4. Select measurement points and code data files
        Suppose your EUT is a DC/CD converter, measure the test points from 0 to 18 and name and save the tested data files from sc1.000 to sc1.018 correspondingly. All data files are acquired with the same sampling frequency 500MHz (the highest sampling frequency of your oscilloscope), and saved in the same data length of more than 1024 points but only the first 16384 points will be treated for big data files.