ISO 16:1975 Preview
Acoustics -- Standard tuning frequency (Standard musical pitch)
This standard was last reviewed and confirmed in 2017. Therefore this version remains current.
Specifies the frequency for the note A in the treble stave and shall be 440 Hz. Tuning and retuning shall be effected by instruments producing it within an accuracy of 0,5 Hz.
Buy this standard
A standard is reviewed every 5 years
Revisions / Corrigenda