12-5
IM DL850E-01EN
Window Function (Window)
• Damping Rate (Damping Rate)
You can configure this setting when Window is set to Exponential. You can set the value in the range of 1 to
100% (1% resolution). The weight of the last data point is used as a damping rate, with the weight of the first
data point of the FFT computation taken to be 100% (= 1). When the damping rate is set to 100%, the window
functions like a rectangular window. This setting applies to the input and output (response) signals.
• Force1
You can configure this setting when Window is set to Exponential. Set the area over which computation is
performed in terms of a percentage from the first FFT point, taking the number of FFT points to be 100%. Y
ou
can set the area to a value from 1 to 100% (in 1% steps). When the area is set to 100%, the window functions
like a rectangular window. The outer area is the average of the results of the window function for the data
outside the area. This setting applies to the input signals (first parameter) of one-waveform and two-waveform
FFTs.
•
Force2
You ca
n configure this setting when Window is set to Exponential. This setting applies to the output (response)
signal (second parameter) of a two-waveform FFT. It can be set in the same manner as Force1.
FFT computation data points
Damping
rate
(%)
Force (%)
100%
Weight
0
1
100%
Average (Average)
FFT analysis data can be linearly or exponentially averaged, and its peak values can be computed.
These settings are the same as those for user-defined computation.
12 FFT
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