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Amplitude is measured by the amount of watts and that is being dispersed from a particular power source. The most common method of measuring amplitude is by using a voltage meter.
http://answers.ask.com/Science/Other/how_is_amplit...
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1. Signals can be input through a dedicated probe, or a less sophisticated cable. Put the signal into the input port of the oscilloscope. 2. Set a trigger source for the oscilloscope
http://www.ehow.com/how_7762656_measure-oscillosco...
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1. Find the point where the string (or other medium) is farthest from horizontal in one direction. 2. Measure the distance between that point and the horizontal. 3. Double that distance
http://www.ehow.com/how_10027031_measure-amplitude...
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Usually in decibels (dB).
http://wiki.answers.com/Q/What_is_amplitude_measur...
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