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Chapter 9 MATH and Reference
175
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 , the vertical axis reads V or A; select , the vertical axis reads dB. When the spectrum is linear, the
waveform is shown in Figure 9-4.
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