BS 2497-1:1968被替代
Specification for a reference zero for the calibration of pure-tone audiometers. Data for earphone coupler combinations maintained at certain standardizing laboratories
出版：British Standards Institution
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基本信息
标准编号： BS 2497-1:1968
发布时间：1968/9/20 0:00:00
标准类别：Standard
出版单位：British Standards Institution
标准页数：0
标准简介
Specifies a standard reference zero for the scale of hearing threshold level applicable to pure-tone audiometers.
标准备注
© British Standards Institution 2013
Replaces notes:
Replaces BS 2497:1954.
替代本标准的新标准
