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Difference between revisions of "NVGate FFT"
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* Filtered signal: This result is available if a filter is selected in the FFT x/Channel x/Input filter setting. It displays the input time signal after filtering. | * '''Filtered signal''': This result is available if a filter is selected in the FFT x/Channel x/Input filter setting. It displays the input time signal after filtering. | ||
* Triggered block: This displays the signal after being triggered by the event selected with the ''FFT x/Trigger/Trigger ''setting''.'' | * '''Triggered block''': This displays the signal after being triggered by the event selected with the ''FFT x/Trigger/Trigger ''setting''.'' | ||
''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)'' | ''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)'' | ||
[[Image:FFT_02.png|right|none]] | [[Image:FFT_02.png|right|none]] | ||
* '''Min level''': displays the maximal value of the signal. | |||
* '''Max level''': displays the minimal value of the signal. | |||
* '''Peak''': displays the absolute value of Min level and Max level. | |||
* '''Peak-Peak''': displays the difference between Min level and max level. Peak-Peak level ≥ 0. | |||
* Crest factor: displays the ratio Peak level/RMS level. Characteristics of the Crest Factor: | |||
* '''Crest factor''': displays the ratio Peak level/RMS level. Characteristics of the Crest Factor: | |||
* Crest Factor ≥ 1 | * Crest Factor ≥ 1 | ||
* DC level = 1 | * DC level = 1 | ||
* Crest Factor of sinus = [[Image:FFT_03.gif]] | * 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 | * Max level = [[Image:FFT_04.gif]] with N = number of samples in the triggered block = 2.56*lines number-1 | ||
* Avg. block: This result is available if the ''FFT x/Average/Domain ''setting value is Time. It the time signal block average. | * '''Avg. block''': This result is available if the ''FFT x/Average/Domain ''setting value is Time. It the time signal block average. | ||
* Weighted block: This result displays the signal after being weighted by the weighting window selected using the ''FFT x/Channel x/Weighting window'' setting. | * '''Weighted block''': This result displays the signal after being weighted by the weighting window selected using the ''FFT x/Channel x/Weighting window'' setting. | ||
* Spectrum: This result is available if the ''FFT x/Average/Domain ''setting value is Time. It displays the result of the FFT processing after time averaging. | * '''Spectrum''': This result is available if the ''FFT x/Average/Domain ''setting value is Time. It displays the result of the FFT processing after time averaging. | ||
* Inst. spectrum: This result is available if the ''FFT x/Average/Domain ''setting value is Spectral. It displays the FFT processing results. | * '''Inst. spectrum''': This result is available if the ''FFT x/Average/Domain ''setting value is Spectral. It displays the FFT processing results. | ||
* Avg. spectrum: This result is available if the ''FFT x/Average/Domain ''setting value is Spectral. It displays the instant spectrum average result. | * '''Avg. spectrum''': This result is available if the ''FFT x/Average/Domain ''setting value is Spectral. It displays the instant spectrum average result. | ||
* Order & Overall: It displays the result of the computation of the orders chosen with the ''FFT x/Channel x/Tracked order'' setting and the Overall level if the ''FFT x/Overall Analysis/Band power tracking '' is set to On. | * '''Order & Overall''': It displays the result of the computation of the orders chosen with the ''FFT x/Channel x/Tracked order'' setting and the Overall level if the ''FFT x/Overall Analysis/Band power tracking '' is set to On. | ||
* Inst. cross-spectrum: This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the cross spectrum between the 2 channels selected. | * '''Inst. cross-spectrum''': This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the cross spectrum between the 2 channels selected. | ||
* Avg. cross-spectrum: This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the instant cross spectrum average results. | * '''Avg. cross-spectrum''': This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the instant cross spectrum average results. | ||
* FRF H1: This result is not available if there is no cell checked in the matrix of the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the Frequency Response Function H1, see Appendix for details. | * '''FRF H1''': This result is not available if there is no cell checked in the matrix of the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the Frequency Response Function H1, see Appendix for details. | ||
* FRF H2: This result is not available if there is no cell checked in ''FFT x/FFT analysis/Cross spectrum ''setting. It displays the Frequency Response Function H2, see Appendix for details. | * '''FRF H2''': This result is not available if there is no cell checked in ''FFT x/FFT analysis/Cross spectrum ''setting. It displays the Frequency Response Function H2, see Appendix for details. | ||
* Coherence: This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the H1/H2 ratio. | * '''Coherence''': This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the H1/H2 ratio. | ||
* Order profile: It displays changes in the Order & Overall result. | * '''Order profile''': It displays changes in the Order & Overall result. | ||
* AutoCorrelation: This result is available if correlation is selected in ''the FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Time. | * '''AutoCorrelation''': This result is available if correlation is selected in ''the FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Time. | ||
* CrossCorrelation: This result is available if correlation is selected in ''the FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Time. This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix | * '''CrossCorrelation''': This result is available if correlation is selected in ''the FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Time. This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix | ||
* Inst. AutoCorr: This result is available if correlation is selected in ''the FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Spectral or Frequency synchronous. | * '''Inst. AutoCorr''': This result is available if correlation is selected in ''the FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Spectral or Frequency synchronous. | ||
* Avg. AutoCorr: This result is available if correlation is selected in ''the'' ''FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Spectral or Frequency synchronous. | * '''Avg. AutoCorr''': This result is available if correlation is selected in ''the'' ''FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Spectral or Frequency synchronous. | ||
