New Random Incidence Response Microphone
Features Extended Frequency Capability

PCB Piezotronics, Inc., a world leader in vibration, acoustic, pressure, force, and torque sensors, introduces Model 377A21, a prepolarized, 1/2” Random Incidence (RI) response microphone. Operating from ICP® Sensor Power, this new microphone features an extended frequency capability. Applications include automobile and aerospace cabin testing, church hall and concert hall testing, environmental tests with sound level meters, and reverb chamber testing.

Most half inch RI Response microphones are limited to a maximum frequency of 12 kHz and can not be used in applications where the full audible range was required. PCB® model 377A21 has a linear frequency range of 4 Hz to 20,000 kHz (+/- 2 dB.) that eliminates this limitation. The 377A21 is specifically designed for applications where the user is looking to measure diffuse sounds, or the total sound coming from different locations. The 3% distortion factor of this microphone, which is the maximum amplitude that a microphone can measure and still be linear, was increased from 146 dB (re 20mPa.) to 155 dB. The increased amplitude, in combination with the low Noise Floor rating of 20 dB(A), make this microphone an excellent choice for specific Aerospace, Automotive and Military applications.

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