Zero drift

In metrology, the zero drift is the deviation of the index from the zero position, that is from the origin of the graduation curve.

All sensors are affected by environmental conditions and use over time. The output at zero will drift slightly over time. Some sensor types will initially exhibit a greater amount of zero drift due to the settling period of the materials used in the construction of the sensor. Other sensors may get worse over time because the sensor performance characteristics have deteriorated due to heavier than normal use over the typical life of the sensor.

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