4.Advanced User Guidebook
Figure 4-29 Bartlett window
Notes for using FFT
Use the default dB scale for details of multiple frequencies, even if they
have very different amplitudes. Use the Vrms scale to compare
frequencies.
DC component or offset can cause incorrect magnitude values of FFT
waveform. 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.
What is Nyquist frequency?
The Nyquist frequency is the highest frequency that any real-time digitizing
oscilloscope can acquire without aliasing. This frequency is half of the sample
rate. Frequencies above the Nyquist frequency will be under sampled, which
causes aliasing. So, pay more attention to the relation between the frequency
being sampled and measured.
Use XY Format
Click to call up the menu panel. Click the XY softkey on panel to switch to
the ON or OFF state.
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