GRAS 43AC User manual
Instruction Manual
Instruction Manual
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www.gras.dk
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Contents
Introduction ...................................................................................................................................................4
Assembly.........................................................................................................................................................5
Calibration ......................................................................................................................................................7
Warranty, Service and Repair................................................................................................................... 11
Warranty
Instruction Manual
Instruction Manual
Introduction
Fig. 1. Assembled 43AC Ear Simulator Kit
Delivered Items
Test Jig
Externally Polarized Congurations
Ear Simulator Preamplier
Prepolarized Congurations
Accessories
External Ear Canal
Union Nut
Optional Items - not included
For hearing aids using tube inserts or placed in the ear
For calibration
Instruction Manual
Assembly
Assembling the Test Jig
Caution! When attaching
position
Fig. 2. Exploded view of the user-serviceable components of the 43AC Ear Simulator Kit
Note
Instruction Manual
Assembling Accessories for Testing ITE and BTE Transducers
Union nut
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
Calibration
Level Calibration
Correction Factors
Correction factors
External Ear Canal Correction factor
Fig. 4. Correction factors for 42AA/AP Pistonphone and 42AG Multifunction Sound Calibrator
Union nut
housing
External
Fig. 5. Ear simulator ready for level calibration, with External Ear Canal and Union Nut.
Important!
Instruction Manual
Calibrating
Pistonphone
Entrance to
Collar
Fig. 6. Level calibration using a pistonphone
⅓
Multifunction Sound Calibrator
Instruction Manual
Frequency Calibration
Fig. 7. Assembled and exploded views of the coupler itemizing user-serviceable accessories for individual
calibration
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
lating a signal generator
To ear
Fig. 9. Block diagram of a complete set-up for calibration
Fig. 10. Example of a calibration result using a swept tone
Instruction Manual
Warranty, Service and Repair
Calibration
Warranty
Service and Repairs
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3
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