LYCOS RETRIEVER 
Electrical Resistance
built 814 days ago
Event Detectors are used for reliability testing of solder joints, electrical connectors, and electrical interconnects based on continuous, electrical resistance monitoring during accelerated aging or stress testing. New interconnect developments, such as lead-free-solder technology, require reliability qualification testing to avoid premature in-field-product-failures. Event Detectors perform continuous electrical monitoring for short-duration resistance variations on large numbers of channels. Event Detectors do not use channel scanning but instead perform continuous monitoring in compliance with IPC SM 785, IPC-9701, and JESD 22-B111 test standards. This type of testing is vital to interconnect-reliability testing in the telecommunications, computer, automotive, aerospace, and medical industries.
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Electrical resistance probes can be used in conductive systems, as well as non-conductive environments such as oil, gas, and atmosphere. The operating principle is based on the change in resistance of the probe element as it is exposed to corrosive conditions. Metal Samples manufactures electrical resistance probes for corrosion monitoring in wire loop, tube loop, flush-mount, and cylindrical element configurations. Wire and tube loop elements are Teflon or glass sealed. Cylindrical elements are supplied in all-welded form. Flush-mount elements can be provided with either glass or epoxy seals.
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Electrical resistance heating is one of the most common heating systems found in homes and apartments. It's ... one of the least efficient heating methods. Although electrical heaters convert 100% of their energy into heat, that electricity is usually produced by burning coal, oil, or natural gas. These fossil fuels only convert about 30% of their energy into electricity, and also produce harmful greenhouse gasses. If electric heat is to be used, a heat pump system is by far the most efficient.
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Since the Electrical resistance technique is not limited by the conductivity of the corrosive environment, it is applicable in almost any process. It is especially useful in soils, gases, vapors, hydrocarbons, thin moisture films and low conductivity waters. As such, it finds wide application in the following situations:
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ERT is a method that calculates the subsurface distribution of electrical resistivity from a large number of resistance measurements made from electrodes placed in the ground. For in situ applications, ERT uses electrodes on the ground surface or in boreholes. ERT may ... be utilized in a similar manner for imaging biomedical targets, rock or soil core, and block structures. The method has contributed to the fields of hydrogeology, soil science, oil reservoir management, engineering investigations, and glaciology. Developments at LLNL in instrumentation and data inversion algorithms have led to applications of 3-D imaging of time-dependent processes and, more recently, extension to incorporate induced polarization effects.
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The Electrical resistance technique measures metal loss continuously from a permanently installed probe. The metal loss is measured as the increase of electrical resistance of the probe sensing element as it cross-section is reduced by corrosive action. E/R instrumentation coverts the resistance increase into metal loss and corrosion rate readings.
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Electrical Resistance