The analyze of the stationary regime of non-linear circuits excited with periodical signals is difficult, on one hand because into the general solutions of the differential non-linear equation system the components of the stationary regime can not be separated, and on the other hand because of the different structure of the response signal and of the excitation signal. Characteristically for the non-linear element is the fact that between the input parameter and the output parameter do not exist a proportionality relation. A particular case is the non-linear resistance. This circuit element is defined by the fundamental terms of the trigonometric series of voltage and current. The characteristics of non-linear resistance are approximated by a polynomial and the paper presents a method for determining the polynomial's coefficients to compute the non-linear and the static resistance, corresponding to a periodical current excitation applied to the non-linear resistor, by the technique of multiple synchronous detection. In the second part of the paper is presented an instrument for measurement in virtual technique the non-linear and static resistance, implemented in LabVIEW graphical programming software. The solution allows a quick and convenient measurement of these important circuit components, together with an appropriate graphical representation. The performances of this measurement technique are: easiness of design, flexibility of interconnection of signal processing software blocks, clear presentation of the results in the front panel of the instrument and, last but not least, accuracy of the measurement data software processing.
This paper presents how test systems could be implemented in order to lower the investment cost, increase the test throughput, and scale with future requirements. In order to achieve all this, the test system architectures are based on modular, virtual instrumentation reconfigurable levels, which provide the code and equipment reuse for different test scenarios. The example shown points out the modular test architecture's layers that are used when testing the functionality of the compact FieldPoint 2020 controller. A more detailed approach is offered to the implementation of the test applications and to the automated test sequence.
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