May 16, 2016
Two techniques are described for measuring resistance ratios from 1μOhm to 1G Ohm using the direct current Comparator Bridge and the binary voltage divider principles with uncertainties in the sub PPM level.
The paper outlines the advantages and disadvantages of the two techniques for use in primary standards for the measurement of resistance. Both techniques are based on the latest research performed by the National Research Council of Canada (NRCC).