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Workplace for automated conductivity measurement of liquids
Rajm, Martin ; Fialka, Jiří (referee) ; Havránek, Zdeněk (advisor)
Its aim the present Dissertation is to create a workplace for automated measurement of conductivity of liquids. Theoretical part describes principles and methods of measurement of conductivity of liquids and also measurement of temperatures of solutions. The reader is then made familiar with the program and development environment known as LabVIEW in which the measurement software has been created as well. This software serves also for the control of the LCR meter “HIOKI 3532-50” whose characteristic properties, control method and possibilities of measurement are briefly characterized in subsequent parts. The text includes also a mention about the GP-IB bus, thanks to which the LCR meter is able to communicate with PC. The actual liquid which is to be analyzed comes into contact, however, only with the four-electrode conductivity cell “WTW TetraCon 325” which is described in the Dissertation as well. The theoretical part is concluded with presentation of the multifunction card “NI USB-6008”, with the help of which the temperature of the solution analyzed is determined. In the practical part is description of the connection and explanation of the function of the measurement system as a whole. This is followed by a presentation of the actual measurement software intended for conductivity measurement. Both its structure, functions and some information about control are described there. This part of the Dissertation deals also with determination of the values of the elements of the conductivity probe replacement circuit and with the impact of measurement parameters on resulting measurement values.
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Interned based measurement system
Dobrovolný, Petr ; Kozák, Tomáš (referee) ; Zezulka, František (advisor)
The work is deal with the measuration and distribution of data using microcontroller ATmega64. The measuring system connect is done by Ethernet controller ENC28J60 in communication networks. Communication protocols TCP / IP are taken advantage of transfer data to user. Data view is dealt with the HTTP protocol through the use of HTML code. Web browser are used for disclosure of information. Web page uploading can be replenish with current analogue and digital values using the tags created for this measuring system.
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Printed circuit board tester
Stachera, Tomáš ; Havlíková, Marie (referee) ; Čejka, Miloslav (advisor)
The themes of this work is make a projection of printed circuit tester with focus on HW ans SW part of signal multiplexor . In the first part i will do general description of printed circuit board testing and on concrete example i will show connection of test system with connection of multiplexor. In the second part i will describe HW part of multiplexor board with real values of componets. In the third part i will describe SW for microcontroller and computer. In the end part i will review possibility of multiplexor and his parameters.
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Virtual Measurement System for the Anechoic Chambers
Váško, Ondřej ; Soldán, Josef (referee) ; Dřínovský, Jiří (advisor)
Master thesis examines a selected part of electromagnetic compatibility. In this work, there is theoretically discussed how electromagnetic interference appears and how is spread through free space environment. To eliminate ambient interference signals, the measurements have been performed in anechoic chamber where the undesirable interference signals were suppressed. In the thesis, there are also described parameters of EMI receivers and limits of electromagnetic interference. The description of calculations of the antenna height for finding maximum intensity of electric field strength for standard measurement distance has been made. For proposed transformed measurement distance, calculations of intensity electric field with addition of parameters measuring antenna and object under test were performed. Correction curves for conversion intensity electric field have been obtained as the result.
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Automation Measurement System
Zálešák, Marek ; Fiedler, Petr (referee) ; Štohl, Radek (advisor)
The follow text describes National Instruments Company's program LabVIEW and bus GPIB. The main part of the text solves the motion and description of software, which was created by help of LabWIEV program for Automation Measurement System. In conclusion of this work are the demonstration and results of control measurements, which were generated by this measuring system.
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Low-level measurement methods
Müller, Tomáš ; Steinbauer, Miloslav (referee) ; Fiala, Pavel (advisor)
This bachelor thesis discuss about low-level measurement methods. Also is outline the method, how to proceed in lay-out of measurement system and in selection of measurement device and its accessories. Thereinafter is stated the calculation of mistakes and in recent time also the calculation of often use mazes. Without them would be not the result total. Next part of this bachelor theses pointed to practical measurement in the area of low level current and voltage, where are shown and described wiring types used for these measurements. Next chapters discuss about measurement principles low level electric current and voltage. Than try to point to appearance, which indisposed participace on measurement accuracy and try to introduce with steps, which helps to reduce this effects. These voltages and currenties are in normal measurement insignificant, but in the low-levels influence they the result too much. Thereinafter is described the principle of measuring amplifier and closer mentioned parameters and usage of instrumentation amplifier with ultra low input bias current INA 116. Next to last point of this bachelor thesis is an example of usage this network in measurement with gerdien condenser. Therein is clarify its physical principle and proposal parameters. In the last part is described the air ions concentration measurement with gerdien condenser. Also are described the results of measurement and results of this.
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