9-14 IM 701450-01E
Selecting the Time Window
You can select the time window.
Rect (Rectangular)
Best suited for transient signals that attenuate completely within the time window.
Hanning
Best suited for continuous and non-periodic signals.
Flattop
Best suited for improving the accuracy of the level even if the frequency resolution is to be
compromised.
Effects of Linear Scaling
If linear scaling is performed on the channel to be computed, computation is performed
using the linearly scaled values and affects the level of the power spectrum computation
result.
Maximum Record Length That Can Be Computed
The operation is the same as for addition, subtraction, and multiplication. See section
9.2.
Note
• The power spectrum cannot be computed, if the displayed record length is less than number
of computed points. In addition, it cannot be computed when the number of data points after
the computation start point is less than the number of computed points.
• Power spectrum computation is performed on the data stored in the acquisition memory. For
waveforms acquired in envelope mode, computation is performed on the maximum and
minimum values per acquisition interval
9.6 Performing Power Spectrum Computation (FFT)
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