The Time to Frequency FFT study step, which you can add to a study, where the last study type is typically a time-dependent study, performs a forward FFT from the time domain (input) to the frequency domain (output). As the default solver it adds an FFT solver. The Settings window for the Time to Frequency FFT node () has the following sections:

From the Input study list, choose the study from which the FFT takes its input data (contains time-domain studies and the name of the Frequency Domain study that correlates to Current). You can also choose Current to take it from the same study as the one that includes the Time to Frequency FFT study step. For the remaining settings, see FFT Solver, which takes the settings from this study step by default.

The contents of this section is similar to other Values of Dependent Variables sections, but it does not include any settings for the initial values of variables solved for.