Soft dB Opus Suite Data Logger Module - Manual (Page 32)

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At any time, the computation parameters can be changed and the recompute button can be used to
update the results.
The Do Graph Autoscale button allows adjusting the Y and X scales for the new data of the average
power spectrum graph.
The next table explains the computation parameters:
Computation
parameters
Description
This is the number of lines of the average power spectrum. The
selections are: 1024, 2048, 4096 or 8192 lines. The FFT calculation is
done with a block size of 2*Nbr Lines.
This is the time window used for the power spectrum computation.
This parameter allows adjusting the overlap between the time blocks
used for the average power spectrum calculation. This parameter can
be adjusted from 0% to 90%. This parameter is used to increase the
number of blocks for the average and to compensate for the loss of
data in the time window. The classic set-up is an overlap of 66% and the
Hanning window.