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Summary of Contents for GRAS RA0039
- Page 1 Instruction Manual RA0039 Ear Simulator IEC 60318-1 www.gras.dk LI0074 – 28 September 2017...
- Page 2 Date Description 28 September 2017 Extracted from Earbook as separate document Any feedback or questions about this document are welcome at gras@gras.dk. Copyright Notice © 2005-17 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 Contents Introduction .................. 4 Components ....................4 Characteristics ................... 5 Warranty, Service and Repair ............6 Calibration ....................6 Warranty ....................6 Service and Repairs ..................6 LI0074 – 28 September 2017...
- Page 4 GR0338 Removable ring GR0402 GR0335 Removable Body of ring Ear Simulator Fig. 1. a) RA0039 Ear Simulator as delivered b) Exploded view of all the user-serviceable components of the RA0039 LI0074 – 28 September 2017...
- Page 5 Fig. 2. RA0039 lumped parameter model The absolute sensitivity of the RA0039 at 1kHz is given both as the Open Ear Sensitivity and the Closed Ear Sensitivity. The Open Ear Sensitivity is the ratio of the output signal from the pream- plifier to the input pressure signal at the ERP with open coupler.
- Page 6 Warranty, Service 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. We recommend a yearly recalibration at minimum, depending on the use, measurement environ- ment, and internal quality control programs. We recommend calibration prior to each use to ensure the accuracy of your measurements.
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