Soft dB I-Track User guide - Manual (Page 21)

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6.2.4 Advanced
The advanced parameters can be adjusted in this interface.
Delta t
The Delta t value sets the time interval between each acquired point. Therefore, the time signal
equivalent for this measurement point will be averaged over this time interval. As an example, a
0,125 s time interval means that 8 points per seconds will be acquired and each of them will
integrate the time signal on a 1/8 s duration.
When FFT is selected, an overlap of 66.6% is applied as a result of the Hanning windowing.
Therefore, a time interval of 0,125 s means that 24 points per second will be acquired and each of
them will integrate the time signal on a 1/8 s duration. Each point averaging period will overlap the
previous and next averaging period by 33.3%.