IEVref:351-50-02ID:
Language:enStatus: Standard
Term: first-order lag element
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Definition: linear time-invariant transfer element the transfer function of which has exactly one real-value negative pole and no zero

Note 1 to entry: The transfer function of a first-order lag element is given as

$\frac{V\left(s\right)}{U\left(s\right)}=\frac{{K}_{\text{Ρ}}}{1+{T}_{1}\cdot s}$

where
 KP is the proportional action coefficient; T1 is the time constant; s is the complex variable of the Laplace transform; U(s) is the input transform; V(s) is the output transform.

Note 1 to entry: This entry was numbered 351-28-13 in IEC 60050-351:2006.

Publication date:2013-11
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