AS/NZS 1269.1:1998

1 - AS/NZS 1269.1:1998 OCCUPATIONAL NOISE MANAGEMENT - MEASUREMENT AND ASSESSMENT OF NOISE IMMISSION AND EXPOSURE
4 - PREFACE
5 - CONTENTS
6 - 1 SCOPE
6 - 2 REFERENCED DOCUMENTS
7 - 3 DEFINITIONS
7 - 3.1 A-weighted noise exposure
7 - 3.2 Eight-hour equivalent continuous A-weighted sound pressure level
8 - 3.3 Equivalent continuous weighted sound pressure level
8 - 3.4 Partial noise exposure
8 - 3.5 Peak sound pressure level
8 - 3.6 Reference sound source
8 - 3.7 Representative working day
8 - 3.8 Sound level or weighted sound pressure level
8 - 3.9 Sound pressure level (SPL)
9 - 3.10 Total daily noise exposure
9 - 4 MEASURES OF NOISE EMISSION, IMMISSION AND EXPOSURE
9 - 4.1 Measures of emission (of a source)
9 - 4.2 Measures of immission and exposure
9 - 4.2.1 General
9 - 4.2.2 Immission (at a location)
9 - 4.2.3 Exposure (of a person)
11 - 5 TYPES OF NOISE ASSESSMENT
11 - 5.1 Assessment of exposure to noise
11 - 5.1.1 General
11 - 5.1.2 Preliminary assessment
11 - 5.1.3 Detailed assessment
12 - 5.1.4 Follow-up assessment
12 - 5.2 Assessment for noise reduction
12 - 5.3 Assessment for personal hearing protector program
12 - 5.4 Assessment of noise exposure from headphones or insert earphones
12 - 6 INSTRUMENTATION AND CALIBRATION
12 - 6.1 General
13 - 6.2 Integrating-averaging sound level meter
13 - 6.3 Personal sound exposure meter (PSEM)
13 - 6.4 Non-integrating sound level meter
13 - 6.5 Instruments for the measurement of peak sound pressure level
13 - 6.6 Reference sound sources
13 - 6.7 Octave-band filters
13 - 6.8 Auxiliary instruments
14 - 6.9 Auxiliary equipment
14 - 6.10 Calibration
14 - 7 NOISE MEASUREMENT PROCEDURES
14 - 7.1 General
14 - 7.2 Field reference level checking
14 - 7.3 Procedures for assessment of noise exposure
14 - 7.3.1 General
14 - 7.3.2 Measurement of ...
15 - 7.3.3 Measurement of ...
15 - 7.3.4 Measurement of peak sound pressure level
15 - 7.3.5 Microphone locations
15 - 7.4 Measurement period
16 - 7.5 Measurement procedure for selection of hearing protectors
17 - 7.6 Frequency analysis
17 - 7.7 Infrasound and ultrasound
17 - 7.8 Noise measurements in hazardous environments
17 - 8 NOISE EVALUATION
17 - 8.1 Determination of E(A,T)
18 - 8.2 Determination of L(Aeq,T)
18 - 8.3 Determination of L(Aeq,8h)
18 - 8.4 Extended workshifts
19 - 8.5 Determination of L(Aeq,8h)n
19 - 8.6 Determination of L(norm)Aeq,8h
19 - 8.7 Noise exposure of groups
20 - 8.8 Assessment data to be recorded
20 - 9 CHECKLISTS
23 - APPENDIX A - COMPETENCY AND TRAINING OF PEOPLE UNDERTAKING DETAILED NOISE ASSESSMENTS
24 - APPENDIX B - TOPICS RECOMMENDED FOR INCLUSION IN A TRAINING COURSE FOR NOISE ASSESSMENT
24 - B1 GENERAL
24 - B2 BASIC ACOUSTICS
24 - B3 ANALYSIS OF SOUND WAVES
24 - B4 SOUND MEASUREMENT INSTRUMENTATION
25 - B5 NEED FOR NOISE CONTROL
25 - B6 EVALUATION OF NOISE
25 - B7 PRACTICAL NOISE ASSESSMENTS
25 - B8 OTHER NOISE MEASUREMENTS
25 - B9 NOISE REDUCTION
25 - B10 STATUTORY REQUIREMENTS AND GUIDANCE LITERATURE
26 - APPENDIX C - RECOMMENDED PROCEDURES FOR MEASUREMENT OF SOUND PRESSURE LEVELS FROM HEADPHONES OR INSERT EARPHONES
26 - C1 RECOMMENDED MEASUREMENT PROCEDURE
26 - C2 CONVERSION OF MEASURED LEVELS TO EQUIVALENT DIFFUSE FIELD LEVELS
