Setup dynamic parameters calculation


Dynamic parameters are calculated from a FFT signal. The calculation is used to examine the spectrum components of a signal. The results can be used to specify signal quality and to determine exact relation of signal parts.


Selected Channels This list shows all FFT channels that are selected to be used with this calculation. This list is automatically filled when starting the calcualtion directly from the channel dialog window. The selected dynamic params are calculated for each FFT channel in this list and shown separately in the info window
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.
Acquisitions for averaging The calculated figure may be averaged to get of rid of spurious components. By selecting an averaging factor higher than one the selected number of calculated results is averaged.
Number of Harmonics Selects the number of harmonics of the carrier frequency that are used for the calculation. By default 6 harmonics are used in the calculation.
Bin size +/- Defines the bin size around carrier and harmonics frequencies. If signal frequency and sampling frequency are synchronized the bin size can be set to 1. But if sampling frequency is asynchronous to signal frequency one needs to define a bin size to collect all spectrum components that belong to one frequency.
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 selected FFT 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 selected 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 calculation in the 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.

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SBench 6 Documentation