Bruel & Kjaer (B&K) Type 4191 ½-INCH FREE-FIELD MICROPHONE, 3.15 HZ TO 40 KHZ

Description

The 4191 is designed for high-precision, free-field measurements where a wide bandwidth is required.
USE SCENARIOS
Precision measurements to 40 kHz
Premium class sound level meters
Equipment complying with IEC 61672 class 1
USE OF FREE-FIELD MICROPHONES
At higher frequencies reflections and diffractions causes a pressure increase in front of the diaphragm of a microphone. If not corrected for, this would result in an increased output voltage. A free-field optimisation means that the frequency response of the microphone has been designed in such a way that the free-field response at 0 degrees incidence is flat. This microphone is optimised for use with the protection grid in place.
Free-field microphones are commonly used for sound measurement in an anechoic chamber or far away from reflecting buildings, etc. Another area for free-field microphones is for general electroacoustic measurements like loudspeaker and microphone measurements.
With an upper frequency of 40 kHz, the 4191 is especially suited all high-precision electroacoustic measurements as well as general acoustic measurements where a robust and stable free-field microphone is required. Despite the 40 kHz upper frequency, this microphone is optimised to operate with the protection grid in place.
STABILITY
A press-fitted, stainless-steel diaphragm ensures superior long-term stability and mechanical robustness – The 4191 will withstand the 1 m drop test of IEC 60068-2-32.
Diameter:
1/2"
Dynamic range:
20 – 162 dB
Frequency range:
3.15 – 40000 Hz
For more information please see Bruel & Kjaer website.
Please note: Item is Brand New but was stored in locked cabinet for couple years as spares. Serial number may differ from pictured item.
If you have any issues please let me know right away and I will make it right. Thank you for your business