26 - C3 ALTERNATIVE METHOD OF MEASUREMENT FOR HEADPHONES
27 - C4 PROBE-TUBE MICROPHONE MEASUREMENTS
27 - C5 FURTHER READING
28 - APPENDIX D - GENERAL INFORMATION ON AUXILIARY MEASURING DEVICES
28 - D1 AUXILIARY EQUIPMENT
28 - D2 GRAPHIC LEVEL RECORDER
28 - D3 TAPE RECORDER
28 - D3.1 General characteristics
28 - D3.2 Precautions when selecting or using a tape recorder
29 - D4 FREQUENCY SPECTRUM ANALYSER
29 - D5 SOLID STATE RECORDING INSTRUMENTATION
31 - APPENDIX E - PROCEDURE FOR DETERMINATION OF E(A,T), L(Aeq,T) AND L(Aeq,8h)
31 - E1 PARTIAL NOISE EXPOSURE
31 - E2 DETERMINATION OF E(A,T)
31 - E3 DETERMINATION OF L(Aeq,T)
31 - E4 DETERMINATION OF L(Aeq,8h)
32 - E5 DETERMINATION OF L(Aeq,8h)n.
32 - E6 DETERMINATION OF L(norm)Aeq,8h
32 - E7 EXAMPLES
32 - E7.1 General
33 - E7.2 CALCULATION USING TABLE E2
34 - E7.3 CALCULATIONS USING THE EQUATIONS IN CLAUSE 8
36 - E8 EXAMPLE OF CALCULATION OF AVERAGE DAILY NOISE EXPOSURE FOR 5 WORKING DAYS OF VARYING DAILY EXPOSURES TO NOISE
36 - E8.1 Example levels
36 - E8.2 Calculation using conversion Appendix F
37 - E8.3 Calculation using the equation in Clause 8.5
37 - E9 EXAMPLE OF CALCULATION OF NOISE EXPOSURE LEVEL NORMALIZED TO A FIVE DAY WORKING WEEK
37 - E9.1 Example levels
37 - E9.2 Calculation using conversion Appendix F
38 - E9.3 Calculation using the equation in Clause 8.6
39 - APPENDIX F - RELATIONSHIP BETWEEN L(Aeq,8h) AND E(A,T) VALUES
40 - APPENDIX G - NOISE ASSESSMENT REPORT PROFORMA

Describes the types of noise assessment which may be required in an occupational noise management program and the procedures and measuring instrumentation required to perform these assessments.

This Standard sets out requirements for and provides guidance on the types of noise assessments which may be necessary and suitable noise measuring instruments to carry them out. The procedures for noise measurement are also included. The type and detail of assessments carried out will depend on the use that is to be made of the information obtained. The type of measuring instruments and procedures to be used for the measurement of noise levels will depend on such factors as the type of workplace, type of noise, work patterns and information required. The general objectives of these assessments are as follows:(a) To determine the exposure to noise of all people likely to be exposed to excessive noise. For the purpose of this Standard, the exposure to noise of each person is established in terms of-(i) eight-hour equivalent continuous A-weighted sound pressure level (LAeq,8h) orA-weighted noise exposure (EA,T); and(ii) the peak sound pressure level (Lpeak).Exposure to noise is taken to be that determined at the person's ear position without taking into account any protection which may be afforded by personal hearing protectors.(b) To obtain more specific information that will help senior management decide what measures to take to reduce noise.(c) To check the effectiveness of any control measures which have been applied.(d) To assist in the selection of appropriate hearing protectors where other control measures are not practicable, or will take some time to plan and implement.

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 1269.1:1998.