Metrology Metrology AFMETCAL (Air Force METrology and CALibration Program Office), located in Heath, Ohio is the primary manager of metrology services for the U.S. Air Force. It retains engineering authority for all calibrations performed in the PMEL labs throughout the Air Force, and manages the contractor operated Air Force Primary Standards Lab. It currently operates as the 542 Combat Support Wing for Warner Robbins AFB. ...more on Wikipedia about "AFMETCAL"
The Allan variance, named after David W. Allan, is a measurement of accuracy in clocks. It is also known as the two-sample variance. ...more on Wikipedia about "Allan variance"
* Katz, S. A., Bowen's Kale: A brief review dedicated to the late Professor Humphry John Moule Bowen, 1929–2001 . Journal of Radioanalytical and Nuclear Chemistry, 251(1):3–5, January 2002. ...more on Wikipedia about "Bowen’s Kale"
A caesium standard is a primary frequency standard in which electronic transitions between the two hyperfine ground states of caesium-133 atoms are used to control the output frequency. ...more on Wikipedia about "Caesium standard"
Calibration refers to the process of setting the magnitude of the output (or response) of a measuring instrument to the magnitude of the input property or attribute within specified accuracy and precision. For example, a thermometer could be calibrated so that it showed the temperature in celsius at the correct point. ...more on Wikipedia about "Calibration"
CODATA (Committee on Data for Science and Technology) was established in 1966 as an interdisciplinary committee of the International Council of Science (ICSU), formerly the International Council of Scientific Unions. It seeks to improve the compilation, critical evaluation, storage, and retrieval of data of importance to science and technology. ...more on Wikipedia about "CODATA"
Coordinate-measuring machines are mechanical systems designed to move a measuring probe to determine the coordinates of points on the surface of a workpiece. Coordinate-measuring machines consist of four main components: the machine itself, the measuring probe, the control or computing system, and the measuring software. They are often used for dimensional measurement, profile measurement, angularity or orientation measurement, depth mapping, digitizing or imaging, and shaft measurement. They are offered with features like crash protection, offline programming, reverse engineering, shop floor suitability, SPC software and temperature compensation. The machines are available in a wide range of sizes and designs with a variety of different probe technologies. They can be controlled and operated manually, or by CNC or PC controls. They are offered in various configurations such as benchtop, free-standing, handheld and portable. ...more on Wikipedia about "Coordinate-measuring machine" Be happy with shortopedia Metrology
The Department of Defense master clock is the master clock to which time and frequency measurements for the United States Department of Defense are referenced, that is to say, are traceable. ...more on Wikipedia about "Department of Defense master clock"
The word error has different meanings in different domains. Current meanings in some of those domains are described below. The Latin word error meant "wandering" or "straying". ...more on Wikipedia about "Error"
In statistics, the concepts of error and residual are easily confused with each other. ...more on Wikipedia about "Errors and residuals in statistics"
Grade measurement is the geodetic determination of the local radius of curvature of the figure of the Earth by determining the difference in astronomical latitude between two locations on the same meridian, the metric distance between which is known. ...more on Wikipedia about "Grade measurement"
See Systems of measurement for a detailed listing of historical measurement systems. The origin and development of units of measurement has been investigated in considerable detail and a number of books have been written on the subject. It is only possible to give here, somewhat sketchily, the story about a few units. ...more on Wikipedia about "History of measurement"
The International Bureau of Weights and Measures is the English name of the Bureau international des poids et mesures (BIPM, often written in English Bureau International des Poids et Mesures), a standards organization, one of the three organizations established to maintain the International System of Units ( SI) under the terms of the Convention du Mètre (Metre Convention). Note that the abbreviation IBWM does not exist. ...more on Wikipedia about "International Bureau of Weights and Measures"
The International Organization of Legal Metrology or Organization Internationale de Métrologie Légale (OIML) is an intergovernmental treaty organization. It is made up of approximately 60 nations from around the world. ** . Established in 1955, its goal is to promote the standarization of legal metrology. ...more on Wikipedia about "International Organization of Legal Metrology" This text is made for http://www.shortopedia.com
Land measurement is the general concept describing the application and theory of measurement of land. Surveying is an important component of land measurement. ...more on Wikipedia about "Land measurement"
The level of measurement of a variable in mathematics and statistics is a classification that was proposed in order to describe the nature of information contained within numbers assigned to objects and, therefore, within the variable. The levels were proposed by Stanley Smith Stevens in his 1946 article On the theory of scales of measurement. Different mathematical operations on variables are possible, depending on the level at which a variable is measured. According to the classification scheme, in statistics the kinds of descriptive statistics and significance tests that are appropriate depend on the level of measurement of the variables concerned. ...more on Wikipedia about "Level of measurement"
The long-term stability of an oscillator, the degree of uniformity of frequency over time, when the frequency is measured under identical environmental conditions, such as supply voltage, load, and temperature. Long-term frequency changes are caused by changes in the oscillator elements that determine frequency, such as crystal drift, inductance changes, and capacitance changes. ...more on Wikipedia about "Long-term stability"
The margin of error is an estimate of a poll's variance in reported percentages if the same poll were taken multiple times. The larger the margin of error, the less confidence one has that the poll's reported percentages are close to the "true" percentages, that is the percentages in the whole population. ...more on Wikipedia about "Margin of error"
A Measurand is a physical parameter being quantified by measurement. ...more on Wikipedia about "Measurand"
Analysis of the complete process of obtaining measurements. This includes the collection of equipment, operations, procedures, software and personnel that affects the assignment of a number to a measurement characteristic. Includes, but is not limited to, Gage R&R ...more on Wikipedia about "Measurement Systems Analysis"
The measurement uncertainty fixes the accuracy of a physical measurement. The result of any physical measurement comprises two parts, an estimate of the true value of the measurand and the uncertainty of just this estimate. ...more on Wikipedia about "Measurement uncertainty"
The metric system is a system of units for measurement developed in late 18th century France to replace the disparate systems of measures then in use with a unified, natural and universal system. In the early metric system there were several fundamental or base units, the grad or grade for angles, the metre for length, the gram for weight and the litre for capacity. These were derived from each other via the properties of natural objects. Other units were derived from these fundamental units. ...more on Wikipedia about "Metric system"
Metrology is variously described as the science of measurement; the science of accuracy and precision; the history of measures; the history of measurement and other definitions. It is a field of study which has been highly politicized and nationalized with sharp even severe rhetoric as the field progressed. ...more on Wikipedia about "Metrology"
Observational error is the difference between a measured value of quantity and its true value. There are no perfect instruments in the real world. Every scientist knows this, but as long as he can manage the observational error, research can continue. ...more on Wikipedia about "Observational error"
The personal equation, in 19th- and early 20th-century science, referred to the idea that every individual observer had an inherent bias when it came to measurements and observations. ...more on Wikipedia about "Personal equation"
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