An intercomparison for electrical standards of low-frequency 50 Hz/60 Hz power has taken place within the framework of COOMET. The intercomparison, piloted by State Enterprise 'Ukrmetrteststandard'-UMTS (Ukraine), has involved thirteen laboratories, including one who is a member of another regional metrological organization: EURAMET, APMP, GULFMET, and AFRIMETS. NIM (China) and VNIIM (Russia) are linking NMIs as far as they participated in CCEM-K5. The results presented in this report appear to show that there are significant differences between some laboratories' representations of the watt. However, the agreement demonstrated by the intercomparison provides confidence in maintaining traceability for the power at 50 Hz and 53 Hz for 1.0, 0.5 Lag, 0.5 Lead, 0.0 Lag, 0.0 Lead power factors.
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 (CIPM MRA).
This report describes the results of supplementary comparison COOMET.EM-S2 (also known as regional comparison COOMET 344/UA/05) of AC power measurements at low frequency (50/53 Hz). Three participants were involved in the measurements carried out from 2008 to 2011, with the aim of supporting their Calibration and Measurement Capabilities (CMCs).The results of this comparison are described in the report. They show that the differences between almost all laboratory's values and the reference values are within the expanded measurement uncertainties at a coverage factor k = 2.
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 (CIPM MRA).
the linking process between CCEM-K5 Key Comparison and COOMET.EM-K5 Key Comparison due of participating in CCEM-K5 Key Comparison. The paper is devoted to the discussion of issues concerning the participation and further evaluation of measurement data of COOMET.EM-K5 Key Comparison of Power. Main results of participating laboratories measuring the same power of travelling standard of low-frequency 50/60 Hz power in a framework of COOMET.EM-K5 Key Comparison of Power are presented. Besides, the paper describes some problems concerning the evaluation of travelling standard drift effect and its further influence on evaluation of Key Comparison Reference Value during a Key Comparison. Degrees of Equivalence and Expanded Uncertainties of National Metrology Institutes participants are set. In addition, E n number was calculated for each National Metrology Institute participating in COOMET.EM-K5 Key Comparison of Power with the aim of determining data consistency.
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