Cumulative Spectral Decay (CSD)

This mode is generated by computing the FFT of successively left-shifted versions of the windowed measurement data. The first slice is exactly the same as plotting the magnitude frequency response (Frequency Response/Spectrum plot type). This is because the FFT size and time window on the data is the same in General Frequency Domain Settings. (Push <Ctrl> + <w> to open the time window settings).The next slices are computed by shifting this window (successive slices are shifted). The size of the shift is specified in FFT Shift. The number of slices is determined by Cycles (number of slices). The computation does not stop if the end of the measurement is reached. The DC-component is removed from each slice. This is done by subtracting the DC-component of the last half of each slice.