Mettler Instrumente Ag

Eberhard Jonath

To achieve an automatic stabilization of the zero point in a scale having a digital display, any difference between the load proportional signal and the stored reference signal (for example, the tare value) is compared to a threshold value. Differences which are less than the threshold value are halved in a divider. The halved difference signal is then used when the next subsequent one of the load proportional signal is compared to the reference signal, preferably by algebraic addition of the halved difference signal to the reference signal.

Automatic zero correction apparatus for weighing balances

A stabilization of the zero point of a digital display in a periodically operating weighing scale is accomplished by obtaining the difference between the then-present weight signal S and a stored reference signal, for example the tare value. Resulting differences less than a predetermined threshold value are stored. If the next following difference signal is again smaller than the threshold value and has the same sign, the reference value is corrected by the stored difference. If the signs are different, the tare or reference value remains the same and the value of the stored difference signal is changed to the newly-generated value.

Weighing scale with improved zero correction

A monitoring unit also using a multiplicity of segments having a common electrode and each having an individual electrode is connected to the display units and the multiplexer constituting the display so that its common electrode is energized in sequence with the common electrodes of the display units and each of its individual electrodes forms the last of a series connected set of corresponding electrodes in all display units. All electrode sets are energized when the common electrode of the monitoring unit is energized, so that failure of a monitoring segment to light indicates failure of at least one electrode in the electrode set.

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Volketswil, Switzerland

Eberhard Jonath