A measurement is the experimental determination of the magnitude of a physical quantity by comparing it with the corresponding unit of measurement. However, most measurements are made indirectly by exploiting physical effects in suitable measuring devices such as transducers or sensors. Most often the quantity to be measured is converted by a sensor into an output quantity of different nature that then can be amplified and recorded as required. A particularly convenient type of output signal is an electric quantity, and one speaks of an electric measuring method.
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