Acoustics. Reference zero for the calibration of audiometric equipment - Reference threshold of hearing for test signals of short duration Ingestion-build-78747 What is ISO 20023 -

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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 What is ISO 20023 -1 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.