Bruel & Kjaer Artificial Mastoid 4930 in wooden case with accessories ., US $1,875.00 – Picture 0

Bruel & Kjaer Artificial Mastoid 4930 in wooden case with accessories ., US $1,875.00 – Picture 1

Bruel & Kjaer Artificial Mastoid 4930 in wooden case with accessories ., US $1,875.00 – Picture 2

Bruel & Kjaer Artificial Mastoid 4930 in wooden case with accessories ., US $1,875.00 – Picture 3

Bruel & Kjaer Artificial Mastoid 4930 in wooden case with accessories ., US $1,875.00 – Picture 4

Bruel & Kjaer Artificial Mastoid 4930 in wooden case with accessories ., US $1,875.00 – Picture 5

Bruel & Kjaer Artificial Mastoid 4930 In Wooden Case With Accessories .

US $1,875.00

San Tan Valley, Arizona, United States
Jun 9th

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Bruel & Kjaer Artificial Mastoid 4930 in wooden case with accessories . The 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 R 373 (1971) including revision, and meets the requirements of the British Standard BS 4009 (1975) and American National Standard ANSI S3.26-1981. The Artificial Mastoid consists of an inertial mass, simulating the human head, mounted on a base-plate by resilient plastic spacers which surround the securing-bolts. 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, which isolates the whole apparatus from external disturbances such as someone bumping the table during use, are all below 5 Hz, which is one-tenth of the low-frequency limit of the working range. The base-plate also carries a loading-arm and its associated supports. The function of this is to maintain the device to be calibrated reliably in position, pressing against the calibration surface of the Artificial Mastoid with a static force which can be adjusted between 2 and 8 N. A spring balance and level indicator are included to facilitate this adjustment. Artificial Mastoid — Type 4930 - Bruel & Kjaer Online Store

Condition:	Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. ...	Brand	BRUEL 7 KJAER
Model	4930