BS 2497-7:1988被替代
Standard reference zero for the calibration of pure tone air conduction audiometers. Specification for a standard reference zero at frequencies intermediate between those given in Parts 5 and 6 of BS 2497
出版：British Standards Institution
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基本信息
标准编号： BS 2497-7:1988
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 supplementary to those specified for earphones and couplers in Part 5 and for earphones and artificial ears in Part 6.
标准备注
© British Standards Institution 2013
替代本标准的新标准
