SIM international comparison of 50/60 Hz energy (2002–2007)

Abstract

Results of the Inter-american Metrology System (SIM) international energy comparison are presented. Participating countries were Argentina, Brazil, Canada, Costa Rica, El Salvador, Mexico, Panama, Paraguay, Peru, Uruguay and the United States.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 SIM, according to the provisions of the CIPM Mutual Recognition Arrangement (MRA).

The evaluation of main results of the RMO Key and Supplementary comparisons for electrical power and energy

“…SIM conducted SCs of AC active electric energy at lowfrequency 53 Hz in 2003-2004 (SIM.EM-S2 [22]), 2010-2011 (SIM.EM-S7 [23]) and 2018 (SIM.EM-S14 [24]). NIS (Egypt) from AFRIMET took part in the SIM.EM-S14 SC.…”

Statistical analysis for interlaboratory comparisons with linear trends in multiple loops

“…NIST was the pilot laboratory. For this SIM comparison, it was decided that measurement results from participants that obtain energy traceability from other NMIs or laboratories were not used in the CRV computation [7]. Thus, the results of ICE, SENACYT, CONACYT and SNM were excluded from the CRV computations.…”

“…The differences for the degrees of equivalence of the three laboratories with respect to CRV(1) for this artefact are The degrees of equivalence of the pair-wise comparison between any two laboratories in the whole interlaboratory comparison for all nine laboratories can be calculated by ( 16) and ( 19) with the corresponding standard uncertainties calculated by ( 17) and (20). The results are listed in table 2 with the corresponding standard uncertainties in parentheses, which can also be found in appendix A in [7].…”

“…In addition, multiple artefacts may travel through different loops to different laboratories and be measured in different time periods to save time for the whole comparison. The SIM.EM-S2 energy comparison [7] is an example. The comparison was performed at 50 Hz and 60 Hz between 11 SIM laboratories, which are NIST of USA, ICE of Costa Rica, SENACYT of Panama, CONACYT of El Salvador, CENAM of Mexico, NRC of Canada, INMETRO of Brazil, UTE of Uruguay, INTN of Paraguay, SNM of Peru and INTI of Argentina.…”