laboratory of precision electrical measurements, ctu - fee in prague athens programme metrology of...

Laboratory of Precision Electrical Measurements , CTU - FEE in Prague

Athens ProgrammeAthens ProgrammeAthens ProgrammeAthens Programme

Metrology of Electrical QuantitiesMetrology of Electrical Quantities

Laboratory of PreciLaboratory of Precisionsion Electrical Measurements Electrical MeasurementsDepartment of MeasurementsDepartment of MeasurementsFaculty of Electrical EngineeringFaculty of Electrical EngineeringCzech Technical University in PragueCzech Technical University in Prague

Responsible professor:Prof. Ing. Jaroslav Bohacek, DrSc.Phone +420 22435 2220E-mail [email protected]

http://measure.feld.cvut.cz/...


William Thomson, Lord KelvinWilliam Thomson, Lord Kelvin

I often say that when you can measure what you are speaking I often say that when you can measure what you are speaking about, and express it in numbers, you know something about about, and express it in numbers, you know something about it …it …

… … but when you cannot measure it, when you cannot express but when you cannot measure it, when you cannot express it in numbers, your knowledge is of a meagre and it in numbers, your knowledge is of a meagre and unsatisfactory kind.unsatisfactory kind.


Brian W. PetleyBrian W. Petley

Far from being a dull area of science, high-precision Far from being a dull area of science, high-precision measurements are an increasingly exciting area in which to measurements are an increasingly exciting area in which to work, for they push theory and experiment to the very limits of work, for they push theory and experiment to the very limits of which they are capable…which they are capable…

If we recall that the rich oil deposits under the North Sea If we recall that the rich oil deposits under the North Sea remained unknown until the advent of the very precise remained unknown until the advent of the very precise geophysical measurements, or that the spin of the electron geophysical measurements, or that the spin of the electron was inferred from precise spectroscopic measurements, we was inferred from precise spectroscopic measurements, we see more clearly the class of discoveries which can come see more clearly the class of discoveries which can come from precise measurement.from precise measurement.


CourseCourseobjectivesobjectives LecturesLectures

PreviousPreviousintrointro

LaboratoryLaboratorydemonstrationsdemonstrations

LaboratoryLaboratoryvisitvisit

What isWhat ismmetrologyetrology??

Please, select some topic above to continuePlease, select some topic above to continue


Laboratory demonstrationsLaboratory demonstrations

1.1. Thompson-Lampard's capacitance standardThompson-Lampard's capacitance standard

2.2. Frequency performance of resistance standards Frequency performance of resistance standards

3.3. Calibration of capacitance boxesCalibration of capacitance boxes


Course objectives:Course objectives:

to present an overview of modern and perspective methods for to present an overview of modern and perspective methods for precision measurements of electrical quantities,precision measurements of electrical quantities,

to demonstrate various techniques used in calibrations of to demonstrate various techniques used in calibrations of electrical measurement instruments and standards.electrical measurement instruments and standards.


LLecturesectures

Lecture 1Lecture 1

IntroductionIntroduction

Measurement units and measurement standardsMeasurement units and measurement standards

Quantum standards of voltage and resistanceQuantum standards of voltage and resistance

Thompson-Lampard's capacitance standardThompson-Lampard's capacitance standard

Equivalent circuits of standard resistors, capacitors and Equivalent circuits of standard resistors, capacitors and inductorsinductors

Resistors with calculable frequency performanceResistors with calculable frequency performance

Transfer standardsTransfer standards


LLecturesectures

Lecture 2Lecture 2

Voltage and current inductive ratio devices and optimization of Voltage and current inductive ratio devices and optimization of their metrological parameters.their metrological parameters.


LLecturesectures

Lecture 3Lecture 3

Methods for precision measurement of dc current and dc voltageMethods for precision measurement of dc current and dc voltage

Modern potentiometersModern potentiometers

Measurement of voltage, power and energy in audiofrequency Measurement of voltage, power and energy in audiofrequency rangerange


LLecturesectures

Lecture 4Lecture 4

Bridges for dc and ac measurements of resistanceBridges for dc and ac measurements of resistance

Transformer and current-comparator-based capacitance bridgesTransformer and current-comparator-based capacitance bridges

Metrological applications of the quantum Hall effect (QHE)Metrological applications of the quantum Hall effect (QHE)


What is Metrology?What is Metrology?

Metrology is the science of measurement.Metrology is the science of measurement.



Metrology covers Metrology covers three main activitiesthree main activities::

1.1. The The definitiondefinition of internationally accepted units of measurement, of internationally accepted units of measurement, e.g. the metre.e.g. the metre.

2.2. The The realizationrealization of units of measurement by scientificof units of measurement by scientific methods, methods, e.g. the realizatione.g. the realization of a metre through the use of lasers.of a metre through the use of lasers.

3.3. The establishment of The establishment of traceabilitytraceability chains by determining and chains by determining and documenting the value and accuracy of a measurement and documenting the value and accuracy of a measurement and disseminating that knowledge, e.g. the documented relationship disseminating that knowledge, e.g. the documented relationship between the micrometer screw in a precision engineering between the micrometer screw in a precision engineering workshop and a primary laboratory for optical length metrology.workshop and a primary laboratory for optical length metrology.


1.1. Scientific metrologyScientific metrology deals with the organisation and deals with the organisation and development of measurementdevelopment of measurement standards and with their standards and with their maintenance (highest level).maintenance (highest level).

2.2. Industrial metrologyIndustrial metrology has to ensure the adequate functioning of has to ensure the adequate functioning of measurementmeasurement instruments used in industry as well as in instruments used in industry as well as in production and testing processes. production and testing processes.

3.3. Legal metrologyLegal metrology is concerned with measurements where these is concerned with measurements where these influence theinfluence the transparency of economic transactions, health and transparency of economic transactions, health and safety.safety.


Metrology is considered in Metrology is considered in three categoriesthree categories with different with different levels of complexity and accuracy:levels of complexity and accuracy:


Systematic measurement with known degrees of uncertainty Systematic measurement with known degrees of uncertainty is one of the foundations of industrial quality control and, is one of the foundations of industrial quality control and, generally speaking, in most modern industries the costs generally speaking, in most modern industries the costs bound up in taking measurements constitute 10 -15% of bound up in taking measurements constitute 10 -15% of production costs.production costs.


Laboratory visit:Laboratory visit:

Czech Metrology InstitueCzech Metrology Institue

Calibration of digital multimeters Calibration of digital multimeters

Quantum Hall effect based calibrations of resistance standardsQuantum Hall effect based calibrations of resistance standards

www.cmi.czwww.cmi.cz

Laboratory of Precision Electrical Measurements , CTU - FEE in PragueLaboratory of Legal Metrology, CTU Prague

See you in Prague!See you in Prague!

laboratory of precision electrical measurements, ctu - fee in prague athens programme metrology of...

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