FRI-100-1 Ultrasonic Microphone and Amplifier

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This ¼” Free-Field Microphone has been designed to Measure low level signals. The combination of our ultrasonic microphone and amplifier is 250 times greater than a G.R.A.S. or Bruel & Kjaer microphone and preamplifier (4 mv/Pascal vs. 1 volt/Pascal). From the factory we calibrate the FRI-100-1 to 10 dB less than 1 Volt/Pascal. This is equal to a G.R.A.S. ¼” microphone and preamplifier (46BF) and their sound module set to + 40 dB. Click here to download the FRI-100-1 User Manual