The Efficient Solution of Parasitic Voltage Annulment in Electronic Low Resistance Comparator

R Radetic,M Pavlov,D R Milivojevic

doi:10.5755/j01.eee.121.5.1653

R Radetic, M Pavlov + Show 1 more

Open Access

https://doi.org/10.5755/j01.eee.121.5.1653

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Abstract

The article describes an efficient solution of parasitic voltage annulment applied in low resistance comparison. By development and design the low resistance comparator with many measuring ranges, occurred some difficulties with parasitic voltages. Theirs influence on measuring result is not negligible. To eliminate those disturbances, the analog voltage integration method is used. That is the way to nullify the parasitic voltages. Also, this electric circuit eliminates the influence of AC disturbances, which are consequence of network power supply (50 Hz frequency), independently of intensity of voltage amplifying. Ill. 6, bibl. 10, tabl. 1 (in English; abstracts in English and Lithuanian). DOI: http://dx.doi.org/10.5755/j01.eee.121.5.1653

Highlights

For low resistance measurement the comparison method is often in use
Standard methods for measurement and low resistance comparison are based on Thompson (Kelvin) bridges [1]
Authors have realized electronic low resistance comparator as a very precise instrument for resistance measuring based on comparison with referent resistor [4]

Summary

Introduction

For low resistance measurement the comparison method is often in use. This principle understands the comparison of the unknown (measured) resistance, RX with a known, referent one RR. Standard methods for measurement and low resistance comparison are based on Thompson (Kelvin) bridges [1]. Authors have realized electronic low resistance comparator as a very precise instrument for resistance measuring based on comparison with referent (known) resistor [4]. The measuring unit is realized by integration of a‘few main electronic modules (Fig. 1). Designing and developing the fixed measuring range unit, there is a possibility to choose the values of all elements (resistors and capacitors) so to eliminate the parasitic voltages, using standard electrical correction circuit (Fig. 1)

Standard correction circuit

The improved correction circuit

Findings

Conclusion