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MeggerHome Electrical Safety Electrical Theory Electrician Practice Exams 2005 NEC Search Term IndexMeggerThe megger is a portable instrument used to measure insulation resistance. The megger consists of a hand-driven DC generator and a direct reading ohm meter.
The moving element of the ohm meter consists of two coils, A and B, which are rigidly mounted to a pivoted central shaft and are free to rotate over a C-shaped core. These coils are connected by means of flexible leads. The moving element may point in any meter position when the generator is not in operation.
As current provided by the hand-driven generator flows through Coil B, the coil will tend to set itself at right angles to the field of the permanent magnet. With the test terminals open, giving an infinite resistance, no current flows in Coil A. Thereby, Coil B will govern the motion of the rotating element, causing it to move to the extreme counter-clockwise position, which is marked as infinite resistance.
HERE is a link to the official web site for Megger.For over 100 years, Megger has been the premier provider of electric test equipment and measuring instruments for electrical power applications. The trademark was first registered in May 1903 and is jealously guarded by the company. Although we're best known for our world famous range of insulation testers, Megger provides a full service solution to meet your electrical test and measurement needs. Our products provide testing solutions in the most critical maintenance areas including cable fault locating, protective relay testing, on-line monitoring of substation apparatus, and power quality testing. With such a diverse product offering, we are the single source for electrical test and measuring instruments.Megger's product offering spans 30 distinct product groups with over 1,000 specific products.Circuit breaker test sets, watthour meter test equipment and protective relay test instruments were formerly manufactured under the Multi-Amp brand. The company was first in the development of a completely automatic, software driven protective relay test system in 1984.High quality instruments used for testing and maintaining transformers, batteries and underground cables, were formerly manufactured under the Biddle brand. Among other innovations, we introduced the first commercial cable fault locator in 1950.Manufacturing insulation testers from 1kV to 10kV is where Megger started, and the Megger brand name is so well known today that maintenance professionals often incorrectly use it as a verb when they refer to doing an insulation test on wiring. This famous brand name dates back to 1889, when the first portable insulation tester was introduced with the MEGGER brand name on it. The firm enjoys an outstanding reputation in the areas of ground testing, oil testing and a wide variety of electrical contractor maintenance tools such as multimeters portable appliance testers and clamp-on meters.The most recent addition to Megger's range is an innovative range of instruments for testing telecommunications and data integrity. Working with both copper and optical technologies, and collaborating closely with the major industry players, the firm has developed easy to use products to keep the costs of test and measurement down and productivity up.In addition, Megger operates the renowned AVO Institute Training Institute, which offers top rated training for electrical maintenance and safety through the network of Megger offices, and STATES® Terminal Blocks and Test Switches, a name asked for by many major electric utilities. For over 65 years, test technicians and engineers have depended on States products to provide easy access to wiring on panel boards and switchboards, eliminate wiring reconnection errors and save operator time.Manufacturing and Marketing
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