Electricity: measuring and testing – Electrical speed measuring – Including 'event' sensing means
Patent
1976-12-17
1979-04-17
Tokar, M.
Electricity: measuring and testing
Electrical speed measuring
Including 'event' sensing means
324182, G04F 800
Patent
active
041503333
ABSTRACT:
An electronic recorder is disclosed which acts as an elapsed time indicator for monitoring the operation of at least one item of equipment and providing display or other indication of the total time for which the item of equipment has been energized. The recorder includes a solid-state oscillator and a divider which together constitute a time-base for producing clock pulses only when the item of equipment is in an energized state. A solid-state counter counts the clock pulses and a solid-state memory stores information corresponding to the counter total. So that the recorder can retain its cumulative total count even when de-energized with the item of equipment, the memory is of the non-volatile type which retains its stored information even when de-energized. A solid-state display means displays the counter total to provide an indication of the total time for which the item of equipment has been energized.
To enable the recorder to be able to indicate not only for how long the equipment has been energized but also how many times it has been energized, means can be included for generating further clock pulses corresponding respectively to each energization of the item of equipment. A second solid-state counter counts the further pulses and a second solid-state memory of the non-volatile type stores information corresponding to the total of the second counter.
REFERENCES:
patent: 3801916 (1974-04-01), Brittain
patent: 3911362 (1975-10-01), Roberts
patent: 4006415 (1977-02-01), Finger
Edwards Geoffrey S.
Lapinski George A.
Oxley Developments Company Limited
Tokar M.
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