instrumental drift

continuous or incremental change over time in indication, due to changes in metrological properties of a measuring instrument. Note that instrumental drift is related neither to a change in a quantity being measured nor to a change of any recognized influence quantity.

References: 

Joint Committee for Guides in Metrology (JCGM/WG 2) 200:2012 & ISO/IEC Guide 99-12:2007, International Vocabulary of Metrology – Basic and General Concepts and Associated Terms (VIM), http://www.bipm.org/en/publications/guides/vim.html

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