EN 61094-2:2009

1 Scope
2 Normative references
3 Terms and definitions
4 Reference environmental conditions
5 Principles of pressure calibration by reciprocity
  5.1 General principles
      5.1.1 General
      5.1.2 General principles using three microphones
      5.1.3 General principles using two microphones
            and an auxiliary sound source
  5.2 Basic expressions
  5.3 Insert voltage technique
  5.4 Evaluation of the acoustic transfer impedance
  5.5 Heat-conduction correction
  5.6 Capillary tube correction
  5.7 Final expressions for the pressure sensitivity
      5.7.1 Method using three microphones
      5.7.2 Method using two microphones and
            an auxiliary sound source
6 Factors influencing the pressure sensitivity of
  microphones
  6.1 General
  6.2 Polarizing voltage
  6.3 Ground-shield reference configuration
  6.4 Pressure distribution over the diaphragm
  6.5 Dependence on environmental conditions
      6.5.1 Static pressure
      6.5.2 Temperature
      6.5.3 Humidity
      6.5.4 Transformation to reference environmental
            conditions
7 Calibration uncertainty components
  7.1 General
  7.2 Electrical transfer impedance
  7.3 Acoustic transfer impedance
      7.3.1 General
      7.3.2 Coupler properties
      7.3.3 Microphone parameters
  7.4 Imperfection of theory
  7.5 Uncertainty on pressure sensitivity level
Annex A (normative) - Heat conduction and viscous
        losses in a closed cavity
Annex B (normative) - Acoustic impedance of a
        capillary tube
Annex C (informative) - Examples of cylindrical couplers
        for calibration of microphones
Annex D (informative) - Environmental influence on the
        sensitivity of microphones
Annex E (informative) - Methods for determining
        microphone parameters
Annex F (informative) - Physical properties of humid air
Annex ZA (normative) - Normative references to international
         publications with their corresponding European
         publications