Home >
Suppliers Companies
> Bruel and Kjaer EMS Inc. >
Products Acoustic Transducers > Microphones and preamplifiers > 4179 - 1-Inch Low Noise Microphone
Bruel and Kjaer EMS Inc.
4179 - 1-Inch Low Noise Microphone
|
Brüel & Kjær has developed the 1” Condenser Microphone Type 4179 and Microphone Preamplifier Type 2660 system for measuring ultra-low sound pressure levels.
Uses
• 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
Features
• Very low inherent noise floor of -2.5dB (A)
• Frequency response:
○ 14Hz to 4kHz +/- 1dB
○ 10Hz to 10kHz +/- 2dB
○ 7Hz to 12.5kHz +2, -3dB (with 2660)
• High sensitivity: 1 V/Pa
• Frequency response in accordance with IEC 651, Type 1
• Microphone individually calibrated
• Well-defined operating characteristics
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.
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.
Specification
Specification
