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Summary of Contents for GRAS 43AC
- Page 1 Instruction Manual GRAS 43AC Ear Simulator Kit 43AC, 43AC-S1, 43AC-S4 to 43AC-S7 LI0068 - 11 October 2019...
- 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
Assembly .................................5 Assembling the Test Jig ............................5 Calibration ..............................7 Level Calibration ..............................7 Frequency Calibration ............................9 Warranty, Service and Repair........................11 Calibration ................................11 Warranty .................................11 Service and Repairs ............................11 Instruction Manual GRAS 43AC Ear Simulator Kit | 3... -
Page 4: Introduction
Introduction The 43AC Ear Simulator Kit is a Test jig for measurements on hearing aids and insert-type ear- phones. Ear simulator, preamplifier and accessories are included. Spring-loaded clamp for holding earphone in place(not used in 43AC) Ear Simulator RA0052 Test Fig. -
Page 5: Assembly
Please note that the spring-loaded arm is part of the RA0052 Test Jig as delivered, but in the 43AC it is normally not used to hold the DUT when testing ITE and BTE transducers, and it can therefore be ignored. - Page 6 Ear-mould Simulator Fig. 3. Assembled and exploded views of the ear simulator itemizing user-serviceable accessories for testing earphones either coupled to the ear via tube inserts or placed in the ear Instruction Manual GRAS 43AC Ear Simulator Kit | 6...
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Page 7: Calibration
Fig. 5. Ear simulator ready for level calibration, with External Ear Canal and Union Nut. Important! Do not extract the microphone housed in the ear simulator since this would invalidate the factory calibration. Instruction Manual GRAS 43AC Ear Simulator Kit | 7... - Page 8 6) Switch the Pistonphone off and remove it from the ear simulator. Multifunction Sound Calibrator The 42AG fits directly onto the ear simulator. It automatically corrects for ambient calibration conditions. The correction factor is listed in Fig. 4 on page 7. Instruction Manual GRAS 43AC Ear Simulator Kit | 8...
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Page 9: Frequency Calibration
The assembled components are pushed into the coupler Fig. 8. Assembled and exploded views showing how the GR0434 is used when calibrating the ear simulator. 40BP and RA0086 are available from GRAS. Instruction Manual GRAS 43AC Ear Simulator Kit | 9... - Page 10 From signal generator To ear simulator Fig. 9. Block diagram of a complete set-up for calibration Fig. 10. Example of a calibration result using a swept tone Instruction Manual GRAS 43AC Ear Simulator Kit | 1 0...
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Page 11: Warranty, Service And Repair
2002/96/EC RoHS directive: 2002/95/EC GRAS Sound & Vibration continually strives to improve the quality of our products for our custom- ers; therefore, the specifications and accessories are subject to change. Instruction Manual GRAS 43AC Ear Simulator Kit | 1 1...
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