Dataman 520 Series - Manual (Page 75)

DATAMAN oscilloscope
User’s Guide
Settings | Voltage mode | Effective – Voltage will represent effective voltage of
harmonic.
Settings | Stay on top – Activates/deactivates always on top mode for main window.
The following items control the inverse Fourier transformation (IFT). It is necessary
to activate IFT to use them.
Filter | Mode | Surpress noise – The harmonics with a level higher than the threshold
will be used for inverse Fourier transformation.
Filter | Mode | Simple – Inverse Fourier transformation is calculated from selected
harmonics. Hold ctrl and click on the harmonic to select/deselect it. Hold shift and
double click on the screen to select/deselect all harmonics.
Filter | Mode | Complex – The harmonics are modified by a filter specified before IFT
calculation. Therefore, the result represents the input waveform passing through the
specified filter. You can specify the filter by clicking on the item in the main menu.
Filter | Algorithm | FFT – Data will be transformed by the inverse fast Fourier
transformation.
Filter | Algorithm | DFT – Data will be transformed by the inverse discrete Fourier
transformation.
WARNING: The inverse FFT algorithm has a negative effect on the waveform
quality. To achieve best results, use DFT on both transformations (inverse
Fourier transformation and Fourier transformation).
Filter | FFT Quality | Normal – Sets normal quality of the inverse FFT.
Filter | FFT Quality | High – Sets high quality of the inverse FFT.
Filter | FFT Quality | Very high – Sets very high quality of the inverse FFT.
WARNING: Inverse FFT quality settings affect only inverse Fourier
transformation. Change the parameters of the Fourier transformation to
eliminate errors caused by the Fourier transformation.
Filter | Configure complex filter – Opens the configure complex filter window.
6.9.2. Complex filter window
The complex filter window is opened after clicking on the main menu item.
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