorporating Amendment No. 1 Hearing aids Part 3: Methods for measurement of electroacoustical characteristics of hearing aid equipment not entirely worn on the listener Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:45 GMT+00:00 2006,
2、Uncontrolled Copy, (c) BSI BS 6083-3:1991 This British Standard, having been prepared under the direction of the Electronic Equipment Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 28 February 1991 BSI 10-1999 First published February 1981
3、Second edition June 1984 Third edition February 1991 The following BSI references relate to the work on this standard: Committee reference EEL/24 Draft announced in BSI News January 1991 ISBN 0 580 19325 X Committees responsible for this British Standard The preparation of this British Standard was
4、entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technical Committee EEL/24, upon which the following bodies were represented: British Hearing Aid Industry Association British Medical Association British Society of Audiology British Telecommunications plc Confederation of
5、British Industry Department of Health Department of Trade and Industry (National Engineering Laboratory) Department of Trade and Industry (National Physical Laboratory) Health and Safety Executive Institute of Acoustics Institute of Sound and Vibration Research Institution of Electrical Engineers Me
6、dical Research Council National Health Services Royal Aeronautical Society Royal National Institute for the Deaf Society of Environmental Engineers Society of Hearing Aid Audiologists Limited University of Exeter Amendments issued since publication Amd. No.DateComments 6398May 1991Indicated by a sid
7、eline in the margin Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6083-3:1991 BSI 10-1999i Contents Page Committees responsibleInside front cover National forewordii Introduction1 1Scope1 2Object1 3Test equipment1 4Test procedure1 5Rela
8、tion between transmitting and receiving devices in case of wireless transmission3 6Power supply3 7Safety requirements3 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6083-3:1991 ii BSI 10-1999
9、National foreword This Part of BS 6083 has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is identical with IEC 118-3:1983 “Hearing aids Part 3: Hearing aid equipment not entirely worn on the listener”, published by the International Electrotechnical Com
10、mission (IEC). This standard implements Harmonization Document HD 450.3 S1, published by the European Committee for Electrotechnical Standardization (CENELEC), it reinstates a clause “7 Safety requirements” which had been originally part of the IEC publication, but had been excluded from the text of
11、 BS 6083-3:1984 which is withdrawn. BS 6083 consists of the following Parts: Part 0: Methods for measurement of electroacoustical characteristics; Part 1: Methods for measurement of characteristics of hearing aids with induction pick-up coil input; Part 2: Methods for measurement of electroacoustica
12、l characteristics of hearing aids with automatic gain control circuits; Part 3: Methods for measurement of electroacoustical characteristics of hearing aid equipment not entirely worn on the listener; Part 4: Specification for magnetic field strength in audio-frequency induction loops for hearing ai
13、d purposes; Part 5: Specification for dimensions of the nipple and sealing device for insert earphones; Part 6: Specification for characteristics of electrical input circuits for hearing aids; Part 7: Method for measurement of performance characteristics of hearing aids for quality inspection on del
14、ivery; Part 8: Methods for measurement of performance characteristics of hearing aids under simulated in situ working conditions; Part 9: Method for measurement of characteristics of hearing aids with bone vibrator output; Part 10: Guide to hearing aid standards; Part 11: Specification for symbols a
15、nd other markings on hearing aids and related equipment. Cross-references International StandardCorresponding British Standard IEC 118-0:1983BS 6083 Hearing aids Part 0:1984 Methods for measurement of electroacoustical characteristics (Identical) IEC 268BS 6840 Sound system equipment IEC 268-3:1988P
16、art 3:1989 Methods for specifying and measuring the characteristics of sound system amplifiers (Identical) IEC 268-4:1972Part 4:1987 Methods for specifying and measuring the characteristics of microphones (Identical) IEC 711:1981BS 6310:1982 Specification for occluded-ear simulator for the measureme
17、nt of earphones coupled to the ear by ear inserts (Identical) Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6083-3:1991 BSI 10-1999iii IEC 65:1985, to which reference is made in the text, has been harmonized by CENELEC under HD 195 and
