Measurements and Measurement Instrumentation

Subject description

a) Fundamental principles and strategies of measurements;

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

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 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 electronic measurement instrumentation. 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 define characteristics of the electronic 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 basic elements of metrology systems (quantities, units, etalons, dissemination, traceability, calibration);

b) use the basic measuring instrumentation (ammeter, voltmeter, oscilloscope, ..);

c) know how to calculate measurement accuracy and uncertainty in the measurement result;

d) analyze the structures of measuring instruments and systems ( static and dynamic characteristics, influence quantities);

e) plan the analog conditioning circuits to reduce the disturbing signals;

f) use the basic principles of digitalization of the measurement signals in the time and frequency domain: sampling, technics of A/D conversions etc.

Basic sources and literature

1. Bentley, J.P., Principles of Measurement Systems (4. edition), Pearson, Prentice Hall, 2005.

2. Morris A.S., Measurement and Instrumentation Principles, Third Edition, Oxford: Butterworth-Heinemann, 2010.

3. Agrež D. in ostali, Meritve in merilna instrumentacija – laboratorijski praktikum (ver. 3), University of Ljubljana, Faculty of Electrical Engineering, 2013.

4. Tumanski S., Principles of Electrical Measurement, Taylor & Francis, CRC Press, 2006.

5. 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).