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cathode-ray oscilloscope
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Cathode-ray Oscilloscope
 is used to measure voltage and its changes over time. This is how the CRO screen would appear measuring AC and DC current.', copy:'(Image © RM)'});)
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Instrument used to measure electrical potentials or voltages that vary over time and to display the waveforms of electrical oscillations or signals. Readings are displayed graphically on the screen of a cathode-ray tube.
The CRO is used as a voltmeter with any voltage change shown on screen by an up (positive) or down (negative) movement of a bright dot. This dot is produced by a beam of electrons hitting the phospor layer on the inside of the screen. Over time the dot traces a graph across the screen showing voltage change against time. If voltage remains constant the graph consists of a horizontal line.
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
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