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T O P I C R E V I E W
a_user	Posted - 08/19/1998 : 2:57:00 PM When I use FFT to analyze a time series data, the phase angle plotted in the graph is not between -180 to 180 degree. How is the phase angle in FFT defined? Thanks a lot.
1 L A T E S T R E P L I E S (Newest First)
a_user	Posted - 08/19/1998 : 3:02:00 PM FFT Phase Angle - You must Unwrap Phase When you select, Analysis:FFT switch to the "Settings" tab of the FFT floating toolbar. You will see a series of check boxes. The default is to have all of these checked off. You must UNCHECK the box next to UNWRAP PHASE. You can then switch back to the "Operations" tab to run the FFT . This will give you the results you desire.

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