After having first been maintained under reference voltage for at least one hour with no current supplied to the circuits, the rated maximum current shall be applied to the current windings. The error of the meter shall be measured immediately after it is put into operation and then at sufficiently short intervals to permit correct plotting of the curve of error variation as a function of time.
L'erreur du compteur est mesurée immédiatement après la mise en service et ensuite à intervalles suffisamment courts afin de permettre un tracé correct de la courbe de variation d'erreur en fonction du temps.
