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Actual paper describes two implementation methods of an elliptical low pass filter using copper disc sectors on a PCB substrate. The main idea was to replace the series resonant branches of the filter circuit with radial stubs, which have the same equivalent circuit at high frequencies. Different approaches of the shapes and placement of the radial stubs were made during the study. Substrate material...
This paper presents the implementation of a signal generator using a 12-bit DAC. The applications were developed in LabView software and are used for transposing in a FPGA code sequences for communicating with the DAC and for analytical implementation of the generated signal. For practical implementation of the signal generator the following hardware components were used: Spartan 3E development board...
Printed circuit board layout becomes more complex because of the increased devices pin density and system frequency, respectively. A successful high-speed board must effectively integrate devices and other elements while avoiding signal transmission problems associated with high-speed I/O standards. This paper provides guidelines for effective 2.4GHz wireless Data Logger used to measured temperature,...
This paper describes the software and hardware approach for building a wireless data logger for thermal validation systems. It must meet international and European regulations for validation of pharmaceutical, biotechnology and medical device (EN 285, EN 554, HTM 2010). The temperature range is from −60°C to 150°C with total system measurement accuracy of 0.1°C for all range of measurements. These...
The vibrating wire transducer represents, basically, a damped oscillating resonant circuit tuned on the vibrating wire mechanical resonant frequency. Determining the equivalent electrical circuit for vibrating wire transducers without mutual couplings is a very important step because implementing PSPICE models for the behavior analysis cannot be made correctly with mutually coupled impedances. The...
The vibrating wire transducer represents, basically, a damped oscillating resonant circuit tuned on the vibrating wire mechanical resonant frequency and measure the majority of the physical input parameters (forces, strains etc.) in hydro-technical buildings. In order to implement an automatic data acquisition system for dams monitoring, which measures the output signal frequency of those transducers,...
Data converters are essential parts that enable communication between the external analog world and the digital devices. They should not compromise precision even though the hardware in which they are implemented relies on semiconductor devices known for their poor accuracy. Experimentation is essential to become fully acquainted with the converters performances. Theory is generally unable to quantitatively...
This article wants to reveal a new method to measure and moderate a vibrating wire transducer. Combining a complex measuring procedure that includes data acquisition and a MatLab application, it is possible to calculate the transducer's impedance. Furthermore, using higher frequencies (as the resonance frequency), respectively lower frequencies signals, the technique above evaluates correctly some...
Many products currently take advantage of microcontroller and are capable of creating an analogue - to - digital (A/D) converter with very little extra hardware or software. In effort to make the design more competitive, the typical successive approximation A/D converter (ADC), on board, can be replaced by several low - cost A/D PWM converter structure. The designer must first determine the true system...
Complex displacements in hydroelectric buildings represent the most important quantities, which define the dam stress behaviour, depending on water lake level and variations of environment temperature. For monitoring the global deformations, the dams are equipped with one or more pendulum wire, which cross the entire height of structure, in different vertical sections. The types of pendulum can be:...
To ensure the hydro-energetic building reliability, specific quantities need to be monitored. The temperature, pressure, deformation, mechanical stress, etc. are often measured using resistive gauges, spread in the whole structure of the construction. The resistive transducers are based on the resistive variation and constructive are realized by one or two resistances in serial connection. To measure...
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