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A voltage applied to the electron beam in a cathode-ray tube at regular intervals so that the luminous spot on the screen is deflected in a predetermined manner. The timebase is usually designed to make the beam sweep the screen horizontally, the period during which the spot returns to its starting point (the flyback) being suppressed in some contexts (e.g. in television) although in a cathode-ray oscilloscope the timebase can be put to more complicated uses.

Subjects: Physics.

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