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AS/NZS 1270:2002


Acoustics — Hearing protectors

Specifies requirements for the design, material and performance of conventional hearing protectors. Also provides guidance on the general requirements for specialist hearing protectors and procedures for the physical and acoustic testing of such devices.
Published: 18/01/2002
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Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope and general
1.1 Scope
1.2 Application
1.3 Referenced documents
1.4 Definitions
2 General requirements
2.1 Design and construction
2.1.1 General
2.1.2 Earmuffs
2.2 Materials
2.3 Wearer information
2.3.1 Information in or on the packaging
2.3.2 Information on the packaging
2.3.3 Information with each packaged pair of earplugs
2.4 Marking
3 Performance
3.1 Physical requirements
3.2 Test procedures
3.2.1 General
3.2.2 Examination
3.2.3 Preparation
3.2.4 Clamping force test General Preliminary adjustments of earmuffs with overhead or multiposition bands Preliminary adjustments of earmuffs with nape bands Preliminary adjustment of earmuffs mounted on industrial safety helmets First measurement of clamping force
3.2.5 Dry heat test Procedure Test conditions
3.2.6 Low temperature drop test General Headband earmuffs Helmet mounted earmuffs
3.2.7 Headband flexing
3.2.8 Cleaning
3.2.9 Second measurement of clamping force
3.2.10 Attenuation
4 Method for measurement of the real-ear attenuation of hearing protectors
4.1 Scope of section
4.2 Physical requirements of the test facility
4.2.1 Test signals
4.2.2 Test site Test signal sound field requirements General Uniformity Directionality Reverberation time Background noise
4.2.3 Test equipment Signal source Dynamic range of test system Distortion Attenuator characteristics Signal pulsing Fitting noise Head-positioning device Observation of subjects during testing
4.3 Test subjects
4.3.1 Conditions for subject acceptance/dismissal
4.3.2 Previous experience with hearing protectors
4.3.3 Anatomical features
4.3.4 Otoscopic inspection
4.3.5 Age
4.3.6 Sex
4.3.7 Maximum hearing levels
4.3.8 Minimum hearing levels
4.3.9 Threshold variability
4.3.10 Spectacles and jewellery
4.3.11 Literacy
4.3.12 Number of subjects
4.3.13 Maximum number of tests per subject
4.3.14 Exceptions
4.4 Product samples
4.4.1 General
4.4.2 Custom-moulded earplugs
4.4.3 Product instructions
4.4.4 Variable position headbands
4.5 Test procedure
4.5.1 Preliminary set-up Test situation Information on results Positioning the subject Number of open and occluded threshold measurements Quiet period prior to first threshold determination Practice sessions
4.5.2 Test method General Prior to entering the test room Inside the test room Quiet period prior to determining initial open-ear threshold of hearing Fitting of hearing protector for test Use of fitting noise
4.5.3 Re-determination of thresholds General Abnormal situations
4.6 Computation of real-ear attenuation
4.7 Computation of class of hearing protector
4.8 Test report
5 Testing of specialist and other devices
Appendix A
A1 General
A2 Calculation of SLC80
A3 Example of SLC80 calculation
A3.1 Step 1
A3.2 Step 2
A4 Determination of class
A5 Bibliography
Appendix B
B1 Scope
B2 Quality control tests
B3 Comparison with the original clamping force test value
Appendix C
Cited references in this standard
Acoustics — Audiometric test methods — Part 3: Speech audiometry
Acoustics — Glossary of terms and related symbols
prEN 13819.1
Hearing protectors—Testing, Part 1: Physical test methods
ANSI S12.6
Methods for measuring the real-ear attenuation of hearing protectors
Content history
DR 00244