May 16, 2016
We have compared a 100 Ω wire resistor with a QHR (step i = 2) using a cryogenic current comparator bridge and using a commercial DC room temperature current comparator bridge. In the latter case, the measurement was made via an intermediary (1 kΩ) wire resistor. The difference between the values obtained for the 100 Ω resistor using the two bridges is – 0.3 ± 1.4 μΩ, or – 0.003 ± 0.014 ppm.
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