70 Keysight InfiniiVision HD3-Series Oscilloscopes User's Guide
4 FFT Spectral Analysis
• "FFT Spectral Leakage" on page 73
• "Units for Math Waveforms" on page 78
• For more information on the use of FFTs please refer to Keysight Application
Note 243, The Fundamentals of Signal Analysis at
http://literature.cdn.keysight.com/litweb/pdf/5952-8898E.pdf. Additional
information can be obtained from Chapter 4 of the book Spectrum and Network
Measurements by Robert A. Witte.
Searching for FFT Peaks
With frequency domain waveforms, you can use the Search analysis feature
(Analyze > Search...) to search for frequency peaks.
In the Search dialog box with the Freq Peaks search selected, there are these
controls:
• Max # Peaks — Specifies the maximum number of FFT peaks to find.
• Threshold — Specifies the threshold level necessary to be considered a peak.
• Excursion — Specifies the amplitude above the FFT waveform's noise floor
necessary to be recognized as a peak.
Figure 5 Aliasing
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