0 - 50 dB microphone 40PS-1

50 - 100 dB100 - 150 dB10 - 15 mV/Pa

Aeroacoustics Wind-tunnel applications Large arrays Design The GRAS 40PS-1 is a low-profile, light surface microphone for general purpose measurements on planar and curved surfaces within aeroacoustics, wind tunnel applications and large arrays. Its frequency range extends from 10 Hz to 12 kHz and its dynamic range is from below 27 dBA to 145 dB. It has an integrated CCP preamplifier with TEDS according to IEEE 1451.4 for remote identification and reading of calibrated sensitivity. It requires a constant-current power supply such as the GRAS 12AL 1-Channel CCP Power Module with A-weighting filter, or any other compatible constant-current power supply. Pressure equalisation is via a vent placed at the front of the microphone just by the side of its diaphragm. This makes it suitable for use in conditions with rapid static pressure changes, for example on aircraft or on road vehicles in mountainous country. 40PS-1 has an integrated 1,5 m coaxial cable with a Microdot connector. An adapter to BNC is included. It is delivered with a supple detachable silicon-rubber fairing and adhesive mounting pads. Because of its lightness, it contributes very little mass to thin plates. Together with any of the GRAS mountings, the profile of the surface microphone will not exceed 3 mm. Mounting Methods Depending on ambient wind-speeds, there are several methods of securing the Surface Microphone to its mounting point. When there is no wind, the microphone need only be secured in place using the double-sided adhesive pad (possibly trimmed to match the size of the microphone alone). For low wind speeds, e.g. on the side of a car include the Fairing.