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BS EN ISO 4869-3:2007

Current
Current

The latest, up-to-date edition.

Acoustics. Hearing protectors Measurement of insertion loss of ear-muff type protectors using an acoustic test fixture
Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

31-08-2007

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement principle
5 Measurement of the insertion loss of ear-muffs
6 Reporting of data
Annex A (informative) Use of the acoustic test fixture as a
                        directional microphone
Annex B (informative) Uncertainty of insertion loss measurements
ANNEX ZA (informative) Relationship between this International
                        Standard and the Essential Requirements
                        of EU Directive 89/686

Defines a method for measuring the insertion loss of ear-muff type hearing protectors using an acoustic test fixture.

This part of ISO4869 specifies a method for measuring the insertion loss of ear-muff type hearing protectors using an acoustic test fixture. The method is applicable to the investigation of production spreads of performance as part of type approval or certification procedures, and to the investigation of the change of performance with age. It is intended to ensure that ear-muff hearing protector samples submitted for subjective testing of attenuation according to ISO4869-1 have performances typical of the type.

The method specified in this part of ISO4869 is not applicable as the basic test for type approval. Performance data obtained by this method are not intended to be quoted as representing the real-ear sound attenuation of an ear-muff, nor the protection provided by the ear-muff.

For the testing of certain ear-muffs (such as those attached to safety helmets, or those with contoured ear-cups or ear-cushions, or supra-aural ear-muffs), the procedure described in this part of ISO4869 might need to be modified.

Committee
EH/1/1
DevelopmentNote
Supersedes BS EN 24869-3. (08/2007)
DocumentType
Standard
Pages
22
PublisherName
British Standards Institution
Status
Current
Supersedes

ISO/IEC Guide 98:1993 Guide to the expression of uncertainty in measurement (GUM)
IEC 61094-4:1995 Measurement microphones - Part 4: Specifications for working standard microphones
ISO 4869-1:1990 Acoustics Hearing protectors Part 1: Subjective method for the measurement of sound attenuation
IEC 60263:1982 Scales and sizes for plotting frequency characteristics and polar diagrams
ISO 48:2010 Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD)
IEC 61260:1995 Electroacoustics - Octave-band and fractional-octave-band filters

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