Analysis of a national comparison in the field of electrical low dc resistance

Inter-laboratory measurement comparison between INRIM and ESA on electrical quantities

“…Normally, when in an ILC are involved an NMI and calibration Laboratories belonging to the same country, it is important to correctly evaluate the possible correlation between the measurements of the NMI and the secondary Laboratories as normally the Laboratories send their reference standards to the NMI for calibration. Suggestion for this evaluation can be found in [1,[5][6][7]10]. The ILC results are reported in Tables 1-3 Table 3.…”

“…Another kind of ILCs involves a NMI and secondary Laboratories of the same country accredited or not, so belonging to the same measurement system. The ILC reference values of these comparisons are the measurement values given by the NMI that is normally at an upper metrological level with respect the other Laboratories [5][6][7][8]. In this paper an ILC, made according to the EN ISO/IEC 17043 international Standard [9] between the National Institute of Metrological Research (INRIM) and the European space research and technology Centre (ESA-ESTEC) on DC Voltage, DC Resistance and Electrical Capacitance is presented.…”

Measurement comparisons: A tool to guarantee the reliability of measurement systems and of high-tech industry

“…This system allows checking the compatibility around all the world. Secondary laboratories accredited by national accreditation services signatory of the EA MLA 3 , besides to participate to ILCs with their NMIs or ILCs providers, can participate also to international ILCs organized by the EA 4 .…”

Applied signal effect in the potentiometric method on the resistance measurements accuracy

“…Because of increasing demand for high accuracy for industry and for the scientific metrology, more accurate measurement methods are being developed. There are different methods for measuring lowohmic resistance standards such as direct current comparator with range extender, direct reading with a digital multimeter (DMM), and substitution method [3]. There are also volt-ampere-metric and ratio technique methods.…”