Method and apparatus for measuring cumulative time

Details Method and apparatus for measuring cumulative time Method and apparatus for measuring cumulative time

1996-07-02

2000-02-01

Roskoski, Bernard

Horology: time measuring systems or devices

Regulating means

For compensation

368107, G04B 1720

Patent

active

060195002

ABSTRACT:
An apparatus for measuring cumulative time of operation time of an electrical equipment is comprised of a CPU having a nonvolatile memory and a RAM. This apparatus executes the following steps: (1) reading cumulative time data Ts of the nonvolatile memory and presetting it to a timer counter of the RAM when a measurement command is turned on wherein Ts is a value represented by Ts=(A minutes.times.n+A/2 minutes) when n is a positive integer; (2) measuring ON time on the timer counter in which Ts is preset; (3) checking as to whether the ON time becomes integer time A minutes; (4) When the ON time becomes integer times A minutes, the sum of the ON time and A/2 minutes is read in the nonvolatile memory as Ts. Therefore, the accumulated error of the cumulative time is decreased.

REFERENCES:
patent: 4197582 (1980-04-01), Johnston et al.
patent: 5164923 (1992-11-01), Avis

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