18、is implemented by BS 415:1990 “Specification for safety requirements for mains-operated electronic and related apparatus for household and similar general use” which is a related British Standard. Related British Standards to IEC 303 and IEC 318 are BS 4668:1971 “Specification for an acoustic couple
19、r (IEC reference type) for calibration of earphones used in audiometry” and BS 4669:1971 “Specification for an artificial ear of the circle band type for the calibration of earphones used in audiometry” respectively. A British Standard does not purport to include all the necessary provisions of a co
20、ntract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 4, an inside back c
21、over 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 front cover. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv
22、blank Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6083-3:1991 BSI 10-19991 Introduction In the rehabilitation of persons having impaired hearing, use is made of two types of electroacoustic amplification systems: a) Hearing aids entir
23、ely worn on the listener. b) Hearing aid equipment in which the microphone or microphones are not worn on the listener. IEC Publication 118-0: Hearing Aids, Part 0: Measurement of Electroacoustical Characteristics, gives details of methods of measurements on hearing aids and in general covers the re
24、quirements for other hearing aid equipment. However, measurements on hearing aid equipment involve certain test differences which are detailed in this standard. Reference is made wherever possible to IEC Publication 268: Sound System Equipment, for measurements not covered in IEC Publication 118-0.
25、1 Scope The purpose of this standard is to describe a method of determining the overall electroacoustic performance of hearing aid equipment not entirely worn on the listener, used in the rehabilitation of persons having impaired hearing. 2 Object The methods specified in this publication give infor
26、mation on the measurement of those parameters that are not fully covered in IEC Publication 118-0; i.e.: Frequency response. Air to air gain. Acoustic output. Gain and output controls. Internal noise of the equipment. Electrical input sensitivity and output power. Overall effect of transmission path
27、s in systems where the microphone(s) is (are) not connected by wire to the earphone(s). Measurements other than the above are specified in IEC publications, for example IEC Publication 118-0 and IEC Publication 268. 3 Test equipment 3.1 General Throughout this standard, all sound pressure levels spe
28、cified are referred to 20 4Pa. All voltage level measurements are referred to 1 V. All results can be given as r.m.s. values. NOTEWith non-sinusoidal signals appreciable measuring errors can arise when using instruments which measure mean values but are calibrated in r.m.s. terms. 3.2 Acoustic requi
29、rements for testing microphones The microphone shall be placed in an acoustic test field in accordance with IEC Publication 268-4: Part 4: Microphones, under the stated conditions appropriate to the microphone used and connected to the amplifying system. Where the microphone is separate from the amp
30、lifier, only the microphone shall be placed in the acoustic test field. Where the microphone is an integral part of a main unit, the whole unit shall be placed in the sound field. The method of measurement shall be described in the test report. 3.3 Acoustic couplers IEC Publication 318: An IEC Artif
31、icial Ear, of the Wideband Type, for the Calibration of Earphones Used in Audiometry, describes the preferred device for measuring the acoustic output of supra-aural earphones. IEC Publication 303: IEC Provisional Reference Coupler for the Calibration of Earphones Used in Audiometry, describes an ac
32、oustic coupler for supra-aural earphones which may be used if a device conforming to IEC Publication 318 is not available. NOTEUntil specifications are available for an agreed method and device for measuring the performance of circumaural earphones on an acoustic coupler, these measurements should b
33、e accompanied by a detailed description of the method of mounting and coupling the earphone on the acoustic coupler. If loudness balance techniques are used to establish the performance of earphones, the method should be stated. IEC Publication 711: Occluded-ear Simulator for the Measurement of Earp
34、hones Coupled to the Ear by Ear Inserts, describes a suitable coupler for earphones of the insert type. Reported measurements must state the coupler or artificial ear used. 4 Test procedure The characteristics measured are valid only for a stated combination of microphones, amplifiers and earphones.
