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Difference between revisions of "NVGate Marker"
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→Max
(→Peak) |
(→Max) |
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Warning, using nonhomogeneous weighting windows (i.e.: equivalent noise bandwidths are not the same) on FRF channels leads to incorrect peak interpolation and damping results. | Warning, using nonhomogeneous weighting windows (i.e.: equivalent noise bandwidths are not the same) on FRF channels leads to incorrect peak interpolation and damping results. | ||
====Max==== | ====Max marker==== | ||
* | * | ||
[[Image:Reports_Tools_Ribbons_460.png| | [[Image:Reports_Tools_Ribbons_460.png|40px|none]] Switch the cursor to add a set of maximum detection markers in the clicked graph. The max marker detects automatically the maximum in the spectra and waterfall X/Y sections. | ||
Computes and displays max values for the selected trace(s). | Computes and displays max values for the selected trace(s). | ||
A maximum is defined as a local maximum such that the variation in size of spectral density of ray, in relation to other local maximum surrounding it, is greater than a set threshold | A maximum is defined as a local maximum such that the variation in size of spectral density of ray, in relation to other local maximum surrounding it, is greater than a set threshold | ||
[[Image:Display_Graphs_Traces_148.png| | [[Image:Display_Graphs_Traces_148.png|500px|none]] | ||
'''Max marker properties''' | |||
[[Image:Display_Graphs_Traces_149.png| | [[Image:Display_Graphs_Traces_149.png|400px|none]] | ||
* Hystersis | * Hystersis | ||
[[Image:Display_Graphs_Traces_150.png| | [[Image:Display_Graphs_Traces_150.png|500px|none]] | ||
* Ignore under: Does not display the detected peak if the peak is under this value. In the example below, the "ignore under" value is –15 dB. | * Ignore under: Does not display the detected peak if the peak is under this value. In the example below, the "ignore under" value is –15 dB. | ||
[[Image:Display_Graphs_Traces_151.png| | [[Image:Display_Graphs_Traces_151.png|500px|none]] | ||
* Number of max: Number of max to be displayed. That will first display the greatest max. | * Number of max: Number of max to be displayed. That will first display the greatest max. | ||
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* X & Y: x and y interpolations are active. | * X & Y: x and y interpolations are active. | ||
[[Image:Display_Graphs_Traces_152.png| | [[Image:Display_Graphs_Traces_152.png|500px|none]] | ||
When the interpolation function is active, the interpolated value is preceded by a "i". | When the interpolation function is active, the interpolated value is preceded by a "i". | ||
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* Damping ratio damping ratio is calculated for each detected Maximum. The calculation is based on the Half-power-band-width method, where DR is the damping ratio: | * Damping ratio damping ratio is calculated for each detected Maximum. The calculation is based on the Half-power-band-width method, where DR is the damping ratio: | ||
[[Image:damping_ratio.png| | [[Image:damping_ratio.png|500px|none]] | ||
The calculation of the damping factor is activated through the marker properties or preferences. | The calculation of the damping factor is activated through the marker properties or preferences. | ||
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When it is activated an additional column is added in the corresponding marker table. The marker table can be saved in an MS Office document or simply copied and pasted. | When it is activated an additional column is added in the corresponding marker table. The marker table can be saved in an MS Office document or simply copied and pasted. | ||
[[Image:Display_Graphs_Traces_154.png| | [[Image:Display_Graphs_Traces_154.png|600px|none]] | ||
Warning, using nonhomogeneous weighting windows (i.e.: equivalent noise bandwidths are not the same) on FRF channels leads to incorrect peak interpolation and damping results. | Warning, using nonhomogeneous weighting windows (i.e.: equivalent noise bandwidths are not the same) on FRF channels leads to incorrect peak interpolation and damping results. | ||