Assessing Measurement Consistency of Reference Standards Through Intra-Laboratory En Criteria Analysis

Kiril Demerdziev, Marija Cundeva-Blajer

Abstract

Adherence to ISO/IEC 17025:2017 requires inter-laboratory comparisons and proficiency testing, alongside other measures, for ensuring test and calibration data validity. This study explores intra-laboratory comparison, as an additional quality assurance method. The presented procedure is conducted in an accredited calibration laboratory, by comparing results sourced/measured with multiple reference standards, including a high-voltage decade resistor, 8 ½ and 6 ½ digit multimeters, and a multifunction calibrator with a high-resistance measurement adapter, all of them covering the range of high resistance, above 100 MΩ. By applying the ISO/IEC 17043:2023 statistical methods and En criteria, the quantitative assessment of the measurement consistency is achieved, thus enhancing the confidence in the laboratory’s standards.

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IMEKO-TC8-11-24-2025-018.pdf

DOI

10.21014/tc11-2025.018

IMEKO TC

TC11 - Measurement in Testing, Inspection and Certification

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