, where   – Real-time constant of the differentiating unit;
  – Transfer coefficient of the differential level ().
Thus, the real differentiating element is described by the differential equation:

Оbviously, (3.12) can be represented as:

Hence we have:

The implementation of equations (2.16) and (2.17) is shown in fig. 2.4.
In view of (2.16) and (2.17) the general structure of control systems with real compensator is shown in fig.2.5.