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Difference between revisions of "NVGate FFT"
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{|class="wikitable" style="background:white" border="2" cellspacing="0" cellpadding="4" width="100%" align="center" | {|class="wikitable" style="background:white" border="2" cellspacing="0" cellpadding="4" width="100%" align="center" | ||
|'''Type''' | |'''Type''' | ||
|'''Description''' | |||
|'''Available if''' | |||
|'''Size''' | |'''Size''' | ||
|'''Dimension''' | |'''Dimension''' | ||
| Line 45: | Line 47: | ||
|- | |- | ||
|Filtered signal | |Filtered signal | ||
|Display the input time signal after filtering. | |||
|a filter is selected in the FFT x/Channel x/Input filter setting | |||
|256 pt | |256 pt | ||
|2D | |2D | ||
| Line 53: | Line 57: | ||
|- | |- | ||
|Triggered block | |Triggered block | ||
|Displays the signal after being triggered by the event selected with the ''FFT x/Trigger/Trigger ''setting''.'' | |||
| | |||
|(Resolution-1)*2,56 | |(Resolution-1)*2,56 | ||
|2D | |2D | ||
| Line 58: | Line 64: | ||
| Yes | | Yes | ||
| FFT | | FFT | ||
|}<br clear="all"> | |||
''Results below are calculated from the triggered block results. The refresh & computation rate depend on the PC to analyzer connection availability (non real-time results)'' | |||
{|class="wikitable" style="background:white" border="2" cellspacing="0" cellpadding="4" width="100%" align="center" | |||
|'''Type''' | |||
|'''Description''' | |||
|'''Available if''' | |||
|'''Size''' | |||
|'''Dimension''' | |||
|'''Domain''' | |||
|'''Save''' | |||
|'''Option''' | |||
|- | |- | ||
|Trigger Shaftview | |Trigger Shaftview | ||
| | |||
| | |||
|(Resolution-1)*2,56 | |(Resolution-1)*2,56 | ||
|2D | |2D | ||
| Line 85: | Line 107: | ||
|- | |- | ||
|Min level | |Min level | ||
|Displays the minimal value of the signal. | |||
| | |||
|1pt | |1pt | ||
|1D | |1D | ||
| Line 93: | Line 117: | ||
|- | |- | ||
|Max level | |Max level | ||
|Display the maximal value of the signal. | |||
| | |||
|1pt | |1pt | ||
|1D | |1D | ||
| Line 101: | Line 127: | ||
|- | |- | ||
|Peak | |Peak | ||
|Display the absolute value of Min level and Max level. | |||
| | |||
|1pt | |1pt | ||
|1D | |1D | ||
| Line 109: | Line 137: | ||
|- | |- | ||
|Peak-Peak | |Peak-Peak | ||
|Displays the difference between Min level and max level. Peak-Peak level ≥ 0. | |||
| | |||
|1pt | |1pt | ||
|1D | |1D | ||
| Line 117: | Line 147: | ||
|- | |- | ||
|Crest Factor | |Crest Factor | ||
|Display the ratio Peak level/RMS level. Characteristics of the Crest Factor: | |||
* Crest Factor ≥ 1 | |||
* DC level = 1 | |||
* Crest Factor of sinus = [[Image:FFT_03.gif]] | |||
* Max level = [[Image:FFT_04.gif]] with N = number of samples in the triggered block = 2.56*lines number-1 | |||
| | |||
|1pt | |1pt | ||
|2D | |2D | ||
| Line 125: | Line 161: | ||
|- | |- | ||
|Avg. block | |Avg. block | ||
|Display the time signal block average. | |||
|the ''FFT x/Average/Domain ''setting value is Time. | |||
|(Resolution-1)*2,56 | |(Resolution-1)*2,56 | ||
|2D | |2D | ||
| Line 133: | Line 171: | ||
|- | |- | ||
|Avg. Trigger Shaftview | |Avg. Trigger Shaftview | ||
| | |||
| | |||
|(Resolution-1)*2,56 | |(Resolution-1)*2,56 | ||
|2D | |2D | ||
| Line 141: | Line 181: | ||
|- | |- | ||
|Weighted block | |Weighted block | ||
|This result displays the signal after being weighted by the weighting window selected using the ''FFT x/Channel x/Weighting window'' setting. | |||
| | |||
|(Resolution-1)*2,56 | |(Resolution-1)*2,56 | ||
|2D | |2D | ||
| Line 149: | Line 191: | ||
|- | |- | ||
|Spectrum | |Spectrum | ||
|Display the result of the FFT processing after time averaging. | |||
|the ''FFT x/Average/Domain ''setting value is Time. | |||
|Resolution | |Resolution | ||
|2D | |2D | ||
| Line 157: | Line 201: | ||
|- | |- | ||
|Inst. spectrum | |Inst. spectrum | ||
|Displays the FFT processing results. | |||
|the ''FFT x/Average/Domain ''setting value is Spectral. | |||
|Resolution | |Resolution | ||
|2D | |2D | ||
| Line 165: | Line 211: | ||
|- | |- | ||
|Avg. spectrum | |Avg. spectrum | ||
|Displays the instant spectrum average result. | |||
|the ''FFT x/Average/Domain ''setting value is Spectral. | |||
|Resolution | |Resolution | ||
|2D | |2D | ||
| Line 173: | Line 221: | ||
|- | |- | ||
|Order & Overall | |Order & Overall | ||
|Displays the result of the computation of the orders chosen with the ''FFT x/Channel x/Tracked order'' setting and the Overall level. | |||
|the ''FFT x/Overall Analysis/Band power tracking '' is set to On. | |||
|1 pt | |1 pt | ||
|1D | |1D | ||
| Line 181: | Line 231: | ||
|- | |- | ||
|Inst. cross-spectrum | |Inst. cross-spectrum | ||
|Displays the cross spectrum between the 2 channels selected. | |||
|a cell is checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. | |||
|Resolution | |Resolution | ||
|2D | |2D | ||
| Line 189: | Line 241: | ||
|- | |- | ||
|Avg. cross-spectrum | |Avg. cross-spectrum | ||
|Displays the instant cross spectrum average results. | |||
|a cell is checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. | |||
|Resolution | |Resolution | ||
|2D | |2D | ||