BS 2497-5:1988被替代
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
出版：British Standards Institution
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基本信息
标准编号： BS 2497-5:1988
发布时间：1988/2/29 0:00:00
标准类别：Standard
出版单位：British Standards Institution
标准页数：0
标准简介
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.
标准备注
© British Standards Institution 2013
替代本标准的新标准
等同采用的国际标准
ISO 389:1991 - Identical
