TB20, strain gauge weighing module | Edition 1 | 21.12.2018
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10.15
Weighing technology terms
Calibration
Calibration in weighing technology is the measurement process for the reliably reproducible
determination and documentation of the deviation. A scale is checked with the help of a benchmark
(e.g. measurement piece) for the precision of the measurement value (display value). It is necessary
that the benchmark have a higher degree of precision than the weighing apparatus itself, e.g. gaging
weight. No intervention in the measurement chain takes place.
Adjustment
Adjustment is necessary when setting up a weighing device anew or in the event of failure of a
component of the measurement chain. An intervention in the measurement chain takes place.
1. The zero point of the weighing device is determined in the unladen condition (taring).
2. In the case of a presumed linear load characteristic, the end point of the load characteristic is
adapted as a characteristic value (amplification factor of the load cell) for the display in the unit of the
physical measurement variable corresponding with the applied comparison weight.
3. In the case of linearity deviations, the load characteristic is corrected by sampling points
determined through gaging weights.
The precision of the gaging weights is decisive for the precision of an adjustment. Calibration must
then be carried out again.
Gaging
Gaging corresponds to calibration. However, gaging is a juridical procedure that can only be carried
out by bureaus of standards or other approved offices. No intervention of any kind into the
measurement chain for the purpose of improving / adjusting the displayed value to the benchmark
(gaging weight). Gaging is imperative for contractual commerce and is clearly regulated by laws.
