The Rockwell hardness testing scale R can be test plastic. But dead weights and load cell type of hardness tester give different results. This research focused on study of the machine operation behavior. The experiment results showed that testing cycle of load cell type hardness testing machine cannot performed according to testing condition. It causes hardness value are softer than using dead weight type.

A dead weight type Brinell-Vickers hardness standard machine was designed for TSE (Turkish Standards Institution) in the scope of TÜBITAK (The Scientific and Technological Research Council of Turkey) Project with project number 111G068. The scope of this project is mainly based on covering the requirements of a government agency by making R&D in the related field and it is funded by the TÜBITAK.
A Brinell-Vickers hardness standard machine had been previously designed and established at UME (National Metrology Institute of Turkey) Hardness Laboratory as a National Standard to provide traceability for realization of indentation for Brinell and Vickers hardness scales to be used as a reference standard in Brinell and Vickers hardness reference blocks calibration. In the new TÜBITAK Project it is aimed to design a new machine for the TSE with at least similar metrological performance to and more automatic hardness measurement capability than UME machine.
Traceability of each component constituting Brinell and Vickers Hardness scales such as force application and realization of testing cycle to national standards is provided by direct calibration. The indentation measurement system will be provided by the TSE. To realize performance tests of the machine as a whole, hardness reference blocks calibrated by the PTB (National Metrology Institute of Germany) and UME were planned to be used. In this paper Brinell-Vickers Hardness Standard Machine designed by TÜBITAK UME Hardness Laboratory for the TSE is introduced and its performance test results performed so far are interpreted.

Many accredited calibration laboratories in Turkey have extended their calibration scopes and begun to serve calibration of durometers as a result of clients’ demand. Interlaboratory comparison is one of the best ways for assuring the quality of the calibration results and a proof of the dissemination of the SI units to industry for accredited calibration laboratories. For this reason TURKAK (Turkish Accreditation Agency) and TÜBITAK UME (National Metrology Institute of Turkey) for first time had decided to organize an interlaboratory comparison which was piloted by UME Hardness Laboratory in the field of verification/calibration of durometers type A and D, the very widely used rubber hardness measurement methods in Turkey. Besides UME, 6 accredited laboratories participated in the comparison and E_n numbers for all ranges and measured quantities between the pilot and each participating laboratory were evaluated. In this paper the comparison method and results are explained.

The present article contains the results of bilateral comparisons in the field of nanoindentation conducted in 2014 in the framework of cooperation between PTB and metrological institutes of Russia. The comparisons were held using primary standard machines applied in PTB and VNIIFTRI. Hardness numbers of Martens and indentation hardness scales obtained by the two laboratories were compared with due consideration of expanded uncertainties of measurements.

The novelty of this work is the analysis of accuracy measures and its visualization especially for two parameter measurements. The parameters of the resistance-to-voltage converters, i.e. different types of DC bridge-circuits with arbitrary variable resistive sensors (of relative resistance increments) and their accuracy measures are presented. Transfer coefficients, limited error and also standard uncertainty as the functions of relative increments of resistances are considered in a broad range for different types of supply and for different configurations of sensors.