International comparison of AC-DC current transfer standards

Abstract

The measurements of the international comparison of ac-dc current transfer standards identified as EURAMET.EM-K12 started in June 2012 and were completed in December 2014. Twenty NMIs in the EURAMET region and one NMI in the AFRIMET region took part: BEV (Austria), CMI (Czech Republic), PTB (Germany), METAS (Switzerland), JV (Norway), UME (Turkey), GUM (Poland), IPQ (Portugal), CEM (Spain), INRIM (Italy), SP (Sweden), DANIAmet-MI-Trescal (Denmark), BIM (Bulgaria), MKEH (Hungary), SIQ (Slovenia), LNE (France), NSAI NML (Ireland), VSL (The Netherlands), NPL (United Kingdom), Metrosert (Estonia), NIS (Egypt). The comparison was proposed to link the National Metrology Institutes organised in EURAMET to the key comparison CCEM-K12. The ac-dc current transfer difference of each travelling standard had been measured at its nominal current 10 mA and 5 A at the following frequencies: 10 Hz, 55 Hz, 1 kHz, 10 kHz, 20 kHz, 50 kHz, 100 kHz. The test points were selected to link the results with the equivalent CCEM Key Comparison (CCEM-K12), through five NMIs participating in both EURAMET and CCEM key comparisons (PTB, JV, NPL, SP and BEV). The report shows the degree of equivalence in the EURAMET region and also the degree of equivalence with the corresponding CCEM reference value. 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).

Dual-Using an AC-DC Transfer Standard for Determining Current Difference of Precision Shunt

“…(11) When measuring the output signal of a thermal converter based on a thermocouple with quadratic dependence [18], a similar manipulation gives an expression Δδ S =-ΔE AC /2E DC , ( 12) where E AC and E DC are the output signals of the converter S.…”

“…In the available sources, it is difficult to assess whether and in what fo rm the standard uncertainty of Type A includes the scatter of the readout of the output signal of reference current thermal converter [18]- [20]. It is also unclear what the magnitude of this signal is and what the resolution of the applied DC voltage meter is .…”

A Power Frequency Modular Sampling Standard for Traceable Power Measurements: Comparison and Perspectives

“…The ac-dc current transfer difference of the CS-TC combination under calibration, δ (CS−TC) X I ac−dc , was calibrated against the ac-dc current transfer difference of the 5 A ac national current standard, δ (CS−TC) S I ac−dc , maintained at an uncertainty of 2.7 µA/A, which was validated in the framework of RMO key comparison EURAMET.EM-K12 [33].…”

Caracterización de convertidores digitales mediante patrones cuánticos

“…Los trabajos realizados en esta tesis han sido soportados por el Centro Español de Metrología (CEM) y parcialmente financiados por los programas de investigación de la Unión Europea, Q-wave [13], ACQ-PRO, [18] Trace-PQM [19], sus resultados están siendo aplicados en el proyecto DIG-AC [20].…”