Definition of error. 8.1 Consider the following block diagram R(s)→)G(s) H(s) The true error is defined as the difference between the input and the output, while the actuating error is the input to the system g E(S=R(S-C(S)(ture error) E,(S=R(S-H(s)C(S(actuating error) For unit feedback systems(H=1), the two errors coincide8.1