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US 4,696,359 AGranted
Electronic weighing apparatus
AssigneeNational Transducer Corporation
InventorAlbert W. Glibbery
Life of this patent
Estimating the term…
Abstract
An electronic weighing apparatus providing accurate weight using a low level power supply. A force responsive strain gauge having a high impedance, provides an electrical output to a sample and hold circuit. The signal from the strain gauge is conditioned by a sequencing circuit which turns the strain gauge and sample and hold circuit on and off at a rate providing a very low duty cycle to keep power consumption to a low level. Power is supplied by a photo-voltaic panel built into the electronic weighing apparatus responsive in light levels as low as 50 lux.
Claims15
A weighing apparatus comprising:
- force responsive strain gauge means providing an electrical output;
- said force responsive strain gauge means having a high impedance;
- sample and hold circuit means receiving the output from said force responsive transducer means for sampling and holding said output;
- sequencing means for sequentially turning said force responsive strain guage means and said sample and hold means on and off;
- digital processing means for processing the output of said sample and hold means;
- display means for displaying the output of said digital processing means;
- and
- low voltage power supply means supplying power to said force responsive transducer and to said sample and hold circuit means.
5 more elements
Dependencies are inferred from the claim text.