Harold Sanchez

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

An energy storage device such as an electric double layer capacitor has positive and negative electrodes, each including a blend of respective first and second activated carbon materials having distinct pore size distributions. The blend (mixture) of first and second activated carbon materials may be equal in each electrode.

SIM.EM-K4 10 pF capacitance comparison summary

A key comparison of capacitance has been carried out by the Inter-American Metrology System (SIM) Regional Metrology Organization (RMO). The purpose is to establish the degree of equivalence of capacitance between the national metrology institutes (NMIs) within SIM, in support of the International Committee for Weights and Measures (CIPM) Mutual Recognition Agreement (MRA). The key comparison artifact is a 10 pF commercial fused-silica standard capacitor. Seven SIM NMIs participated in the comparison. Results linking the SIM.EM-K4 to CCEM-K4 will show agreement of SIM NMIs to other RMOs.

An Interlaboratory Stopwatch Comparison in the SIM Region | NIST

Abstract: Stopwatches and timers are used for an almost unlimited number of applications and are among the most common devices calibrated by metrology laboratories. In large nations, stopwatch calibrations are typically handled by lower level laboratories, such as state or private laboratories in the United States. However, in smaller nations, the national metrology institute (NMI) will often accept stopwatches for calibration against the national standard. This paper describes and presents the results of an interlaboratory stopwatch comparison that was conducted by the NMIs of the Sistema Interamericano Metrologia (SIM) region from May 2010 through February 2011. The interlaboratory comparison involved two travelling stopwatches and 13 NMIs. Despite a large variation in experience, calibration methods, and instrumentation, most of the participants obtained measurement results that agreed to within 1 × 106 of the pilot laboratory.

Zener DC voltage standard pressure coefficient measurement

When a zener voltage standard is calibrated at different altitudes from that of the user laboratory, the pressure difference may introduce an uncertainty of up to 0.8 μV/V, if the pressure coefficient is not known. This paper describes the measurements performed for three zener standards and the improvement in the total uncertainty of the transferred value from a traveling one to the other two. The travelling standard has been calibrated by NMIs located at altitudes near sea level and higher, and is been used in the Designated Institute in Costa Rica, at approximately 1250 m over sea level.

Final report: Key comparison of 50/60 Hz power SIM.EM-K5

Under the auspices of the Committee Consultative of Electromagnetism, CCEM, the SIM Electromagnetic Working Group carried out a key comparison of power standards at 50/60 Hz. This key comparison, identified as SIM.EM-K5, aims to provide a link to various NMIs in the SIM region to the CCEM-K5 key comparison on 50/60 Hz power completed in 2001 and piloted by NIST. Measurements in the SIM.EM-K5 comparison were carried out from May 2010 to March 2012, including testing points of active and reactive power. CENAM was the pilot laboratory. Differences between the measurement results of the participating laboratories and the reference value of this key comparison, calculated at each of all the testing points, show a good infrastructure of national standards of measurement of electric power in the SIM region. Based on previous work, a link has been estimated between the results of the CCEM-K5 and the SIM.EM-K5 key comparisons, whose results were reported in 2002 and 2014, respectively. From the link it is shown that the measurement results of SIM.EM-K5 comparison are well supported. The SIM.EM-K5 comparison is a rewording exercise of comparison of the national standards of measurement as recommended by the CIPM. The participating laboratories are fully recommended for their enthusiastic participation in the comparison. Their individual efforts to maintain the national standards of power measurement are acknowledged. 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).

Results of the SIM.EM-K5 key comparison of 50/60 Hz power

From years 2010 to 2012, a key comparison of power standards at 50/60 Hz was conducted in the SIM region. The comparison included measurements of active and reactive power at three frequencies, aiming at providing support to high accuracy measurement needs of reactive power. This paper presents the results of the SIM.EM-K5 comparison and the assessment of the link between this comparison and the CCEM-K5 key comparison on 50/60 Hz power completed in 2001.

Final report on SIM.EM-S5: Voltage, current and resistance comparison, June 2007–October 2009

This is a report of the results of the second Interamerican Metrology System (SIM) comparison on calibration of digital multimeters, performed for strengthening the interaction among National Metrology Institutes (NMIs) and for establishing the degree of equivalence between those laboratories in accordance with the CIPM Mutual Recognition Agreement. From June 2007 to October 2009, four multimeters were used as traveling standards for measurements in eleven countries, with NIST (USA) acting as pilot laboratory. Results for nine measurement points are presented as errors relative to a comparison reference value together with their uncertainty. 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 SIM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

SIM.EM-S5 voltage, current and resistance comparison

This paper reports the results of the second Interamerican Metrology System (SIM) comparison on calibration of digital multimeters, performed for strengthening the interaction among National Metrology Institutes (NMIs) and for establishing the degree of equivalence between those laboratories in accordance with the CIPM Mutual Recognition Agreement. From June 2007 to October 2009, four multimeters were used as traveling standards for measurements in eleven countries, with NIST-USA acting as pilot laboratory. Results for nine measurement points are presented as errors relative to a comparison reference value together with their uncertainty.