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About Resistance Standards and Decades
Resistance standards and decades provide highly accurate, standard values of resistance for testing, comparing, and calibrating electrical and electronic components and products. Measured in ohms (W), resistance is the degree to which a body opposes the passage of electrical current. Resistance standards usually consist of a single, fixed-value component or several components (e.g., several fixed-value resistors) that are not in the same circuit. Resistance standards with multiple components often have multiple posts or a rotary switch for selecting different resistance values. Decades, decade boxes, or decade substituters are digitally variable and usually consist of multiple components in a single circuit. The standard resistance value is selected by varying the number of resistors in the series or parallel circuit. RTD simulators provide resistance values for the calibration and testing of resistance temperature detectors (RTD) at specified temperatures. Resistance standards and decades that include rheostats or potentiometers are also available.
There are several grades of resistance standards and decades. Devices that can be traced to the National Institute of Technology Standards (NIST) are compared to a master standard that has been checked against a NIST standard. Transfer, primary or laboratory grade resistance standards and decades are used to compare or transfer the accuracies from NIST standards to working standards, sources, simulators and calibrators. Working standards are robust or rugged units for production or in-line testing and calibration. Reference or working resistance standards are compared or verified by transfer or laboratory standards and then used for calibration, testing and inspection of production resistors as well as other components, meters and instruments.
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Engineering Web: Resistance Standards and Decades
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resistance standards and resistance measurement Decade Resistance Boxes Resistance Standards and Resistance Measurement Resistance Standards and Resistance Measurement See Seaward Group USA Profile & Catalog |
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NIST/University of Colorado Scientists Create New Form of... For many decades, physicists have proposed that superconductivity (which involves fermions) and Bose-Einstein condensates (BEC) are closely linked. See NIST (National Institute of Standards & Technology) Information |
