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A dual slope direct digital converter (DDC) suitable for resistive sensor elements already connected in the form of a Wheatstone bridge is presented here. The proposed DDC accepts the whole bridge as an integral part of a dual slope analog to digital converter and provides a digital value proportional to the input quantity being sensed by the four resistive sensing elements of the bridge. Simulation...
Instrument transformers, namely, current and voltage (potential) transformers are characterized by their ratio and phase errors. A novel virtual instrument that determines the errors of an instrument transformer using a quasi-balance technique is proposed in this paper. Operating on the secondary quantities of the test and standard transformers, two independent quasi-balance conditions are obtained...
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