Developed new technology of heat procedure for preparation pure structure of platinum wire, which produce stable resistance coefficient, stable crystalline structure sturdy against contamination of inpurities. By this technology we produce Primary Standard Platinum Resistance thermometer what present high sable resistance thermometer with stability level ±2 to 3 × 10^-4 K what is stability level of water triple point cells 273.16 ± 2 to 3 × 10^-4 K, testing device in laboratory.
This publication is based on work sponsored by the U.S.-Slovak Science and Technology Joint Fund in cooperation with Agency for International Scientific and Technological Cooperation under Project Number 93 016.

The article describes implementing of a personal computer and the LabVIEW program in measurement of temperature rising in a black corner in testing laboratories. A testing device can be considered as a complete measurement system, which can be regularly calibrated and thus providing traceable measurements. Besides the automation of the measuring process traceability is the most important category that must be considered in accredited laboratories. The whole project with its extension could change the Heating part of the standard or more likely cause an edition of a new standard describing the Testing in the Black Corner. Important standards that should be taken into consideration are SIST EN 45001 and SIST EN 45002 (identical to EN 45001 and EN 45002). They include criteria for testing laboratories. The standard SIST EN 45001 describe general criteria for testing laboratories, while the SIST EN 45002 describe general criteria for assessment of testing laboratories. As an example the measurement of heating of a kitchen-range was made in the measurement system.

This work aims to demonstrate the metrological capability of the Dimensional Metrology Laboratory of the National Institute of Metrology, Standardization and Industrial Quality (INMETRO) in the calibration of internal and external diameter standards. Reference systems are used to measure roundness, diameters, straightness of generators, squareness between a reference surface and generators and parallelism between generators. The roundness deviation is measured with a special form measuring machine, achieving a very small measurement uncertainty. The other features are measured with a system composed by a co-ordinate measuring machine (CMM) and a linear laser interferometer adapted to it.
Some technical considerations and cares that have to be taken when carrying out measurements aiming more accurate results are presented, as well as measurement results of a standard ring and a comparison between our laboratory and the ”Physikalisch- Technische Bundesanstalt ” (PTB - Germany).

The paper presents research on CMM virtual modelling applied for assessment of measurement accuracy and a method of CMM errors identification. The idea of the proposed method of error estimation is based on the measurement of a workpiece plate (hole or ball), placed in the CMM measuring area in such way, that reference points compose a spatial grid. The difference between co-ordinates of particular shape elements midpoints obtained from workpiece calibration and the coordinates given by the CMM creates the error grid. This grid is a basis for a matrix method of CMM error identification. The identification matrix corresponds to the reference points distribution. The matrix model for the CMM error identification is composed of two component parts: one - CMM errors depending on the position in the measuring area of the tested machine and the other - independent of this position. An idea of a virtual model is based on artificial neural networks. Results of comparative research into various virtual models of measuring machines have been discussed.

The paper presents the system for temperature fields analysis of coordinate measuring machines. The system should allow the following operations: temperature measurements on the surface of selected CMM units and elements according to the adopted strategy, controlling the operations of the measurement systems, conducting the calibration and correction of measurement sensors, mathematical analysis with the finite element method and graphic presentation of results.