Technician Handbook ! 673 Electronic & Computer Controlled Systems Repeating vs. Changing Patterns Some signals, such as square waves and sine waves, have a repeating pattern. With the right settings, repeating patterns can be displayed clearly on the oscilloscope. Some signals do not have a repeating pattern, however. When displayed on an oscilloscope, these signals will have a constantly changing pattern no matter what oscilloscope settings are selected. Technical Training 39