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1-inch Laboratory STD., Pressure Microphone Type 40EU0 pages
1-inch Laboratory STD., Pressure Microphone Type 40EU Product Data and Spcifications Typical applications m LS1P Rf驩rence microphone m Prcision reciprocity calibrations m Laboratory rf驩rence for secondary catibra-tion ofworking-standard microphones Fig. I 1-inch Pressure Microphone Type 4QEU The GRAS. Microphone Type40EU (Fig. 1) is a 1-inch laboratory-standard pressure microphone for use in couplers. It fulfills the requirements as a replacement for W- 610 microphones As a pressure microphone, the Type 40EU lias a flat pressure-frequency response over its entire working frequency range (sec Fig. 2). 1-inch to VS-inch Adapters (RA0017, RA0073) are available for using Type 40EU with GRA.S. VS-inch preamplifiers (sec scparale data sheets for Types 26AG, 26AH, 26AJ, 26AK and 26AM). Ail G.RAS. microphones comply with the spcifi舘cations of IEC 61094: Measurement Microphones, Part 2: Spcifications for laboratory standardmicrophones. Non-corrosivc, stainlcss matcrials arc used in man-ufacturing th魨se microphones to make them both robust and to witbstand corrosive environments. The Type 40EU is a linear rversible transduccr as required for prcision reciprocity calibrations. When carefully handled. it will retain its calibrated proper-lics for centuries to come. Ail G.R.A.S. microphones are guaranteed for 5 years and are individually checked and calibrated beforc leaving the factory. An individual calibration chart is supplied with each microphone. The Type 40EU is also supplied with a protective dust cap when not in use. Sp驩cifications Frequency response: Polarisation voltage: 2.6Hz-8kHz ........... ......... ±2.0dB 200V 4Hz-5kHz ........... ......... ±1.0dB Dynamic range: Nominal sensltivity (20 °C): Upper liuiii(3% distortion): 1 ■16(11» rc. 20 nPa 50mV/Pa Microphone thermal noise: 9.6dBA re. 20pPa 26dB re. I V/Pa Noiniual capacitance: Venting: Rcar vented Temprature range: S6pF -40°Cto + 150°C ...continued ovcrlcaf G.R.A.S. Sound & Vibration Skovlytoften 33 2840 IIollc. Dcnmark Tel +45 45 66 40 46 Fax +45 45 66 40 47 e-mail: gras@gras.dk www.gras.dk
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