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Measurement microphones - Part 7: Values for the difference between free-field and pressure sensitivity levels of laboratory standard microphones
Measurement microphones - Part 7: Values for the difference between free-field and pressure sensitivity levels of laboratory standard microphones.
This part of IEC 61094 gives a polynomial function derived from a least square fit to data from several laboratories, for the differences between free field and pressure sensitivity levels of laboratory standard microphones as specified in IEC 61094-1.
It enables determination of the free field sensitivity level of a laboratory standard microphone for zero degrees incidence in air by adding values of these differences to the pressure sensitivity level.
This part also gives tabulated values for the polynomial function for a range of frequency and temperature.
It is applicable when a suitable free field calibration is not available.
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