AS/NZS 1270:1999

1 - AS/NZS 1270:1999 ACOUSTICS-HEARING PROTECTORS
4 - PREFACE
5 - CONTENTS
6 - SECTION 1 SCOPE AND GENERAL
6 - 1.1 SCOPE
6 - 1.2 APPLICATION
6 - 1.3 REFERENCED DOCUMENTS
6 - 1.4 DEFINITIONS
6 - 1.4.1 Acoustic helmet
6 - 1.4.2 Diffuse sound field
6 - 1.4.3 Disposable earplug
6 - 1.4.4 Ear canal cap
6 - 1.4.5 Earmuff
6 - 1.4.6 Earplug
6 - 1.4.7 Hearing protector
7 - 1.4.8 Occluded-ear threshold of hearing
7 - 1.4.9 Open-ear threshold of hearing
7 - 1.4.10 Pink noise
7 - 1.4.11 Real-ear attenuation
7 - 1.4.12 Reference point
7 - 1.4.13 Reverberation time
7 - 1.4.14 Suspension system
7 - 1.4.15 Test signal
7 - 1.4.16 Threshold of hearing
7 - 1.4.17 User formable earplug
8 - SECTION 2 GENERAL REQUIREMENTS
8 - 2.1 DESIGN AND CONSTRUCTION
8 - 2.1.1 General
8 - 2.1.2 Earmuffs
8 - 2.2 MATERIALS
8 - 2.3 WEARER INFORMATION
8 - 2.3.1 Information in or on the packaging
9 - 2.3.2 Information on the packaging
9 - 2.3.3 Information with each packaged pair of earplugs
9 - 2.4 MARKING
10 - SECTION 3 PERFORMANCE
10 - 3.1 PHYSICAL REQUIREMENTS
10 - 3.2 TEST PROCEDURES
10 - 3.2.1 General
10 - 3.2.2 Examination
10 - 3.2.3 Preparation
10 - 3.2.4 Clamping force test
12 - 3.2.5 Dry heat test
12 - 3.2.6 Low temperature drop test
13 - 3.2.7 Cleaning
13 - 3.2.8 Second measurement of clamping force
13 - 3.2.9 Attenuation
14 - SECTION 4 METHOD FOR MEASUREMENT OF THE REAL-EAR ATTENUATION OF HEARING PROTECTORS
14 - 4.1 SCOPE OF SECTION
14 - 4.2 PHYSICAL REQUIREMENTS OF THE TEST FACILITY
14 - 4.2.1 Test signals
14 - 4.2.2 Test site
17 - 4.2.3 Test equipment
18 - 4.3 TEST SUBJECTS
18 - 4.3.1 Conditions for subject acceptance/dismissal
18 - 4.3.2 Previous experience with hearing protectors
19 - 4.3.3 Anatomical features
19 - 4.3.4 Otoscopic inspection
19 - 4.3.5 Age
19 - 4.3.6 Sex
19 - 4.3.7 Maximum hearing levels
19 - 4.3.8 Minimum hearing levels
19 - 4.3.9 Threshold variability
19 - 4.3.10 Spectacles and jewellery
19 - 4.3.11 Literacy
20 - 4.3.12 Number of subjects
20 - 4.3.13 Maximum number of tests per subject
20 - 4.3.14 Exceptions
20 - 4.4 PRODUCT SAMPLES
20 - 4.4.1 General
20 - 4.4.2 Custom-moulded earplugs
20 - 4.4.3 Product instructions
20 - 4.4.4 Variable position headbands
20 - 4.5 TEST PROCEDURE
20 - 4.5.1 Preliminary set-up
21 - 4.5.2 Test method
23 - 4.5.3 Re-determination of thresholds
23 - 4.6 COMPUTATION OF REAL-EAR ATTENUATION
23 - 4.7 COMPUTATION OF CLASS OF HEARING PROTECTOR
24 - 4.8 TEST REPORT
25 - APPENDIX A - CALCULATION OF SLC80 AND CLASS OF HEARING PROTECTOR
25 - A1 GENERAL
25 - A2 CALCULATION OF SLC80
25 - A3 EXAMPLE OF SLC80 CALCULATION
25 - A3.1 Step 1
25 - A3.2 Step 2
26 - A4 DETERMINATION OF CLASS
26 - A5 BIBLIOGRAPHY
27 - APPENDIX B - QUALITY CONTROL TESTS
27 - B1 SCOPE
27 - B2 QUALITY CONTROL TESTS
27 - B3 COMPARISON WITH THE ORIGINAL CLAMPING FORCE TEST VALUE
28 - APPENDIX C - COUNTERBALANCING

Specifies requirements for the design, material and performance of hearing protectors, including a laboratory-based real-ear subjective method for determining the sound attenuation.

This Standard specifies requirements for the design, material, and performance of hearing protectors.

Under Revision see DR 00244 First published as AS 1270-1975.Second edition 1983.Third edition 1988.Jointly revised and designated as AS/NZS 1270:1999. First published as AS 1270-1975. Second edition 1983. Third edition 1988. Jointly revised and designated as AS/NZS 1270:1999.