Gert Rietveld and Jan van der Beek, “Active-arm Resistance Bridge with Voltage Null-detection for Precision Measurement of Resistances above 1 MΩ”, Submitted for publication in the Proceedings of the 2012 Conference on Precision Electromagnetic Measurements, Washington, US (2012).
A high-ohmic bridge for automated resistance measurements in the range between 1 MΩ and 100 GΩ is described. Whereas similar setups reported so far use current null-detection, the present bridge uses voltage null-detection leading to excellent results and uncertainties. For example, the measurement of the 1:100 ratio of a 100 MΩ Hamon device agrees within (0.5 ± 0.4) μΩ/Ω with the nominal value. The total measurement uncertainty at 1 GΩ equals 1.9 μΩ/Ω (k = 1), which has been confirmed in a recent international comparison.
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