SLWU087E november 2013 – june 2023
The Other Frequency Options menu has 3 features - Peak Analysis, Disable Fundamental Frequency Search, and Disable Harmonic Frequency Search, as shown in Figure 3-22.
When Peak Analysis is enabled, it finds the other peaks above the average noise floor (those other than fundamental, harmonics, and next spur) and marks them from "A" to "Z", based on the amplitude of the peaks. The threshold is set as n number of standard deviations above the noise floor and is shown as a horizontal line in the graph when enabled.
When Disable Fundamental Frequency Search is enabled, the GUI takes the user-provided Input Target Frequency as the location of the fundamental (and will not search the entire FFT for the fundamental). This option is typically used if there is a spur or harmonic frequency whose amplitude is greater than the actual signal frequency amplitude. By default, this selection is inactive, and the software searches the spectrum for the largest signal as the fundamental frequency.
When Disable Harmonic Frequency Search is enabled, the GUI no longer searches the entire FFT for harmonics. By default, this selection is inactive, and the software searches the spectrum to find four harmonics (HD2 - HD5).