ELECTRONIC MEASUREMENTS

Learning Objectives

• MODULE A

  The course aims at introducing the notions required for electronic measurements. The course deals with basic electronic measurement science and measurement techniques for main electrical quantities, measurement uncertainty, and its estimation. Metrological characteristics of measuring instrumentations, basic analog measuring instruments in AC and DC and their metrological characteristics, and measuring methods will be introduced.

  Experimental sections will be organized. Students will work in groups.

  Lessons are given in English. Basic measurement theory will be taught both in English and Italian, in order to let the student acquire the basic vocabulary of measurement science in both the languages.

  Knowledge and understaning

  The student will be able to design his measuring sections, choose the most suitable measuring tools, measuring method, and perform the measurement and the corresponding uncertainty estimation.

  Applying knowledge and understaning

  Thanks to the knowledge acquired during the module, the student will be able to estimate the value for a given electrical parameter. He will choose the most suitable measuring method and measuring instruments. He can estimate the measuring uncertainty for a measurand.

• MODULE B

  Course objectives

  The aim of the course is to provide knowledge about digital instrumentation and Automatic Measurement Systems. In particular, basic principles of A/D conversion and operational principles of digital instrumentation automatic measurement systems will be treated.

  During the course, contents related to the use of software dedicated to the development of virtual instrumentation will be provided.

  Experimental laboratory sessions will be performed in order to provide students with useful skills on the use of digital instrumentaion, Data Acquisition Systems and the development of Automatic Measurement System.

   

  Knowledge and understaning

  The acquired knowledge will make the student aware about basic mechanisms ruling measurement systems and a measurment session. Such competences allows to reach an appropriate level of maturity and autonomy for the developemnt of new solutions in the topics addressed by the course.

   

  Applying knowledge and understaning

  Thanks to the knowledge acquired during the course, the student will be able to design and use a simple Automatic Measurement System and to perform simple experimental measurement sessions by using digital instrumentation and data acquisition systems.

Course Structure

• MODULE A

  This course is organized in classroom lectures, numerical exercises, and lab expericences. Lectures will provide a theoretical understanding of metrology and measurement science. Numerical exercises, which will be worked out with the active involvement of the class, and lab experiments will be useful to better understand the theoretical part of the course. Students will be divided into groups for the lab experiments.

  Students will develop soft skills because of group activities. Written reports will be required.

  Should teaching be carried out in mixed mode or remotely, it may be necessary to introduce changes with respect to previous statements, in line with the programme planned and outlined in the syllabus.

• MODULE B

  The course is structured in theoretical lessons and experimental sessions aimed to assess the student knowledge on the course subjects. The experimental sessions will be organized in the form of work groups.

  Above mentioened approach is in line with the course objectives which aim to implement the Transfer of Knowledge on basic measurement subjects, as well as the use of such competences in real experimental scenario.

  Should teaching be carried out in mixed mode or remotely, it may be necessary to introduce changes with respect to previous statements, in line with the programme planned and outlined in the syllabus.

Detailed Course Content

• MODULE A

  Unit 1: Basic measurement theory (12)

  *Quantity, *Measure, *Measurement, *Measurement methods: direct and indirect measurement methods, *Null and deflection measurement methods, *Indication, *Metrological characteristics of a measuring instrument, *calibration diagram, *Calibration curve and instrumental measurement uncertainty, *sensitivity, *resolution, hysteresis, *precision and accuracy, repeatability and reproducibility.

  Unit 2: Uncertainty of measurement (12)

  GUM, *Uncertainty of measurement, *Type A Type B uncertainties, *Combanied standard uncerainty: uncorrelated input quantities and correlated input quantities, expanded uncertainty.

  Unit 3: DC masuring instruments and DC measuring methods (14)

  *Analog measuring instruments, *the permanent magnet-moving coil galvanometer, *milliammeter, *millivoltmeter, ammeter, voltmeter, zero-center galvanometer, accuracy class, *voltmeter-ammeter method and corresponding loading effects, *Weathstone bridge circuit, Substitution methods, *Potentiometer method for e.m.f. and current measurement, Clark's potentiometer, Kelvin-Varley potentiometer, direct reading potentiometer.

  Unità 4: AC measuring instruments (12)

  AC-DC converters: *half-wave and full-wave average reading, *half-wave and full-wave peak reading, and true rms-reding rectifiers, *Analog Oscilloscopes, *Cathoide ray tube and its senibility, *horizontal and vertical channels, *time base, *triggered sweep.

  (*) minimum required competencies.

• MODULE B

  Part I: Digital Instrumentation

  A/D conversion, sampling, quantization

  Digital instruments (Time, frequency, Voltage) (18 hours)

  A/D and D/A converters (Numeric ramp, linear ramp, follower, double ramp, flash, successive approximation)

  Digital scope

  Spectrum analyzer

  Autmatic Measurement Systems

  Data Acquistion Systems

  Distributed measurment systems (IEEE488.2)

  LabVIEW

   

  Part II: Methods (9 hours)

  • Time, frequency and phase measurments
  • First order circuit charactrization

   

  Part III: Practical Sessions (23 hours)

  • Scope measurements in the time domain
  • Scope measurements in the frequency domain
  • RC circuit characterization
  • LabView for the realization of a data acquisition system
  • RC circuit characterization by LabVIEW
  • The use of the IEEE488.2 bus
  • Development of a Automatic Measurement System

Textbook Information

• MODULE A

  1) E. Doebelin, "Strumenti e metodi di misura", Mc Graw Hill

  2) E. Doebelin, "Measurement systems", McGraw Hill

  3) G. Iuculano D Mirri, "Misure Elettroniche", CEDAM

  4) Norma UNI 4546-1984, "Misure e misurazioni"

  5) Norama UNI CEI ENV 13005:2000 "Guida all'espressione dell'incertezza di misura"

• MODULE B

  G. Zingales, “Misure elettriche: metodi e strumenti”, UTET, Torino, 1993

  G. Iuculano, D. Mirri, “Misure Elettroniche”, CEDAM 2002

  Tutorial LabVIEW

  Tutorial DAQ

  Tutorial GPIB