One of the auto measurement types in digital oscilloscopes, relating to a derivative measurement type of amplitude and time, is the definition of an area under the waveform curve. The signal area corresponds to the sum of the signal values from the first to the last cycle point, relative to the zero level, multiplied by the time interval between the extreme cycle points. The values which are above zero and are measured above the ground potential level give a positive contribution into the area; the values which are below zero and measured below the ground potential – negative. The area under the whole waveform or the gated area is expressed in volt-seconds.
The animated picture below demonstrates a sinusoidal signal waveform with a variable constant component. The signal area is marked in blue. The calculated value of the area under the waveform is displayed in the measurement results display zone.
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