Horology: time measuring systems or devices – Combined with disparate device
Patent
1992-04-22
1993-12-28
Roskoski, Bernard
Horology: time measuring systems or devices
Combined with disparate device
368 9, G04B 3700, G04F 800
Patent
active
052746119
ABSTRACT:
A method and apparatus for estimating the expired portion of the expected total service life of a mercury vapor lamp based upon the time that the lamp is electrically energized. The length of time that the lamp is energized is measured for each time period that the lamp is energized throughout the life of the lamp. A lamp usage value is determined for each time period that the lamp is energized. The lamp usage value for each time period is determined by assigning a first time dependent value for each time unit of a first predetermined time segment of the time period that the lamp is energized. A second time dependent value is assigned for each time unit of a second predetermined time segment of the time period commencing after the expiration of the first time segment that the lamp is energized. A third time dependent value is assigned for each time unit of the time period that the lamp is energized beyond the expiration of the second time segment. The first, second and third time dependent values are combined to form the lamp usage value for each time period. The lamp usage values are accumulated for each time period the lamp is energized to provide a total of the lamp life usage value. The total lamp life usage value is displayed as an indication of the expired life of the lamp.
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