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...http://www.google.fr/patents/US5539304?utm_source=gb-gplus-shareBrevet US5539304 - Calibration of power meters
