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Acoustics. Reference zero for the calibration of audiometric equipment - Reference threshold of hearing for test signals of short duration Ingestion-build-78747 This part of BS 60371 Scope This part of ISO 389 specifies reference hearing threshold levels for tests signals of short duration applicable to the calibration of audiometric equipment where such signals are used. NOTE 1 Some notes on different parameters and their effects on threshold levels are given in Annex A. NOTE 2 Preferred test conditions for determining hearing thresholds for standardization are specified in ISO 389 9.