PCB Piezotronics, Inc. ICP MICROPHONE SYSTEM 378A21

Model 378A21 is a 1/2" prepolarized random incidence microphone designed for a wide range of acoustic measurements, with a frequency response from 4 Hz to 25 kHz (¬±2 dB) and a maximum sound pressure level of 150 dB at 3% distortion. It features an inherent noise level of 22 dB(A), making it suitable for applications such as cabin noise assessment in automobiles and aircraft, environmental noise monitoring, and room acoustics evaluation. This microphone is compliant with IEC 61672 Class 1 standards and is traceable to NIST, PTB, or DFM National Labs for calibration. The 378A21 operates on a 0V polarization voltage and requires a constant current supply of 2-20 mA, allowing for cost-effective integration with other ICP¬Æ compatible sensors. Its design corrects for its own presence in the sound field, ensuring accurate measurements in diffuse field conditions. The microphone is built to withstand harsh environments, with an operating temperature range of -40 to +248¬8F (-40 to +120¬8C). It is compatible with various preamplifiers and accessories, enhancing its versatility for different testing scenarios.