Meggitt Announces Pre-Polarised Array Microphones

Meggitt has introduced array microphones for multichannel acoustic measurements and concurrent spatial and transient measurements in aerospace, automotive and test and measurement applications. Endevco models EM40PH and EM40PL are low-cost free-field pre-polarised array microphones that offer a wide frequency range of up to 20KHz. The model EM40PH is offered with a sensitivity of 50mV/Pa and a large dynamic range of up to 135dB, while the model EM40PL is offered with a low sensitivity of 10mV/Pa and a large dynamic range of up to 150dB.

Their durable design incorporates use of an SMB connector for ease of test setup assembly and integration with most data acquisition systems. Isotron (IEPE) capabilities allow Endevco array microphones to be used interchangeably with IEPE-type accelerometers within the same test setups. Isotron microphones have no additional power supply requirements when used within standard 2-20mA constant current powered systems.

Incorporation of TEDS technology allows a microphone to be recognised by any TEDS compatible input module, allowing an analyser to derive information about microphone type, serial number and sensitivity, which can then be read by the application software. Close manufacturing tolerances and TEDS capabilities provide models EM40PH and EM40PL with the advantage of a high degree of interchangeability within multiple array matrices.

Endevco models EM40PH and EM40PL are suitable for use in larger-channel count acoustic measurement applications, such as near-field acoustic holography; trending and frequency analysis; white goods testing; automotive and aerospace NVH; or as a lower-cost alternative to a Type 1 compliant microphone in general acoustic testing. Recommended accessories include the Endevco model EM42AA handheld pistonphone calibrator and the model 133 three-channel signal conditioner. All Endevco acoustic sensors and instrumentation are backed by a five-year product warranty.

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