Course code CTU01
Course title Metrology of Electrical Quantities
Institution Czech Technical University in Prague
Course address Czech Technical University, Faculty of Electrical Engineering, Technicka 2, CZ-166 27 Prague 6, Czech Republic
City Prague
Minimum year of study 4th year
Minimum level of English Good
Minimum level of French None
Key words Metrology, calibration, standards of electrical quantities, ratio devices, measurement methods.
Language English
Professor responsible Jaroslav BOHACEK
Telephone (4202) 2435 2220
Fax (4202) 3333 9929
Participating professors Radek Sedlacek
Number of places Minimum: 10, Maximum: 18, Reserved for local students: 0
Objectives To present an overview of modern and perspective methods for precision measurements of electrical quantities, to demonstrate various techniques used in calibrations of electrical measurement instruments and standards.
After a brief introduction devoted to fundamental problems of metrology, explanation is focussed on facilities and methods for precision measurements of electrical quantities. Possibilities of application of Josephson arrays and quantum Hall effect devices to precision measurements of current, voltage, resistance and capacitance are discussed.
Programme to be followed

Four 4-hour lectures:

1. Metre Convention. Measurement units and measurement standards. Quantum standards of voltage and resistance. Thompson-Lampard's capacitance standard. Transfer standards.
2. Voltage and current inductive ratio devices and optimization of their metrological parameters.
3. Methods for precision measurement of dc current and dc voltage. Josephson potentiometers. Measurements of voltage, power and energy in audiofrequency range.
4. Measurements of resistance, capacitance and inductance (bridges and three-voltmeter method). Metrological applications of the quantum Hall effect (QHE).

Three 2-hour laboratory demonstrations:
1. Thompson-Lampard's capacitance standard.
2. Frequency performance of resistance standards.
3. Calibration of capacitance boxes.

4-hour visit to the Czech Metrology Institute:
Calibration of digital multimeters, QHE-based calibrations of resistance standards."

Prerequisites Basic courses of applied physics and electric circuit theory.
Course exam Continuous evaluation through laboratory exercises and an evaluation test at the end of the course.