- published: 10 Aug 2016
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In metrology (the science of measurement), a standard (or etalon) is an object, system, or experiment that bears a defined relationship to a unit of measurement of a physical quantity. Standards are the fundamental reference for a system of weights and measures, against which all other measuring devices are compared. Historical standards for length, volume, and mass were defined by many different authorities, which resulted in confusion and inaccuracy of measurements. Modern measurements are defined in relationship to internationally-standardized reference objects, which are used under carefully controlled laboratory conditions to define the units of length, mass, electrical potential, and other physical quantities.
There is a three-level hierarchy of physical measurement standards. At the top of the tree are the master standards - these are known as primary standards. Primary standards are made to the highest metrological quality and are the definitive definition or realization of their unit of measure. Historically, units of measure were generally defined with reference to unique artifacts which were the legal basis of units of measure. A continuing trend in metrology is to eliminate as many as possible of the artifact standards and instead define practical units of measure in terms of fundamental physical constants, as demonstrated by standardized technique. One advantage of elimination of artifact standards is that inter-comparison of artifacts is no longer required. Another advantage would be that the loss or damage of the artifact standards would not disrupt the system of measures.
Standard may refer to:
Any norm, convention or requirement
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ECL = Legal METEROLOGY Act 2009 = Standard Weights & Measurement
Nepal Bureau of Standards and Metrology Documentry
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#WorldMetrologyDay | I've a tonne of work to do
http://www.engineeringlectures.org/#!book-store/if3z4
http://www.engineeringlectures.org/#!book-store/if3z4
http://www.engineeringlectures.org/#!book-store/if3z4
A FREE Short Video By Prof. Shantanu Pethe (CACSCMA COACH) On Legal Metrology Act 2009 You can buy Lectures of Company Law, Economic & Commercial Laws, Industrial & Labour Laws or Capital Markets, Securities Laws or any other subject of CA CS CMA Courses by clicking at below Link http://www.cacscmacoach.com/buy-subjectwise Regards www.cacscmacoach.com
Nepal Bureau of Standards and Metrology Documentry
In this installment I talk about how we measure things and make sure we are all measuring the same, thanks to the wonderful world of metrology.
The kilogram is the SI base unit of mass. For more information: http://www.npl.co.uk/reference/measurement-units/si-base-units/the-kilogram-(kg) Produced in association with the Open University.
Examines the history and standard units of distance, time, weight, volume, temperature and other units of measure. Well made, interesting, and practical. https://www.youtube.com/channel/UCFdKnjmeaUvJ4ZJmENHwCCA
Irish people are not known for their accuracy – but the NSAI’s National Metrology Laboratory is. Its cutting edge calibration scientists measure thousands of instruments each year, ensuring they are accurate and precise in areas such as mass, length, temperature, pressure, voltage, resistance, noise and time. Our laboratory is based in Glasnevin, Dublin and we’ve been in existence for more than 30 years. For more information, check out NSAI.ie or follow the National Standards Authority of Ireland on Twitter @NSAI_Standards
http://www.engineeringlectures.org/#!book-store/if3z4
http://www.engineeringlectures.org/#!book-store/if3z4
http://www.engineeringlectures.org/#!book-store/if3z4
A FREE Short Video By Prof. Shantanu Pethe (CACSCMA COACH) On Legal Metrology Act 2009 You can buy Lectures of Company Law, Economic & Commercial Laws, Industrial & Labour Laws or Capital Markets, Securities Laws or any other subject of CA CS CMA Courses by clicking at below Link http://www.cacscmacoach.com/buy-subjectwise Regards www.cacscmacoach.com
Nepal Bureau of Standards and Metrology Documentry
In this installment I talk about how we measure things and make sure we are all measuring the same, thanks to the wonderful world of metrology.
The kilogram is the SI base unit of mass. For more information: http://www.npl.co.uk/reference/measurement-units/si-base-units/the-kilogram-(kg) Produced in association with the Open University.
Examines the history and standard units of distance, time, weight, volume, temperature and other units of measure. Well made, interesting, and practical. https://www.youtube.com/channel/UCFdKnjmeaUvJ4ZJmENHwCCA
Irish people are not known for their accuracy – but the NSAI’s National Metrology Laboratory is. Its cutting edge calibration scientists measure thousands of instruments each year, ensuring they are accurate and precise in areas such as mass, length, temperature, pressure, voltage, resistance, noise and time. Our laboratory is based in Glasnevin, Dublin and we’ve been in existence for more than 30 years. For more information, check out NSAI.ie or follow the National Standards Authority of Ireland on Twitter @NSAI_Standards
In this video i cover - Scientific Notation - Units of Measurement - Significant Figures - S.I Units & Unit Conversion
A talk about calibration, measurement and standards terminology. A look at my proof of concept ultimate digital multimeter check. --------------------- Click "Show more" ------------------------------- My website and forum:- http://www.mjlorton.com Donations and contributions:- http://www.mjlorton.com My techie channel MJLorton - Solar Power and Electronic Measurement Equipment - http://www.youtube.com/MJLorton My Techie Amazon Store: http://astore.amazon.com/m0711-20 My other channel VBlogMag - For almost any topic under the sun! - http://www.youtube.com/VBlogMag My VBlogMag Amazon Store: http://astore.amazon.com/vblogmag-20 ----------------------------------------------------------------------- Easy YouTube Video Downloader: https://addons.mozilla.org/en-US/firefox/addon/easy-youtube-v...
The metre (BIPM spelling), or meter (American spelling), (SI unit symbol: m), is the fundamental unit of length (SI dimension symbol: L) in the International System of Units (SI). Originally intended to be one ten-millionth of the distance from the Earth's equator to the North Pole (at sea level), its definition has been periodically refined to reflect growing knowledge of metrology. Since 1983, it has been defined as "the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second." The US yard is defined so as to be exactly 0.9144 metres. This video is targeted to blind users. Attribution: Article text available under CC-BY-SA Creative Commons image source in video
The John Michell Memorial Lecture introduced by Christine Rhone, filmed at Megalithomania in Glastonbury in May 2012. Get John's new book series on Metrology here: https://www.amazon.co.uk/Ancient-Metrology-Numerical-Metrological-Continuity/dp/1906069115. Along with John Michell, John Neal restored Ancient Metrology as a coherent system of measures, based upon fractional variations of what came to be called the English foot. His classic book, All Done with Mirrors details the system and covers many locations and examples. His later works have been essays and booklets exploring how monumental building continued to be based upon choice of a varied foot length rather than construction using a single type of measure or an arbitrary standard length, such as the 'megalithic yard'. Born 1941 stu...
An introduction to basic concepts in dimensional metrology. First it will cover the realization of the meter, angles and flat surfaces. Then we will look at concepts such as uncertainty, traceability and confidence.
MIT 8.422 Atomic and Optical Physics II, Spring 2013 View the complete course: http://ocw.mit.edu/8-422S13 Instructor: Wolfgang Ketterle In this lecture, the professor continued to talk about Bell inequality and discussed quantum metrology. License: Creative Commons BY-NC-SA More information at http://ocw.mit.edu/terms More courses at http://ocw.mit.edu
A Krohn-Hite MV106J DC Voltage Standard calibrator landed on Dave's bench. What's inside? How does it work? Is it still within spec?, and what's all this (lack of) Kelvin-Varley and LM299 zener reference stuff anyhow? And no adventure in calibration check is complete without a visit to the TrioSmartCal lab. Service Manual with schematic: http://www.eevblog.com/files/MV106%20Service%20Manual.pdf