Bruel & Kjaer TYPE 4176
½-inch free-field microphone, 6.5 Hz to 12.5 kHz, prepolarized
Type 4176 is a prepolarized ½" Free-field Microphone designed for accurate and reliable sound measurements, as required for sound level meters in accordance with IEC 61672 class 1 and ANSI S 1.4 Type 1.
CALIBRATION
The sensitivity of Type 4176 can be calibrated at 250 Hz using Pistonphone Type 4228 with Adaptor DP 0776, or at 1 kHz using Sound Level Calibrator Type 4231. Calibration in an extended frequency range is possible using Multifunction Acoustic Calibrator Type 4226.
Specifications
Capacitance 12.5 pF
Diameter 1/2
Dynamic range 14 – 142 dB
Frequency range 6.5 – 12500 Hz
Inherent noise 13.5 dB A
Lower limiting frequency -3dB 5 Hz
Optimised Free field
Polarization Prepolarized
Polarization voltages 0 V
Pressure coefficient -0.02 dB/kPa
Sensitivity 50 mV/Pa
Temperature coefficient -0.004 db/ºC
Temperature range -30 – 100 C
Venting Rear
Weight gram
Sound field Free-field
Input type Classic
Microphone type Free field
