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High accuracy AC current sources calibration by single junction thermal converters at INM
Calibración de fuentes de corriente AC de alta exactitud por medio de convertidores térmicos de unión simple en el INM
DOI:
https://doi.org/10.15446/dyna.v88n216.86244Keywords:
Metrology, AC-DC Current Transfer Standard, Single Junction Thermal Converter, Thermal Current Converter, Alternating Current (AC), Calibration, Traceability, (en)Metrología, Patrón de transferencia de corriente AC-DC, Convertidor Térmico de Unión Simple, Convertidor térmico de corriente, Corriente Alterna (AC), Calibración, Trazabilidad (es)
The National Metrology Institute of Colombia (INM) uses high accuracy calibrators (such as Fluke 5720A/5730A) as AC current reference standards. We describe the implementation at INM of AC-DC current transfer standards by single junction thermal converters (SJTC) to improve the accuracy of AC measurements and give traceability to the International System of Units (SI) within the country. We describe the measurement model, present the uncertainty budget estimation accordingly to the Guide to the Expression of Uncertainty in Measurement (GUM) and analyze the effect of temperature and electrostatic on measurements. Expanded uncertainties between 68 μA/A and 2.6 mA/A were obtained for the calibration of high accuracy calibrators and transconductance amplifiers for currents from 5 mA to 20 A (40 Hz to 5 kHz). The obtained measurement results are compatible with calibration results from the National Metrology Institutes like Centro Nacional de Metrología from Mexico (CENAM) and Accredited International Laboratories like Fluke.
El Instituto Nacional de Metrología de Colombia (INM) cuenta con calibradores de alta exactitud (como los Fluke 5720A/5730A) como patrones de referencia de intensidad de corriente alterna (AC). En este artículo describimos la implementación en el INM de un patrón de transferencia de corriente AC-DC basado en convertidores térmicos de unión simple (SJTC) para mejorar la exactitud de las mediciones de AC y dar trazabilidad al Sistema Internacional de Unidades (SI) dentro del país. Realizamos una descripción del modelo de medición, presentación del presupuesto de incertidumbre de acuerdo con la Guía para la Expresión de la Incertidumbre de Medida (GUM) y un análisis de los efectos térmicos y electrostáticos en las mediciones. Se obtuvieron incertidumbres entre 68 μA/A y 2.6 mA/A para la calibración de calibradores de alta exactitud y amplificadores de transconductancia, para intensidades de corriente desde 5 mA hasta 20 A (40 Hz a 5 kHz). Los resultados de medición obtenidos son compatibles con los resultados de calibración de Institutos Nacionales de Metrología como el Centro Nacional de Metrología de México (CENAM) y de Laboratorios Internacionales Acreditados como Fluke.
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