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Manganin

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Manganin 

a copper-based alloy with additives of manganese (11.5-13.5 percent) and nickel (2.5-3.5 percent), characterized by an extremely small change in resistivity within the range of ordinary temperatures. It was first introduced in Germany in 1889. Manganin has the following characteristics: specific resistance, 0.47 microhm .m at 20°C; temperature coefficient of electric resistance, 2 × 10-6 1/°C at 15°-35°C (after special heat treatment—stabilizing annealing); melting point, 960°C.

Manganin is used in the manufacture of standard resistors and elements for measuring instruments. The chief advantage in using Manganin rather than Constantan is that Manganin has a very low thermoelectromotive force when coupled with copper (not more than 1 microvolt/°C); therefore, only Manganin is used for high-precision instruments. In addition, Manganin, unlike Constantan, is not corrosion-resistant in atmospheres containing acid and ammonia vapors; it is also sensitive to substantial changes in atmospheric humidity. Certain silverbased alloys with additives of manganese (up to 17 percent), tin (up to 7 percent), and other elements are classified as silver Manganins.

L. L. ZHUKOV
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Heat-treated manganin wire resistors developed by Thomas incorporated hermetically-sealed, double-walled enclosures, with the resistance element in thermal contact with the inner wall of the container to improve heat dissipation.
The ampere and electrical standards by Williams, Edwin R. / Journal of Research of the National Institute of Standards and Technology
The 15 and 30-watt Manganin foil resistors stocked by Digi-Key have a one percent tolerance, are available in TO-220, SMD TO-220 and TO-218 packages and range in value from 0.
Digi-Key and Riedon Sign Global Distribution Agreement by Business Wire
1] and a key K to the fall of potential in a continuous loop of manganin wire.
Treasure of the Past: IV by Journal of Research of the National Institute of Standards and Technology
 
 
 
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