A precision rotating standard for the measurement of kilowatt-hours

THE accuracy with which electrical energy is metered is dependent upon the apparent measured value of the kilowatt-hour used. Quite independent of the electrical operating characteristics of the watt-hour meters used or the accuracy limits within which they are adjusted, the average accuracy of a group of watt-hour meters is directly affected by the difference between the value of the kilowatt-hour used and the true value.