What is the formula for determining the speed (or frequency) of the incoming generator assuming the bus speed is 3600 rpm (frequency 60Hz) based upon the sweep speed of the synchrosscope? Example 1 - If the Syncscope is sweeping clockwise 1 revoluton every 20 seconds what is the speed of the generator. Example 2 - If the Syncscope is sweeping clockwise 1 revoluton every 10 seconds what is the speed of the generator.