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resources:tools-software:ace:fftanalysis [16 Oct 2018 21:30] – [Setting the fundamentals] Matt McCarn | resources:tools-software:ace:fftanalysis [07 Jan 2019 22:21] (current) – [Setting Custom Spurs] Matt McCarn | ||
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==== Running Analysis and Viewing the Results ==== | ==== Running Analysis and Viewing the Results ==== | ||
- | The FFT can be run in "Run Once" or "Run Continous" | + | The FFT can be run in "Run Once" or "Run Continous" |
{{: | {{: | ||
==== Setting the fundamentals ==== | ==== Setting the fundamentals ==== | ||
- | There are three modes available for finding the fundamentals, | + | There are three modes available for finding the fundamentals, |
{{: | {{: | ||
- | - HighestBinFundamentalTones | + | - Highest Bin - Set the fundamentals to the highest spurs. This is the legacy behavior and a good |
default | default | ||
- | - MirrorImageFundamentalTones | + | - Mirror Image - Set spurs to the highest bin of the values in the Analysis Wizard and their mirror images. |
- | - FixedFundamentalTones | + | - Fixed - Set spurs locations in the Analysis Wizard. |
==== Adjusting Window and Spectral Leakage Compensation ==== | ==== Adjusting Window and Spectral Leakage Compensation ==== | ||
- | For non-coherent signals it is necessary to apply a windowing function, | + | For non-coherent signals it is necessary to apply a windowing function. However, windowing causes spectral spreading around the spurs, |
+ | |||
+ | {{: | ||
==== Two Tone Analysis ==== | ==== Two Tone Analysis ==== | ||
- | Two tone analysis will automatically find the two highest spurs and set them as fundamentals. The harmonics and inter-modulation distortion spurs will be found automatically. Only the spurs above the noise floor will be marked | + | Two tone analysis will automatically find the two highest spurs and set them as fundamentals. The harmonics and inter-modulation distortion spurs will be found automatically. Only the spurs above the noise floor will be marked. |
+ | |||
+ | {{: | ||
==== Averaging FFT ==== | ==== Averaging FFT ==== | ||
- | The FFT analysis can only be run in "Run Continuous" | + | The FFT analysis can only be run in "Run Continuous" |
+ | |||
+ | To save memory, you can de-select the Averaging FFT when it is not needed using the checkbox next to the AveragingFFT icon.{{: | ||
+ | |||
+ | ==== Setting Custom Spurs ==== | ||
+ | To open the dialog where you can add your own spurs to the analysis, click on the " | ||
+ | |||
+ | {{: | ||
+ | |||
+ | The spurs are separate for each type of FFT analysis available in the plug-in and can be focused by selecting the tabs on the left side of the dialog. There are several columns that can be used to describe the location and the way the analysis will handle the spur. | ||
+ | |||
+ | {{ : | ||
+ | |||
+ | === Frequency === | ||
+ | This can be a number entered in MHz or an equation that includes spur names. The names must be in the following format: | ||
+ | * Start with a " | ||
+ | * A " | ||
+ | * F | ||
+ | * The multiplier | ||
+ | Following these rules the first fundamental would be F1 and the second fundamental would be F2. You can use standard operations including " | ||
+ | |||
+ | Additional Examples: | ||
+ | * "F1 - 20" -> This is the first fundamental minus 20 MHz. | ||
+ | * "2F2 + 20" -> This is the second harmonic of the second fundamental plus 20 MHz. | ||
+ | * " | ||
+ | |||
+ | === Single Side Band === | ||
+ | If the Units setting is " | ||
+ | |||
+ | === Is Excluded From Noise === | ||
+ | If this box is checked, then the spur will be added to the FFT analysis, therefore affecting the calculation for noise and everything derived from it. If this box is unchecked, then the power of the spur will be reported, but it will not affect the other analysis results in any way. | ||
+ | |||
+ | === Is Enabled === | ||
+ | This will disable the spur if unchecked, so that the spur information can be saved, but not used in the next analysis. If there are no custom spurs defined or enabled, then the Worst Other spur will be reported, but if there are any custom spurs in the analysis, the Worst Other will not be reported because it is assumed that the user is taking control of what to measure in addition to the standard analysis. |