Maxwell’s bridge

Objective:

Measurement of Inductance by Maxwell’s Bridge

Apparatus Used:

1.     Maxwell’s Bridge trainer Kit

2.     Headphone

3.     Connecting Wires

Optional Accessories: Digital Multimeter

Theory:

AC bridge method are of outstanding importance for measurement of electrical  quantities. Measurement of inductance, capacitance, storage factor, loss factor may be made conveniently and accurately by employing AC bridge network. The AC bridge is a natural outgrowth of the Wheatstone bridge.

An AC bridge, in its basic form, consists of four arms, a source of excitation, and a balanced detector. The usefulness of AC bridge circuits is not restricted to the measurement of unknown impedance and associative parameter like inductance, capacitance, storage factor, dissipation factor etc. For higher frequency electronic oscillator are universally used as bridge source supplies. These oscillators have the advantage that the frequency is constant, easily adjustable, and determinable with accuracy, The waveform is very close to sine wave, and their power output is sufficient for most bridge measurement. The detectors commonly used for AC bridges are

This bridge is an AC bridge used to measure the inductance. THIs bridge circuit measures an inductance by comparison with the variable standard self inductance.

Advantage

1)    This bridge is very useful for measurement of a wide range of a inductance at the power and audio frequencies.

2)    The frequency does not appear in any of the two equations.