vaveform is about 900 us, when the orizontal or time scale is 250 us/div and here are about 3.60 div for each cycle. The on" section lasts for ~ 550 us and the "off" ections for ~ 350 us. The calculated RC me constant for this specific set up, using he equation t=-In RC) , is 555 us. his value is close to the duration of the on ection. With a pulse duration of 550 us and period T = 900 us, this gives the pulse vave a duty cycle D of 60%, meaning the ystem is active 60% of the time