Maintenance according to a condition based on measuring and controlling the parameters of the object condition using technical diagnostics, represents the fundament of all contemporary concepts of maintenance and most of all of proactive maintenance. This paper presents a research that has been performed in the context of a larger research projec.It shows applied methods of diagnostics and instrument characteristics and gives a brief description of their use. Furthermore, the results of

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... ents, illustrated with the photographs of observed phenomena, are shown in particular, followed by the analysis of these results.