BS EN 61094-3:2016

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
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications

Defines 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. Pertains to laboratory standard microphones meeting the requirements of IEC 61094-1.

This part of IEC61094 specifies 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, is applicable to laboratory standard microphones meeting the requirements of IEC61094‑1 , is intended for use by laboratories with highly experienced staff and specialized equipment. NOTE The calibration principle described in this part of IEC61094 is also applicable to working standard microphones, preferably used without their protection grid.