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270
different, resulting in high-frequency transient interruption at the junction. In the frequency domain, this
effect is called leakage. Therefore, to avoid leakage, the original waveform is multiplied by a window
function, forcing the values at the beginning and at the end to be zero.
Note: Signals with DC components or deviations can cause errors or deviations in the FFT waveform components.
AC coupling can be selected to reduce DC components.
Spectrum type
Select Line, the vertical axis reads V or A; select dB, the vertical axis reads dB. When the spectrum is linear, the
waveform is shown in Figure 9-4.
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