| Oscilloscope: An oscilloscope displays the variation of an incoming signal over a short period of time. By default, oscilloscopes operate during both Stop mode and Run mode. You can place between one and three oscilloscopes and move them freely about the simulation window. If you select an oscilloscope before entering Run mode, you can tweak its display during Run mode by typing control-O to open the oscilloscope's Properties Box and then modifying its properties. In the Properties Box, you can set the maximum amplitude displayed by the oscilloscope. You can determine the scanning time, which is the size of the oscilloscope's time (horizontal) axis. If you want a steady display, you should set the scanning time equal to an integral number of the periods that characterize the incoming signal, such as the wave period or the period between beats. The refresh time tells you how often the simulator refreshes the oscilloscope's display. If you cannot obtain a steady display by tweaking the scanning time, you can set a high refresh time and freeze the display for one or two seconds at a time. Finally, you can decide if the oscilloscope will work in Stop mode. The oscilloscope is one of four wave measurement tools in Sound Lab.