Abstract
A precision, self-contained, four-terminal ac resistance bridge with phase-sensitive detection is described. The variable element in the bridge is a digital-to-analog converter, so that the setting of the bridge can be computer controlled. If computer control is not required, the bridge can be set using thumbwheel switches. The accuracy of the bridge is ±(0.03% of reading +0.01% of full scale). The dissipation in the unknown resistor is less than 1 μW for a full-scale range of 99.99 Ω, and less than 1 nW for a full-scale range of 99.99 kΩ. The low-power dissipation, ac excitation, and four-terminal configuration make the bridge especially suitable for resistance thermometry.
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