ELECTRONIC MEASUREMENTS

Learning Objectives

• Module A

  The course aims at introducing the notions required for electronic measurements. The course deals with basic concepts on electronic measurement science, and corresponding measurement uncertainty. The basic analog measuring instruments and their metrological characteristics will be introduced. The student will be able to design his measuring sections, to choice the most suitable meaduring tools, measuring method, end perform the measurement along with the corresponding uncertainty estimation.

• Electronic measurements

  To provide knowledge about digital instrumentation and Automatic Measurement Systems

Detailed Course Content

• Module A

  Unit 1: Basic measurement theory

  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 measuremnt uncertainty, sensitivity, resolution, hysteresis, precision and accuracy, repeatability and reproducibility.

  Unit 2: Uncertainty of measurement

  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

  Analog measuring instruments, the permanent magnet-moving coil galvanometer, milliammeter, millivoltmeter, ammeter, voltmeter, zero-center galvanometer, accuracy class, metodo volt-amperometrico, 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

  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.

• 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) J. Carr, "Elements of electronic instrumentation and measurements" 3 Ed, Prentice Hall

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

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

  7) Teacher's notes

• 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