UNCERTAINTY OF MEASUREMENT (Length Calibration Application)

Description. The validity of absolute measurements has little meaning unless the uncertainty of the equipment used to perform the task is known. ISO/QS-9000 and ISO/IEC 17025 require that the uncertainty of measurement is taken into account when performing calibration activities.

This course provides attendees with an understanding of the requirements of the ISO Guide to The Expression of Uncertainty in Measurement which defines methodologies to calculate uncertainty.

Objectives.  At the end of the course, the participants will be able to:
   * demonstrate the proper handling and maintenance of basic length
      measuring equipment;
   * identify the various applications of the different length measuring
      equipment;
   * identify the different sources of errors in measurement and apply
      the necessary techniques in minimizing them; and
   * compute basic uncertainty of measurements in length calibration
      based on NATA Assessment of Uncertainties of Measurement
     (with reference to ISO-GUM)

Methodology. A combination of lecture-discussion, practical exercises and hands-on will be used.

Who should attend. Small business owners, laboratory managers, metrology managers, quality managers; process, product, design and test engineers, calibration personnel, test personnel, and those who wish to gain an understanding of calculating measurement uncertainty.

Prerequisite. Knowledge on dimensional metrology.

Outline.
1. Introduction
      * General Terms
      * History of Meter
      * Basic Concepts
      * Standards
2. Philosophy of Measurement
3. Measurement Accuracy
      * ABBE Principle
      * Thermal Expansion Correction
      * Proper Handling of Measuring Instruments
      * Correct Choice of Measuring Instruments
4. Uncertainty of Measurement - Basic Concept
      * ISO Guide List of Sources of Uncertainties
      * Steps in Determining the Measurement of Uncertainty
      * Determining and Estimating the Uncertainty of Measurement
            - Type A Evaluation
            - Type B Evaluation
            - Combined Uncertainty
            - Expanded Uncertainty
            - Degrees of Freedom and Coverage Factor
5. Student's Distribution
6. Combination of Distributions
7. Important Notes in Uncertainty of Measurement Computation
8. Assessment of Compliance to Specifications
9. Expression of Uncertainty in Calibration Report
10. Exercises/Hands-on
         * Vernier Caliper
         * Outside Micrometer
         * Uncertainty Budget Computation for Vernier Caliper /
            Outside Micrometer

Duration: 24 hours