The Yokogawa TA320 Time Interval Analyzer has two sampling modes: "time stamp mode" and "hardware histogram mode". In the time stamp mode, the TA320 records both of elapsed time and measurement result. In this mode the user can observe period variations in measurements with time by using the TIME VAR button. In the hardware histogram mode, the TA320 acquires up to 99,999,999 samples. In this mode high speed statistical computation of a great number of samples can be implemented.