BS 6840-4:1987
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
Sound system equipment Methods for specifying and measuring the characteristics of microphones
Hardcopy , PDF
12-15-1997
English
10-30-1987
National foreword
Committees responsible
1. Scope
2 Object
Section one. Conditions for specification and
measurement
3. General conditions
3.1 General
3.2 Rated and normal working conditions
4. Particular conditions
4.1 Pre-conditioning
4.2 Sound source
4.3 Standard microphone
4.4 Voltage measuring system
4.5 Acoustical environment
4.6 Methods of taking frequency response curves
4.7 Overall accuracy
Section two. Characteristics to be specified and the
relevant methods of measurement
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
7. Reference point and axis
7.1 Reference point
7.2 Reference axis
8. Power supply
8.1 Rated power supply
9. Electrical impedance
9.1 Internal impedance
9.2 Rated impedance
9.3 Rated 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. Output voltage
11.1 General
11.2 Rated output voltage
12. Response
12.1 Frequency response
12.2 Effective frequency range
13. Directional characteristics
13.1 Directional pattern
13.2 Front-to-random sensitivity index
13.3 Front-to-rear sensitivity index (0 deg - 180 deg)
13.4 Front-random to rear-random sensitivity index
13.5 Noise cancelling index
14. Limiting characteristics
14.1 Maximum safe peak sound pressure
14.2 Overload sound pressure
15. Noise
15.1 Rated equivalent sound pressure level due to
inherent noise
16. Ambient conditions for proper operation
16.1 Pressure range
16.2 Temperature range
16.3 Relative humidity range
17. External influences
17.1 General
17.2 Equivalent sound pressure due to external magnetic
fields of power supply frequency
17.3 Equivalent sound pressure due to mechanical
vibration
17.4 Equivalent sound pressure due to wind
18. Magnetic stray field
18.1 Interfering magnetic stray field
19. Physical characteristics
19.1 Dimensions
19.2 Weight
19.3 Cable assemblies
Section three. Classification
20. Classification of the characteristics to be
specified
20.1 General
20.2 Classification
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