Accurate calibration of resistance ratios between 1 M Omega and 1 G Omega using series resistors

作者：Yu Kwang Min^*; Ihm G

来源：Measurement Science and Technology, 2011, 22(11): 115103.

DOI：10.1088/0957-0233/22/11/115103

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

As shown in high-resistance key comparisons carried out by the Consultative Committee for Electricity and Magnetism (CCEM), Inter-American Metrology System (SIM) and European Association of National Metrology Institutes (EURAMET), the accuracy of 10 M Omega and 1 G Omega resistances depends on ratio values between the reference resistance and unknown resistance and the accuracy of the reference resistance, which is determined with a quantized Hall resistance standard. This paper presents a method for calibrating 10:1 ratios in a high-resistance bridge using series resistors simply and accurately. By applying the 10:1 ratio errors determined using the presented method, the combined relative standard uncertainty for 1 G Omega resistance measurements using a modified Wheatstone bridge was estimated to be on the 1 x 10(-6) level. The method was also applied to 1 G Omega resistance measurements using a direct-current comparator resistance bridge. It was found that the 1 G Omega resistances determined by the two bridges agreed within 2.4 x 10(-6) Omega/Omega. We expect that the presented method can also be used to calibrate arbitrary resistance ratios.

• 出版日期2011-11