AC supply fluid meter

A fluid meter including an electric generator, a metrological sensor, a control block, a power supply block coupled to the electric generator, and configured to supply energy to the control block, in which the power supply block includes a first supply path includes at least one primary cell, and a second supply path connected to the electric generator, including a capacitor and a first switch configured to selectively couple the capacitor and the electric generator, the power supply block including a second switch configured to selectively couple the first supply path or the second supply path to the control block, the power supply block further including a current sensor determining a current measurement, the first switch and the second switch being monitored according to a state of charge of the capacitor determined from the current measurement.