• Calibration - GIS Wiki | The GIS Encyclopedia

    This is called a limited calibration. But if the final measurement requires 10% accuracy, then the 3% gage never can be better than 3.3:1. Then perhaps adjusting the calibration tolerance for the gage would be a better solution. If the calibration is performed at 100 units, the 1% standard would actually be anywhere between 99 and 101 units.

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  • HIGH-PRECISION MEASUREMENT AND CALIBRATION TECHNOLOGY AS A

    E.ON Ruhrgas makes a major contribution to ensuring precise gas quality measurement in Germany. As a state-approved test centre, the E.ON Ruhrgas Gas Quality Centre certifies approx. 400 calibration gases annually. They serve as working standards for the calibration and verification of gas quality measurement instruments.

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  • Calibrating Survey Instruments | GIM International

    Jul 07, 2007 · The de facto standard for zero and cyclic error calibration closely resembles the ISO 17123–4 standard. The laser-tracker distance meter calibration procedure is outlined in the American standard ASME B89.4.19 (2006), the German standard VDI 2617 Part 10, and currently under the ISO 10360 standard.

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  • GIS CALIBRATION PROCEDURES

    investigate the GIS calibration, as questions had been raised regarding its pointing, a clear degradation in the performance of the GIS 1 detector, and the quality of the latest calibration of 2003, which was based on the known characteristics of Microchannel Plate (MCP) aging and observed line widths and intensities in the major spectral lines.

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  • Design and testing of a novel calibration system for UHF

    with other known calibration systems. In addition it will reduce the cost of calibration. 1 INTRODUCTION The measurement of partial discharge activity in gas-insulated substations (GIS) is well known and is increasingly used for condition monitoring purposes. A modern way of measuring partial

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  • (PDF) Measurement-Based GIS Revisited - ResearchGate

    The measurement-based GIS, introduced by (Buyong et al., 1991) and extended by (Goodchild, 2002), , store quality information (specifically accuracy and precision) down to the level of individual

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  • More About GIS Error, Accuracy, and Precision | GEOG 469

    The Importance of Error, Accuracy, and PrecisionSome Basic DefinitionsTypes of ErrorSources of Inaccuracy and ImprecisionThe Problems of Propagation and CascadingBeware of False Precision and False Accuracy!The Dangers of Undocumented DataUntil quite recently, people involved in developing and using GIS paid little attention to the problems caused by error, inaccuracy, and imprecision in spatial datasets. Certainly, there was an awareness that all data suffers from inaccuracy and imprecision, but the effects on GIS problems and solutions was not considered in great detail. Major introductions to the field such as C. Dana TomlinGeographic Information Systems and Cartographic Modeling (1990), Jeffrey Star and John EstesGeographic Information Systems: An Introduction (1990), and Keith ClarkeAnalytical and Computer Cartography(1990) barely mention the issue. This situation has changed substantially in recent years. It is now generally recognized that error, inaccuracy, and imprecision can "make or break" many types of GIS projects. That is, errors left unchecked can make the results of a GIS analysis almost worthless. The irony is that the problem of error is it devolves from one of the greatest strengths of GIS...

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  • Accuracy and precision - GIS Wiki | The GIS Encyclopedia

    Accuracy Versus Precision; The Target AnalogyQuantifying Accuracy and PrecisionAccuracy and Precision in Binary ClassificationAccuracy and Precision in Psychometrics and PsychophysicsAccuracy and Precision in Information SystemsSee AlsoReferencesExternal LinksAccuracy is the degree of veracity while precision is the degree of reproducibility.[citation needed]The analogy used here to explain the difference between accuracy and precision is the target comparison. In this analogy, repeated measurements are compared to arrows that are shot at a target. Accuracy describes the closeness of arrows to the bullseye at the target center. Arrows that strike closer to the bullseye are considered more accurate. The closer a systemmeasurements to the accepted value, the more accurate the system is considered to be. To continue the analogy, if a large number of arrows are shot, precision would be the size of the arrow cluster. (When only one arrow is shot, precision is the size of the cluster one wouldexpect if this were repeated many times under the same conditions.) When all arrows are grouped tightly together, the cluster is considered precise since they all struck close to the same spot, if not necessarily near the bullseye. The measurements are...

