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Kelvin s Bridge

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Kelvin s Bridge

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    1. Kelvin’s Bridge

    2. Modified version of Wheatstone's bridge measuring range -1 micro ohm to 1 ohm Uses a second set of ratio arms Called Kelvin’s double bridge Eliminates the effects of contact & lead resistnace

    5. For bridge to balance Rx = R2. R3 / R1 Rb/ Ra = R3 /R1

    6. Mega Ohm bridge used to measure high resistance Range 0.1 to 10 6 M O Accuracy - 3 %

    8. Eqlt. For high resistance A high resistance Guard terminal to insulator

    9. Mega ohm meter

    10. High gain amplr Balancing bridge

    11. Ac bridges Based on Wheatstone bridge principle To measure L & C Appln. In communication & complex electronic circuits Used for phase shifting, providing feed back path for oscillators & ampr, filtering, measuring frequncy

    12.

    13. I1 Z1 = I2 Z3 I1 Z2 = I2 Z4 Z1/ Z2 = Z3 / Z 4 Z1 Z 4 = Z2 Z3

    15. Similar angle bridge Also called Capacitive comparison bridge Series Resistance capacitive bridge Used to measure impedance of capacitive ckt. Independent of frequency

    16. Thank u

    17. Similar angle bridge

    18. Maxwell bridge To determine unknown resistance With capacitance standard (C not affected by external field,cheap, small in size) Also called Maxwell- Wein bridge For measuring L with low Q (< 10)

    19.

    20. Hay bridge

    21. Used to measure R & L where resistance is a small fraction of reactance Xl. Used for coil with high Q Replacing capacitor for measurement in similar angle bridge Opposite Angle bridge

    22. THANK U

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