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This paper describes how the Istituto Nazionale di Ricerca Metrologica (INRIM) performs the practical realisation of the ohm in order to transfer the traceability to the Italian accredited calibration laboratories in the field of dc and ac electrical resistance and of capacitance. These quantities are afterwords disseminated by the accredited laboratories to the Italian industry through the calibration...
The role of analogue-to-digital converter (ADC) boards in ac primary electrical metrology is steadily increasing. Most measurement methods, and the corresponding implementations, dedicated to measurements of electrical impedance and power often do not rely on ADCs absolute accuracy, but rather on their time and temperature stability, frequency response and mismatch among channels. The summary discusses...
The high linearity and stability of modern top-level digital multimeters (DMM) can be exploited to measure voltage ratios with very low uncertainty by making two separate absolute voltage measurements. We developed an integrated approach to apply commercial multimeters as voltage ratio standards for the dissemination of the volt over a wide range of values, based on a JAVS as primary ratio standard...
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