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  • Introduction to Measurement and Calibration | ASQ

    Anyone responsible for measurement quality and accuracy. You will learn skills including standardization, managing a metrology system, and units and instrumentation of measurements. This course is intended for anyone using or calibrating measurement instruments, calibration coordinators, or for those responsible for maintaining quality.

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  • Scale of measurement - GIS Wiki | The GIS Encyclopedia

    Sep 10, 2018 · Stevens' Scales of Measurement or level of measurement is a system for classifying attribute data into four categories, developed by psychologist Stanley Smith Stevens and first published in 1946. [1] [2] Stevens called his four scales nominal , ordinal , interval , and ratio , so the system is often called "NOIR."

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  • GMP Measuring Instrument Calibration - what you need to know

    Sep 12, 2017 · Measuring instrument calibration helps pharmaceutical companies with Quality Assurance and cGMP compliance, in 3 main ways: 1. Traceability – Measurement results from a certain instrument need to be consistent with similar measurements taken from others, regardless of differences in the location, operators or even the instrument itself. This allows for greater control at any stage of the manufacturing, testing or validation process.

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  • Physikalisch-Technische Bundesanstalt

    As Germanynational metrology institute, PTB is Germanyhighest authority when it comes to correct and reliable measurements. It is the supreme technical authority of the Federal Ministry for Economic Affairs and Energy (BMWi) and employs a total of approx. 1900 staff members.

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  • Calibration Germany | Europages

    Germany: Browse through 157 potential providers in the calibration industry on Europages, a worldwide B2B sourcing platform.

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  • Accuracy of Spatial Data Used In Geographic Information Systems

    factors affect distance measurements,angle measurements,and GPS satellite observations, among others. Instrumental effects include lack of proper calibration and adjustment of the instru­ ment as well as imperfections in the construction of the instru­ ment, e.g., nonuniform graduations of the linear and circular scales.

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  • Calibration - Wikipedia

    In measurement technology and metrology, calibration is the comparison of measurement values delivered by a device under test with those of a calibration standard of known accuracy. Such a standard could be another measurement device of known accuracy, a device generating the quantity to be measured such as a voltage, a sound tone, or a physical artifact, such as a meter ruler. The outcome of the comparison can result in one of the following: no significant error being noted on the device under

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  • GIS Data: A Look at Accuracy, Precision, and Types of Errors

    Nov 06, 2011 · Related Articles about GIS Data Quality. Spatial Data Quality: An Introduction; About the Author. Manuel S Pascual (born in Sevilla, Spain) has a Master’s degree in Geography from the University of Seville with majors in Cartography and Photogrammetry. Pascual did his post graduate work at UNM with an emphasis in GIS and Remote Sensing.

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  • GIS, REMOTE SENSING AND FIELD MEASUREMENTS FOR ESTIMATING

    The empirical formulas of the form b Q=a(W L )have been developed for Visdalia and Godsamba. The depth-discharge empirical formulas developed for discharge site Godsamba. 2.62 Q g=13.25(W L )and Q. v=1 2.77 (W. Visdalia site have been validated for showed good fit.

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  • Calibration of Total Stations Instruments at the ESRF

    Key words: total station, EDM calibration, angle calibration, laser tracker, ADM calibration, standards, certification, ISO 9000 SUMMARY The European Synchrotron Radiation Facility (ESRF) is an accelerator laboratory located in Grenoble, France which produces high quality X-rays for use by scientists from Europe and around the world.

