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
ISO 389-9:2009 specifies test conditions for determining the hearing thresholds of subjects for the purpose of establishing standardized values for reference hearing threshold levels.
Life cycle
NOW
PUBLISHED ISO 389-9:2009 90.93
Standard confirmed Apr 9, 2020