G.R.A.S. 40BH 1/4" Ext. Polarized Pressure Microphone, High Pressure0 pages
G.R.A.S. 40BH 1/4" Ext. Polarized Pressure Microphone, High Pressure
Date 10-06-2013. Page 1 of 5
G.R.A.S. 40BH 1/4" Ext. Polarized Pressure
Microphone, High Pressure
Sensitivity: 0.4 mV/Pa
Freq resp: 10 Hz to 20 kHz
Dynamic range: 54 dBA to 194 dB
The 40BH is an IEC 61094 WS3P ¼"
externally polarized high-pressure microphone
with rear-venting. It is a high-precision Type 1
condenser microphone made according to IEC
61094-4 requirements. Its very low sensitivity
and wide frequency response make it ideal for
measuring very high sound pressure levels of up
to 194 dB. It is extremely robust and reliable
and can handle acoustic impulse measurements
in frequencies of up to 20 kHz.
Technology
Introduction
The 40BH is an IEC 61094 WS3P ¼" externally polarized high-pressure microphone with rear-venting.
40BH is a high-precision Type 1 condenser microphone made according to IEC 61094-4 requirements. Its
very low sensitivity and wide frequency response make it ideal for measuring very high sound pressure levels
of up to 194 dB. It is extremely robust and reliable and can handle acoustic impulse measurements in
frequencies of up to 20 kHz.
40BH is individually factory-calibrated and delivered with a calibration chart stating its specific open-circuit
Headquarters Skovlytoften 33 • DK-2840 Holte • Denmark • Tel: +45 45 66 40 46 • Fax: +45 45 66 40 47 • E-mail: gras@gras.dk • www.gras.dk
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