PETER APRAHAMIAN / SCIENCE PHOTO LIBRARY. PETER APRAHAMIAN / SCIENCE PHOTO LIBRARY.
A modern digital oscilloscope, a test instrument comprising a cathode ray tube (CRT- left), a time base and amplifiers. The instrument is used for displaying voltage waveforms. In an oscilloscope the time base signal is a waveform that increases to a maximum and then rapidly returns to its reference (base) level before commencing a successive sweep. The time base signal draws the spot horizontally across the tube in order to display a particular waveform. A waveform is defined as the graphical representation of the variation of amplitude with time for a particular wave.
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