3.4.3 Responses of measuring system to typical excitations 2. Step response The unit impulse function d()= (363) The step function is 5()=( (3.64 一 The response of first-order system to a unit step input y()=1-e (365) The related laplace transform is (3.66 s(as2. Step response The unit impulse function The step function is The response of first-order system to a unit step input The related Laplace transform is 3.4.3 Responses of measuring system to typical excitations ( ) ( ) dt d t t   = (3.63) ( ) ( ) − = t '  t  t dt (3.64) ( )  t y t e − = 1− (3.65) ( ) ( 1) 1 + = s s Y s  (3.66)