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Definition of "double bridge" |
a Wheatstone bridge modification designed to increase the precision of measurements for low-value resistors. To avoid the error due to resistance of the connection (called yoke) between the unknown resistor and the standard resistor, the ends of the unknown resistor and the standard resistor are connected to the balance detector (usually a galvanometer for this type of bridge) via two small resistors, the ratio of which is the same as the ratio of resistors in the ratio arms. Then the yoke resistance is eliminated from the balance condition and the unknown resistor can be found using the same formula as in an ordinary Wheatstone bridge. |
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