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thermal output       (1) Portion of the measurement signal caused by a temperature-induced change in resistance of a strain gage that is independent of, and unrelated to, the mechanical strain in the test part. (2) The reversible part of the temperature-induced strain of a strain gage installed on an unrestrained test specimen when exposed to a change in temperature. obsolete: temperature-induced apparent strain. References : (1) Vishay Measurements Group Tech Note TN-504, Strain Gage Thermal Output and Gage Factor Variation with Temperature .  (2) OIML International Recommendation No. 62