FOREWORD
1 Scope
2 Normative references
3 General conditions
3.1 General
3.2 Measurement conditions
4 Particular conditions
4.1 Pre-conditioning
4.2 Sound source
4.3 Measurement of sound pressure
4.4 Voltage measuring system
4.5 Acoustical environment
4.6 Methods of measuring frequency response
4.7 Overall accuracy
4.8 Graphical presentation of results
5 Type description (acoustical behaviour)
5.1 Principle of the transducer
5.2 Type of microphone
5.3 Type of directional response characteristics
6 Terminals and controls
6.1 Marking
6.2 Connectors and electrical interface values
7 Reference point and axis
7.1 Reference point
7.2 Reference axis
8 Rated power supply
8.1 Characteristic to be specified
8.2 Method of measurement
9 Electrical impedance
9.1 Internal impedance
9.2 Rated impedance
9.3 Minimum permitted load impedance
10 Sensitivity
10.1 General
10.2 Sensitivities with respect to acoustical
environment
10.3 Sensitivities with respect to nature of signal
11 Response
11.1 Frequency response
11.2 Effective frequency range
12 Directional characteristics
12.1 Directional pattern
12.2 Directivity index
12.3 Front-to-rear sensitivity index (0 degree -
180 degree)
12.4 Noise-cancelling index
12.5 Special characteristics for stereo microphones
13 Amplitude non-linearity
13.1 General
13.2 Total harmonic distortion
13.3 Harmonic distortion of the n[th] order (n = 2, 3,.)
13.4 Difference frequency distortion of second order
14 Limiting characteristics
14.1 Rated maximum permissible peak sound pressure
14.2 Overload sound pressure
15 Balance
15.1 Balance of the microphone output
15.2 Balance under working conditions
16 Equivalent sound pressure level due to inherent noise
16.1 Characteristic to be specified
16.2 Method of measurement
17 Ambient conditions
17.1 General
17.2 Pressure range
17.3 Temperature range
17.4 Relative humidity range
18 External influences
18.1 General
18.2 Equivalent sound pressure due to external
magnetic fields
18.3 Equivalent sound pressure due to mechanical
vibration
18.4 Equivalent sound pressure due to wind
18.5 Transient equivalent sound pressure due to
"pop" effect
18.6 Equivalent sound pressure due to electromagnetic
interference
18.7 Electrostatic discharge
19 Magnetic stray field
19.1 Characteristic to be specified
19.2 Method of measurement
20 Physical characteristics
20.1 Dimensions
20.2 Weight
20.3 Cables and connectors
21 Classification of the characteristics to be specified
21.1 General
21.2 Classification
Annex A (normative) - Sound insulation device
Annex B (informative) - Simplified procedure for
"pop" measurements
Bibliography