| Popis: |
Bridges employing inductive voltage dividers are known to be more accurate and more stable than comparable bridges employing resistances as their adjustable elements. Inductive voltage dividers have other desirable properties that have received less attention. Among these are high input impedance, and low output impedance. These secondary advantages are discussed and a typical circuit is solved, both in the balanced and the unbalanced states. It is shown quantitatively that unbalance currents can flow without the necessity of magnetizing the dividers and that this can lead to output impedances that are almost entirely resistive, with negligible reactive components. This desirable state of affairs can exist because magnetic field is a vector quantity and the fields of two currents in an inductor can cancel. Similar possibilities seem to be lacking when resistors or capacitors are used. |
