Introduction FFTW is a C subroutine library for computing the discrete Fourier transform (DFT) in one or more dimensions, of arbitrary input size, and of both real and complex data (as well as of even/odd data, i.e.RigolDso is a Java application that is useful to get data from a Rigol DS1052E digital oscilloscope.The idea is about to use the DSO for get measure (without PC control) and then easily and fastly transfer data to PC (USB) for documentation of a project.You can show data and parameters about measures save them in CSV files or (in future) bitmap, pdf, ps. Get, record, display and save DSO data.Just make sure you remember their orientation. The batteries are easier to remove once the case is open, than battling the accursed battery compartment door. Then remove the four T-10 (Torx) screws at the corners.