| Frequency Meter: A frequency meter displays the frequency of an incoming signal in Hertz. The frequency meter is the digital counterpart to the Fourier analyzer. By default, frequency meters operate during both Stop mode and Run mode. You can place between one and three frequency meters and move them freely about the simulation window. In the meter's Properties Box, you can decide if the frequency meter will work in Stop mode. You must place a frequency meter to plot frequencies using the graph tool. The frequency meter is one of four wave measurement tools in Sound Lab.