Table of Contents

FOREWORD
1 Scope
2 Normative references
3 Terms and definitions
4 Reference environmental conditions
5 Principles of free-field calibration by reciprocity
6 Factors influencing the free-field sensitivity
7 Calibration uncertainty components
Annex A (informative) - Values for the position of the
        acoustic centre
Annex B (normative) - Values of the air attenuation
        coefficient
Annex C (informative) - Environmental influence on the
        sensitivity of microphones
Annex D (informative) - Application of time selective
        techniques for removal of unwanted reflections
        and acoustic interference between microphones
Bibliography

Abstract

Describes a primary method of determining the complex free-field sensitivity of laboratory standard microphones so as to establish a reproducible and accurate basis for the measurement of sound pressure under free-field conditions.

General Product Information

Published
Document Type	Standard
Status	Current
Publisher	International Electrotechnical Committee
Pages
ISBN
Committee	TC 29
Supersedes	IEC 60486 : 1ED 74