FFT

The Evaluation > FFT command generates a graph for frequency analysis with Fast Fourier Transformation (FFT).

If you only need a certain section of the measured value curves for FFT, then select this section of the diagram before selecting the command. Only the selected section is then used for the FFT.
Selecting a range

 
Tip

The underlying FFT algorithm does not require the number of values being a power of 2 (Bluestein algorithm).

Exit the FFT view by closing the window or by calling the Evaluation > FFT command again.

Please note that this is only a different representation of the current diagram. Therefore, the FFT view cannot be saved.

You can set certain options with the Evaluation > FFT Settings... command:

Hanning window
The input values are multiplied by a Hanning window. This suppresses the high spectral components that occur at the beginning and end of the measurement.

Remove the constant component from input values
The mean is subtracted from the input values.

Standardize output values to 1
The output values are standardized so that the sum of all values is 1 or 0 dB.

Divide output values by maximum input value
The output values are standardized to the maximum input value.

Logarithmic scaling
The output values are scaled logarithmically.

Show Phase Additionally
This option shows a second curve for the phase in degrees or radians.