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This paper will address the general basis for the calculation of uncertainties in the practice for testing electrical and electronic equipments using safety standards, including some calculations for typical tests.
This paper describes a technique for measuring quasi-stationary AC power signals precisely, using asynchronous techniques and basing both measurements and frequency determination at a non-zero crossing level. Both theoretical and measurement results will be compared to IEC International Standards that are based on synchronous zero-crossing techniques. Various quasi-stationary wave forms will be analyzed...
When conducting a laboratory experiment, there are various sources of error associated with the testing process. These errors need to be accounted for in order to validate the qualitative and quantitative values obtained from experimentation. The three major sources of error that are known to exist are instrumentation, human and methodological errors. Methods for determining the efficiency of induction...
A system calibrating electronic instrument transformers with analogue and digital outputs is described. Its design is based on International Electrotechnical Commission (IEC) standards 60044-7, 60044-8 and 61850-9-1. The measurement uncertainty of the system is evaluated to be less than 0.05% for ratio error and less than 2 min for phase error.
This paper describes a comparative study of induction motor testing standards IEEE 112 and newly published IEC 60034-2-1, primarily used in the United States and Europe, respectively. IEC 60034-2-1 has been refined from its earlier version IEC 60034-2 with reference to the IEEE 112. Six induction motors are tested following the two standards and the results are compared with regard to their instrumental...
The article consists of a Powerpoint presentation on uncertainty considerations in stating pass/fail. The areas discussed include: radio spectrum protection; measurement instrumentation uncertainty; radiated emission uncertainty drivers; ISO/IEC 17025-2005 etc. listing some of the slide titles.
In a previous paper we analyze the electromagnetic immunity degree of a generic virtual instrument, in particular focussing on the measurement uncertainty evaluation. The analysis was performed by means of experimental tests subjecting the instruments to the normalized disturbances prescribed by the IEC-61326 standard. In this paper, starting from the results of the experiments, we define and validate...
This paper describes a comparative study of induction motor testing standards IEEE 112 and newly published IEC 60034-2-1, primarily used in the US and Europe, respectively. IEC 60034-2-1 has been refined from its earlier version IEC 60034-2 with reference to the IEEE counterpart. Six induction motors are tested following the two standards and the results are compared with regard to their instrumental...
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