METHOD AND APPARATUS FOR MEASURING CUMULATIVE TIME.

摘要

AN APPARATUS FOR MEASURING CUMULATIVE TIME OF OPERATION TIME OF AN ELECTRICAL EQUIPMENT IS COMPRISED OF A CPU HAVING A NONVOLATIVE MEMORY AND A RAM. THIS APPARATUS EXECUTES THE FOLLOWING STEPS: (1) READING CUMULATIVE TIME DATA TS OF THE NONVOLATIVE 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 X 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.