TRAINING FOR THE WEIGHTS AND MEASURES OFFICIAL

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TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL
COURSE CURRICULUM
MODULE 1 Introduction
MODULE 2 Laws Regulations
MODULE 3 Enforcement Procedures
MODULE 4 Legal Action
MODULE 5 Legal Metrology
MODULE 6 Field Standards Test Equipment
MODULE 7 Basic Weighing / Measuring Principles
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TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL
COURSE CURRICULUM
MODULE 8 Device Type Evaluation
MODULE 9 Weighing Devices
MODULE 10 Measuring Devices
MODULE 11 Weighmaster Enforcement
MODULE 12 Petroleum Products
MODULE 13 Quantity Control
MODULE 14 Service Agencies and Agents
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TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL
Module FiveLegal Metrology
Fifth in a series of 14
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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

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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
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History
Early Measurement Systems
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History
English System of Measurement
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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

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History of Metric System

• Developed after French Revolution of 1790s
• 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

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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

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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
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Mass and Weight
Mass is Stuff Weight is Force
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Organizations
BIPM - Maintains international standard WMD
- Interacts with state and local
weights and measures NIST - Maintains
U.S. standards State Local
weights and measures
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Organization Chart
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NIST Traceability
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California Weights Measures Metrology
Comprised of CDFA DMS
Metrology L.A. Metrology
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DMS Metrology
Responsible for State Standards Certification
of State and County Standards Recognition of
Certification Source (other labs)
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Standard

• Object, artifact, system or experiment

• Physical Quantity

• Basis for Measurement

• Traceability
• Error
• Uncertainty
• Environment

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Standards Handbook 105 Series
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Standards Testing Apparatus

• Interchangeable terms
• HB 44 addresses standards (Appendix A)
• Adequacy
• Tolerances
• Accuracy

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Standard Classifications

• Sources
• Intrinsic
• Ratio

• Accuracy Levels
• Primary
• Secondary

• Location
• National
• Field

• Intended Uses
• Working
• Transfer

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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
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Care of Standards

• Proper Care Is Important for
• Accuracy
• Usefulness
• Clean
• Dry
• Storage

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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
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Conclusion
This training module has provided you with a
better understanding of the importance of
metrology to thefield official.
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TRAINING FOR THEWEIGHTS AND MEASURES OFFICIAL
This Concludes Module 5Legal Metrology