The paper presents the method and the virtual instrument for monitoring of anticorrosion coatings performance. The developed method of component identification of the coating equivalent circuit is based on bilinear transformation. During the identification, the vector measurement of the object impedance is necessary at four selected frequencies. The analysis of optimal frequencies selection is presented assuring minimal identification error. The test results of implemented algorithm are shown. The results proved the possibility of shorten several times the testing time of anticorrosion coatings performance in relation to traditional impedance spectroscopy technique.

The digital system for the measurement of noise parameters of the communication receiver has been presented. The advantages of the presented digital method in comparison with these recommended by the norms analog methods have been given. The assesment of the digital measurement accuracy of the noise parameters has been run.

PROFIBUS is the common industrial communication network in modern industrial plants across Europe. It can be used for control of sensors and actuators. Typical example is electric drive. In this paper some experimental results of rotor position measurement and control of two electrical drives are described. Data acquisition is done over industrial communication network. Experimental results and the solution for rotor osition control and measurement of two electrical drives via PROFIBUS industrial communication network is analyzed and discussed, for two different hardware configurations.

The solution presented here enables any transducer to become symbolic. The development of this software application includes the engine that converts the measurement result and a simulator that allows the user to verify the settings before transferring them to the transducer. The application needs two types of resources: basic software resources (required for setting the numeric– symbolic conversion application) and hardware/software resources (that will host and execute the application). If the transducer is symbolic by itself, then the resources will be mainly hardware (RAM, ROM, microprocessor, microcontroller etc.). Otherwise, if only the user interface will be symbolic, the required resources are mainly software (execution capabilities, displaying routines etc.).

This paper deals with a description of a multivariable measurement system intended to be used in the freshwater fish-farming industry. The aim of the measurement system is to provide data about water temperature, water pH and oxygen dissolved in water necessary for operation of an expert system that supervises and controls the fish production process. The installed measurement equipment is connected with the expert system through a server-client type of communication via the Internet and an ability to handle multiple clients makes the whole system operable for an arbitrary number of fish farms. Access to the on-site measurement equipment via Internet enables better supervision, planning and better utilization of production resources, which results in turn with increased quality of fish, increased fish growth and bigger profits.