This dialog allows to set up a new FFT (Fast Fourier Transformation). It is automatically invoked when starting a new FFT calculation either from the channel dialog or from the menu. You may see more details on calculations and a detailed explanation
of all supported calculation jobs here. |
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Selected Channels | This list shows all channels that are selected to be used with this calculation. This list is automatically filled when starting the calculation directly from the channel dialog window. The selected figure is calculated for each channel in this list and show separately in the channel dialog. |
Select Channels | This button switches the list of source channels to a list of all channels that are valid as input for this calculation. Use this list to add/remove channels from the list of source channels. |
Destination Channel | Defines a name under which the resulting FFT signal should be accessed and shown inside SBench 6. |
Destination File | Store to cache tries to use the internal cache to speed up write process. If there is not enough free space in the cache the data is stored to a temporary file.
Store always to file stores data automatically under this file name on each calculation run. If Autostore is checked the result of the calculation is stored to a new file each time the calculation runs. |
Window | Selects the weighting window that is executed prior to the FFT calculation. The window function allows you to scale the input time domain signal to avoid false FFT results by fractions of periods. |
Zero Padding | If this checkbox is selected, the source channels will be padded with zeroes until the selected length is reached. The FFT will then be calculated on the padded signal. This improves the X resolution of the calculated FFT. |
Result | Selects whether the amplitude, the phase or both shall be calculated. Depending on the selected entry some more settings are available (see below). |
Amplitude Y Scale | Selects different scaling modes for the amplitude of the FFT calculation. The amplitude can be scaled either linear (Voltage) or logarithmic using different references: dBFS will scale to the full scale signal, dBc to the carrier signal (largest peak in spectrum), dBm to 1mW and dBuV to 1 uV. Only available if Result is set to Amplitude or Amplitude and phase. |
Phase Y Scale | Selects different scaling modes for the phase of the FFT calculation. The phase can be scaled either as Rad (full circle = 2PI), as Degree (full circle = 360°) or as Gon (also known as Radiant or Neugrad, full circle = 400°). Only available if Result is set to Phase or Amplitude and phase. |
Calculation Area | Select the part of the signal that should be used for calculation of this figure: Complete takes all samples of the signal from the first to the last acquired sample. The calculation result is updated when doing a new acquisition. Current view runs the calculation across all samples of the signal that are currently visible in the display window. If the signal is moved inside the display or the zoom factor is changed the result will be re-calculated. Cursor only uses samples that are between cursor B and cursor A in the current display window. The result is updated as soon as the cursors are moved. Source Display defines the display whose cursor/visible area will be used. This is only available if Calculation Area is set to either Current View or Cursor. |
Keep in loop | If this option is checked the calculation is automatically updated if the source signal has changed or the calculation area changes. If it is not checked the result is calculated once and stays fixed afterwards. |
Add to displays | If this option is checked the newly generated FFT plot is automatically added to a matching FFT display. If no FFT display is yet available a newly generated display is automatically added showing this plot. |
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SBench 6 Documentation
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