17.140.01
Acoustic measurements and noise abatement in general
Buying
Published
Scope
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.
Life cycle
NOW
PUBLISHED ISO 16:1975 90.93
Standard confirmed Sep 30, 2022