Objective: To accurate self inductance measurement of an unknown coil .
This bridge is a modification of the maxwell's inductive and capacitive bridge. In this method, the self inductance is measured in terms of a standard capacitor. This method is applicable for precise measurement of self inductance over wide range of values. Figure 1 shows the circuit diagram of the bridge for balance conditions.
Fig. 1. Andersons Bridge
at balance, conditions
Writing the other balance equations,
Substituting the value of IC in equation (2) , we get
From equations (3) and (4) , we get by equating real and imaginary parts,
An examination of balance equation reveals that to obtain easy convergence of balance , alternate adjustments of r1 and r should be done as they appear in only equ. (1) and (2).