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  • The Calibration of Measurement Systems | Quality Digest

    Consistency ChartsMultiple Weighings of NB10PrecisionBiasAdjusting The Measurement ProcessRubber RulersSummaryA consistency chart provides an operational definition of a measurement system. According to W. Edwards Deming, an operational definition consists of three parts: 1. A criterion to be satisfied 2. A test procedure for determining conformance to the criterion 3.A decision rule for interpreting the results of the test procedure When you have only the first part all you have is the basis for an argument. It is only when you have all three parts that you have progressed from wishful thinking to an operational definition. As we saw in last month’s column, a process behavior chart provides an operational definition of how to get the most out of any process. And it can be used to determine when a measurement system is operating consistently. 1.A measurement procedure is consistent if and only if repeated measurements of the same item result in a sequence of values that are homogeneous (consistently similar). 2.To determine whether or not a sequence of values is homogenous we shall place th...

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  • Spatial Data Quality: An Introduction - GIS Lounge

    Jan 11, 2008 · Data quality is a pillar in any GIS implementation and application as reliable data are indispensable to allow the user obtaining meaningful results. Spatial Data quality can be categorized into Data completeness, Data Precision, Data accuracy and Data Consistency. Data Completeness: It is basically the measure of totality of features.

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  • Calibration and Maintenance of Measuring Equipment | SGS Finland

    Incorrect measurements compromise not only your reputation, but also safety and quality. The calibration of measuring and control equipment by an accredited supplier means that measurements are verified and traceable, thereby fulfilling quality system requirements as given, for example, in the ISO 9000 standards.

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  • Measurement - GIS Wiki | The GIS Encyclopedia

    HistoryStandardsUnits and SystemsSome Special NamesDifficultiesDefinitions and Theoriesin PhysicsReferencesExternal LinksThe word "measurement" is derived from the Greek word "metron"which means a limited proportion. The history of measurements is a topic within the history of science and technology.

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  • Calibration of UHF Partial Discharge Measurement for Power

    measurement of electromagnetic waves radiated by PD. First, UHF measurements were used for gas insulated switchgears (GIS) [3]. When applied on transformers, the UHF method requires antennas inside the tank. Hence, the Cigré Working Group WG A2-27 recommends DN50 valves or dielectric windows for the fitting of UHF probes in brochure 343 [4]. The

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  • GIS Ag Maps - About Post-Calibrating Yield Maps

    About Yield Monitor Calibration and Yield Map Post-Calibration . It is challenging to keep a yield monitor properly calibrated throughout the harvest season, but itimportant to have yield maps with accurate quantities if you base variable rate application on yield map values.

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  • Obsolete German units of measurement - Wikipedia

    The obsolete units of measurement of German-speaking countries consist of a variety of units, with varying local standard definitions. Some of these units are still used in everyday speech and even in stores and on street markets as shorthand for similar amounts in the metric system. For example, some customers ask for one pound of something when they want 500 grams. The metric system became compulsory on 1 January 1872, in Germany and on 1 January 1876, in Austria. Some obsolete German units ha

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  • Service and Calibration Center - Global GIS

    This wealth of skills and knowledge allow us to undertake basic calibrations and repairs on all manner of manufacturer’s equipment. Our promise to you is that we will not undertake any work that we are not competent or authorized to undertake. Finally all service done by technicians are supervised by GLOBAL GIS Technical Manager ( B.Sc Surveyor).

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  • Calibration of GPS receivers based on IGS and CORS techniques

    economy. The precise calibration of GPS receivers is fundamentally important for the precise and reliable posi-tioning. Highly accurate calibration is crucial for consis-tency in length, and to ensure the quality of the GPS network in keeping with the rigorous and efficient national measurement standard.

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  • The importance of Calibration of Measuring - Latest Quality

    Accurate measurement enhances the quality of decision whereas poor quality measurements result in poor quality decisions. Uncertainty is the estimated numerical value which helps in minimizing risk and possible poor consequences. Calibration defines a particular numerical value for uncertainty and enhances the quality of decisions.

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  • QNix® Coating Thickness Gauges - Made in Germany Quality and

    The wide range of our QNix® dry film thickness gauges allows the non-destructive measurement of coatings in different sectors. We have decades of experience in heavy-duty corrosion protection , industrial painting and contract coating , surface finishing with galvanised and anodic coatings as well as vehicle assessment and bodywork .

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