These definitions provide a basis on which the calibration of amperemeters can be conducted.
After this event the Calibration Curve.
The calibration of ammeters is best conducted by means of a series of standard low resistances and of a potentio meter.
The accuracy of a meter is tested by drawing calibration curves showing the percentage departure from absolute accuracy in its reading for various decimal fractions of full load.
This can be determined by a direct calibration, by inserting a known quantity of water at a known temperature and observing the contraction, or weighing the mercury drawn into the apparatus.