* Inst. CrossCorr: This result is available if correlation is selected in ''the FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Spectral or Frequency synchronous. This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix | * '''Inst. CrossCorr''': This result is available if correlation is selected in ''the FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Spectral or Frequency synchronous. This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix | ||
* Avg. CrossCorr: This result is available if correlation is selected in ''the'' ''FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Spectral or Frequency synchronous. This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix | * '''Avg. CrossCorr''': This result is available if correlation is selected in ''the'' ''FFT x/Correlation ''and ''FFT x/Average/Domain ''setting value is Spectral or Frequency synchronous. This result is not available if there is no cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix | ||
* Zoomed spectrum: This result is available when the value of the ''FFT x/FFT zoom/Factor ''setting is different from None. It displays the FFT zoomed signal processing result. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''settings respectively. | * '''Zoomed spectrum''': This result is available when the value of the ''FFT x/FFT zoom/Factor ''setting is different from None. It displays the FFT zoomed signal processing result. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''settings respectively. | ||
* Zoomed avg. spectrum: This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None. It displays the zoom spectrum average result. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting respectively. | * '''Zoomed avg. spectrum''': This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None. It displays the zoom spectrum average result. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting respectively. | ||
* Lissajous: This result simultaneously displays the value of the channel chosen on the Y axis and the value of the reference channel on the X axis at the same time. | * '''Lissajous''': This result simultaneously displays the value of the channel chosen on the Y axis and the value of the reference channel on the X axis at the same time. | ||
* Cepstrum: This result is always available. X scale is in quefrency (time equivalent) and Y scale is always in dB. | * '''Cepstrum''': This result is always available. X scale is in quefrency (time equivalent) and Y scale is always in dB. ''Cepstrum analysis can be used as a tool for the detection of periodicity in a spectrum, for examples families of harmonics with uniform spacing. A high quefrency represents rapid fluctuations in the spectrum (small frequency spacings) and a low quefrency represents slow changes with quefrency (large frequency spacings). Note that the quefrency does not give information regarding absolute frequency, only about frequency spacings.'' | ||
Cepstrum analysis can be used as a tool for the detection of periodicity in a spectrum, for examples families of harmonics with uniform spacing. | |||
A high quefrency represents rapid fluctuations in the spectrum (small frequency spacings) and a low quefrency represents slow changes with quefrency (large frequency spacings). Note that the quefrency does not give information regarding absolute frequency, only about frequency spacings. | |||
* Zoomed cross-spectrum: This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None and if there is at least one cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the zoomed cross spectrum between the two channels selected. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting, respectively. | * '''Zoomed cross-spectrum''': This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None and if there is at least one cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the zoomed cross spectrum between the two channels selected. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting, respectively. | ||
* Zoomed avg. cross-spectrum: This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None and if there is at least one cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the zoomed cross spectrum average result. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting, respectively. | * '''Zoomed avg. cross-spectrum''': This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None and if there is at least one cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the zoomed cross spectrum average result. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting, respectively. | ||
* Zoomed FRF H1: This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None and if there is at least one cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the zoomed Frequency Response Function H1, see Appendix for details. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting, respectively. | * '''Zoomed FRF H1''': This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None and if there is at least one cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the zoomed Frequency Response Function H1, see Appendix for details. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting, respectively. | ||
* Zoomed FRF H2: This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None and if there is at least one cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the zoomed Frequency Response Function H2, see Appendix for details. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting, respectively. | * '''Zoomed FRF H2''': This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None and if there is at least one cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the zoomed Frequency Response Function H2, see Appendix for details. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting, respectively. | ||
* Zoomed Coherence: This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None and if there is at least one cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the zoomed H1/H2 ratio results. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting, respectively. | * '''Zoomed Coherence''': This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None and if there is at least one cell checked in the ''FFT x/FFT analysis/Cross spectrum ''matrix. It displays the zoomed H1/H2 ratio results. The minimum and maximum of the X axis are the values of the ''FFT x/FFT zoom/Min freq ''setting and ''FFT x/FFT zoom/Max freq ''setting, respectively. | ||
* Zoomed Cepstrum: This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None. It displays the zoomed cepstrum. | * '''Zoomed Cepstrum''': This result is available when the ''FFT x/FFT zoom/Factor value ''setting is different from None. It displays the zoomed cepstrum. | ||
'''Computation SPUs:''' | '''Computation SPUs:''' | ||