Preferred frequencies for acoustical measurements 2.4.3



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2.4.3 Preferred frequencies for acoustical measurements

To facilitate comparisons of measurements and data, a preferred geometric series of acoustical test frequencies has been adopted (see ISO 266:1975). The series, shown in the table, is based on a reference frequency of 1000 Hz and extends indefinitely above and below this frequency in octave and -octave intervals. In the case of bands of sound or noise, the frequencies listed should be the geometric centre frequencies of the bands.

Preferred frequencies/Hz	1/1 oct.	1/3 oct.	Preferred frequencies/Hz	1/1 oct.	1/3 oct.	Preferred frequencies/Hz	1/1 oct.	1/3 oct.

16	×	×	200		×	2 500		×
20		×	250	×	×	3 150		×
25		×	315		×	4 000	×	×
31.5	×	×	400		×	5 000		×
40		×	500	×	×	6 300		×
50		×	630		×	8 000	×	×
63	×	×	800		×	10 000		×
80		×	1000	×	×	12 500		×
100		×	1250		×	16 000	×	×
125	×	×	1600		×
160		×	2 000	×	×

Reference

ISO 266:1975 Acoustics–Preferred frequencies for measurements.

G.R.Torr

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