<![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 389-1:1998]]> /cms/render/live/en/sites/isoorg/contents/data/standard/03/04/30443.html Ïã¸ÛÁùºÏ²Ê¿ª½± standards and projects Ïã¸ÛÁùºÏ²Ê¿ª½±.org 60 /modules/isoorg-template/img/iso/favicon/red/favicon1.ico http://www.iso.org/ <![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 389-1:1998]]> <![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 389-1:1998 - Acoustics — Reference zero for the calibration of audiometric equipment — Part 1: Reference equivalent threshold sound pressure levels for pure tones and supra-aural earphones]]> /cms/render/live/en/sites/isoorg/contents/data/standard/03/04/30443.html /cms/render/live/en/sites/isoorg/contents/data/standard/03/04/30443.html 2017-12-13