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Metrology0.1 > 2) National Measurement System > Flashcards

2) National Measurement System Flashcards

1
Q

What was the outcome of the Metre Convention, and what were the 3 organisations created there?

A

The Metric System created

3 core organisations created:

CGPM - general conference on weights and measures

CIPM - international committee for weights and measures

BIPM - international bureau of weights and measures

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2
Q

What is the CGPM?

A
  • General conference on weights and measures.
  • Principle decision making body
  • Meets 4-6 years to endorse new developments to SI.
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3
Q

What is the CIPM?

A
  • International committee for weights and measures
  • Made up of 18 individuals from a member state to advise CPGM.
  • Responsible for running 10 committees which each investigate different areas of metrology.
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4
Q

What is the BIPM?

A
  • International Bureau of Weights and Measures
  • Custody of Kilogram prototype
  • 7 base units - no physical artifacts used anymore
  • Provides metrology services for CGPM and CIPM.
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5
Q

What is the CIPM MRA?

A

International committee for weights and measures mutual arrangement agreement - The framework through which national metrology institutes demonstrate international equivalence

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6
Q

What is the cascade affect?

A

BIPM > member states > national institute > accredited labs > Engineering companies

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7
Q

What is the UK national measurement system?

A
  • Infrastructure of labs within the UK
  • Traceable and increasingly accurate standards of measurement
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8
Q

What are the National Measurement Institutes?

A

NPL (national physical laboratory) - physical measurement: mass, length and density

NEL (national engineering laboratory) - flow and density measurement, specialise in oil

LGC (laboratory of the government chemist) - chemical and biochemical measurement

NIBSC - NI for biological standards and control - Biological medicines measurement

Legal metrology, NWMLT - trade measurements (e.g weight of food)

Laboratory accreditation - 500 uk labs accredited to provide calibration or testing services (UKAS - UK accreditation service)

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9
Q

What is measurement Traceability?

A

Trace results of measurement to a single source (national or international standard)

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10
Q

Describe the Traceability chain:

A
  1. Instrument or measuring process
  2. Working standards
  3. Secondary transfer standards
  4. NPL national standards
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11
Q

What is the purpose of Calibration?

A
  • To provide confidence in a measurement instruments accuracy and repeatability.
  • About the instrument but also includes handling info, data analysis.
  • True value never achieved.
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12
Q

What aspects of the environment affect calibration?

A
  • Temp
  • Pressure
  • Humidity
  • Vibration
  • Electrostatic fields
  • Human interaction
  • Electromagnetic Fields
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Metrology0.1 (15 decks)

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