${\displaystyle g\left(t\right)=\frac{1}{K_{\text{δ}}}\cdot \Delta v_{\delta }\left(t\right)}$

Note 1 to entry: The unit-impulse response g(t) of a system contains all properties of the system and is used to calculate the response Δv(t) of the system to any input variable Δu(t) by the convolution integral

$\Delta v\left(t\right)={\displaystyle \underset{-\infty }{\overset{\infty }{\int }}g\left(\tau \right)}\cdot \Delta u\left(t-\tau \right)\text{d}\tau$.

Note 2 to entry: The systems frequency response ${\displaystyle G\left(\text{j}\cdot \omega \right)}$ may be calculated by Fourier transformation of g(t):

$G\left(\text{j}\cdot \omega \right)=ℱ\left\{g\left(t\right)\right\}$.

Note 3 to entry: The unit-impulse response of a system mathematically may be considered to result from application of a unit impulse to an input variable.

Note 4 to entry: This entry was numbered 351-24-19 in IEC 60050-351:2006.