An Automatic DC Current Comparator Resistance Bridge

An Automatic DC Current Comparator Resistance Bridge

May 16, 2016

The principle of the Direct Current Comparator has been around for some 30 years, however, very little work has been done towards automation. This paper describes a bridge for measuring resistance ratios in the range of 0.001 ohms to 10,000 ohms using a microprocessor controlled automated DC Current Comparator with IEEE-488 to an uncertainty of better than 0.1 ppm from 1 ohm to 1000 ohms and 0.2 ppm at the 0.1 ohm and 10,000 ohm level.

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