Operability verification for segmental electromagnetic display

Details Operability verification for segmental electromagnetic display Operability verification for segmental electromagnetic display

G - Physics

09

F

354/37, 375/5

G09F 9/30 (2006.01)

Patent

CA 1146681

OPERABILITY VERIFICATION FOR SEGMENTAL ELECTROMAGNETIC DISPLAY Abstract of the Disclosure In fuel dispensing apparatus utilizing seven-segment electromagnetic displays each segment of all the displays is operatively driven and tested seriatum both prior to and during the dispensing cycle by measuring the current flowing therethrough. Where peak current through each segment coil exceeds a predetermined switching value within an allotted time period, an inactivating signal is emitted via a microprocessor to inactivate the drive for the re- spective segment. Failure to receive one or more of the inactivating drive signals per display represents a display malfunction which via the microprocessor renders the dis- pensing apparatus inoperable.

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