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G.R.A.S. 40AC 1/2" Ext. Polarized Free-field Microphone, High Frequency - 5 Pages

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Catalogue excerpts

G.R.A.S. 40AC 1/2" Ext. Polarized Free-field Microphone, High Frequency Date 10-06-2013. Page 1 of 5 G.R.A.S. 40AC 1/2" Ext. Polarized Free-field Microphone, High Frequency Sensitivity: 12.5 mV/Pa Freq resp: 3.15 Hz to 40 kHz Dynamic range: 20 dBA to 160 dB The 40AC is an IEC 61094 WS2F classified ½” externally polarized free-field, wide-frequency microphone with rear-venting. Introduction The 40AC is an IEC 61094 WS2F classified ½” externally polarized free-field, wide-frequency microphone with rear-venting. Read about the prepolarized equivalent 40AM. It is a high-precision condenser microphone made according to IEC 61094-4 requirements. The 40AC’s design is based on the original reference ½” pressure microphone, but optimized for free-field measurements. This results in a doubling of the upper 3 dB frequency limit. All other parameters remain unchanged, making 40AC the perfect free-field complement to the original G.R.A.S. 40AG ½” Ext. Polarized Pressure Microphone. 40AC is individually factory-calibrated and delivered with a calibration chart stating its specific open-circuit sensitivity, pressure, and corrected free-field frequency responses.

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G.R.A.S. 40AC 1/2" Ext. Polarized Free-field Microphone, High Frequency Date 10-06-2013. Page 2 of 5 The compact design and low sensitivity make 40AC extremely robust and stable. This, combined with its wide frequency range, makes it an all-round free-field microphone suitable for both field-work and precision laboratory measurements. It is also ideal as a working standard microphone in calibration laboratories that offer free-field calibration. Compatibility 40AC requires a standardized ½” or ¼” Lemo compatible preamplifier and an input module with a 7-pin Lemo connector that provides polarization...

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G.R.A.S. 40AC 1/2" Ext. Polarized Free-field Microphone, High Frequency Date 10-06-2013. Page 3 of 5 Depending on the use, measurement environment, and internal quality control programs, we recommend recalibrating the microphone at least once a year. Learn more about G.R.A.S.' calibration services. Specification Open-circuit sensitivity @ 250 Hz (±2 dB) Resonance frequency Dynamic range lower limit (microphone thermal noise) Dynamic range upper limit Dynamic lower limit with G.R.A.S. preamplifier Dynamic range upper limit with G.R.A.S. preamplifier @ ±14 V / +28 V power supply Dynamic range upper...

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G.R.A.S. 40AC 1/2" Ext. Polarized Free-field Microphone, High Frequency Date 10-06-2013. Page 4 of 5 Influence of axial vibration @1 m/s² CE/RoHS compliant, WEEE registered Weight

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G.R.A.S. 40AC 1/2" Ext. Polarized Free-field Microphone, High Frequency Date 10-06-2013. Page 5 of 5 Tradition Since the establishment in 1994, G.R.A.S. have been 100% dedicated to developing and manufacturing high-quality measurement microphones and related acoustic equipment. Founded by the Danish acoustics pioneer Gunnar Rasmussen who for more than 60 years has contributed to the world of sound and vibration with his unique ideas and designs. From the first reproducible 1” condenser measurement microphone that enabled quality measurements and instrumentation for acoustic calibration, Mr. Rasmussen’s...

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