TYPE 4179

1-inch low noise microphone, 10 Hz to 10 kHz (+/-2dB), 200V polarization

Designed for measuring ultra-low sound pressure levels.

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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.

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
Polarization
Ext polarized
Polarization voltages
200 V
Pressure coefficient
-0.016 dB/kPa
Sensitivity
100 mV/Pa
TEDS UTID
Temperature coefficient
-0.004 db/ºC
Temperature range
-10 – 50 C
Venting
Side
Weight
gram
Sound field
Special
Input type
Classic
Microphone type
Low Noise