N Fletcher

Final report on the bilateral comparison of 1 Ω standards (ongoing BIPM key comparison BIPM.EM-K13.a) between the NIST (USA) and the BIPM

This report describes the results obtained from a NIST?BIPM bilateral comparison of 1 ? resistance standards in 2007. The comparison was carried out in the framework of the BIPM ongoing key comparison BIPM.EM-K13.a. Three BIPM 1 ? travelling standards of CSIRO type were calibrated first at the BIPM, then at the NIST and again at the BIPM after their return. The stability of the transfer standard was such that the uncertainty associated with the transfer was significantly smaller than the uncertainty arising from the calibrations. The NIST and the BIPM calibrations were found to be in good agreement, with a mean difference smaller than one standard uncertainty of the comparison. 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).

Bilateral comparison of 1 Ω standards (ongoing BIPM key comparison BIPM.EM-K13.a) between the NMIA (Australia) and the BIPM

This report describes the results obtained from a NMIA(Australia)?BIPM bilateral comparison of 1?? resistance standards in the period 2008?2009. The comparison was carried out in the framework of the BIPM ongoing key comparison BIPM.EM-K13.a. Three BIPM 1?? travelling standards of CSIRO type were calibrated first at the BIPM, then at the NMIA and again at the BIPM after their return. The stability of the transfer standards was such that the uncertainty associated with the transfer was significantly smaller than the uncertainty arising from the calibrations. The BIPM results are based on the conventional value RK-90. Those from the NMIA are traceable to a calculable capacitor. The uncertainty of the comparison includes therefore the standard uncertainty of 1???10?7 that applies to the use of the quantum Hall effect as a representation of the ohm. The NMIA and the BIPM calibrations were found to be in agreement, with a mean difference smaller than the expanded uncertainty (k = 2) of the comparison. 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).

Bilateral comparison of 10 kΩ standards (ongoing BIPM key comparison BIPM.EM-K13.b) between the NSAI–NML (Ireland) and the BIPM

This report describes the results obtained from a NML(Ireland)?BIPM bilateral comparison of 10?k? resistance standards in 2008. The comparison was carried out in the framework of the BIPM ongoing key comparison BIPM.EM-K13.b. Two BIPM 10?k? travelling standards of SR104 type were calibrated first at the BIPM, then at the NMLI and again at the BIPM after their return. The stability of the transfer standards was such that the uncertainty associated with the transfer was smaller than the uncertainty arising from the calibrations. The NMLI and the BIPM calibrations were found to be in good agreement, with a mean difference smaller than the expanded uncertainty (k = 2) of the comparison. 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).

Bilateral comparison of 10 kΩ standards (ongoing BIPM key comparison BIPM.EM-K13.b) between the CMI (Czech Republic) and the BIPM

This report describes the results obtained from a CMI–BIPM bilateral comparison of 10 kΩ resistance standards in 2008. The comparison was carried out in the framework of the BIPM ongoing key comparison BIPM.EM-K13.b. Two BIPM 10 kΩ travelling standards of SR104 type were calibrated first at the BIPM, then at the CMI and again at the BIPM after their return. The stability of the transfer standards was such that the uncertainty associated with the transfer was significantly smaller than the uncertainty arising from the calibrations. The CMI and the BIPM calibrations were found to be in good agreement, with a mean difference smaller than the standard uncertainty of the comparison. 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).