Vectorscope

thumb|250px|A video vectorscope displaying color bars. The diagonal direction of the [[colorburst vector is indicative of a NTSC signal.]] thumb|250px|The graticule of an NTSC vectorscope. thumb|250px| A PAL vectorscope displaying color bars.

A vectorscope is a special type of oscilloscope used in both audio and video applications. Whereas an oscilloscope or waveform monitor normally displays a plot of signal vs. time, a vectorscope displays an X-Y plot of two signals, which can reveal details about the relationship between these two signals. Vectorscopes are highly similar in operation to oscilloscopes operated in X-Y mode; however those used in video applications have specialized graticules, and accept standard television or video signals as input (demodulating and demultiplexing the two components to be analyzed internally).