This master thesis report covers an investigation of how FPGA based hardware can be used to create customizable measurement instruments, for test of electrical equipment in JAS 39 Gripen. The investigation is done at Saab Support and Services in Arboga. Electrical equipment are gradually replacing functions, which previously have been obtained by other systems, in safety critical environments. Since the functions are safety critical, they require regular testing in order to verify proper operation. The aircraft JAS 39 Gripen, which is manufactured and developed by Saab, is an example of such system. Proper operation of the avionics in it are essential in order to maintain flying safety. There already exist systems today that can verify the functionality of electronics in JAS 39 Gripen. However, there are a number of scenarios where those test systems are somewhat inflexible. More flexible test systems are often desired. This flexibility can be obtained by using congurable hardware, suggestively with FPGAs. This approach is investigated in this master thesis.

In essence, this master’s thesis focuses on search and project on optimal electrical scheme, which will substitute for digital oscilloscope function. The thesis consist of three parts, first part is about problems associated with oscilloscope signal sampling and data bus descriptions, second part where are selected particular circuits, electrical scheme, eventually shown different options which could be used. Third part consists of software function description developed for controlling microprocessor. In choosing of analog devices, are focused on parameters like maximal input voltage on which the device has most ideal parameters, but also parameters, which are critical for particular block, like for example input impedance, device noise, operating amplifier input voltage and current offset. All devices were chosen with battery supply possibility, so what the lowest possible power consumption. In this thesis is theoretically described each circuit block and reasons for their selection.

Thesis (MScEng (Electrical and Electronic Engineering))--Stellenbosch University, 2008. / This study investigates high frequency probes through good metrology and computation software such as CST. A factor that can strongly influence the accuracy of measurements, is common mode (CM) current. Therefore, the main focus of this project was the CM current on the outside of an SMA, flanged, probe used for measuring material properties. In the course of the investigation, a clamp-on CM current probe (CP) was calibrated using a CST model and good measurements. This calibration data indicated that the CP was invasive on the measurement setup and could not deliver the accuracy required for the CM current measurement. In light of this, a second method was implemented where the material probe was placed within a cylindrical shield. A cavity was formed between the probe and the walls of the shield in which the electric fields could be simulated and measured. These field measurements allowed measurements to be conducted in both the time- (TD) and frequency-domain (FD). For the TD measurements, a sampling oscilloscope was used. As the basic principle of a sampling oscilloscope differs from its real-time counterpart, this principle, as well as the systematic errors associated with these devices, was explored. The results of the final measurements indicated that the TD results were within an acceptable range of both the FD results, measured on the VNA, and the results predicted by CST. This study shows that CST can be used to simulate complex measurement setups and deliver reliable results in cases where an accurate measurement cannot be guaranteed.

This thesis describes the design of portable multi-purpose measuring device with Microcontrollers from Microchip running on battery power, for displaying the measured signal uses a graphical LCD with a resolution of 240x128. The device is equipped with an oscilloscope and multimeter with auto range.

An increasing actor in the global energy consumption is data centers. It is estimated that by 2025, 20% of the global energy consumption will be caused by data centers and these data centers are continuously running multiple instances of different executables. This study examines the impact of compiler selection on the energy consumption of Java executables, providing insights into how sustainable software development practices can be achieved. The methodology involved compiling five tests from the Computer Language Benchmark Game and one custom test with four different compilers: Oracles Javac, OpenJDKs Javac, Eclipse Compiler for Java, and Janino. The energy consumption of each compiled executable was measured using two different approaches: Running Average Power Limit and an oscilloscope measuring the entire system. Each execution and measuring process was made ten times. Statistical analysis was made using one-way Analysis of Variance to see if there were any significant differences, and confidence intervals were calculated to see if there were any practical differences. The findings show a slight difference in energy consumption between the executables, however, there was no statistical significance or practical difference for most tests. The custom A-poster test displayed statistical significance, but the data had considerable variance detracting from this result's reliability. The findings could suggest that compiler choices have minimal impact on energy consumption, but there could potentially be some savings on a larger scale. However, the results from this study were unreliable, and further research is needed for more reliable data.

This work is focused to digital handheld oscilloscope. Input circuits are solved by analog devices. DSP (Texas Instruments company) will be used for fast processing of signals from output A/D convertors. LCD display with touch screen is used for interaction with user. The result will be fully functional device. It would measure voltage waveforms within the scope from tens mV to tens V with transmission bandwith from direct-current signal up to tens of MHz

Signal-integrity degradation from such factors as supply and substrate noise and cross talk between interconnects restricts the performance advances in Very Large Scale Integration (VLSI). To avoid this and to keep the signal-integrity, accurate measurements of the on-chip signal must be performed to get an insight in how the physical phenomenon affects the signals. High-speed digital signals can be taken off chip, through buffers that add delay. Propagating a signal through buffers restores the signal, which can be good if only information is wanted. But if the waveform is of importance, or if an analog signal should be measured the restoration is unwanted. Analog buffers can be used but they are limited to some hundred MHz. Even if the high-speed signal is taken off chip, the bandwidth of on-chip signals is getting very high, making the use of an external oscilloscope impossible for reliable measurement. Therefore other alternatives must be used. In this work, an on-chip measuring circuit is designed, which makes use of the principle of a sampling oscilloscope. Only one sample is taken each period, resulting in an output frequency much lower than the input frequency. A slower signal is easier to take off-chip and it can easily be processed with an ordinary oscilloscope.

<p>Signal-integrity degradation from such factors as supply and substrate noise and cross talk between interconnects restricts the performance advances in Very Large Scale Integration (VLSI). To avoid this and to keep the signal-integrity, accurate measurements of the on-chip signal must be performed to get an insight in how the physical phenomenon affects the signals. </p><p>High-speed digital signals can be taken off chip, through buffers that add delay. Propagating a signal through buffers restores the signal, which can be good if only information is wanted. But if the waveform is of importance, or if an analog signal should be measured the restoration is unwanted. Analog buffers can be used but they are limited to some hundred MHz. Even if the high-speed signal is taken off chip, the bandwidth of on-chip signals is getting very high, making the use of an external oscilloscope impossible for reliable measurement. Therefore other alternatives must be used. </p><p>In this work, an on-chip measuring circuit is designed, which makes use of the principle of a sampling oscilloscope. Only one sample is taken each period, resulting in an output frequency much lower than the input frequency. A slower signal is easier to take off-chip and it can easily be processed with an ordinary oscilloscope.</p>

No description available.

This diploma thesis deals with the creation of the Virtual Measuring Instruments web application. This tool mainly enables us to simulate the real measuring instruments widely used in the laboratories of FEEC BUT. It is intended to serve students for initial acquaintance with specific devices. The theoretical part is focused on the research into the web applications programming and suitable programming languages to implement the proposed application are selected. Furthermore, the specific virtualized devices are described. The result of the experimental part consists in creating a universal application interface to extend the proposed application with other devices. Finally, the specific tests of the developed platform are presented.