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Comparison of the Methods Used to Low Level DC Voltage Measurement
Obšilová, Lucie
This paper deals with comparison of three methods used to measure low level DC voltage. It is about Reference Step Method, potentiometric method and direct method. Measurement was held in cooperation with the Czech metrology institute. Comparison of the methods consist of a graphic comparison and a key comparison. Results showed good agreement of all methods except for potentiometric method at one range of a device under test.
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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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Measurement uncertainty in diagnostics of insulating materials
Kamenická, Zuzana ; Rozsívalová, Zdenka (referee) ; Frk, Martin (advisor)
This work deals with measurement capacity and dissipation factor of capacitor with real dielectric in frequency range 20 Hz to 30 MHz. Liquid and solid dielectrics are measured by LCR instruments and by test fixtures, both from company Agilent. Relative permittivity and loss number are calculated for different instruments settings. The general aim is to specify the influence of parameters as frequency, voltage, integration time and thickness of material on the uncertainties of primary and secondary quantities for measurement.
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Uncertainty Calculation by the Monte Carlo Method
Kósa, Valentin ; Šedivá, Soňa (referee) ; Havlíková, Marie (advisor)
This bachelor’s diploma thesis deals with the measurement inaccuracies. Various types of uncertainty, methods, their specifications and ways of their recording are described. Next, Monte Carlo method and its application are introduced to the reader. Next, both methods described are applied: calculation of accuracy using uncertainty – GUM method and calculation of accuracy using Monte Carlo method. The methods are applied in measurements of DC current at resistive load with different meters.
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Evaluation System of Thermal Condition Environment and his Measurement Uncertainties Analyze
Košíková, Jana ; Němeček, Pavel (referee) ; Kureková, Eva (referee) ; Vdoleček, František (advisor)
The Ph.D. thesis deals with the evaluation of indoor thermal environment in which people are located. A great attention is paid to the thermal comfort. If a person in a given environment does not feel well, then makes mistakes. Thermal comfort is created many parameters that can be monitored and managed. These parameters include not only temperature but also other parameters such as the mean radiant temperature, operative temperature, humidity and air velocity and the draft. All these parameters can be measured. The standard ČSN EN ISO 7726 is written how and what the parameters are measured. Furthermore, this standard provides requirements for measuring equipment. There are many professional measuring devices. Unfortunately, these devices are very expensive. Therefore are within the project GACR 101/09/H050 - Research on energy- saving equipment to achieve the quality of the indoor environment at our faculty developed sensors for thermal comfort, which have showed comparable accuracy measurements as a professional , but it will be cheaper than professional. Knowledge of real parameters of the developed sensor thermal comfort environment is important, as with any other measurement devices, and also need to verified whether it has the required accuracy. In order to objectively sensors testing were developed two chambers - the testing and calibration chamber. The developed sensors were tested both in the open laboratory, and also in the test chamber. Then uncertainties measurement were calculated from the results of measurements This work deals with the evaluation of thermal comfort, the measurement of parameters of thermal environment, the evaluating the results of measurements and determining the measurement uncertainty of the sensors. In this thesis, based on these results, were recommended suitable sensors for measuring various parameters environment.
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Measurement system of Ripple Control (RC) signals
Čurda, Pavel ; Havránek, Zdeněk (referee) ; Šedivá, Soňa (advisor)
The thesis deals with the introduction of the measuring instrument SVA - M on the market for compliance with electromagnetic compatibility and electrical safety requirements. Furthermore it deals with determination of measuring accuracy instrument SVA - M and measurement uncertainties. For the determination of accuracy there is a theoretical analysis and subsequent practical measurements.
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Determination of measurement uncertainty nano-CMM
Brlica, Pavel ; Jankových, Róbert (referee) ; Šrámek, Jan (advisor)
The topic of this master thesis is the issue of measurement uncertainty of nano-CMM, specifically SIOS NMM-1 machine. Theoretical part of the thesis consists of basic measurement uncertainty definitions, description of approaches to CMM measurement uncertainty and differences between classical CMM and nano-CMM. For measurement uncertainty calculation of nano-CMM, two method are chosen and adapted – substitution method and Monte Carlo method. These are applied in practical part for measurement uncertainty calculation of SIOS NMM-1 machine. Part of the practical part is performed measurement on machine in laboratory at the Czech Metrology institute in Brno. The outcome of this thesis is determination of measurement uncertainty of SIOS NMM-1.
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Measurement of basic electrical variables on drives of LV circuit breakers
Mazálek, Tomáš ; Valenta, Jiří (referee) ; Bušov, Bohuslav (advisor)
This thesis has been created for the purpose of comparing calculated values by oscilloscope and by Excel. For this it was necessary to show a theory of electrical values of non-sinusoidal and aperiodic signal. There has been shown the methods of measuring of power consumption on motor operator for acquisition of relevant data. My thesis brings a wide overview, which is connected with motor operators. I am analyzing a principle of motor operator, methods of right measuring and I am describing a transfer of kinetic energy from driving motor to contacts of circuit breaker.
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Ambiguity, Vagueness, Fuzziness in Technical/Scientific Texts
Šafránek, Dominik ; Langerová, Petra (referee) ; Walek, Agata (advisor)
Dvojznačnost, vágnost a neurčitost jsou základními nástroji našeho jazyka. Mnoho prací bylo publikováno na toto téma, ale stále se setkáváme s problémy s rozlišováním mezi těmito případy. V této práci Vám poskytnu definice těchto termínů a ukážu je na příkladech, stejně tak na syntaktických testech sloužících k jejich rozlišení. Neurčitost se odlišuje od dvojznačnosti a vágnosti tím, že neimplikuje dva nebo více významů, ale neobsahuje žádnou jednoznačnou referenční hranici a nemůže být vyjasněna dáním kontextu, tj. vyjasněním zamýšleného významu. Na druhou stranu dvojznačné výrazy se liší od těch vágních tím, že obsahují dva nebo více významů, které spolu nesouvisejí sémanticky, ale vágní výrazy implikují dva nebo více významů, jejichž smysly spolu úzce – sémanticky – souvisejí. Dvojznačnost a vágnost mohou být vyjasněny dáním kontextu, tj. nezamýšlené významy mohou být eliminovány. Ačkoli dvojznačnost, vágnost a neurčitost v našem jazyce implikují nejistotu, ve vědeckých a technických textech jsou využívány. Ukážu Vám úryvek z vědeckého výzkumu s názvem ‘Inhibitory effects of different hand sanitizers against the resident microflora of skin’ a daný text zanalyzuji a budu hledat dvojznačné, vágní nebo neurčité výrazy a jejich zásah do kontextu a navrhnu řešení jak nejistotu v textu snížit nebo se ji vyhnout.
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