Abstract
Compact 100-Ω metal foil dc resistors with four terminals have been developed (dimensions of 56 mm × 56 mm × 77 mm; mass of 130 g). Twelve units were characterized at a current of 1 mA over a period of one year, and the fluctuations in resistance were found to be sufficiently small to allow their use at national metrology institutes. The developed resistors have the following main characteristics: drift rate <; 0.1 (μΩ/Ω)/year , temperature coefficient <; 0.15 (μΩ/Ω)/°C at 23°C, change in resistance due to relative humidity variation <; 0.01(μΩ/Ω) in the 35%-80% range, and change in resistance due to pressure variation <; 0.025(μΩ/Ω) in the 700-1200 hPa range.
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