Three-condition display system

Details Three-condition display system Three-condition display system

1980-04-14

1982-03-23

Tokar, Michael J.

Electricity: measuring and testing

Electrolyte properties

Using a battery testing device

324133, G01N 2742

Patent

active

043215432

ABSTRACT:
Apparatus for detecting and displaying a high, normal, or low condition of battery voltage or engine temperature in an automobile by energizing an H, a dash, or an L, respectively, on a 7-segment display device. A voltage representing the condition is compared with upper and lower threshold voltages in comparators. Outputs of the comparators are applied through inverting and noninverting transistors to specific segments of the display unit. An input voltage above the lower threshold energizes the middle horizontal segment which displays a dash representing a normal condition. An input voltage above the upper threshold energizes the vertical segments to complete the display of an H representing a high condition.

REFERENCES:
patent: 4020414 (1977-04-01), Paredes
patent: 4163935 (1979-08-01), Sakurada

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