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BS 2497-7:1988

Withdrawn Date published:

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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

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.

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BS 2497-7:1988

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