PeakTech 1245 Operation Manual page 118

13.2. Notes for using FFT
* If desired, use the zoom feature to magnify the FFT waveform.
* Use the default dB scale to see a detailed view of multiple frequencies, even if they have very different
amplitudes. Use the Vrms scale to see an overall view of how all frequencies compare to each other.
* Signals that have a DC component or offset can cause incorrect FFT waveform component magnitude
values. To minimize the DC component, choose AC Coupling on the source signal.
* To reduce random noise and aliased components in repetitive or single-shot events, set the oscilloscope
acquisition mode to average.
Fig. 23 Hanning window
Fig. 23 Hanning Window
Fig. 24 Blackman window
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