Common Errors in Type Approval Testing of Non-Automatic Weighing Instruments for Compliance with GOST OIML R 76–1–2011

Non-automatic weighing instruments are among the most widely used mass measuring instruments. In the Russian Federation, both weighing instruments that comply with the requirements of the international standard GOST OIML R 76–1–2011 “ State System for Ensuring the Uniformity of Measurements. Non-automatic weighing instruments. Part 1. Metrological and technical requirements. Tests” and instruments manufactured according to the producer's technical documentation (hereinafter referred to as TU instruments) are permitted for use. Consequently, approaches to testing weighing instruments for type approval purposes are applied depending on the category of instrument.

However, the lack of a unified approach to testing creates conditions for unfair competition among testing centers. An analysis conducted by the Federal Agency for Technical Regulation and Metrology (Rosstandart) in 2025 identified systemic violations in the testing practices of a number of accredited centers.

The first step towards addressing these issues is the analysis presented in this article of the main errors made by testing centers during type approval testing of non-automatic weighing instruments. The review is based on the minutes of the meeting of the commission “Measurements of Mechanical Quantities” under the Federal Agency on Technical Regulating and Metrology (Rosstandart) dated September 25, 2025. Data from 26 federal and departmental regulatory documents have been systematized, including legislative acts, measurement procedures, and Russian and foreign standards.

The analysis has resulted in a consolidated explanation of the requirements of GOST OIML R 76–1–2011 for testing procedures. Particular attention is paid to the requirements for instrument protection, sample selection for testing, temperature testing with sequential heating–cooling cycles, and in-use disturbance tests. It is shown that weighing instruments manufactured not in accordance with GOST OIML R 76–1–2011 fail the conformity testing procedure to this document when its requirements are strictly observed.

This publication is based on the results of the analysis conducted by the Federal Agency on Technical Regulating and Metrology (Rosstandart), aimed at eliminating conditions for unfair competition and threats of unreliable measurement results. In 2025, the updating of GOST OIML R 76–1–2011 was initiated and continues in 2026, with the introduction of clarifications and requirements corresponding to current practice. The findings of the article can serve as a practical guide for this work. The publication is addressed to a wide audience, primarily testers, producers and users of weighing instruments.

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