Free-field Array Microphone GRAS 40PL-11 (10Hz-20kHz)

Typical applications and use

• Multi-channel measurements
• Sound-field analyses
• Sound-power measurements
• Concurrent spatial and transient measurements

Design

• Array microphones are designed to be mounted on large or small arrays. Such systems are typically used for measuring and locating noise sources, and here the phase match is important to get good accuracy in the measurements. An important characteristic of array microphones is that the microphones are phase-matched.
• 40PL-11 has a dynamic range from 33 dB(A) to 147dB peak, the upper limit is the peak value before visible clipping.
• It has an integrated CCP preamplifier and is delivered with a built-in TEDS chip which enables it to be programmed as a complete unit. The GRAS 40PL-11 requires a constant current power supply, e.g. the GRAS 12AL CCP Supply, or any other CCP compatible power supply.
• Close manufacturing tolerances together with the advantages of the TEDS chip provide the GRAS 40PL-11 with a high degree of interchangeability; a major advantage when used in multiples forming arrays and matrices.
• The low cost of the GRAS 40PL-11 is a key consideration when setting up measurements requiring a multiplicity of concurrent transient and spatial data.
• Calibrating the GRAS 40PL-11 with a GRAS pistonphone (GRAS 42AP is recommended) is as straightforward as calibrating any other GRAS 1/4-inch microphone.
• All GRAS microphones are individually checked and calibrated before leaving the factory. An individual calibration chart is supplied with each microphone.