C–8
Appendix C
Figure C–4
Overall… Because of its versatility, FFT analysis has become a popular
analysis tool. However, some care must be taken with it. In most
instances, incorrect positioning of the signal within the display
grid will significantly alter the spectrum. Effects such as leakage
and aliasing that distort the spectrum must be understood if
meaningful conclusions are to be arrived at when using FFT.
An effective way to reduce these effects is to maximize the
acquisition record length. Record length directly conditions the
effective sampling rate of the scope and therefore determines
the frequency resolution and span at which spectral analysis can
be carried out.
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