Problems and limitations of using DAQ systems based on PC plug-in boards for measurement of distorted waveforms in power networks

Abstract

Active compensating devices based on power electronics have been developed and used to suppress distortion of the waveform in ai power network, to improve the power factor (and to minimize line losses. It is necessary to test their efficiency for different conditions and for their other qualities in the course of this ~evel~~pment. DAQ systems based on PC plug-in boards are offen used in this case, but a number of limitations and imperfections have to be corrected or taken into account when realising of the virtual instrument in order to reach credible results. A detailed analysis of these influences is published in this paper, together with an example of a virtual insitrument which was designed and realised for this purpose. It shows the precision of results and the time of data processing that can be achieved.

Virtual Instrument - no Virtual Reality but Real PC Based Measuring System

“…The sampling rate 120 samples per period (6 kSa/s for channel) was used. The structure and basic algorithms of such VI is simple, but a number of limitations and imperfections have to be corrected or to taken into account by its design and realization to reach credible results [12].…”

Instrumentation Education In Agricultural And Biological Engineering

“…Data acquisition and digital signal processing boards are so widely available with various interesting features that even selecting the best ones to fit particular needs can be a challenging task (Jacob, 1993). High accuracy, high speed, high reliability and sophistication are sometimes important in analytical or industrial application (Haasz, 1996). However, in the undergraduate teaching laboratory proposed in this paper, PC plug-in boards may be adequate for the data acquisition system.…”