35、 For reference purposes, measurements shall be made with one microphone and one earphone and then with the maximum number of earphones and microphones to be used with the equipment. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:45 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6083-3:1
36、991 2 BSI 10-1999 4.1 Normal operating conditions for equipment The normal conditions for measurements prescribed are as in IEC Publication 118-0, where relevant, and in addition: a) The frequency range for test purposes shall be extended where possible from 100 Hz to 8 000 Hz. b) The output attenua
37、tor, where fitted, shall be set to a stated position. c) The setting of the tone controls shall be stated; if normal positions of these controls are indicated, these shall be used. d) Where more than one earphone is connected, earphones not on the test coupler should be acoustically loaded in an app
38、ropriate manner. e) Because of the possible size of the unit housing the microphone, special attention should be given to using adequate separation from the sound source and in general the substitution method should be used (see IEC Publication 118-0). f) If a visual monitoring device is provided, i
39、t should be set as in Sub-clause 4.8. 4.2 Basic frequency response A frequency response curve is to be obtained in the following manner: a) The controls shall be set as in Sub-clause 4.1. Where a monitoring device is included, see Sub-clause 4.8. b) The earphone shall be connected to the acoustic co
40、upler without leakage. c) The frequency response shall be the sound pressure level in the acoustic coupler measured as a function of frequency for an input sound pressure level of 60 dB as described in IEC Publication 118-0. An additional measurement shall be made with an input sound pressure level
41、of 90 dB. The gain control should be adjusted to give normal operating conditions. 4.3 Maximum acoustic gain To be measured as in IEC Publication 118-0. See also Sub-clause 4.8 of this standard. 4.4 Output attenuator Output attenuators may be either of the discrete step or continuously variable type
42、. The purpose of this test is to determine the accuracy of the attenuator steps where stated. The test conditions shall be as in Sub-clauses 4.1 and 4.8. The sound pressure level in the coupler shall be measured for the maximum setting of the output control. The measurement shall then be repeated at
43、 each setting of the control, or if a continuously variable control is used, at each marked interval. The difference in sound pressure level between each position and the maximum setting of this control shall be noted. 4.5 Internal noise The purpose of this test is to determine the internal electric
44、al noise from the equipment. The recommended test procedure is as described in IEC Publication 118-0. Levels of hum at 50/60 Hz and 100/120 Hz shall be stated separately as sound pressure levels in the coupler. NOTEIt will be necessary to use a filter system, for example octave or third-octave, to e
45、nsure accurate measurements of the hum components. See IEC Publication 268-3, Part 3: Sound System Amplifiers. 4.6 Electrical input sensitivity Where an electrical signal is to be fed into the equipment from an external source, i.e. tape recorder, etc., the following conditions shall be stated: a) T
46、he input impedance of the equipment, which is measured in accordance with IEC Publication 268-3. b) The sensitivity for the input socket at a specified frequency, i.e. the voltage required to obtain maximum output level or the 10 % distortion level with the gain control full-on, measured in accordan
47、ce with IEC Publication 268-3. c) The acoustic measurements may be repeated with a stated electrical input level, in which case the electrical input shall be adjusted to give an output sound pressure level of 100 dB. Licensed Copy: sheffieldun sheffieldun, na, Tue Dec 05 04:49:45 GMT+00:00 2006, Unc
48、ontrolled Copy, (c) BSI BS 6083-3:1991 BSI 10-19993 4.7 Electrical output The electrical signal power output from the equipment, for example with an induction loop where fitted, shall be measured in accordance with IEC Publication 268-3 and in addition: a) The controls shall be set as in Sub-clause
49、4.1. b) The electrical output socket shall be loaded with an appropriate resistive load to match the stated output impedance of the socket or with the device intended to be used in that socket. c) The power output shall be measured at the reference setting of the monitoring device and stated in watts. Reference shall be made to the effect of using inductive or capacitive loads. d) The 1 600 Hz or 2 500 Hz when appropriate electrical input level at a specified input socket required for maximum rated output (10 % harmonic distortion) shall be stated. 4.8