Počet kreditů 5
Vyučováno v Winter
Rozsah výuky 2+2L
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After a brief description of the role of the most important domestic and foreign metrological organizations and institutions, explanation is focused on units of measurable quantities and possibilities of their definition, realization, conservation and reproduction by means of measurement standards. After that, attention is paid to measurement methods and techniques for evaluating and increasing measurement accuracy. Facilities and methods applicable to precision measurements of both active and passive electrical quantities are described.

1. Introduction. Physical quantities and their units. International system of units (SI).

2. Standards of electrical quantities. Quantum standards of voltage and resistance.

3. Thompson-Lampards capacitance standard. Transfer and collective standards.

4. Measurement methods.

5. Errors of direct measurements. Systematic and random errors. Allan variance.

6. Errors of indirect measurements, law of error propagation.

7. Measurement uncertainties. Law of propagation of uncertainty.

8. Evaluation of uncertainties by using a Monte Carlo method.

9. Inductive ratio devices and optimization of their metrological parameters.

10. Measurement of current. Current balance, electronic kilogram.

11. Potentiometers. Measurement of voltage and power in audiofrequency range.

12. Measurement of active electrical quantities with nonsinusoidal waveforms.

13. Bridges for measuring resistance and capacitance. Coaxial bridges.

1. Introductory exercise. Directives for metrological tests of measuring devices.

2. Calibration of digital voltmeters.

3. Calibration of resistance boxes.

4. Investigation of influence of the shield potential on parameters of capacitance standards.

5. Characterization of standards of self- and mutual inductance.

6. Thermoelectric transfer standard.

7. Collective standard of voltage.

8. Thompson-Lampards capacitance standard.

9. Application of Hamon transfer standards to precision measurement of voltage ratios.

10. Calibration of inductive voltage dividers.

11. Measurement uncertainties (examples of calculation).

12. Visit to the Czech Metrology Institute.

13. Discussion, assessment.

[1] Boháček, J.: Metrology. Publishing House of CTU, 2013.

[2] Rabinovich, S. G.: Measurement Errors and Uncertainties: Theory and Practice. Springer, 2005.

[3] Evaluation of Measurement Data - Guide to the Expression of Uncertainty in Measurement. Joint Committee for Guides in Metrology, 2008, http://www.bipm.org/utils/common/documents/jcgm/JCGM_100_2008_E.pdf.

[4] Evaluation of Measurement Data - Supplement 1 to the " Guide to the Expression of Uncertainty in Measurement" - Propagation of Distributions Using a Monte Carlo Method. Joint Committee for Guides in Metrology, 2008,

http://www.bipm.org/utils/common/documents/jcgm/JCGM_101_2008_E.pdf.

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