Ear Simulator Calibration System
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Air conduction systems for calibration of audiometers themselves require regular calibration, and IEC 60318 1:2009 now requires that the acoustic transfer impedance of artificial ears is measured and ratified against target values.
This system is used for calibrating ear simulators, which are subsequently used for the calibration of other audiometric calibration systems, such as pure tone audiometers. Ear simulator systems typically comprise of an IEC 60318-1 Artificial Ear or IEC 60318-3 Reference Coupler, a measurement microphone, and an analyser or sound level meter. The system is calibrated as a whole, allowing the reference level to be accurately set on audiometric test systems, and the ear simulator transfer impedance is tested separately for compliance with IEC 60318 1:2009.
Based on the latest measurement techniques, which were developed at NPL
Uncertainty in acoustic transfer impedance measurement is 0.3 dB
Uncertainty of calibration of overall system is 0.2 dB
Fully compliant with IEC 60318-1 and IEC 60318-3
System can be modified according to the requirements of the user
Supplied with full documentation, uncertainty analysis, and suggested measurement procedure
Training and support is provided by the scientists and developers