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BS 2497-5:1988

Withdrawn Date published:

Warning: Withdrawn Standard. This document has been replaced by:

Standard reference zero for the calibration of pure tone air conduction audiometers, Specification for a standard reference zero using an acoustic coupler complying with BS 4668

Reference equivalent threshold sound pressure levels for two earphones, Beyer DT 48 with flat cushion and Telephonics TDH 39 with MC 41/AR cushion, in a form suitable for calibration.

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BS 2497-5:1988

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