Measurement of Self-inductance by Maxwell Bridge

  Procedure:

  1. Apply Supply voltage from with arbitrary frequency. ( V =3v).

  2. Set the value of Lx inductor from Set inductor value tab.

  3. Choose the values of C1, R1, R2 and R3 from the Controls below.

  4. Switch on the supply. Observe the milivoltmeter pointer.

  5. If "NULL" is achieved, click "Simulate" from measure inductor value tab. Observe calculated values of unknown Inductance and unknown internal resistance of the inductor.
    6. If better "NULL" is desired, repeat from step 3.

  6. Quality factor value of this coil should be less than 10. Q-Factor of unknown coil =(w*La)/Ra.

Tutorials Point

  •   Choose the type of inductor from the check box out of:
        1) Air Core (Lx = 45mH)     2) Iron Core (Lx = 450mH)
      N.B.:- Range of C1=100pF to 11.111uF (in steps of 100pF ).
      Range of R1,R2,R3,Rx is 1ohm to 11111110 ohm (in steps of 1ohm ).
  • The current voltmeter reading is:   mv. Now simulate to get:
         Inductor value (in H):
    Resistance value (in Ohm):
    Quality Factor:
CONTROLS
   R1 : 1 Ohm     11.1 MOhm
   R2 : 1 Ohm     11.1 MOhm
   R3 : 1 Ohm     11.1 MOhm
   C1 : 1 nC     111.1 uC