Maxwell’s Bridge is used for the measurement of inductance in terms of comparison with a standard variable capacitance using the following equation. This trainer has capability to measure inductance in the range of 1mH to 1H
Lx = C1 R1 R2

Lx is unknown inductance, R1& R2 non-inductive resistance and a standard capacitor-C1. In this bridge we are having three sections. A built in oscillator section with a frequency. A bridge section with four arms. Arm AC consists of unknown inductance (Lx). Arm AD consists of Variable non-inductive resistance R1. Arm CB consists of non-inductive resistance R2 with multiple selection ranges. Arm BD consists of parallel network of fixed & Resistance (R3) with multiple selection ranges. The balance of bridge can be observed using a built-in audio amplifier with loudspeaker arrangement. This acts as a null detector.