Patent ID: 6031369
Filing Date: 2000-02-29
Classification: G01R

Abstract:
An electricity meter operative to receive a mains A.C. signal and a first A.C. signal the magnitude of which is dependent on electrical power through a conductor, comprising a first pulse generating device operative to provide pulses at a rate proportional to the magnitude of the first A.C. signal while the mains A.C. signal is positive, and a second pulse generating device operative to provide further pulses at a rate proportional to the magnitude of the first A.C. signal while the mains A.C. signal is negative, the meter including accumulator device to determine from the pulses a first pulse count for the periods while the product of the first A.C. signal and the mains A.C. signal is positive and a second pulse count for the periods while the product of the first A.C. signal and the mains A.C. signal is negative, the pulse counts providing a measure of energy conducted, in which the first pulse generating device comprises a first integrator circuit and the second pulse generating device comprises a second integrator circuit, and in which the first integrator circuit comprises a first capacitor connected to a first pulse generator, and the second integrator circuit comprises a second capacitor connected to a second pulse generator.