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AS/NZS ISO 8253.1:2019

[Current]

Acoustics — Audiometric test methods, Part 1: Pure-tone air and bone conduction audiometry

The objective of this Standard is to specify procedures and requirements for pure-tone air conduction and bone conduction threshold audiometry.
Published: 11/03/2019
Pages: 28
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 General aspects of audiometric measurements
4.1 General
4.2 Standard reference zero for the calibration of audiometric equipment
4.3 Requirements on audiometric equipment
4.4 Qualified tester
4.5 Test time
4.6 Conditions for audiometric test environments
4.7 Measurement uncertainty
5 Preparation and instruction of test subjects before audiometric testing and positioning of transducers
5.1 Preparation of test subjects
5.2 Instruction of test subjects
5.3 Placement of transducers
6 Air conduction hearing threshold level determinations using fixed-frequency audiometry
6.1 General
6.2 Manually controlled threshold determination
6.2.1 Presentation and interruption of test tones
6.2.2 Initial familiarization
6.2.3 Hearing threshold measurements with and without masking
6.2.3.1 General
6.2.3.2 Procedures for testing without masking
6.2.3.3 Procedures for testing with masking
6.2.4 Calculation of hearing threshold level
6.2.4.1 General
6.2.4.2 Determination when the ascending method has been used
6.2.4.3 Determination when the bracketing method has been used
6.3 Hearing threshold determination with an automatic recording audiometer
6.3.1 General
6.3.2 Presentation of test tone
6.3.3 Familiarization
6.3.4 Hearing threshold level measurements
6.3.5 Calculation of hearing threshold level
6.4 Computer-controlled threshold determination
7 Air conduction hearing threshold level determinations using sweep-frequency audiometry
7.1 General
7.2 Presentation of test tone
7.3 Familiarization
7.4 Hearing threshold level measurement
7.5 Calculation of hearing threshold level at a specified frequency
8 Bone conduction hearing threshold audiometry
8.1 Method of audiometry
8.2 Occlusion
8.3 Airborne sound radiation from the bone vibrator
8.4 Vibrotactile sensation
8.5 Procedures for testing with masking in bone conduction audiometry
9 Screening audiometry
9.1 General
9.2 Procedure for the screening test
9.2.1 General
9.2.2 Manually controlled screening test
9.2.3 Computer-controlled screening test
10 Audiograms
11 Permissible ambient noise
11.1 Permissible ambient noise for threshold determinations
11.2 Psycho-acoustic check on ambient noise
12 Maintenance and calibration of audiometric equipment
12.1 General
12.2 Intervals between checks
12.3 Stage A — Routine checking and subjective tests
12.3.1 General
12.3.2 Tests and checking procedures
12.3.2.1
12.3.2.2
12.3.2.3
12.3.2.4
12.3.2.5
12.3.2.6
12.3.2.7
12.3.2.8
12.3.2.9
12.3.2.10
12.4 Stage B — Periodic objective checks
12.5 Stage C — Basic calibration tests
Annex A
A.1 General
A.2 Model function
A.3 Input quantities
A.3.1 General
A.3.2 Determined hearing threshold level, LHT′
A.3.3 Audiometric equipment, δeq
A.3.4 Transducers and their fitting, δtr
A.3.5 Environmental conditions, δn
A.3.6 Masking noise, δm
A.3.7 Experience of the tester, δte
A.3.8 Responses of the test subject, δsu
A.3.9 Special measurement situations, δpr
A.4 Uncertainty budget
A.5 Combined and expanded uncertainty
A.6 Example
Bibliography
Cited references in this standard
Content history
[Superseded]
DR AS/NZS ISO 8253.1:2018

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