Certain dynamic problems in photocompensated amplifiers

Conclusions

The effect of a differentiating network on the transient process in a galvanometric compensator depends to a great extent on the place where this network is connected.

A differentiating network connected into the direct amplifying channel raises the damping of the system. But, in this case, the transient process depends not only on the degree of damping, but also on the extent to which the damping is due to magnetic induction and to the differentiating network. The operating speed of the system rises with an increasing effect of the differentiating network; however, its sensitivity to noise also rises, usually.

When a differentiating network is connected into the feedback channel, the system's transient processes remain identical to those produced by magnetic induction damping provided by the galvanometer coil or frame.

The relationships cited in the article provide the possibility for computing parameters of differentiating networks for a given degree of damping.

It should be noted that although the above data refer to a compensator with dynamic properties represented by a second-order characteristic equation, the above differentiating networks can be used to raise the available stability in systems represented by characteristic equations of the third and higher orders.