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Power supply
Matějů, Jan ; Uher, Miroslav (referee) ; Beneš, Petr (advisor)
This work is focused on development of a laboratory power source with low output ripple, its construction and measuring its basic parameters. Basic point of interestion is systems design of a digital controled power source. Document describes problems which has occured and its solutions. Describes designing of a circuit board, its construction and measuring its parameters. Below describes system design, construction and examination of a display and keyboard for operating the device. As a result of this work is realized and measured system design, which achieved relativem low levels of output ripple, short reaction time on change of load, but slower reaction of a current limit. Some parameters has not been entirely fine-tuned, especialy speed of reaction of current limit, amplitude of output distortion volage and stability diring short circuit on output clamps.
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Flow measurement
Dvořák, Roman ; Uher, Miroslav (referee) ; Beneš, Petr (advisor)
Bachelor´s thesis is elaboration an analysis accessible small gas station. The base was meet possibilities in measurement of small flows and of them choose optima suitable solution, eventually occupy fit pump and process device. After the introduced theoretical analysis in the first part is continuing the second part, where finds enumeration me choice elements station with presented cause selection. After realization all part of system was at last parts effected calibration and setting process device part gas station. Resulting solving was collated with commercially accessible systems small gas station.
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Electromagnetic Flowmeter
Kulenda, Vít ; Uher, Miroslav (referee) ; Beneš, Petr (advisor)
Bachelor thesis describe elementary principle of electromagnetic flowmeter. It contain information about their attributes, construction, montage and using. Problem of this flowmeter are explained, which can appear during their using and building. Own constrution of electromagnetic flowmeter are part of thesis, where procedure of desing electronic circuits are decribed. In the end reports and graphs are published. Because this flowmeter are intended for laboratory, construction of vessels are contained too.
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Simulation and determination of permanent pressure loss for the normalized orifice plate
Šimberský, Michal ; Uher, Miroslav (referee) ; Šedivá, Soňa (advisor)
This master’s thesis deals with the simulation of flow through the normalized orifice plate. There is described flow measurement with flowmeters, which reduces the cross-section of the pipe and causes the pressure difference before and after the flowmeter. Following is a description methods of modeling of turbulent flow and a description of software for the simulation of flow from the company Ansys. The theoretical part is followed a practical part, which is focused on determining the permanent pressure loss caused by the orifice plate and the verification of straight pipeline lengths between orifice and obstacle.
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Measuring system for pulse tests
Brýdl, Ondřej ; Uher, Miroslav (referee) ; Klusáček, Stanislav (advisor)
In this paper is discussed impulse testing at high voltage switchgear. It focused on practical methodics of measuring, theoretical knowledge and technical terms. Further is discussed a parts of switchgear UniGear ZS1, which is most often equipment to measure. It also dealing with own measurements, process of measuring and wiring diagram. As next step, is perform trial testing with Dr Strauss system and digital osciloskope. Based on trial test, it choose digital scope and create application in in the program LabVIEW12 and debugging workstation at technical laboratory in ABB.
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Flow measurement of air by multiport averaging probes
Šimák, Jakub ; Uher, Miroslav (referee) ; Šedivá, Soňa (advisor)
Master work deals with the measurement of fluid flow (particularly air) pipe, with orifice and multiport averaging probe. The theoretical part is followed by practical, which verifies the properties of the measured system. In a next part of semestral work are verifies the properties of multiport averaging probes Vavra s.r.o. MQS-011 and Rosemount Annubar 485. Measured values from probes are compared.
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Spectrum Analyser N1996A-503 and Measurement Uncertainty
Trojan, Martin ; Uher, Miroslav (referee) ; Havlíková, Marie (advisor)
The main target of this master’s thesis is to introduce the reader with the spectrum analyzer, Agilent N1996A CSA. This work explains all the functions of this measuring instrument, control elements and presents some technical parameters. The next part of this thesis deals with the measurement of coaxial cables, so that is why a whole chapter is devoted to coaxial cables and conductors in general. The rest of this thesis deals with issues of measurement uncertainties. This part contains the general procedure for the evaluation of uncertainty, followed by a practical part. The practical part contains measurement of distance to fault and return loss. Measurements were made on 4 samples of coaxial cable. At the end of the practical parts the measured values including the uncertainties and results are summarized in the final paragraph.
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Gas flow measurement
Kozák, Matěj ; Uher, Miroslav (referee) ; Beneš, Petr (advisor)
This thesis deals with the problem of designing vortex flow meter for a nominal range of 40 l.min-1. It describes the problems of vortex bodies and choice of methods for detection of vortices. The thesis includes solution of various problems in the design, which were published in scientific articles or patents. The following describes the design solution vortex flow meter for the specified range, which uses ultrasonic sensors to vortices detection. The proposed flow meter is calibrated with reference flow meter and compared with commercially produced vortex flow by the TST electronics and Burkert companies, which are designed for the specified ranges.
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Automatic switch control unit
Zlý, Marián ; Uher, Miroslav (referee) ; Havlíková, Marie (advisor)
The main topic of this Master's Thesis is design and implementation of automatic range switch AC/DC Transfer Standart Fluke 792A. In the first part is introduce and description of character and the parameters AC/DC trasfer Standart Fluke 792A and design of the Automatic range switch for this equipment. In the next part is introduce design and description of realize automatic switch control unit it has comunication faculty witch PC over GPIB bus. In the finish part is show of the theoretic description for GPIB bus and her realization with helped microcontroller Atmega16.
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Using of accurate capacitance bridge for inductance measurements
Uher, Miroslav ; Ševčík,, Karel (referee) ; Havlíková, Marie (advisor)
This master’s thesis is dealing with possibilities of measurement of inductance by using of accurate capacitance bridge AH 2500E. In metrology there are no appropriate devices available for accurate measurement of inductance. It can be realized by four methods. The newest one is based on T elements, it is not used for this purpose yet and it is practically investigated in CMI Brno. For its introduction to practice it is neccessary to complete computer simulations and analysis of influences affecting measurement. It is also inevitable to examine repeatability of measurement, define methodology of measurement and potential corrections of measured values.
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