Catalogs >
Endevco >
Endevco® model EM40PS low-profile surface microphone

Endevco® model EM40PS low-profile surface microphone
2Pages

Catalog excerpts

The Endevco surface microphone model EM40PS is a lowcost microphone for general purpose measurements on planar and curved surfaces exposed to slipstreams. Its wide audio frequency range extends from 20 Hz to 20 kHz (Fig.1) and its large dynamic is from below 30 dBA to 136 dB. It has an integrated Isotron® preamplifier with a built-in TEDS1 chip which enables the surface microphone as a whole to be programmed as a complete single unit. Close manufacturing tolerances together with the advantages of the TEDS chip, provide the model EM40PS with a high degree of interchangeability; a major advantage which excludes accounting for individual characteristics. The model EM40PS requires a constant-current power supply, eg. model 4416B. The model EM40PS is both stable and robust and has an integrated 3.3 ft (1 m) co-axial cable with a microdot connector. It is delivered with a supple detachable siliconrubber fairing. Because of its lightness, the model EM40PS: a) can be readily mounted with its fairing on surfaces using a double-sided adhesive pad b) contributes very little mass to thin plates Pressure equalization is via a vent placed at the front of the microphone just by the side of its diaphragm. This is important especially when used on aircraft and on road vehicles in mountainous country. Applications • Wind-induced noise on ground and airborne vehicles • Acoustic radiation from surfaces • Noise tests in wind tunnels • Comparing the external noise on a moving vehicle with its internal noise Features • Low sensitivity to base bending • Water-repellent grid • Dust protected • Built-in Isotron® preamplifier with TEDS1 • Low mass contribution to thin panels • Includes fairing, protection grid and mounting pads • Fairing affords near-flush mounting on curvilinear surfaces • Aluminium mounting plate available for screw mounting • Pistophone calibration • 5 mV/Pa sensitivity • 20 Hz to 20 kHz frequency range • < 30 dBA to 136 dB dynamic range • -20ºC to 80ºC working temperature (-4ºF to 176ºF) Endevco® model EM40PS Surface microphone Description 1 Transducer Electronic Data Sheet - as proposed by IEEE-P1451.4 cmyk

Open the catalog to page 1

Endevco® model EM40PS Surface microphone Specifications Values quoted for 23ºC and 4 mA supply Nominal sensitivity: at 250Hz 5 mV/Pa Frequency response: ±1 dB 100 Hz–3 kHz ±3 dB 20 Hz–10 kHz ±6 dB 20 Hz–20 kHz Upper limit of Dynamic range: Max. without clipping 136 dB re. 20 ìPa Lower limit of Dynamic range: Thermal noise < 30 dBA re. 20 ìPa Temperature range: -20°C to +80°C (-4°F to 176°F) Output impedance: < 50 Ù Output: Integral cable with coaxial microdot connector Cable: length: 1.5 m (60 in) diameter: 1.1 mm (0.04 in) Thickness: 2.8 mm (0.11 in) Diameter: With fairing 40 mm (1.58 in)...

Open the catalog to page 2