Paragraph 177 DEFINITIONS OF TERMS IN THIS ANNEX
“Time constant” (6) is the time taken from the application of a light stimulus for the current increment to reach a value of 1-1/e times the final value (i.e., 63% of the final value).
“Time constant” (6) is the time taken from the application of a light stimulus for the current increment to reach a value of 1-1/e times the final value (i.e., 63% of the final value).