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Page 733 of 936 Results 7321 - 7330 of 9356

Ewa Dziuban
HUMAN BODY TEMPERATURE MEASUREMENT-CLASS PROGRAM

Training class concerning "Human body temperature measurement" supports adequate part of lectures on Medical Measurements led by author on IX semester of speciality Metrology and Measurement Systems, faculty of Electrotechnics and Computer Science at Technical University of Rzeszow.
Author established the program of class with the aim of familiarising students with IR radiation thermometers (pyrometers): their basic principles (infrared theory), construction and basic metrological problems (spectral range, field of view, resolution, accuracy and errors). Recently the infra-red ( IR) radiation thermometers for medical application are intensively advanced and wildly distributed.

Stanislaw Dlugosz
MODELLING OF TECHNICAL OPERATION IN RELATION TO MEASURING MEANS

One can notice a great need of improvement in designing quality. This problem concerns also a specific branch of factories that produce electronic measuring instruments. We are using new generation electronic circuit, for example: the microprocessor system. They are further called "functors". Their application to get unified functional scheme of measuring instruments. Their use simplifies assembling. A short term "measuring means" is proposed in order to search uniformity of terminology. It describes technical means for measurement purposes. The MM's is created as a result of realisation of multistage process of technical operations. The process can be divided into to parts. The first one contains "creations" and another contains "products". The model presented can be useful for training future engineers with respect to creation and understanding the creation process.

Krzysztof Chrzanowski
SOFTWARE FOR EVALUATION OF UNCERTAINTY IN MEASUREMENTS

Software ASSISTANT enabling calculation of uncertainty of measurements is presented in this paper. Mathematical algorithm used by Assistant was developed according to recommendations of European Co-operation for Accreditation. Assistant is equipped with a user friendly interface and offers its users a series of examples of uncertainty calculations. Reports generated by Assistant can be saved, printed or exported to popular formats: Microsoft Word, Microsoft Excell or RTF. All these features make Assistant a useful tool in centres that implemented quality systems, in scientific laboratories or in teaching metrology.

Dariusz Buchczik, Witold Ilewicz
TEACHING OF MEASUREMENT PROCEDURES FOR SPECIALITY OF MEASUREMENT SYSTEMS IN THE INSTITUTE OF AUTOMATIC CONTROL

Ability to prepare, perform and process data obtained during an experiment is essential skill for engineers. At Measurement System Group at the Silesian University of Technology run the speciality Measurement Systems. At this speciality there is a course on Measurement Procedures. The course is performed for students of the 8th semester. The half-year lecture course is supported by classes and laboratory classes at the same semester. The lecture shows the procedures and fields of their applications. It is intended to show variety of procedures and complexity of process of choosing a proper method to the task. The aim of classes is to illustrate the lecture. There are solved hypothetical problems that refer to selected sections of the lecture. The laboratory classes are intended to develop self-reliant proficiency in using procedures on real and simulated data. Students solve problems, perform computations, comment and interpret results.

Olli Aumala
NETWORKING FOR MEASUREMENT EDUCATION

IMEKO TC1 has started a series of On Line (virtual) Workshops and a Portal for joint use of educational material. The aim of this activity is to help educators in organizing good co-operation and getting benefit of synergy in their work. The educators’ work includes classroom teaching and supervising of students, but also developing and collecting educational material, and preparing textbooks, lecture notes, exercise collections, demonstrations, etc. for educational use. Transferring new scientific results into a new form suitable for education is not a minor duty. The paper presents experience from the first Workshop and discusses needs, difficulties and methods in development of networking.

Roland Holcer, Linus Michaeli
TESTING DNL AND INL OF ADC BY THE EXPONENTIAL SHAPED VOLTAGE

Testing of ADC’s differential nonlinearity DNL(k) by the histogram method requires the signal generator with extremely low distortion and high stability of the parameters. Besides this condition generator must be connected to the input of the ADC under test with high suppression of the interfering noise on ground line of instruments. The new type of testing signal has been proposed of the exponential form which could be generated by discharging of the capacitor across the resistance. The acquired digital samples from the output of ADC under test allow determining the best fitted exponential signal. The histogram from the registered samples and that for the best fitted exponential shape allows determining the differential nonlinearity DNL(k) for any code level k. Practical problems with generating the pure exponential shape are shown in this paper. The proposed method has been experimentally verified and was compared with the standardized methods.

M. Comte, F. Azaïs, S. Bernard, Y. Bertrand, M. Renovell
ON THE EVALUATION OF ADC STATIC PARAMETERS THROUGH DYNAMIC TESTING

Full characterization of ADC requires both a histogram-based approach and a spectral analysis to determine respectively static and dynamic parameters. This paper investigates whether static performances can be extracted from spectral analysis, in order to develop a low-cost test procedure. Results show that under appropriate test conditions, the dynamic parameters extracted from a classical FFT exhibit significant variations against ADC offset and gain errors.

J. Halámek, I. Višèor, M. Kasal, M. Villa, P. Cofrancesco
HARMONIC DISTORTION AND STATISTICAL ANALYSIS

The measurement of harmonics terms on two identical digital receivers with fast ADC (AD6644) is presented and statistically analyzed. The results are discussed according to the origin of harmonics and difference between spurious and harmonics.

Carsten Wegener, Michael Peter Kennedy
TESTING ADCs FOR STATIC AND DYNAMIC NONLINEARITIES - KILLING TWO BIRDS WITH ONE STONE

Traditionally, static linearity and dynamic distortion tests are performed separately for ADCs. To this end, a low-frequency sinewave is histogrammed to measure static Integral Nonlinearity, and a high-frequency sine-wave is sampled for FFT processing to measure dynamic distortions and dynamic range.
We propose to use a model-based technique to extract both static and dynamic nonlinearities from a single data record of a sampled high-frequency sine-wave. This saves test time as the ADC converts fewer samples.

Ivo Viščor, Josef Halámek
ACQUISITION SYSTEM WITH LOW JITTER

The high dynamic range system is often limited by the jitter. The sources of the jitter are the clock generator, the clock distribution and the ADC. Two different methods of the ADC jitter measurement are presented.

Page 733 of 936 Results 7321 - 7330 of 9356