The mismatch uncertainty in microwave power sensor calibration system is analyzed. Propagation of uncertainties from the reflection coefficients in real and imaginary format are considered. Monte Carlo method (MCM) is used to estimate the probability distribution function (PDF) of the mismatch factor, which is found to be non-Gaussian for small reflection coefficient values. The mismatch uncertainties estimated using MCM for various reflection coefficient values are larger than those obtained by the method recommended in the Guide to the Expression of Uncertainty in Measurement (GUM). This study shows that MCM gives more reliable mismatch uncertainty estimation than a conventional GUM method in microwave power sensor calibration.

No abstract

No abstract

A comparison of the 10 V and 1 V Josephson array voltage standards of the Bureau International des Poids et Mesures (BIPM) was made with those of the National Metrology Centre (NMC), A*STAR, Singapore, in September 2010. For this exercise, option B of the comparison protocol was applied for the two voltages. The BIPM provided a reference voltage for measurement by the NMC, A*STAR using its Josephson standard with its own measuring device (option B of the comparison protocol). The BIPM array is floating from ground.The final results are in very good agreement within the combined relative standard uncertainty of 9.6 parts in 1011 and 0.9 parts in 109 for the nominal voltages of 10 V and 1.018 V respectively.Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm.org/.The final report has been peer-reviewed and approved for publication by the CCEM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).