An inductronic double bridge

THE Kelvin or double bridge is considered as the standard type of bridge for the measurement of very low-resistance values and, more specifically, where 4-terminal resistances are used. Typical examples are in the comparison of shunts which are basically 4-terminal resistors and in the measurement of conductivity where the current terminals are at the ends of the wire or bar under consideration, and the millivolt terminals are between those current terminals.1¿3