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All Norsonic microphones are free-field types.
A free field microphone is designed to measure the sound pressure in the sound field, compensating for the influence of the presence of the microphone in the sound field. In effect, the microphone measures the sound pressure as it existed before the microphone was introduced in the sound field, i.e. free-field conditions.
Applicable standard is IEC 61672 and the former IEC 60651. The free field microphone should be pointed towards the sound source at a 0° angle of incidence.
Specifications
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Cartridge size: ½” inch
Main standard: IEC 61672 Class 1
Polarisation voltage: 0 volt
IEC 61094-4 Designation: WS2F
Nominal sensitivity: 50 mV/Pa
Frequency response: ±1dB 20-10k Hz, ±3dB 12.5 – 16k Hz
Maximum SPL (3% dist): 146 dB
Self noise: 16 dB(A)
Capacitance: 16 pF
Temperature coeff. (250 Hz): <0.005 dB°C
Max. temperature: 80 °C
Static pressure coeff. (250 Hz): -0.004 dB/kPa
Relative humidity coeff. (no condens.): -0.003 dB/%
Diameter: 13.2 mm
Length: 17.3 mm
Weight: 9 g
