Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1989-07-05
1990-12-04
Miller, Jr., George H.
Weighing scales
Self-positioning
Electrical current generating or modifying
177185, 177 2514, G01G 314, G01G 2310, G01G 19413
Patent
active
049746790
ABSTRACT:
This invention relates to load cells having integral load measurement and measurement data output means. Load cells have previously comprised a load support member and a force detection element and all detection and measurement of the electrical characteristic of the force detection element have take place external to the load cell device. This invention provides a force detection element, at least one pair of voltage reference signal output means, switch means to direct pairs of voltage signals to an amplification means, a temperature sensor means with voltage output, a low pass filter means and analogue to digital conversion means operating on the above filtered and un-filtered outputs of the amplifier signals, a memory circuit which holds a plurality of digital values representative of various applied forces at various ambient temperatures of the load cell and reference voltage signals, a control and processing circuit which controls the pairs of signals switched to the amplification means and the filter means and thereby received by the processing circuit means and which uses the contents of the memory circuit means to calculate values representative of the force applied and produce signals representative of the force applied to the load cell in analogue and digital bit stream format.
REFERENCES:
patent: 4836308 (1989-06-01), Davis et al.
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