WATTMETER CAPABLE OF MEASURING IN SEPARATE TIME RANGES

摘要

A time based measuring system for electric energy meters includes a non-volatile data memory for processing time related data. The system further includes a main DC supply energized from an AC source and an auxiliary DC supply energized by a primary battery source. The data memory and a low power secondary timer circuit are energized from the auxiliary DC supply in response to failure of the main DC supply. A low power circuit arrangement including the secondary circuit continues current time and calendar registrations during a power outage.