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Radetic R.,Serbian Transmission System | Milivojevic D.R.,Serbian Mining and Metallurgy Institute | Brodic D.,University of Belgrade | Milivojevic N.,University of Colorado at Boulder
Przeglad Elektrotechniczny | Year: 2013

The authors designed and realized an instrument for resistance measuring using the known comparison method. As the first solution it was a single range unit for small resistors. The further investigations had a goal to reach a wide resistance range measuring. It was achieved, but some of appeared difficulties had to be overcome. The paper presents the real instrument characteristics and describes the way of practical solutions of their improvements.


Radetic R.,Serbian Transmission System | Milivojevic D.R.,Serbian Mining and Metallurgy Institute | Pavlov M.,Serbian Mining and Metallurgy Institute | Brodic D.,Technical Faculty in Bor
Journal of Electrical Engineering | Year: 2012

The article presents a way of improvement the important performances of an electronic low resistance comparator. The practical usage of a realized instrument prototype shows some disadvantages: the time until the result appears at the display is to long (the stationary state establishing sequence should be shorter) becase of the negative influence of parasitic voltages. Modification of output voltage hold circuit gives quite convenient instrument response time. The parasitic voltage disturbance is decreased to acceptable value, even though the comparator is modified for multirange measurment. The paper describes some details of a solution and its conformation in practical usage. © 2012.


Radetic R.M.,Serbian Transmission System | Milivojevic D.R.,Serbian Mining and Metallurgy Institute | Pavlov M.,Serbian Mining and Metallurgy Institute
Measurement Science Review | Year: 2010

The article describes a new control method of transistor power bridge converter. It is a new one, because of some original solutions and its difference in comparison to existing methods. It's irrelevant of load, similar to the "phase shifted" control method. It is easy to realize using ordinary electronic elements. A significant advantage of method is the possibility of permanent output current monitoring by measuring the voltage sag on a pair of transistors. That allows a very efficient current protection.


Radetic R.,Serbian Transmission System | Pavlov M.,Mining and Metallurgy Institute Bor | Milivojevic D.R.,Mining and Metallurgy Institute Bor
Elektronika ir Elektrotechnika | Year: 2012

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).

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