| ratio between the change of the controlled variable with closed-loop control and its change without control in case of changing of the reference variable or a disturbance variable under given conditions|
Note 1 to entry: In case of sinusoidal input variables the complex control factor is the quotient of the phasors of these values as function of the angular frequency.
Note 2 to entry: In case of stepwise changing of input variables the real control factor is the quotient of these values after the end of the transient processes. If there are one or more integral elements in the forward path the value of the real control factor is zero.
Note 3 to entry: In closed-loop control with proportional behaviour of the open loop the real control factor is given by
where K0 is the loop gain.
Note 4 to entry: This entry was numbered 351-25-08 in IEC 60050-351:2006.