Related Manuals for G.R.A.S. 47AX
Summary of Contents for G.R.A.S. 47AX
- Page 1 Instruction Manual G.R.A.S. 1/2”, 1/4”, and 1/8” CCP Flush-mount microphone sets www.gras.dk LI0063 – 29 May 2015...
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Page 2: Revision History
Revision History Any feedback or questions about this document are welcome at gras@gras.dk. Revision Date Description 27 August 2014 First publication 29 May 2015 Section about dismounting added. Copyright Notice © 2014-15 G.R.A.S. Sound & Vibration A/S http://www.gras.dk Any technical documentation that is made available by G.R.A.S. is the copyrighted work of G.R.A.S. -
Page 3: Table Of Contents
Contents Introduction .................. 4 The Scope of this Manual ................4 Brief Description ..................4 General Handling Rules for Flush-mount Microphones ........5 Delivered items and Accessories ............6 Delivered Items ..................6 Optional Accessories – Mounting ..............7 Optional Accessories – Calibration ..............7 Mounting and Removal .............. -
Page 4: Introduction
Introduction The Scope of this Manual This manual describes how to mount the G.R.A.S 1/2”, 1/4” and 1/8” flush-mount microphone sets, how to connect them, and how to perform sensitivity and frequency calibration. Two mounting options are described: • Mounting with Adapter An adapter for each microphone size is available. -
Page 5: General Handling Rules For Flush-Mount Microphones
Applications for Flush-mount Measurement Microphones The G.R.A.S. line of flush-mount measurement microphones combines the high precision and reliability of G.R.A.S. measurement microphones with the need for fitting sensors into very confined spaces and narrow structures. With a height of less than 10 mm (0.4 inch) and thin coax connection, these acoustic sensors can be integrated into literally any design without sacrificing aerodynamic properties. -
Page 6: Delivered Items And Accessories
Microdot male connector. Standard cable length is 1.5 m (4.92 feet). All the microphones listed below can be ordered with customized cable length, e.g. 47AX-CL, where CL is the cable length in centimeters. For instance, if you wish to order with 25 m cable, you write 47BX-CL2500. -
Page 7: Optional Accessories - Mounting
Optional Accessories – Mounting Mounting Adapters Item Part Number Mounting Adapter for 1/2” Flush-mount Microphone Set RA0501 Mounting Adapter for 1/4” Flush-mount Microphone Set RA0502 Mounting Adapter for 1/8” Flush-mount Microphone Set RA0503 Removal Tool for 1/2” and 1/4” Flush-mount Microphone Sets RA0302 Optional Accessories –... -
Page 8: Mounting And Removal
Mounting and Removal General Information The procedure for mounting 1/2”, 1/4” and 1/8” flush-mount microphone sets is the same. The only difference is the dimensions of the mounting holes. The microphones are typically mounted without the microphone grid. Store the microphone grid for future use. - Page 9 Measures, 1/2” Flush-mount Dimensions for mounting without adapter Ø13.2 Ø11.9 Ø12.7 Ø18 Ø18 Dimensions for mounting with adapter Adapter Ø15 ± 0.1 O-ring for attaching the Glue only this surface Ø25 microphone set of the adapter to the adapter Minimum Ø32 Fig.
- Page 10 Measures, 1/4” Flush-mount Dimensions for mounting without adapter Ø5.9 Ø7 Ø6.35 Ø18 Ø18 Dimensions for mounting with adapter Ø8.5 ± 0.1 Adapter O-ring for attaching Glue only this surface the microphone set of the adapter Ø25 to the adapter Minimum Ø32 Fig.
- Page 11 Measures, 1/8” Flush-mount Dimensions for mounting without adapter Ø2.77 Ø3.49 Ø3.18 Ø12 Ø12 Dimensions for mounting with adapter Adapter Ø5.5 ± 0.1 O-ring for attaching Glue only this surface Ø20 the microphont of the adapter to the adapter Minimum Ø28 Fig.
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Page 12: Removal Of 1/2 Inch And 1/4 Inch Flush-Mount Microphone
Removal of 1/2 inch and 1/4 inch Flush-mount Microphones Once mounted, a flush-mount microphone can be difficult to remove. The G.R.A.S. RA0302 Removal Tool for 1/2 inch and 1/4 inch flush-mount microphones makes it possible to remove the microphone without damage to structure, microphone housing or cable. The removal tool holds the microphone housing with 8 claws, tightened and loosened by turning a knob, see Fig. -
Page 13: Powering & Connection - Ccp
Powering & Connection – CCP General Information The powering and connection is electrically exactly the same as for G.R.A.S. CCP standard microphone sets. A constant current input module that can deliver 4 mA and 24 V unloaded CCP voltage supply is required. If the constant current supply is lower, the capability of driving long cables is reduced and consequently the upper frequency is reduced. - Page 14 Microdot – BNC Item Part Number 3 m Microdot - BNC Cable (RG-174, 2.8 mm diam.) AA0070 10 m Microdot - BNC Cable (RG-174, 2.8 mm diam.) AA0072 Customized length Microdot - BNC Cable (RG-174, 2.8 mm diam.) AA0073-CL 3 m Microdot - BNC Cable, High Temp (Hi-Temp, 2 mm diam.) AA0018 10 m Microdot - BNC Cable, High Temp (Hi-Temp, 2 mm diam.) AA0062...
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Page 15: Calibration
Calibration Periodical Calibration All measurement microphones need periodical calibration for obtaining reliable results. How often depends on your requirements and on the environment the microphone sets are exposed to. We recommend at least one calibration per year. G.R.A.S. offers equipment for calibration as well as calibration services. -
Page 16: Specifications
Specifications Specifications are given on our website. Visit www.gras.dk Calibration, Warranty and Repair Calibration Before leaving the factory, all G.R.A.S. products are calibrated in a controlled laboratory environ- ment using traceable calibration equipment. A calibration card is included. In addition, the sensi- tivity data is stored in the TEDS memory. - Page 17 Manufactured to conform with: CE marking directive: 93/68/EEC WEEE directive: 2002/96/EC RoHS directive: 2002/95/EC G.R.A.S. Sound & Vibration continually strives to improve the quality of our products for our customers; therefore, the specifications and accessories are subject to change. LI0063 – Revision 29 May 2015...
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