Description
Given a step change \(\Delta\), calculate the number of time constants \(n_\tau\) required to reach a desired accuracy \(\delta\).
Formula
$$
if (\Delta == 0.0) \quad n_\tau = 0.0 \\
\quad \quad else \quad \quad \quad \quad \quad n_\tau = -log(|\Delta|/|\delta|) \\
if (n_\tau < 0.0) \quad n_\tau = 0.0
$$
Source
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