Periodical marker
Periodical markers are available for the following analysis types:
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Time signal (Acceleration)
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Time signal (Velocity)
Periodical markers are used to detect periodical characteristics in a time signal. In addition to the periodical main marker, which you can position on the X-axis by mouse or value input, you can enable multiple markers with a specified distance (period). Moreover, you can add sidebands for each periodical marker. The periodical marker is drawn as a dotted red line with a red triangle at the X-axis.
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Settings |
Description |
|---|---|
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S1 [s] |
Position of the periodical main marker on the X-axis [s] |
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No. |
Number of additional periodical markers with distance Period to the left and to the right side of the main marker |
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Period [s] |
Interval between the periodical markers |
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Frequency [Hz] |
Inverse period value |
Tip |
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When you click on the fields for Period or Frequency and then click on one of the detected defect frequencies in the kinematic grid, then the periodical markers will position according to this period or frequency. |
Harmonic marker
Harmonic markers are available for the following analysis types:
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FFT spectrum (Acceleration)
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FFT spectrum (Velocity)
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Envelope spectrum
The harmonic marker is used to identify possible harmonics (multiples) of a fundamental frequency. The presence of harmonics often provides information about the nature of mechanical damage or its characteristics. The harmonic marker is only available in the spectrum view and cannot be disabled. The position of the marker can either be entered manually under H1 position or moved directly to the desired position using the left mouse button. Additional sideband lines can also be used if necessary. The harmonic marker is drawn as a dotted red line with a red triangle at the X-axis.
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Settings |
Description |
|---|---|
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H1 position |
Time signal: Position of the sideband cursor in the X-axis in seconds [s] Spectrum: Position of the first harmonic marker on the X-axis [Hz/order] |
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Number of harmonic markers |
Number of harmonics or multiples of the frequency of H1 (fundamental frequency) |
Sidebands
The sidebands are available in the time signal analysis and in the spectrum analysis. The position of the symmetrical sideband lines can be determined by specifying the distance (period or frequency) in relation to the periodical or harmonic marker. Alternatively, you can move the sidebands with the mouse. The distance between the sidebands remains unchanged if you move the marker.
At least one periodical marker (No. ≥1] must be enabled in the time signal analysis, because sidebands in a time signal are only linked to periodical markers.
Sidebands are drawn as dotted green lines.
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Settings |
Description |
|---|---|
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Time signal Period [s] / frequency [Hz] |
Distance of sidebands to the periodical marker or between each other, given in seconds [s] or Hertz [Hz] |
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Spectrum Frequency [Hz] |
Distance of sidebands to the harmonicarker or between each other, given in Hertz [Hz] Distance between the individual sidebands in seconds [s] |
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No. |
Number of sidebands displayed to the left and right of the periodical or harmonic marker |
Difference marker
If the difference marker is turned on, a new Difference marker tab is displayed in the settings. The position of the marker can either be entered manually under D1 position or moved directly to the desired position using the left mouse button.The difference marker is drawn as a dotted green line with a green triangle at the X-axis.
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Settings |
Description |
|---|---|
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D1 position |
Position of the difference cursor in the X-axis in seconds [s/Hz/order] |
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Difference |
Distance between the sideband and difference cursor in seconds [s] |
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1/Diff |
The frequency [Hz] is calculated from the reciprocal of the difference. |