Abstract
In this paper a measurements comparison between the National Institute of Metrological Research (INRIM), acting as pilot Laboratory, and nineteen Italian Secondary Calibration Laboratories in the field of low dc Electrical Resistance is presented and discussed. This comparison was carried out on commission by the Italian Accreditation Body of Calibration Laboratories ACCREDIA-DT. As traveling standards three Tinsley mod 3504C four terminal standard resistors to be calibrated in oil respectively at 5A and 20A (1mΩ), 1A and 5A (10mΩ), 0.1A and 1A (100mΩ) were involved. The temperatures at the measurements thermal regimen allowed a correction at 23°C of the results. The comparison results, shown graphically and as distribution of the normalized errors, were satisfactory, except in the case of a Laboratory whose measurements were outside its accreditation field.
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