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Measurement microphone 4179
monitoringcondenserexternally-polarized

measurement microphone
measurement microphone
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Characteristics

Applications
measurement, monitoring
Technology
condenser, externally-polarized, dynamic
Other characteristics
pressure, low-noise, 1", polarized

Description

1-INCH LOW NOISE MICROPHONE, 10 HZ TO 10 KHZ (+/-2DB), 200V POLARIZATION Designed for measuring ultra-low sound pressure levels. Brüel & Kjær has developed the 1” Condenser Microphone Type 4179 and Microphone Preamplifier Type 2660 system for measuring ultra-low sound pressure levels. USE SCENARIOS Hearing research Monitoring of very low background noise levels Sound Power measurement of very-low-level sources Distanced measurement of very-low-level compressor, fan or motor noise where close measurements are impaired by wind-induced noise High-quality, conventional 1” condenser microphones, such as B&K Types 4144 and 4145, and half-inch diameter Types 4189 and 4190, provide for the majority of noise measurements to IEC, ISO and ANSI standards. However, for measurements around the 20 μPA reference pressure, a very low noise floor in the 1/3-octave bands between 20 Hz and 20 kHz is needed. LOW NOISE FLOOR The microphone and preamplifier system, with a noise floor of typically -2,5dB(A), provides for this area without compomising the useful frequency range and omnidirectivity of a microphone intended for precision measurements. With narrow-band analysis, the noise floor falls to approximately -16dB for 1/3-octave bandwidth at 1 kHz, and -34dB for 3,16Hz bandwidth at 1 kHz. The system is thus well-suited to both laboratory and industrial applications ranging from hearing research to the measurement of very-low-level machine noise. Specifications Capacitance 40 pF Diameter 1 Dynamic range -2.5 – 102 dB Frequency range 10 – 10000 Hz Inherent noise -5.5 dB A Lower limiting frequency -3dB 7 Hz Optimised Low Noise

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