An oscilloscope -LRB- abbreviated sometimes as scope or O-scope -RRB- is a type of electronic test instrument that allows signal voltages to be viewed , usually as a two-dimensional graph of one or more electrical potential differences -LRB- vertical axis -RRB- plotted as a function of time or of some other voltage -LRB- horizontal axis -RRB- .

An oscilloscope -LRB- sometimes abbreviated CRO , for cathode-ray oscilloscope , or commonly just scope or O-scope -RRB- is a piece of electronic test equipment that allows signal voltages to be viewed . Usually it shows a two-dimensional graph of one or more electrical potential differences -LRB- vertical axis -RRB- . These are plotted as a function of time or of some other voltage -LRB- horizontal axis -RRB- .
