Abstract: 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.

Abstract: A digital speed pattern generator which may have acceleration, constant velocity, and deceleration phases, which is particularly advantageous for short runs in which the constant velocity phase is not reached, as well as for longer runs, such as required for high speed elevators. A first digital speed pattern signal is generated from a pulse train which has a constant average frequency related to maximum jerk. A second digital speed pattern signal is generated during the slow-down or deceleration phase from distance pulses responsive to movement of the elevator car. The first digital speed pattern signal is suitable for use as the effective speed pattern for motor control throughout the acceleration, constant velocity and deceleration phases of the speed pattern signal. The first digital speed pattern signal is slaved to follow the second digital speed pattern signal during a deceleration phase of the speed pattern, within the constraints applicable to the generation of the first digital speed pattern signal.