Soft-db Opus Suite Data Logger Module Manuel d'utilisateur télécharger pdf (Page 32)

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.

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Soft-db Opus Suite Data Logger Module Manuel d'utilisateur Page 32