1 Scope
2 Normative references
3 General conditions
3.1 General
3.2 Measurement conditions
3.2.1 Introduction
3.2.2 Rated 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
4.5.1 General
4.5.2 Free-field conditions
4.5.3 Diffuse-field conditions
4.5.4 Microphone coupled to a sound source by
means of a small cavity coupler
4.6 Methods of taking frequency response curves
4.6.1 Point-by-point or continuous sweep frequency
method
4.6.2 Calibration methods
4.7 Overall accuracy
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
9.1.1 Characteristic to be specified
9.1.2 Methods of measurement
9.2 Rated impedance
9.3 Minimum permitted load impedance
10 Sensitivity
10.1 General
10.2 Sensitivities with respect to acoustical environment
10.2.1 Free-field sensitivity
10.2.2 Diffuse-field sensitivity
10.2.3 Close-talking sensitivity
10.2.4 Pressure sensitivity
10.3 Sensitivities with respect to acoustical environment
10.3.1 Related sensitivity
10.3.2 Characteristic sensitivity for speech
11 Response
11.1 Frequency response
11.1.1 Characteristics to be specified
11.1.2 Method of measurement
11.2 Effective frequency range
11.2.1 Characteristic to be specified
11.2.2 Method of measurement
12 Directional characteristics
12.1 Directional pattern
12.1.1 Characteristic to be specified
12.1.2 Methods of measurement
12.2 Directivity index
12.2.1 Characteristic to be specified
12.2.2 Method of measurement
12.3 Front-to-rear sensitivity index (0 deg - 180 deg)
12.3.1 Characteristic to be specified
12.3.2 Method of measurement
13 Amplitude non-linearity
13.1 General
13.2 Total harmonic distortion
13.2.1 Characteristics to be specified
13.2.2 Method of measurement
13.3 Harmonic distortion of the nth order (N = 2.3.)
13.3.1 Characteristic to be specified
13.3.2 Method of measurement
13.4 Difference frequency distortion of second order
13.4.1 Characteristic to be specified
13.4.2 Method of measurement
14 Limiting characteristics
14.1 Rated maximum permissible peak sound pressure
14.2 Overload sound pressure
14.2.1 Characteristic to be specified
14.2.2 Method of measurement
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 Pressure range
17.2 Temperature range
17.3 Relative humidity range
18 External influences
18.1 General
18.1.1 Specification and measuring methods
18.1.2 Other external interferences
18.2 Equivalent sound pressure due to external magnetic
fields
18.2.1 Characteristic to be specified
18.2.2 Method of measurement
18.3 Equivalent sound pressure due to mechanical vibration
18.3.1 Characteristic to be specified
18.3.2 Method of measurement
18.4 Equivalent sound pressure due to wind
18.4.1 Characteristic to be specified
18.4.2 Method of measurement
18.5 Transient equivalent sound pressure due to "pop"
effort
18.5.1 Characteristic to be specified
18.5.2 Method of measurement
18.6 Equivalent sound pressure due to electromagnetic
interference
18.6.1 Characteristic to be specified
18.6.2 Method of measurement
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
Annexes
A Sound insulation device
B Simplified procedure for "pop"-measurements
C Bibliography