Defines preferred frequencies for acoustical measurements, based on the R10 series of preferred numbers in ISO 3 and reference frequency of 1000 Hz.Does not include frequencies for music, all audiometric frequencies or series other than R10 from ISO 3. Nor does it apply when a constant frequency increment, or other particular spacing would be more suitable, or when the adoption or retention of other frequencies is preferable.

NBN EN ISO 266:1997 - Identical

I.S. EN ISO 266:1998 - Identical

UNI EN ISO 266:1998 - Identical

NF EN ISO 266:1997 - Identical

NS EN ISO 266 Ed. 1 (1997) - Identical

ISO 266:1997 - Identical

SS EN ISO 266 Ed. 1 (1997) - Identical

UNE EN ISO 266:1998 - Identical

NEN EN ISO 266:1997 - Identical

BS EN ISO 266:1997 - Identical

DIN EN ISO 266 (1997-08) - Identical

ONORM EN ISO 266:1997 - Identical