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Even high-quality scales require routine maintenance to ensure consistent performance. A key aspect of this maintenance is scale calibration, which should be done approximately every three months. You might wonder why a scale needs to be calibrated after only a few months of use.
To understand this, we need to look at how a scale operates. At the core of a digital scale are load cells, and at the heart of the load cells are strain gauges. A strain gauge, in simple terms, is a long wire arranged in a zigzag pattern on an alloy base. This zigzag pattern allows a lengthy wire to be contained within a relatively small area.
When a load is placed on the scale, the strain gauge becomes distorted, causing its resistance to change. This change is proportional to the load. The scale's electronics then compute the weight and display it on the indicator. Once the load is removed, the strain gauge attempts to return to its original shape.
However, with repeated use, the strain gauge may not fully return to its original state, resulting in some permanent residual deformation. This does not imply that the scale is damaged; rather, it means that there is a slight variation from the original shape. Calibration addresses this deviation during routine maintenance. After proper calibration, the scale will continue to perform optimally.
You can calibrate the scale yourself if you have the necessary calibration weights. However, if precise weight measurements are critical, it is advisable to have the calibration performed by a professional.
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