ISO 389-7 Acoustics — Reference zero for the calibration of audiometric equipment — Part 7: Reference threshold of hearing under free-field and diffuse-field listening conditions*, 2019-11-05 Update
ISO 8253-1 Acoustics - Audiometric test methods - Part 1: Pure-tone air and bone conduction audiometry*, 2010-11-01 Update
ISO 8253-2:2009 history
2009ISO 8253-2:2009 Acoustics - Audiometric test methods - Part 2: Sound field audiometry with pure-tone and narrow-band test signals
1992ISO 8253-2:1992 Acoustics; audiometric test methods; part 2: sound field audiometry with pure tone and narrow-band test signals