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Chapter 9 MATH and Reference
267
Open FFT
1) Swipe up or down at the channel selection area to enter the second channel selection area. Tap the soft key
to open the math channel, left swipe to open math channel menu.
2) Tap spectrum type “Line/Decibel” to open the FFT window (see Figure 9-3 FFT Window).
3) Tap the Operation Source box to select the channel for which FFT transform is required.
4) Tap the window box to select the window function applied to the FFT input signal.
Selection of window function
In the FFT transform, four different FFT windows can be selected.
Each window is alternatively used between frequency resolution and amplitude accuracy, and the appropriate
window may be selected according to the characteristics of the following windows.
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