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