Frequency characteristics of loop oscillographic galvanometers

Conclusions

An analysis of the above experiments shows that in concentrated liquid damping of loop oscillographic galvanometers there can be two kinds of distortions of the frequency characteristic, namely, distortions due directly to the presence of bounded damping sections (concentrated damping effect), and the residual distortions which have not been smoothed out and are due to the complex nature of the loop oscillatory system (string effect). On the basis of the above information on the nature and origin of distortions it is possible to find the number and position of dampers which will make distortions virtually unnoticeable. Moreover, the concentrated damping effect can be used, if necessary, to obtain a galvanometer with frequency characteristics which differ in the required manner from the theoretical characteristics of a system with a single degree of freedom.