Datakom automatic voltage regulators are used to control the output of generators (as seen in ships and power stations, or on oil rigs, greenhouses and emergency power systems). This is an active system mounted near the generator and connected with several wires to measure and adjust the generator. In the first place the AVR monitors the output voltage and controls the input voltage for the exciter of the generator. By increasing or decreasing the generator control voltage, the output voltage of the generator increases or decreases accordingly. The AVR calculates how much voltage has to be sent to the exciter numerous times a second, therefore stabilizing the output voltage to a predetermined setpoint. When two or more generators are powering the same system (parallel operation) the AVR receives information from more generators to match all output.