Parameter Optimizer for Pspice Models is a tool designed to determine the parameters of a system modeled either in Pspice or Simulink. If several experiments are performed and they are modeled properly, then the parameters treated as unknowns can be obtained by means of an optimization algorithm that compares experimental and simulation data. Here is a video with the main features.
On the right you have access to the help page which explains in detail how to use the tool. If you prefer you can also learn by watching the videos. Registered users have access to the tool and all the previous versions.