Figure 3-1.Periodic waveforms. A SQUARE WAVE is shown in figure 3-1, view (B). As shown, it has two alternations of equalduration and a square presentation for each complete cycle. Figure 3-2 shows a breakdown of the squarewave and is the figure you should view throughout the square wave discussion. The amplitude ismeasured vertically. The time for a complete cycle is measured between corresponding points on thewave (T0 to T2, or T1 to T3).