Type 40AZ

Type 40AZ
The G.R.A.S. ½″ Free-field microphone Type 40AZ is a precision condenser microphone for low-frequency (incl. infra-sound) measurements in open acoustic fields. It is a pre-polarized free-field microphone with a large dynamic range and a wide frequency response.
As a free-field microphone, Type 40AZ is designed essentially to measure the sound pressure as it would appear if the microphone were not present, the sound field pointing towards the microphone.
At low frequencies, the disturbing effects of its presence in the sound field are minimal (large wavelengths compared to the size of the microphone).
At higher frequencies (>1 kHz), the effects of diffractions generally cause microphones to measure sound pressure levels increasing with frequency.
Specifications Type 40AZ (WS2F)
Specifications Type 40AZ (WS2F)
50 mV/Pa
Dynamic range:
15 - 146 dB re. 20 µPa
Frequency range:
0.5 Hz - 20 kHz
Polarisation voltage:
0 V
Outside diameter (with protection grid):
13.2 mm
Length: (with and
16.2 mm
without protection grid):
15.3 mm
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