I am a highly experienced engineering professional who routinely converts data between time and frequency domain as a routine part of my everyday work. I can provide you with the correct scaling, determination of relevant frequencies, peak finding, amplitudes, peak-to-average ratios, plotting, filtering, etc... or whatever signal metrics are requested.
I will most likely write the code for your project using Python 3.0. I will provide you with the code at the completion of the project as well as the completed converted data in a .csv file format with the column names clearly indicated. Optionally, I can also do this in Excel or Matlab.