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Lab Experiment for Maxwell Inductance Bridge

AIM

To find the value of unknown inductance using a Maxwell’s Inductance Bridge.

APPARATUS REQUIRED

• Trainer Kit
• Unknown inductance
• Multimeter
• CRO.
• Patch chords.

FORMULA USED

Note

In this bridge resistance R1 is for maximum variation of output and resistance R2 is for minute Variation of output.

PROCEDURE - I

• Connections are made as per the connection diagram shown above.
• Connect the unknown inductance at the Lx (unknown) point.
• Connect the CRO across P and Q.
• Switch ON the unit.
• Choose R3, such that you can obtain a maximum variation of output.
• Now set R2 to maximum position.
• Vary the potentiometer R1 such that the amplitude of sine wave will is decreases and that one point it will obtain a minimum of zero amplitude and then it will start increasing at that point stop the tuning and switch OFF the unit.
• Remove the patching at R1 and find the resistance using Multimeter and note down the reading according to the table given below and calculate the value of unknown inductance.
• One can verify the balancing condition by connecting the bridge output (P & Q) to the CRO balance the bridge output is zero . If you vary the potentiometer R1 you can hear a maximum voltage.

TABULATION

C = 0.1uF

 SL NO R1 ohms R3 ohms Lx practical Lx theoretical

PROCEDURE - II

• Connections are made as per the connection diagram shown above.
• Connect the unknown inductance at the Lx (unknown) point.
• Connect a multimeter in mV range (AC) across P & Q.
• Switch ON the unit.
• Choose R3, such that you can obtain a maximum variation of output.
• Vary the potentiometer R1 such that the output voltage will decrease and at one point it will obtain a minimum voltage and then start increase at this point stop the tuning and then vary R2. Here also the output voltage will decrease and at one point it will obtain a minimum voltage and then start increase at that point stop the tuning.
• Repeat the above step such that you will obtain minimum voltage or zero voltage.
• Remove the patching at R1 and find the resistance using multimeter and note down the reading according to the table given below and calculate the value of unknown inductance.
• One can verify the balancing condition by connecting the bridge output

TABULATION

C = 0.1uF

 S. No R1 (Ohms) R3 (Ohms) Lx (Theoretical) Lx (Practical)

RESULT

Thus the value of unknown inductance was measured using Maxwell’s Inductance Bridge.