DS DS/EN ISO 389-9
DS DSEN SO 389-9 2009-JUN-26 Acoustcs - Reference zero for the calbraton of audometrc equpment - Part 9 Preferred test condtons for the determnaton of reference hearng threshold levels
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This part of ISO 389 specifies test conditions for determining the hearing thresholds of subjects for the purpose of establishing standardized values for reference hearing threshold levels.