1. Rzeszow University of Technology, Faculty of Electrical and Computer Engineering, Department of Metrology andDiagnostic Systems, Wincentego Pola, 2A, 35-959 Rzeszow, Poland
2. Lviv Polytechnic National University, Institute of Computer Technologies, Automation and Metrology, Department ofInformation Measuring Technology, Bandera str., 12, 79013 Lviv, Ukraine