Verifying the accuracy of measurements taken by an electricity meter

An evaluation method for evaluating the accuracy of a measurement device of an electricity meter, the evaluation method being performed by and in the electricity meter and comprising:

• a preliminary stage comprising a step of acquiring first measurements of a first electrical magnitude, and a step of detecting a period of stability during which the first electrical magnitude is stable;
• a test stage following detection of the period of stability and comprising an injection step for injecting a test current into a conductor of the electricity meter for a predetermined duration, and a step of acting during the injection step to acquire at least one second measurement of the first electrical magnitude;
• an evaluation stage comprising a step of comparing the second measurement of the first electrical magnitude with a sum of a first stability value representative of the first electrical magnitude during the period of stability plus a predefined value corresponding to an expected increase in the first electrical magnitude due to injecting the test current, and a step of evaluating the accuracy of the measurement device from said comparison.