Why does electronic weighing change?
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By chance, while calibrating measuring instruments, I discovered that when an electronic scale weighs the same object, the results obtained when it is placed on a solid foundation and on a soft foundation are inconsistent, and this phenomenon can be repeated. We can't imagine the reason. Can anyone explain it theoretically?
The conditions for electronic weighing require that the scale be placed on a horizontal plane, with all four feet on the ground to prevent deviation, so that the scale can be weighed accurately.
The prerequisite for the use of an electronic scale is that the four corners must be level, so that the sensor can be evenly stressed. Only when the force is evenly applied can accurate measurement be achieved. The phenomenon you mentioned is normal. If the level is adjusted and the weight is not the same every time, it is wrong.
Soft foundation is definitely not accurate, it depends on the level
If it is on a solid tabletop and is not level, will it weigh more or less?
The difference is related to the level. You can confirm the deviation by doing experiments.
The reason is that during the weighing process, the weighing objects are placed unevenly, resulting in uneven force on the load cell.