The Nor150 is in the standard version, optionally equipped with octave and 1/3rd octave filters.
The Nor150 octave and 1/3rd octave filters are digitally calculated.
The covered frequency range are 0.4 Hz to 20 kHz in 1/3rd octaves and 0.5 Hz to 16 kHz in octaves.
The operator can select the upper and lower frequency limits for the measurement. Reducing the range
will reduce the collected amount of data.
See
Filter standard for details.
Please note that the weighting networks always are measured with the full frequency range independant of the filter settings.