ACCURATE CALIBRATION OF RESISTANCE RATIOS BETWEEN 1 MΩ AND 1 GΩ USING SERIES RESISTORS

• Abstract:

  This paper presents a method for calibrating 10:1 ratios in a high-resistance bridge using series resistors simply and accurately. Using the presented method, the combined relative standard uncertainty for 1 GΩ resistance measurements with a modified Wheatstone bridge was estimated to be on the 1 × 10^-6 level. The method was also applied to 1 GΩ resistance measurements using a directcurrent comparator resistance bridge. It was found that the 1 GΩ resistances determined by the two bridges agreed within 2.4 × 10-6 Ω/Ω. We expect that the presented method can also be used to calibrate arbitrary resistance ratios.
• Keywords:

  resistance ratio calibration, direct-current comparator resistance bridge, modified Wheatstone bridge, series resistors
• Download:

  IMEKO-WC-2012-TC4-P22.pdf
• DOI:

  _unreg_wc-2012.TC4-P22

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