ELECTRONIC MEASUREMENTS

Learning Objectives

• Module A

  The course aims at introducing the notions required for electronic measurements. The course deals with basic concepts of electronic measurement science, and corresponding 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.

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

  Lessons are given in English. Experimental sections will be organizied and students will work in groups.

• Electronic measurements

  The aim of the course is to provide knowledge about digital instrumentation and Automatic Measurement Systems. In particualr, basic principles of A/D conversion and digital instrumentation will be treated. During the course experimental laboratory sessions will be performed in order to provide students with useful skills on the use of Data Acquisition Systems.

  Thanks to the knowledge acquired during the course, the student will be able to design a Data Acquisition Systems and to perform experimental measurment sessions by using digital instrumentation and Automatic Measurment Systems.

Course Structure

• Module A

  This course is organized in classroom lectures, numerical exercises, and lab expercences. Lectures will provide the theoretical understanding of metrology and measurement science. Numerical exercises, which will be worked out with the active involvment 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.

• Electronic measurements

  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.

Detailed Course Content

• Module A

  Unit 1: Basic measurement theory (10)

  *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 (14)

  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.

• Electronic measurements

  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"

• Electronic measurements

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

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

  Tutorial LabVIEW

  Tutorial DAQ

  Tutorial GPIB