AS/NZS 1269.4:1998

1 - AS/NZS 1269.4:1988 OCCUPATIONAL NOISE MANAGEMENT - AUDITORY ASSESSMENT
4 - PREFACE
6 - CONTENTS
7 - FOREWORD
9 - 1 SCOPE
9 - 2 APPLICATION
9 - 3 REFERENCED DOCUMENTS
10 - 4 DEFINITIONS
10 - 4.1 Air conduction
10 - 4.2 Audiogram of a subject
10 - 4.3 Audiometric recording
10 - 4.4 Automatic recording audiometer
10 - 4.5 Computer-controlled audiometer
10 - 4.6 Hearing level
10 - 4.7 Hearing thresholdl evel
10 - 4.8 Manual audiometer
10 - 4.9 Pure tone audiometer
10 - 4.10 Significant threshold shift
10 - 5 AUDIOMETERS
10 - 5.1 General requirements
10 - 5.2 Specific requirements
10 - 5.2.1 Frequencies and sound pressure levels of test tones
11 - 5.2.2 Pulsing of test tones
11 - 5.2.3 Attenuation rate of automatic recording audiometers
11 - 5.3 Maintenance and calibration
11 - 5.3.1 General
11 - 5.3.2 Check procedures
11 - 5.3.3 Basic calibration
11 - 6 ACOUSTICAL ENVIRONMENT FOR AUDIOMETRY
11 - 6.1 General
11 - 6.2 Measurement of background noise level
12 - 6.3 Maximum acceptable background noise levels
12 - 7 AUDIOMETRY
12 - 7.1 General
13 - 7.2 Tester
13 - 7.3 Test subjects
13 - 7.4 Reference audiometry
14 - 7.5 Monitoring audiometry
14 - 7.6 Recording of results
14 - 7.6.1 General
14 - 7.6.2 Reference audiometry
15 - 7.6.3 Monitoring Audiometry
15 - 8 AUDIOMETRIC TEST PROCEDURES
15 - 8.1 General
15 - 8.2 Preparation for testing
15 - 8.3 Instruction of subject
16 - 8.4 Manual audiometry
17 - 8.5 Automatic recording audiometry
17 - 8.5.1 General
17 - 8.5.2 Familiarization
17 - 8.5.3 Hearing threshold level measurements
17 - 8.5.4 Determination of hearing threshold levels in automatic recording audiometry
18 - 8.6 Limitation of air-conduction threshold audiometry
18 - 8.7 Computer-controlled audiometry
18 - 9 ASSESSMENT OF AUDIOGRAMS
18 - 9.1 General
18 - 9.2 Reference audiometry
18 - 9.3 Monitoring audiograms
19 - 9.4 Action to be taken when threshold shift detected or new tinnitus reported
19 - 9.5 Updating of reference audiograms
19 - 9.6 Audiometric database analysis
19 - 10 CHECKLISTS
26 - APPENDIX A - IMPROVED AUDIOMETRIC TEST PROCEDURE
26 - A1 GENERAL
26 - A2 FURTHER READING
27 - APPENDIX B - GUIDELINES FOR ACOUSTIC MEASUREMENT OF AUDIOMETRIC TEST ENVIRONMENTS
27 - B1 GENERAL
27 - B2 TESTER
27 - B3 FREQUENCY OF TESTS
27 - B4 INSTRUMENTATION
27 - B5 MEASUREMENT PROCEDURE
27 - B5.1 General
27 - B5.2 Measurement of ambient noise level
28 - B5.3 Measurement of background noise level
28 - B5.4 Measurement of noise reduction in audiometric booths
29 - B6 ASSESSMENT PROCEDURE
29 - B6.1 Acceptability of audiometric test environments for various earphone combinations
29 - B6.2 Environment for fixed booths
29 - B6.3 Environment for mobile booths
29 - B7 REPORTING REQUIREMENTS
33 - APPENDIX C - MAXIMUM ACCEPTABLE BACKGROUND NOISE LEVELS FOR AUDIOMETRY
35 - APPENDIX D - COMPETENCY AND TRAINING OF AUDIOMETRISTS
36 - APPENDIX E - AUDIOMETRIC SYMBOLS FOR AUDIOGRAMS OBTAINED IN OCCUPATIONAL NOISE MANAGEMENT PROGRAMS
37 - APPENDIX F - ESTIMATED PREVALENCE OF NOISE-INDUCED HEARING IMPAIRMENT AND HEARING DISABILITY IN NOISE-EXPOSED POPULATIONS
37 - F1 HEARING IMPAIRMENT
37 - F2 HEARING DISABILITY
38 - F3 FURTHER READING

Provides requirements and procedures for conducting pure tone and conduction threshold audiometry used to monitor the hearing of individuals exposed to noise at work.

This Standard specifies procedures and requirements for air conduction pure tone audiometry without masking that are applicable to individuals whose hearing sensitivity might be adversely affected by occupational noise exposure.

First published in Australia as part of AS 1269-1976.
Second edition 1979.
Third edition 1983.
Fourth edition 1989.
Jointly revised and redesignated AS/NZS 1269.4:1998.