SS-EN-ISO-389-9 › Acoustics - Reference zero for the calibration of audiometric equipment - Part 9: Preferred test conditions for the determination of reference hearing threshold levels (ISO 389-9:2009)
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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.
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SS-EN ISO 389-9:2009
May 28, 2009
EN ISO 389-9:2009(IDT); ISO 389-9:2009(IDT)