Final report on key comparison CCEM-K2 of resistance standards at 10 M  and 1 G 

Abstract

An international comparison of dc resistance at 10 MΩ and 1 GΩ was organized under the auspices of the Consultative Committee for Electricity and Magnetism (CCEM) and piloted by the National Institute of Standards and Technology (NIST, USA). This CCEM comparison began in August 1996 and was completed in March 2000 with the participation of fourteen other national metrology institutes (NMIs). The travelling package included three wirewound 10 MΩ standards and three film-type 1 GΩ standards designed by the NIST. Results indicate that the differences at 10 MΩ and 1 GΩ between each laboratory's values and the respective reference value, are all within each laboratory's expanded relative uncertainty at a coverage factor k = 2.

Validation of the ultrastable low-noise current amplifier as travelling standard for small direct currents

“…At 100 pA, standard uncertainties of about "Validation of the ultrastable low-noise current amplifier as travelling standard for small direct currents" D. Drung, C. Krause, S. P. Giblin, S. Djordjevic, F. Piquemal, O. Séron, F. Rengnez, M. Götz, E. Pesel, and H. Scherer, 2015 12 / 13 10 ppm were obtained at best. Comparisons based on 1 GΩ resistors were performed both at 100 nA [13,14] and 10 nA [15,16]. Typically, standard uncertainties of about 5 ppm are achieved with non-cryogenic methods, whereas CCC calibrations allow lower values down to about 1 ppm.…”

Linking the results of CIPM and RMO key comparisons with linear trends

“…Table 1 lists the information describing the CCEM-K2 results taken from Table 5 of [ 16 ]. In the table, the listed resistance measurements are relative deviations from the norminal value.…”

Inter-laboratory measurement comparison between INRIM and ESA on electrical quantities

“…They are also important to monitor the quality of calibration results according to [1]. ILCs can be carried out among NMIs as in [2][3][4]. Another kind of ILCs involves a NMI and secondary Laboratories of the same country accredited or not, so belonging to the same measurement system.…”