High-resolution electronic balance

Details High-resolution electronic balance High-resolution electronic balance

1983-03-31

1984-12-11

Miller, Jr., George H.

Weighing scales

Self-positioning

Repositioning in response to deflection under load

177210EM, G01G 700, G01G 314

Patent

active

044872801

ABSTRACT:
A correction of temperature errors of the measured value receiver is generally necessary in high-resolution electronic balances. This can be accomplished in a known manner by directly influencing the measured value receiver with the aid of an analogous temperature sensor or by digitizing the output signal of the temperature sensor in a digitizer on the output side and performing the correction in the digital signal processing part. The invention has the task of indicating a circuit which permits the high-resolution digitizer which is present in the balance in any case to be used for digitizing the temperature signal without diminishing its preciseness. A switch (25 in FIG. 1) is provided to this end which feeds the output signal of a temperature sensor (27) to the input of the digitizer (15) in addition to the signal of the measured value receiver (1 . . . 13) at certain times controlled by the digital signal processing unit (22). The sensitive measuring path of the balance is therefore not reversed as it is in the case of customary selector switches, but the temperature signal is added to the measured signal of the balance at certain times and calculated by the digital electronic elements.

REFERENCES:
patent: 4034819 (1977-07-01), Akers et al.
patent: 4189017 (1980-02-01), Strobel et al.
patent: 4300647 (1981-11-01), Knothe et al.

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