Bruel & Kjaer 4189-A-021 Free Field Microphone

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The Bruel & Kjaer 4189-A-021 Free Field Microphone is designed for high-precision, free-field measurements where a microphone with high sensitivity is required. Being pre-polarized, the Bruel & Kjaer 4189-A-021 Free Field Microphone can be used with both DeltaTron and classical preamplifiers. This device excels in tests or areas that require precision sound measurement, premium class sound level meters, and compliance with IEC 61672 class 1.

The Bruel & Kjaer 4189-A-021 Free Field Microphone is suited for high-precision acoustic measurements where a robust and stable free-field microphone with an upper frequency of 20 kHz is necessary. Assembled in clean rooms, this assures the microphone maintains its inherent low noise floor and high stability, even when used in environments with high humidity and/or temperature.

Sensitivity	50 mV/PA
Frequency	6.3 Hz -20 kHz
Dynamic Range	14.6 - 146 dB
Polarization	Prepolarized
Temperature Range	-30 to +150 °C (-22 to +302 °F)
Open Circuitry Sensitivity	50 mV/PA, -26 dB +/- 1.5 dB re 1 V/Pa
Thread for Pre-Amplifier Mounting	11.7 mm-60 UNS

Bruel & Kjaer 4189-A-021 Free Field Microphone

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