BS EN 60645-1:2017
$189.07
Electroacoustics. Audiometric equipment – Equipment for pure-tone and speech audiometry
| Published By | Publication Date | Number of Pages |
| BSI | 2017 | 48 |
IEC 60645-1:2017 is also available as /2 which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition. IEC 60645-1:2017 specifies general requirements for audiometers designed for use in determining hearing threshold levels, relative to standard reference threshold levels established by means of psychoacoustic test methods, and those designed to perform psychoacoustic tests using speech material. The object of this standard is to ensure: a) that tests of hearing in the frequency range 125 Hz to 16 kHz on a given human ear, performed with different pure-tone audiometers which comply with this standard, give substantially the same results; b) that the results obtained represent a valid comparison between the hearing of the ear tested and the reference threshold of hearing; c) that a means of presenting speech material to a subject in a standardized manner is provided. This will ensure that tests of hearing using a specific speech signal and a specific manner of signal presentation, when performed with different audiometers which comply with this standard, give substantially the same results; d) that audiometers are classified according to the range of test signals they present, according to the mode of operation or according to their presumed primary application. This fourth edition cancels and replaces the third edition, published in 2012, and the first edition IEC 60645-2, published in 1993. This edition constitutes a technical revision. This edition now includes the requirements for both pure-tone (prior edition of IEC 60645-1) and speech audiometers (prior edition of IEC 60645-2) into a single document. The technical requirements in this edition remain similar to the intent of the prior two documents, but now eliminate technical and editorial contradictions caused by two separate standards with different review cycles applying to an audiometer.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 7 | English CONTENTS |
| 10 | FOREWORD |
| 12 | INTRODUCTION |
| 13 | 1 Scope 2 Normative references |
| 14 | 3 Terms and definitions |
| 18 | 4 Requirements by type and class of audiometer |
| 19 | Tables Table 1 – Minimum facilities for audiometers |
| 20 | 5 General requirements 5.1 General safety requirements 5.2 Acoustic safety requirements 5.3 Environmental conditions 5.4 Warm-up time 5.5 Power supply variation 5.5.1 Interruption of power supply 5.5.2 Mains operation 5.5.3 Battery operation |
| 21 | 5.5.4 Other power supplies 5.6 Electromagnetic compatibility 5.7 Unwanted sound 5.7.1 General 5.7.2 Unwanted sound from and between any combination of transducers 5.7.3 Unwanted sound from an earphone 5.7.4 Unwanted sound from a bone vibrator |
| 22 | 5.7.5 Unwanted sound radiated by an audiometer 5.8 Testing of automatic-recording audiometers 5.9 Interface connections 6 Test signals 6.1 Speech signals 6.1.1 Speech signal general requirements 6.1.2 Free-field equivalent earphone output level |
| 23 | 6.1.3 Uncorrected earphone output level 6.1.4 Loudspeaker output level 6.1.5 Bone vibrator output level 6.1.6 Speech signal frequency response 6.1.7 Calibration signal 6.1.8 Live voice microphone frequency response |
| 24 | 6.1.9 Scale reference and output level 6.1.10 Distortion requirements for speech signals |
| 25 | 6.2 Pure tones 6.2.1 Frequency range and hearing level range Table 2 – Minimum number of frequencies to be provided and the minimum range of values of hearing level for type and class of audiometer |
| 26 | 6.2.2 Frequency acceptance limits 6.2.3 Total harmonic distortion 6.2.4 Rate of frequency change 6.2.5 Frequency modulation Table 3 – Maximum permissible acoustic total harmonic distortion, for supra-aural, circumaural, insert earphones and bone vibrators |
| 27 | 6.3 External signal sources 6.3.1 Signals 6.3.2 Frequency response 6.3.3 Playback device input 6.3.4 Signal-to-noise ratio for playback device input 6.3.5 Electrical sensitivity |
| 28 | 6.3.6 Reference level for external signal source 6.4 Operator and test subject speech communication 6.4.1 General 6.4.2 Operator to test subject speech communication (talk-forward) 6.4.3 Test subject to operator speech communication (talk-back) 6.4.4 Operator to test subject speech communication for live voice speech audiometry |
| 29 | 6.4.5 Test subject to operator speech communication for vocal response speech audiometry 6.5 Masking sound 6.5.1 General 6.5.2 Narrow-band noise |
| 30 | Table 4 – Narrow-band masking noise: upper and lower cut-off frequencies for a sound pressure spectrum density level of –3 dB referenced to the level at the centre frequency of the band |
| 31 | 6.5.3 Speech weighted noise 6.5.4 Other masking sound 7 Transducers 7.1 Types of transducers 7.2 Headband 7.3 Loudspeaker 8 Signal level control 8.1 Marking of pure-tone and speech signal level controls |
| 32 | 8.2 Signal indicator 8.3 Sound pressure level and vibratory force level acceptance limits |
| 33 | 8.4 Signal level control 8.4.1 Manual audiometers 8.4.2 Automatic-recording audiometers 8.4.3 Signal level control acceptance limits 8.5 Masking sound level control 8.5.1 General 8.5.2 Masking sound level |
| 34 | 8.5.3 Masking sound level acceptance limits 8.5.4 Masking sound level range 8.6 Signal switching 8.6.1 Signal switch for manual audiometers 8.6.2 On/off ratio for manual audiometers 8.6.3 Rise/fall times for manual audiometers |
| 35 | 8.6.4 Automatic pulsed presentation 8.6.5 Subject’s response system 8.6.6 Subject’s response time for automated test procedures Figures Figure 1 – Rise/fall envelope of test tones |
| 36 | 9 Reference tone 9.1 General 9.2 Frequencies 9.3 Reference tone level control 9.3.1 Range 9.3.2 Intervals 9.3.3 Marking 9.3.4 Acceptance limits 9.3.5 Operation 10 Calibration |
| 37 | 11 Electrical output of test signals Table 5 – Standards specifying reference equivalent threshold levels |
| 38 | 12 Audiogram format 13 Test requirements to demonstrate conformity 13.1 General 13.2 Environmental conditions and power supply variation Table 6 – Symbols for the graphical presentation of hearing threshold levels |
| 39 | 13.3 Electromagnetic compatibility 13.4 Unwanted sound 13.4.1 Unwanted sound from an earphone |
| 40 | 13.4.2 Unwanted sound from a bone vibrator 13.4.3 Unwanted sound radiated by an audiometer 13.5 Total harmonic distortion of test signals |
| 41 | 13.6 Microphone for live voice speech testing 13.7 Signal accuracy 13.7.1 Accuracy of sound pressure level and vibratory force level 13.7.2 Accuracy of hearing level control 13.8 Masking sound 13.8.1 Narrow-band noise 13.8.2 Masking sound level |
| 42 | 13.9 Headbands 13.9.1 General 13.9.2 Supra-aural and circumaural earphone headband 13.9.3 Bone vibrator headband 14 Maximum permitted expanded uncertainty of measurements Umax |
| 43 | 15 Marking and instruction manual 15.1 Marking 15.2 Instruction manual Table 7 – Values of Umax for basic measurements |
| 45 | Annex A (informative) Relationship between tolerance interval, corresponding acceptance interval and the maximum permitted uncertainty of measurement Figure A.1 – Relationship between tolerance interval, corresponding acceptance interval and the maximum permitted uncertainty of measurement |
| 46 | Bibliography |
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IEC 60645-1:2017
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