Standard
Track updates
AS/NZS 1270:2002
[Current]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
Pages: 30
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
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
3.2.4.1 General
3.2.4.2 Preliminary adjustments of earmuffs with overhead or multiposition bands
3.2.4.3 Preliminary adjustments of earmuffs with nape bands
3.2.4.4 Preliminary adjustment of earmuffs mounted on industrial safety helmets
3.2.4.5 First measurement of clamping force
3.2.5 Dry heat test
3.2.5.1 Procedure
3.2.5.2 Test conditions
3.2.6 Low temperature drop test
3.2.6.1 General
3.2.6.2 Headband earmuffs
3.2.6.3 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
4.2.2.1 Test signal sound field requirements
4.2.2.1.1 General
4.2.2.1.2 Uniformity
4.2.2.1.3 Directionality
4.2.2.2 Reverberation time
4.2.2.3 Background noise
4.2.3 Test equipment
4.2.3.1 Signal source
4.2.3.2 Dynamic range of test system
4.2.3.3 Distortion
4.2.3.4 Attenuator characteristics
4.2.3.5 Signal pulsing
4.2.3.6 Fitting noise
4.2.3.7 Head-positioning device
4.2.3.8 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
4.5.1.1 Test situation
4.5.1.2 Information on results
4.5.1.3 Positioning the subject
4.5.1.4 Number of open and occluded threshold measurements
4.5.1.5 Quiet period prior to first threshold determination
4.5.1.6 Practice sessions
4.5.2 Test method
4.5.2.1 General
4.5.2.2 Prior to entering the test room
4.5.2.3 Inside the test room
4.5.2.3.1 Quiet period prior to determining initial open-ear threshold of hearing
4.5.2.3.2 Fitting of hearing protector for test
4.5.2.4 Use of fitting noise
4.5.3 Re-determination of thresholds
4.5.3.1 General
4.5.3.2 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
[Superseded]
Acoustics — Hearing protectors — Part 3: Simplified method for the measurement of insertion loss of ear-muff type protectors for quality inspection purposes
ANSI S12.6
Methods for measuring the real-ear attenuation of hearing protectors
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