| linear time-invariant transfer element created by the additive combination of a proportional element and a derivative element|
Note 1 to entry: The transfer function of an ideal proportional plus derivative element is given by
|Td||is the rate time;|
|s||is the complex variable of the Laplace transform;|
|U(s)||is the input transform;|
|V(s)||is the output transform.|
Note 2 to entry: This entry was numbered 351-28-27 in IEC 60050-351:2006.