mõõteobjekti ja tööetaloni pikkuste muutuste erinevus temperatuurimuutuste korral 20 °C-lt mõõtmiste ajal valitsevast temperatuurist lähtudes
difference between the changes in the lengths of the workpiece and the working standard in response to temperature changes from 20 0C to their temperatures at the times of the measurements
Kalibreerimisel tuleb lisaks tööetaloni temperatuurist tingitud pikkuse muutusele arvestada ka kalibreeritava mõõtevahendi või kalibreeritava mõõtevahendi skaala (eriti klaasskaala, nagu pikkusmõõturil) pikkuse muutust ehk joonpaisumise vahet.
During calibration, in addition to the change in length of the working standard due to temperature, the change in length of the measuring instrument being calibrated or the scale of the measuring instrument being calibrated (especially a glass scale, such as a length gauge) must also be taken into account, i.e. the differential thermal expansion.
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