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Summary of Contents for GRAS 43AD
- Page 1 Instruction Manual 43AD Ear Simulator Kit According to ITU-T Rec. P57 Type 1 43AD-S1 Ear Simulator Kit According to ITU-T Rec. P57 Type 1, prepolarized www.gras.dk LI0069 – 1 June 2022...
- Page 2 Any technical documentation that is made available by GRAS is the copyrighted work of GRAS and is owned by GRAS. The content in this document is subject to change without notice. GRAS Sound & Vibration A/S is not liable or responsible for any errors or inaccuracies that may appear in this document.
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Page 3: Table Of Contents
Contents Introduction .................. 4 TEDS Compatibility ..................4 Components ....................4 Additional Equipment ................. 6 Test Procedure ................7 The 4 stages of the Test Procedure .............. 7 1: Setting up the Ear Simulator ..............7 3: Placing the Ear Simulator over the Earpiece/Earphone ........ 8 4: Applying the Test Signal and Analysing the Output from the Microphone .. -
Page 4: Introduction
ing apparatus: Artificial ears. The 43AD is acoustically similar to the 43AA. The main difference is that 43AD is quicker to use when testing is part of the production process (e.g. mobile phones). It can also be calibrated rapidly. - Page 5 ½" preamplifier Fig. 1. Assembled 43AD/43AD-S1 Ear Simulator Kit Fig. 2. 43AD shown with mounting plate GR0339 for testing earphones fitted with fluid cushions (circum-aural) Ground Loops In certain test set-ups, particularly if they are automated, there can be a risk of ground loops passing through the artificial ear and resulting in extraneous noise in the test results.
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Page 6: Additional Equipment
12AK Power Module Fig. 3. Block diagram of a complete set-up for making tests with the externally polarized 43AD. With the 43AD-S1, the 12AL or 12AQ Power module can be used, or you can connect directly to a CCP input of the analyzer. -
Page 7: Test Procedure
43AD-S1 Ear Simulator Kit, (with prepolarized microphone) A test set-up with the 43AD-S1 can be similar to that described above and shown in Fig. 3, except that a 12AL Power Module or 12AQ Power Module is used. Alternatively, the output from the 43AC-S1 can be fed directly into a CCP input of the analyzer/computer. -
Page 8: 3: Placing The Ear Simulator Over The Earpiece/Earphone
In production testing, this is normally automated. The 43AD must be centrally placed over the earpiece/earphone so that the sound is transmitted directly into the 43AD. See example in Fig. 6. Note. For circumaural earphones, use the concentric circles on the mounting plate GR0339 for guidance. -
Page 9: 4: Applying The Test Signal And Analysing The Output From The Microphone
4: Applying the Test Signal and Analysing the Output from the Microphone The following describes typical procedures for applying: a swept signal pink noise In both cases, it is assumed that the generator and analyzer work to produce constant-confidence results (i.e. maintaining a constant β T product) in real time throughout the frequency range of interest and make the measurement data available graphically and numerically. - Page 10 Snap Coupling 5 concerning (male) risk of ground loops ½" preamplifier 26AK (shown) or 26CB Fig. 7. Exploded view of all the user-serviceable components of the 43AD (mounting plates and extension cable omitted for clarity) LI0069 – 1 June 2022...
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Page 11: Warranty, Service And Repair
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. -
Page 12: Appendix
Appendix The RA0039 Ear Simulator IEC 60318-1 Introduction The RA0039 IEC 318 Ear Simulator uses a ½” microphone, e.g. the externally polarized G.R.A.S. 40AG or the prepolarized G.R.A.S 40AO. The artificial ear complies with the following international requirements: IEC 60318 Electroacoustics – Simulators of human head and ear - Part 1: Ear simulator for ... -
Page 13: Characteristics
Characteristics The acoustic input impedance of the RA0039 closely resembles that of the human ear and, as a result, loads a sound source in very much the same way. The RA0039 embodies a number of carefully designed volumes connected via well-defined and precisely tuned capillary tubes.
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