The paper presents the family of three analyzers allowing to measure impedance in the range of 10 Ω<|Z x |<10 GΩ in a wide frequency range from 10 mHz up to 100 kHz. The most important features of the analyzer family are: miniaturization, low power consumption, low production cost, telemetric controlling and the use of an impedance measurement method based on digital signal processing (DSP). The miniaturization and other above-mentioned features of the analyzers were obtained thanks to the use of the newest generation of large-scale integration chips: e.g. "system on a chip" microsystems (AD5933), 32-bit AVR32-family microcontrollers and specialized modules for wireless communication using the ZigBee standard. When comparing metrological parameters, the developed instrumentation can equal portable analyzers offered by top worldwide manufacturers (Gamry, Ivium) but outperforms them on smaller dimensions, weight, a few times lower price and the possibility to work in a distributed telemetric network. All analyzer versions are able to be put into medium-volume production.

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This paper presents a virtual instrument for measuring the impedance parameters of high impedance objects (|Z x | 10 G ). A method of component identification of multi-element two-terminal networks has been developed on the basis of bilinear transformation. The method is dedicated to parameter identification of different kinds of anticorrosion coatings. During the identification, the vector measurement of the object impedance is necessary at a few selected frequencies, equal to the number of elements under identification. The analysis of optimal frequencies selection is presented ensuring minimal identification error. The test results from the implemented algorithm are shown. The results proved the possibility of shortening the anticorrosion coating performance testing time by several orders in relation to the traditional impedance spectroscopy technique. A digital signal processing technique has been used in the virtual instrument for determination of the orthogonal parts of the measurement signals. It allows us to achieve a wide range of measurement frequencies, especially very low, from 1 MHz to 100 µHz. In order to measure impedance in the range 100|Z x | 10 G with an error not exceeding 2.5%, an input circuit based on a current-to-voltage converter has been used.The use of modern electronic components combined with digital signal processing techniques resulted in a low-cost instrument for measurement parameters allowing widespread use in impedance spectroscopy for many technical objects.

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