This standard was last reviewed and confirmed* in 2011.
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.
Document published on: 1975-01-01 Edition: 1 (Monolingual) ICS: 17.140.01 Status: Published Stage: 90.20 (2016-07-15) TC/SC: ISO/TC 43 Number of Pages: 1
This standard has not been revised
No corrigenda or amendments available