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Wagner's earth devices are used in ac brid...

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Wagner's earth devices are used in ac bridge circuits for

  1. Eliminating the effect of earth capacitances
  2. Eliminating the effect of inter-component capacitances
  3. Shielding the bridge elements
  4. Eliminating the effect of stray electrostatic fields
Asked By : Bharath KumarCategory : MBBS
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Wagner ground for AC supply minimizes the effects of stray capacitance to ground on the bridge.
The Wagner earth circuit is nothing more than a voltage divider, designed to have the voltage ratio and phase shift as each side of the bridge. Because the midpoint of the Wagner divider is directly grounded, any other divider circuit (including either side of the bridge) having the same voltage proportions and phases as the Wagner divider, and powered by the same AC voltage source, will be at ground potential as well. Thus, the Wagner earth divider forces the null detector to be at ground potential, without a direct connection between the detector and ground.

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