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A double bridge

       Used to measure low resistance, due to Wheatstone bridge resistance of the circuit affect the meter has been eliminated, while the low value resistor in the test lead resistance and contact resistance to the circuit influence decreases, and thus into a Wheatstone bridge improvements Kelvin double bridge. Because no description of schematic diagram is no way, only on a qualitative answer to your question: Because the use of his arms stretched out his arms bridge connector is connected to resistor voltage isolated voltage, if the current connection, if by so within the measured was the measured resistance and contact resistance, which is too large.