Artificial Mastoid Type 4930
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B R Ü E L & K JÆ R ® Vibration transducers Artificial Mastoid Type 4930 Artificial Mastoid Type 4930 has been designed for the calibration of bone conduction hearing aids and bone vibrators used in audiometry. It consists of a mechanical simulation of the human head, incorporating a built-in force transducer to monitor the output of the device to be calibrated. All the components of the artificial mastoid have been selected to ensure both excellent long-term stability and accurate correspondence with the mechanical characteristics of the human mastoid. It is designed in accordance with the International Electrotechnical Commission publication IEC 60318–6 from 2007 (formerly IEC R 373 and IEC 60373) and meets the requirements of the British Standard BS EN 60318–6 (2008). Uses and features Uses • Objective measurement of hearing aid and audiometer bone vibrator parameters • Frequency response and output determination of bone vibrators • Design and production testing and calibration of vibration motors • Measurement of bone conduction threshold values Features • Stable, reproducible simulation of the mechanical characteristics of the human head • Built-in force transducer with high-stability characteristic • Simulation of mechanical impedance of human mastoids • Adjustable static force from 2 N to 8 N from 50 Hz to 10 kHz • Compliant with IEC 60318–6 standard

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Description The artificial mastoid consists of an inertial mass, simulating the human head, mounted on a baseplate by resilient plastic spacers which surround the securing-bolts. The baseplate isolates the whole apparatus from external disturbances, such as someone bumping the table during use. The baseplate is carried on a suspension composed of three conical springs filled with foam rubber to provide damping. The natural frequencies of this suspension, are all below 5 Hz, which is one-tenth of the lowfrequency limit of the working range. The baseplate also carries a loading-arm and its...

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Fig. 2 Individual calibration chart as delivered with the artificial mastoid showing the force sensitivity, the accelerations sensitivity and the mechanical impedance as a function of frequency Artificial Mastoid Type 4930 Calibration Chart for Artificial Mastoid 0 Graph 1: Frequency Response for Acceleration sensitivity with constant acceleration (1.0 ms-2) Static Load: 5.4 N Acceleration Sensitivity (incl. cable) Charge: Voltage: Force Sensitivity (incl. cable) Charge: Voltage: Environmental condition: Air Temperature: Relative Humidity: Graph 2: Frequency Response for Force sensitivity...

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Transporting the Artificial Mastoid The artificial mastoid needs to be disassembled for transport, see Fig. 3: Fig. 3 The artificial mastoid shown disassembled in the transport case

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Compliance with standards The CE marking is the manufacturer's declaration that the product meets the requirements of the applicable EU directives RCM mark indicates compliance with applicable ACMA technical standards – that is, for telecommunications, radio communications, EMC and EME China RoHS mark indicates compliance with administrative measures on the control of pollution caused by electronic information products according to the Ministry of Information Industries of the People’s Republic of China WEEE mark indicates compliance with the EU WEEE Directive Safety EN/IEC 61010–1: Safety...

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