Uncertainty of potential measurements of Q-constant objects

[摘要] Direct and compensating methods of non-contact potential measurements on constant charge objects are distinguished and discussed in the paper. It is well known that in case of potential measurements using direct method the measured voltage value is lower in comparison to that in a non disturbed state. However in case of application of a compensating method, values of measured potential are higher. It is shown that in both of discussed cases approaching of the conducting object by the particular voltmeter (probe) leads to changes of the total capacitance of the object. Approximated relations for estimation of relative error of potential measurements for both of distinguished groups of methods were also given.

[发布机构] Department of Electrical Engineering Fundamentals, Wroclaw University of Technology, Wyb. Wyspianskiego 27, Wroclaw; 50-370, Poland^1

[效力级别] 数学

[关键词] Compensating method;Conducting objects;Constant charges;Direct method;Measured voltages;Non-contact;Potential measurements;Relative errors