Abstract: Apparatus and method is provided wherein power pulses are supplied from a standard meter to a supplementary data accumulating means associated with a meter under test. Data accumulation means in the supplementary data accumulating means and in the meter under test are set to a known value and both meters are subjected to similar voltage and current values. A stop signal is generated when the supplementary data accumulating means reaches a predetermined value N and the value in the meter data accumulating means is latched. The stop signal causes arithmetical division of the latched value by N to form a quotient value and is entered into a reference value memory in the meter under test, the reference value memory value determining the number of pulses per unit power pulse generated by the meter.

Abstract: A method for generating a product of signals proportional to the voltage of an electrical supply and the current flowing through a load connected thereto, comprises the steps of deriving a first signal proportional to the said supply voltage, deriving a second signal proportional to the load current, frequency modulating two constant frequency carrier signals by the said first and second signals to produce third and fourth signals respectively, normalizing the third and fourth signals with reference to frequencies corresponding to zero voltage and zero current, and multiplying the two normalized third and fourth signals to form a product signal which is proportional to the power being absorbed by the load connected to the electrical supply. The third and fourth signals comprise pulse trains whose instantaneous pulse repetition rate is proportional to the voltage and current. Apparatus is described for performing this method. A 555 timer device is employed for voltage to frequency conversation.