Measurement Analysis

Measurement Analysis - Part II, Measurement Analysis Prof....

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Part II, Measurement Analysis Prof. Tom Kuczek Purdue University Primary and Derived Measures Terminology Gage R&R Studies 1
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Fundamental Units Almost all measurements are made with, or derived from, the Fundamental Units of the SI System. These are: Meter Kilogram Second Kelvin Ampere Candela Mole 2
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SI Derived Units From the Fundamental Units are obtained the Derived Units which include among many others: Square meter Hertz Meter per Second Watt Volt Ampere per Meter Lumen,etc. 3
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How do you make measurements? Give some examples of measurements you have made and how: 4
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Primary Reference Standards For purposes of international and domestic commerce, all advanced industrial countries have a governmental organization which is responsible for maintaining the Primary Reference Standards of the SI System. In the United States, the organization is the National Institute of Standards (NIST) in Gaithersburg, VA. 5
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Hierarchy of Standards Owing to the technology required to maintain the Primary Reference Standards, a hierarchy of standards exists to relate the SI system units to the plant floor. The hierarchy is: Primary Reference Standards (maintained by NIST). Transfer Standards. Working Standards. Instruments and equipment used on plant floor. 6
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Hierarchy of Standards, cont. As we move up or down the Hierarchy of Standards, there is a trade-off in terms of cost and the “accuracy” of the measurements. A measurement at the top of the hierarchy (NIST), is the most “accurate” but the most technologically difficult and expensive.
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This note was uploaded on 02/20/2012 for the course STAT 513 taught by Professor Na during the Spring '11 term at Purdue.

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Measurement Analysis - Part II, Measurement Analysis Prof....

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