Abstract: An electronic weight indicator adapted to convert an analog output of a load cell into a digital display which, after initial calibration, automatically corrects for dead load, drift and other calibration errors introduced by the circuitry. The meter can also be programmed to count for creep. The weight indicator employs a microprocessor to control an analog-to-digital converter which converts the analog signal from the load cell to a digital display. The microprocessor employs a unique algorithm permanently retained in an associated memory to correct for drift and compensate for deadload changes and creep. Once calibrated, no further adjustments by the user are required. All adjustments are made automatically, without operator intervention. The weight indicator can be used with any load cell producing an analog signal in response to a force, e.g. a weight on a weighing platform connected to the load cell.

Abstract: An electronic counting scale, which may comprise a single relatively compact unit including all operable elements; or which may be based upon a modular construction including, firstly, an electronics unit which includes all basic electronic circuitry necessary to operation; and, secondly, a base unit. The base unit in the modular construction, includes the load cell, associated mechanical linkage, the weight receiving platform, and the like. It is adapted to directly receive the electronics unit, and includes connector means for enabling electrical interconnection with the electronics unit, and means for mechanically coupling the base unit to the electronics unit. The load cell is a parallelogram-type flexure frame, and is characterized by four strain gauges, which are located at the upper and lower surfaces of two vertically overlying flexure corners of the parallelogram. This arrangement--because of symmetry considerations--is uniquely free of second-order errors generated by offset loading.