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Lab Experiment for Kelvin Double Bridge

LAB EXPERIMENT FOR KELVIN BRIDGE

 

AIM

Find the value of unknown resistance using a Kelvin Double Bridge.

REQUIREMENT

  • Trainer Kit
  • Patch Chards
  • Multimeter
  • Unknown resistance.

Note

Initially short L1 & L2. Note down the digital voltmeter reading. This reading is nothing but the final balancing point when you are tuning the bridge.

FORMULA USED





PROCEDURE

  • Connections are made as per the connection diagram
  • Connect the unknown resistance at Rx terminals.
  • Switch ON the unit.
  • Select the range selection switch at the point where the meter reads least possible value of voltage.
  • Vary the potentiometer (P1) to obtain null balance.
  • Switch OFF the unit and find the resistance using multimeter at P1.
  • Tabulate the readings and find the value of unknown resistance using the above formula.

 

TABULATION

 

SL NO

P(S)

Q(S)

P1(S)

RX(S)

         
 

 

RESULT

Thus the value of unknown resistance was measured using Kelvin Double Bridge