1. The problem statement, all variables and given/known data How to find the time-base setting? 2. Relevant equations None 3. The attempt at a solution Firstly, I calculated the period of the revolution.. 3000 Rev -> 60s 1 Rev -> 0.02s Then, how to calculate the time base setting? Do we need to estimate which is the most suitable one? If the display is 10cm wide then, 0.1/0.02= 5 rev ?