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TRAINING FOR THE WEIGHTS AND MEASURES OFFICIAL

TRAINING FOR THE WEIGHTS AND MEASURES OFFICIAL. COURSE CURRICULUM. TRAINING FOR THE WEIGHTS AND MEASURES OFFICIAL. COURSE CURRICULUM. TRAINING FOR THE WEIGHTS AND MEASURES OFFICIAL. Module Five “Legal Metrology”. Fifth in a series of 14. General Overview.

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TRAINING FOR THE WEIGHTS AND MEASURES OFFICIAL

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  1. TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL COURSE CURRICULUM

  2. TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL COURSE CURRICULUM

  3. TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL Module Five“Legal Metrology” Fifth in a series of 14

  4. General Overview This module will introduce you to the: • Significance of Legal Metrology to Weights and Measures Officials • National and International processes used to ensure accuracy of standards in California

  5. Module Objectives Understand the origin of units of measurement Be familiar with the role NIST plays in Legal Metrology Be able to understand the concepts of accuracy, precision, and measurement uncertainty Understand the difference between mass and weight

  6. Body Parts Grains, etc. Objects Civilizations Babylonians Egyptians Anglo-Saxons Greeks Romans History Early Measurement Systems

  7. Area - Acre Volume - pint, quart, gallon Distance- Foot, yard, & mile Weight – Avoirdupois-ounce, pound, ton Troy-ounce, pound History English System of Measurement

  8. History • US Customary System • Developed from English system • Early standards brought from England • No uniform system in U.S. • Troy pound used for precious metals • Avoirdupois developed into U.S. Customary System

  9. History of Metric System • Developed after French Revolution of 1790’s • Earth used as basis in early system • Units defined rationally and related to each other • One cubic decimeter = one liter • One liter of pure water = one Kilogram

  10. History of Metric System • In 1875 “Treaty of the Meter” established the International Bureau of Weights and Measures formerly known as the French Bureau International des Poids et Measures (BIPM) • The BIPM took responsibility for the metric system and established the General Conference of Weights and Measures • Legal but not obligatory in the U.S. since 1866 • 21st Conference met in 1999

  11. International Standards Meter, Kilogram defined at the 11th General Conference in 1960 International kilogram kept at the BIPM in Serves, France Meter defined by wavelength of light Metric system now called “Systeme Internationale”

  12. Mass and Weight Mass is “Stuff” Weight is Force

  13. Organizations BIPM - Maintains international standard WMD - Interacts with state and local weights and measures NIST - Maintains U.S. standards State& Local weights and measures

  14. Organization Chart

  15. NIST Traceability

  16. California Weights & Measures Metrology Comprised of: CDFA DMS Metrology L.A. Metrology

  17. DMS Metrology Responsible for: State Standards Certification of State and County Standards Recognition of Certification Source (other labs)

  18. Standard Object, artifact, system or experiment • Physical Quantity • Basis for Measurement • Traceability • Error • Uncertainty • Environment

  19. Handbook 105 Series Handbook “Specifications and Tolerances for” Number 1. 2. 3. 4. 5. 6. 7. 8. Field Standard Weights (NIST F Class) Field Standard Measuring Flasks Graduated Neck Type Volumetric Field Standards Liquefied Petroleum Gas and Anhydrous Ammonia Liquid Volumetric Provers Field Standard Stopwatches Thermometers Dynamic Small Volume Provers Weight Carts (Draft 3) Standards – Handbook 105 Series

  20. Standards & Testing Apparatus • Interchangeable terms • HB 44 addresses standards (Appendix A) • Adequacy • Tolerances • Accuracy

  21. StandardClassifications • Sources • Intrinsic • Ratio • Accuracy Levels • Primary • Secondary • Location • National • Field • Intended Uses • Working • Transfer

  22. Traceability “Property of the results of a measurement or the value ofa standard whereby it can be related to a stated reference,through an unbroken chain of comparison all having stateduncertainties” (NIST HB143) Documentation is essential

  23. Care of Standards • Proper Care Is Important for: • Accuracy • Usefulness • Clean • Dry • Storage

  24. Summary History and development of U.S. customary and metric systems International and National Standards Organizations involved in metrology Mass and weight Standards - Care and use

  25. Conclusion This training module has provided you with a better understanding of the importance of metrology to thefield official.

  26. TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL This Concludes Module 5“Legal Metrology”

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