"Aikavakio" (Time constant) (6) on aika, joka kuluu valoärsytyksen antamisesta siihen, kun virran lisäys saavuttaa arvon, joka on 1-1/e kertaa lopullinen arvo (eli 63 % lopullisesta arvosta).
This move is propelled in part by the increasing complexity of corporate structures and the burden it places on regulators to assess ownership through numerous holding companies, individuals and entities (Trappel and Meier, 1998).EurLex-2 EurLex-2