Accelerometers are electromechanical devices that measure acceleration. An accelerometer will determine the presence and magnitude of either dynamic forms of acceleration, like vibration or movement, or static forms like gravity. Accelerometers measure acceleration through internal capacitive plates; a sensor detects changes in capacitance as the plates move in relation to each other, responding to acceleration forces acting on the device. These passive devices provide analog signals that can be measured, converted to data, and analyzed using a data acquisition system, such as a data logger.