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Difference between revisions of "NVGate Waterfall"
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Note that: %Block lost <nowiki>+</nowiki> %Block transferred = 100%. | Note that: %Block lost <nowiki>+</nowiki> %Block transferred = 100%. | ||
=== | ==FAQ== | ||
===FFT1 Tach vs EXT synch tach=== | |||
'''What’s the different between Ord1 Tach. and Tach.Ext Ang speed?''' | |||
The waterfall and profile provide new capabilities that improve readability and accuracy: Tachometer centered on FFT/SOA blocks. | |||
This allows centering tachometer speed at the center of the FFT/SOA trigger block(s). It is useful with long trigger blocks (High resolution analyses) to perfectly match the actual data with the order cursor or section. | |||
With classical tach: | |||
The RPM is collected at the end of the analysis block. | |||
[[File:center.PNG|500px]] | |||
This situation leads to an offset in the waterfall calculation of the orders (cursors, sections). For a run up, as the angular speed is over evaluated, the order calculation is lower than the actual ones. | |||
With centered tach: | |||
The RPM is calculated as the average speed during the block duration to be synchronized with the analyzed data. | |||
[[File:ord_tach.PNG|500px]] | |||
With the centered tachometer, the orders calculations match more accurately the actual orders in waterfall. | |||
The computation of the angular speed takes in account the averaging, triggering and overlap used in the plug-in. | |||
The centered speed is calculated as: | |||
[[File:formula.PNG|400px]] | |||
The RPM centering and averaging is done in the analysis plug-in prior to be connected to the waterfall. To use the centered tach simply add the said tachometer to the corresponding plug-in (FFTn or SOAn). These additional tachometers are available in the waterfall as soon as one of the result of the plug-in is added to the waterfall. | |||
1. Add Tach to the Plug-in, | |||
2. Add plug-in results (Spectra, orders, etc..) to the waterfall, | |||
3. Display the waterfall, | |||
4. Select the Plug-in Tach, as a tachometer and reference | |||
[[File:fft_tach.PNG|400px]] | |||