NEN EN ISO 4869-3 : 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.