Measurement Techniques

Subject description

a) Fundamental principles and strategies of measurements;

b) Measuring accuracy and uncertainty (absolute and relative errors, measurement result, statistic analysis, measurement uncertainty);

c) Metrology systems (quantities, units and realization, etalons, disemination, traceability, calibration, conformity assessment);

d) Measurement of electrical quantities (voltage, current, power, resistance, capacitance, inductance, frequency, phase angle, power factor, frequency spectrum, …);

e) Application of basic measuring instrumentation (ammeter, voltmeter, wattmeter, oscilosscope, , etc.);

f) Structure of measuring instruments and systems (structure and elements, static and dynamic characteristics, influence quantities, analog and digital conditioning and signal processing).

g) Electronic measurement instruments (multi-meter, digital electronic osciloscop, universal counter, instrument with computer and wirtuak instrumentation) and suitable signal conditioning circuts (shunts, voltage dividers, measurement transformers, etc.);

h) Reduction of the influence of disturbing signals and measurement bridges;

i) Measurement of quantities, which define power quality (voltage sags and swings, apparent power, reactive power, etc.);

j) Measurement of non-electrical quantities (temperature, humidity, preasure, force, lenght, noise, etc.).

The subject is taught in programs

Objectives and competences

The course introduce basic knowledge of metrology and measurements of technical quantities. Objectives of the course are:

a) To introduce the basic principles of measurement of most important quantities in engineering, properties of measurement signals;

b) To introduce the basic principles of digitalization of the measurement signals in the time and frequency domain;

c) To learn the approaches and methods of measurement of basic electric quantities and caracteristics of measurement transducers;

d) To study the meaning of statistic and analysis of measurement uncertainty;

e) To study the fundamentals of metrology and metrological systems, Si units, connections with other fields of science;

f) Introduction in the laboratory-instrumentation practices and to learn the security requirements and protection in measurements.

Teaching and learning methods

Lectures, laboratory tutorials,

laboratory work in small groups,

solving practical tasks (problems).

Expected study results

After successful completion of the course, students should be able to:

a) describe the basics of metrology and measurements of electrical quantities;

b) choose the proper methods to measure basic electromagnetic quantities in the electro-power systems (voltage, current, power impedance);

c) analyze the characteristics of measurement transducers and conditioning circuits (shunts, voltage dividers, measurement transformers, etc.);

d) plan how to reduce the influence of disturbing signals in the measurement devices;

e) evaluate the measurement uncertainty and accuracy in the measurement result;

f) measure and define the power quality (voltage sags and swings, apparent power, reactive power, etc.).

Basic sources and literature

Morris A.S., Measurement and Instrumentation Principles, Third Edition, Oxford: Butterworth-Heinemann, 2010.
Tumanski S., Principles of Electrical Measurement, Taylor & Francis, CRC Press, 2006.
Bentley, J.P., Principles of Measurement Systems (4. edition), Pearson, Prentice Hall, 2005.
Agrež D. in ostali, Merilna tehnika – laboratorijski praktikum (ver. 3), University of Ljubljana, Faculty of Electrical Engineering, 2013.
Evaluation of measurement data – Guide to the expression of uncertainty in measurement International Joint Committee for Guides in Metrology, 2008, (http://www.bipm.org/en/publications/guides/gum.html).