  A system employing a desktop FADC has been developed to investigate the
features of 8 inches Hamamatsu PMT. The system stands out for its high-speed
and informative results as a consequence of adopting fast waveform sampling
technology. Recording full waveforms allows us to perform digital signal
processing, pulse shape analysis, and precision timing extraction. High
precision after pulse time and charge distribution characteristics are
presented in this manuscript. Other photomultipliers characteristics, such as
dark rate and transit time spread, can also be obtained by exploiting waveform
analysis using this system.
