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Quick Tips
If desired, use the zoom feature to magnify the FFT waveform.
Use the default dBV RMS scale to see a detailed view of multiple frequencies,
even if their amplitudes vary greatly. Use the linear RMS scale to see an overall
view of how frequencies compare.
Signals that have a DC component or an 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'.
NOTE 1:
Nyquist frequency: The highest frequency that a Real Time Digital Oscilloscope
can measure at exactly half the sampling rate is called the Nyquist frequency. If
under-sampling occurs when the frequency sampled is higher than the Nyquist
frequency, "False Wave" phenomenon will occur. The relationship between the
frequency being sampled and measured is of great importance in this context.
NOTE 2:
In FFT mode, the following settings are prohibited:
1) Window set
2) Changing the source channel (in CH1 Setup or CH2 Setup menu)
Fig.45 - Hamming window
72
V5.1 ‐ March 2010
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