AN EASY-TO-USE COMBINATION 4-TERMINAL-PAIR TWO-TERMINAL-PAIR AC TRANSFORMER BRIDGE/

A new four-terminal-pair bridge, capable of achieving a relative stand ard uncertainty of 1x10(-9), was constructed at the National Institute of Standards and Technology by converting a two-terminal-pair bridge. The conversion requires only the addition of components which are eas ily removed if two-terminal-pair measurements are to be made. The desi gn and testing of this bridge is described. The new four-terminal-pair bridge requires fewer auxiliary balances than the present four-termin al-pair bridge employed at NIST, which makes it much easier to use. Th is new design can be used to compare capacitance, resistance, and indu ctance standards.