| Definition: | time required for the output to change, after a step variation from one steady input to another steady input, by the fraction (1 − 1/e) of its total change in value, where the total change in value is the difference between the initial value and the final (asymptotic) value Note 1 to entry: The time constant is expressed in seconds (s). Note 2 to entry: This entry was numbered 845-05-59 in IEC 60050-845:1987.
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