Artificial Mastoid Type 4930 enables accurate calibration and objective testing of bone conduction hearing aids, vibrators and vibration motors.
Artificial Mastoid Type 4930
Artificial Mastoid Type 4930 is a precision vibration transducer-based measurement device designed for the calibration and verification of bone conduction hearing aids, audiometric bone vibrators, and other bone vibration systems.
By accurately simulating the mechanical characteristics and impedance of the human mastoid, it provides a stable and repeatable reference for objective electroacoustic measurements.
The integrated force transducer continuously monitors the output of the device under test, enabling reliable and traceable calibration results.
Type 4930 complies with IEC 60318-6, the international standard for mechanical couplers used in bone conduction measurements.
Type 4930 provides an objective method for measuring the performance of bone conduction devices.
The system uses a carefully engineered inertial mass and compliant surface structure to reproduce the mechanical response of the human mastoid. When a bone vibrator or hearing aid is applied to the calibration surface, the built-in force transducer measures the transmitted vibration force. Combined with suitable instrumentation, you can determine vibration force, acceleration, velocity, displacement, frequency response, output levels, and mechanical impedance with high repeatability.
The supplied calibration data enables conversion between force and acceleration characteristics, supporting accurate and traceable assessments of bone conduction performance.
Artificial Mastoid Type 4930 integrates easily into advanced electroacoustic and vibration measurement systems.
The device features a standard miniature coaxial output connection and is compatible with HBK calibration solutions, including Impedance Head Type 8001 and Mini-shaker Type 4810.
Together, these components can form a complete calibration system capable of measuring force, acceleration, velocity, displacement, and mechanical impedance.
The adjustable loading arm, integrated force monitoring, and supplied calibration documentation simplify setup while ensuring repeatable and standardized test conditions across laboratories, development facilities, and production environments.
Bone Conduction: a method of transmitting sound through vibration of the skull bones directly to the inner ear, bypassing the outer and middle ear.
Artificial Mastoid: a standardized mechanical coupler that reproduces the vibration characteristics of the human mastoid to enable accurate testing and calibration of bone conduction devices.
Mechanical Impedance: the resistance of a mechanical system to vibration. Simulating human mastoid impedance helps ensure realistic and comparable measurement results.
Force Transducer: a sensor that converts mechanical force into an electrical signal, allowing precise measurement of vibration output during calibration and testing.
IEC 60318-6: an International Electrotechnical Commission standard defining the requirements for mechanical couplers used in measurements of bone conduction hearing devices and bone vibrators.
| Artificial Mastoid - Type 4930 | Data Sheets | English |
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