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Meggitt Sensing Systems has launched a low-profile surface microphone, which is ideal for measuring wind-induced noise on ground and airborne vehicles and for wind-tunnel noise testing, for example.

The Endevco EM40PS model with integral Isotron (IEPE-type) amplifier and TEDS is designed to facilitate larger-channel-count acoustic measurements on typical planar and curved surfaces exposed to air slipstreams.

The design does not require any microphone holders or stands and incorporates a dust-free, water-repellent grid cap and a lightweight, detachable silicon rubber fairing, allowing for near-flush mounting on curvilinear surfaces and mounting pads.

Models also include an integral 3.3ft (1m) coaxial cable with a microdot connector.

Units offer a nominal sensitivity of 5mV/Pa at 250Hz, a wide audio frequency range from 20Hz to 20kHz and a large dynamic range from less than 30dBA to 136dB over an operating temperature range of -20C to +80C (-4F to +176F) with low sensitivity to base bending.

As a result of its lightness, the EM40PS contributes very little mass to thin plates and can be laid flat on its 2in-diameter rubber pad or surface mounted using a double-sided adhesive pad for automotive, aeronautical, general acoustics and sound pressure level testing requirements.

Pressure equalisation is via a vent placed at the front of the microphone by the side of its diaphragm, useful for both aircraft usage and on-road vehicle measurements in mountainous country.

Close manufacturing tolerances and the advantages of TEDS enable the microphone to offer a high degree of interchangeability, precluding the need for the accounting of individual characteristics, according to the company.

Recommended accessories for the Endevco EM40PS include the EM42AA handheld piston-phone calibrator; the 4416B constant-current power supply (2-20mA); and the 133 signal conditioner.

The Endevco EM40PS also provides acoustic radiation surface measurements and can make internal versus external noise measurement comparisons on moving vehicles.

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