A test board for watt-hour meter standards

THE Central Laboratory of the New England Power Service Company maintains the watt-hour standards for the New England Electric System. Up to recently, calibration techniques were not satisfactory since not only field watt-hour meter standards but reference watt-hour meter standards showed errors, minor in so far as commercial yardsticks were concerned, but annoying from the laboratory point of view. To minimize these errors, test procedures and equipment were reviewed. The aim was to stabilize all conditions which might influence the reference standards, to eliminate in so far as possible the errors due to the human element, and thus reduce inaccuracies.