
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 operatio...
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http://en.wikipedia.org/wiki/Vectorscope

oscilloscope used to analyze television signals
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http://phrontistery.info/v.html

vectorscope A special type of oscilloscope used in both audio and video applications. Most modern waveform monitors include vectorscope functionality built in; and many allow the two modes to be displayed side-by-side. The combined device is typically referred to as a waveform monitor. Stand-alone vectorscopes are becoming obsolete.
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http://www.wordinfo.info/words/index/info/view_unit/3414/

An instrument similar to an oscilloscope, that is used to check and/or align amplitude and phase of the three colour signals (RGB). It has a circular, rather than rectangular screen, to show the phase angles of the component colours.
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http://www.zoo.co.uk/~z0001325/Glossary.html
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