Settling Time

When starting or resetting the filtering operation of fractional-octave filters, a settling time is required before the measurements are valid.

The settling time is related to the bandwidth of any particular filter. The lowest frequency band has the smallest bandwidth and defines the settling time required before you can consider the complete fractional-octave measurement valid. In the NI Sound and Vibration Measurement Suite, settling time is defined as five divided by the bandwidth of the filter used for the lowest frequency band.