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签到天数: 12 天 连续签到: 1 天 [LV.3]偶尔看看II
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发表于 2010-1-3 07:24
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来自: 中国山东济南
下面是帮助文档中的一段话,原文:
Spectral Domain Plots in Transient (FFT)
When plotting in the spectral domain, you must specify the parameters for the Fast Fourier Transform
(FFT). The FFT function used by Maxwell uses windowing; therefore, the user must enter a
start and stop time within which the data is periodic.
To enter the FFT parameters:
1. In the Report window, be sure the Domain is set to Time.
2. In the Context section of the reporter dialog, click FFT Options.
The FFT Options dialog appears.
3. Enter the Start time for the window using the pull-down menu.
4. Enter the Stop time using the pull-down menu.
5. Enter the Window Type for the pull-down menu.
The Samples and number of points are calculated based on the chosen start and stop values. The
signal must be periodic during the time interval chosen or an error will result. |
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