Metrology of Electrical Quantities

The course is a substitute for:

Metrology (38MET)

Lecturer:

Tutor:

Supervisor:

Department of Measurement

Synopsis:

After a brief introduction devoted to problems of legal metrology and metrological directives, explanation is focused on facilities and methods for precision measurements of electrical quantities. Considerable attention is paid to inductive ratio devices and their metrological employment. Possibilities of application of nuclear magnetic resonance, Josephson arrays and quantum Hall effect devices to precision measurements of current, voltage, resistance and capacitance are discussed.

Requirements:

Syllabus of lectures:

1. Legal metrology and its role. Convention du Metre.

2. Metrological directives and legal units of measurement.

3. Voltage inductive ratio devices and optimisation of their metrological parameters.

4. Current inductive ratio devices and optimisation of their metrological parameters.

5. Calibration of inductive ratio devices and current instrument transformers.

6. Methods for precision measurement of electrical current.

7. Methods for precision measurement of voltage. Modern potentiometers.

8. Precision measurement of voltage in audiofrequency range.

9. Precision measurement of power and energy.

10. Methods for precision DC measurements of electrical resistance.

11. Bridges with inductively coupled ratio arms for AC measurements of electrical resistance.

12. Transformer and current-comparator-based capacitance bridges.

13. Bridge methods for measuring self- and mutual inductance.

14. Metrological applications of Thompson-Lampard's theorem and quantum Hall effect.

Syllabus of tutorials:

1. Introduction.

2. Facilities for metrological tests of resistance and capacitance standards and boxes.

3. Facilities for metrological tests of multimeters.

4. Calibration of standard capacitors.

5. Calibration of a resistance box.

6. Calibration of a capacitance box.

7. Calibration of a DC digital voltmeter.

8. Linearity test of an instrument measuring ratios of AC voltages.

9. Calibration of inductive voltage dividers.

10. DC measurements of resistance ratios.

11. AC measurements of resistance ratios.

12. Measurement of self-inductance.

13. Visit to the Czech Metrological Institute.

14. Discussion of results, assessment.

Study Objective:

Study materials:

1. Elmquist, R. E. et al.: The ampere and electrical standards. J. Res. Natl. Inst. Stand. Technol., 2001, vol. 106, pp. 65-103

2. Kibble B. P. and Rayner G. H.: Coaxial AC bridges. Adam Hilger, Bristol 1984

Note:

Further information:

No time-table has been prepared for this course

The course is a part of the following study plans:

• Cybernetics and Measurements - Control Engineering- structured studies (compulsory elective course)
• Cybernetics and Measurements - Artificial Intelligence- structured studies (compulsory elective course)
• Cybernetics and Measurements - Measurement and Instrumentation Systems- structured studies (compulsory elective course)
• Cybernetics and Measurements - Aeronautical Engineering and Control Systems- structured studies (compulsory elective course)