First, check the manual to see whether the instrument has a screen capture command. Some do but many don't. If there is no such command, then (assuming you have a GPIB connection), then you will have to get the data from the instrument using the appropriate read commands. All of the information on the screen should be available for transfer and you can reproduce all of it on your pc's display. If your program is commanding the instrument, then you should already have the settings available and would only need to request waveform and measurement data.
