TRAINING FOR THE WEIGHTS AND MEASURES OFFICIAL

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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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TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL

Module Five“Legal Metrology”

Fifth in a series of 14

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
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

Body Parts

Grains, etc.

Objects

Civilizations

Babylonians

Egyptians

Anglo-Saxons

Greeks

Romans

History

Early Measurement Systems

Area - Acre

Volume - pint, quart, gallon

Distance- Foot, yard, & mile

Weight – Avoirdupois-ounce, pound, ton Troy-ounce, pound

History

English System of Measurement

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
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
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
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”

Mass and Weight

Mass is “Stuff”

Weight is Force

Organizations

BIPM - Maintains international standard

WMD - Interacts with state and local weights and measures

NIST - Maintains U.S. standards

State& Local weights and measures

California Weights & Measures Metrology

Comprised of:

CDFA

DMS Metrology

L.A. Metrology

DMS Metrology

Responsible for:

State Standards

Certification of State and County Standards

Recognition of Certification Source (other labs)

Standard

Object, artifact, system or experiment

• Physical Quantity
• Basis for Measurement
• Traceability
• Error
• Uncertainty
• Environment

Handbook 105 Series

Handbook “Specifications and Tolerances for”

Number

1.

2.

3.

4.

5.

6.

7.

8.

Field Standard Weights (NIST F Class)

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
Standards & Testing Apparatus
• Interchangeable terms
• HB 44 addresses standards (Appendix A)
• Tolerances
• Accuracy
StandardClassifications
• Sources
• Intrinsic
• Ratio
• Accuracy Levels
• Primary
• Secondary
• Location
• National
• Field
• Intended Uses
• Working
• Transfer
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

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

Conclusion

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

TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL

This Concludes Module 5“Legal Metrology”