BS EN 60645-1:2015
$167.15
Electroacoustics. Audiometric equipment – Equipment for pure-tone audiometry
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 38 |
This part of IEC 60645 specifies general requirements for audiometers and particular requirements for pure -tone audiometers designed for use in determining hearing threshold levels, relative to standard reference threshold levels established by means of psychoacoustic test methods.
The object of this sta ndard is to ensure:
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that tests of hearing in the frequency range 125 Hz to 16 000 Hz on a given human ear, performed with different audiometers which comply with this standard shall give substantially the same results;
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that the results obtained represent a valid comparison between the hearing of the ear tested and the reference threshold of hearing;
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that audiometers are classified according to the range of test signals they generate, according to the mode of operation or according to the complexity of the range of auditory functions they test.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 7 | English CONTENTS |
| 10 | INTRODUCTION |
| 11 | 1 Scope 2 Normative references |
| 12 | 3 Terms and definitions |
| 15 | 4 Requirements for specific types of fixed frequency audiometer Tables Table 1 – Minimum facilities for fixed-frequency audiometers |
| 16 | 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 |
| 17 | 5.5.2 Mains operation 5.5.3 Battery operation 5.5.4 Other power supplies 5.6 Electromagnetic compatibility 5.7 Unwanted sound 5.7.1 General 5.7.2 Unwanted sound from an earphone 5.7.3 Unwanted sound from a bone vibrator |
| 18 | 5.7.4 Unwanted sound radiated by an audiometer 5.8 Testing of automatic-recording audiometers 5.9 Interface connections 6 Test signals 6.1 Pure tones 6.1.1 Frequency range and hearing level range Table 2 – Minimum number of frequencies to be provided and the minimum rangeof values of hearing level for fixed frequency audiometers |
| 19 | 6.1.2 Frequency accuracy 6.1.3 Total harmonic distortion Table 3 – Minimum range of values of hearing level for EHF audiometers |
| 20 | 6.1.4 Rate of frequency change 6.2 Frequency modulation 6.3 External signal source 6.3.1 Signals 6.3.2 Frequency response Table 4 – Maximum permissible acoustic total harmonic distortion, for supra-aural, circumaural, insert earphones and bone vibrators |
| 21 | 6.3.3 Electrical sensitivity 6.3.4 Reference level for external signal source 6.3.5 Operator to subject speech communication 6.3.6 Subject to operator speech communication 6.4 Masking sound 6.4.1 General 6.4.2 Narrow-band noise |
| 22 | Table 5 – Narrow-band masking noise: upper and lower cut-off frequencies for a sound pressure spectrum density level of –3 dB referred to the level at the centre frequency of the band |
| 23 | 6.4.3 Other masking sound 7 Transducers 7.1 Type of transducers 7.2 Headband 7.3 Loudspeaker 8 Signal level control 8.1 Marking 8.2 Signal indicator |
| 24 | 8.3 Accuracy of sound pressure level and vibratory force level 8.4 Hearing level control 8.4.1 Manual audiometers 8.4.2 Automatic-recording audiometers 8.4.3 Accuracy of control |
| 25 | 8.5 Masking level control 8.5.1 General 8.5.2 Masking level 8.5.3 Accuracy of masking levels 8.5.4 Masking level range 8.6 Tone switching 8.6.1 Tone switch for manual audiometers 8.6.2 On/off ratio for manual audiometers |
| 26 | 8.6.3 Rise/fall times for manual audiometers 8.6.4 Automatic pulsed presentation |
| 27 | 8.6.5 Subject’s response time for automated test procedures 8.6.6 Subject’s response system 9 Reference tone 9.1 General 9.2 Frequencies Figure 1 – Rise/fall envelope of test tones |
| 28 | 9.3 Reference tone level control 9.3.1 Range 9.3.2 Intervals 9.3.3 Marking 9.3.4 Accuracy 9.3.5 Operation 10 Calibration |
| 29 | 11 Electrical output of test signals 12 Audiogram format Table 6 – Reference standards for obtaining audiometric zero Table 7 – Symbols for the graphical presentation of hearing threshold levels |
| 30 | 13 Test requirements to demonstrate conformity 13.1 General 13.2 Environmental conditions and power supply variation 13.3 Electromagnetic compatibility |
| 31 | 13.4 Unwanted sound 13.4.1 Unwanted sound from an earphone 13.4.2 Unwanted sound from a bone vibrator |
| 32 | 13.4.3 Unwanted sound radiated by an audiometer 13.5 Total harmonic distortion of test signals 13.6 Signal accuracy 13.6.1 Accuracy of sound pressure level and vibratory force level 13.6.2 Accuracy of hearing level control 13.7 Masking sound 13.7.1 Narrow-band noise |
| 33 | 13.7.2 Masking level 13.8 Headbands 13.8.1 General 13.8.2 Supra-aural and circumaural earphone headband 13.8.3 Bone vibrator headband 14 Maximum permitted expanded uncertainty of measurements Umax |
| 34 | 15 Marking and instruction manual 15.1 Marking 15.2 Instruction manual Table 8 – Values of Umax for basic measurements |
| 36 | Bibliography |
