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Summary of Contents for GRAS RA0056
- Page 1 Instruction Manual RA0056 Low-leak Pinna Simulator ITU-T Rec. P57 Type 3.2 RA0057 High-leak Pinna Simulator ITU-T Rec. P57 Type 3.2 RA0056 RA0057 High-leak Low-leak www.gras.dk LI0076 – 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 Low-leak Pinna Simulator RA0056 .............. 4 High-leak Pinna Simulator RA0057 ............. 4 Test Situation .................... 5 Calibration ................... 6 Warranty, Service and Repair ............7 Calibration ....................7 Warranty ....................7 Service and Repairs ..................7...
- Page 4 Both comply with the specifications given in: ITU-T Recommendation P .57 (12/11) “Series P: Terminals and Subjective and Objective Assess- ment Methods”. Low-leak Pinna Simulator RA0056 Use this for tests which simulate a telephone handset or earphone held comfortably against the listener’s ear.
- Page 5 RA0045 Simulated ear- Ear Simulator canal extension RA0057 RA0056 Low-leak High-leak Fig. 2. Showing the reverse sides of the Pinna Simulators Test Situation In a test situation, the Pinna Simulator (irrespective of which) should be placed centrally over the telephone handset or earphone as shown in Fig.
- Page 6 Set the analyser to either wide band or to the ⅓ octave band whose centre frequency is 250 Hz. When conditions are stable, note the reading in millivolts. For a microphone of nominal sensitivity (12.5 mV/Pa) and a nominal Pistonphone signal of 114 dB, an approximate value for the RA0056 Low-leak Pinna Simulator is: • 95 mV (representing a drop of ≈ 2.4 dB)
- Page 7 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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