Manganin


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Related to Manganin: Nichrome, constantan

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

References in periodicals archive ?
4 of electromagnetic testing of the Research & Design Institute <<Molniya>> of the NTU <<KhPI>> demonstrates that, taking into account the state of the high-voltage impulse technique of the actual task of metrological support of tests on [1, 2, 5] of domestic aviation and rocket and space technology, as well as electric power facilities for lightning in this shunt construction improvement must be subject to: first, a thin measuring manganin disk; secondly, the insulation between the massive internal brass and massive outer brass cylindrical electrodes.
Other than the large Seebeck coefficient, it has very similar characteristics to manganin, and Thomas noted that sometimes Constantan is used for high value standard resistors, especially for AC applications.
Similar to manganin, this material's temperature coefficient of resistance has a parabolic shape with its maximum around room temperature, but the curve to several tens of degrees either side of the peak has only about 10% of the slope for manganin.
For Thomas' new design, coils were wound on insulated brass bobbins, brass having nearly the same coefficient of expansion as manganin.
The 1939 design had a bifilar-wound coil of insulated manganin wire.
Thomas, Stability of Double-walled Manganin Resistors, Journal of Research National Bureau of Standards, 36, 1946, pp.
Our Manganin foil offering is a unique and great first product for our companies to work together on, as it offers the best combination of low ohmic values, tight tolerances and lowest TCR of any TO package offered in the market today.
For more than 45 years, Riedon has been at the cutting edge of resistive solutions as evidenced today in its ability to offer customers one of the most diverse and complete resistive product lines available, including wire wound, thick and thin film, and Nichrome and Manganin foil resistive products, which are used in industries as diverse as communication, power management, medical device, and test/instrumentation equipment.
Legal Ohm was maintained at 1 [OMEGA] by selected groups of manganin resistance standards (18).
This current enters the manganin wire at the tap point 8 and leaves it by the slider S.
If steps of 100 [micro]v were sufficiently small, or if interpolation between steps were admissible, the sections 1-2 and 17-18 of the manganin wire would be superfluous.
3], except that the two currents flow in opposite directions through the manganin wire.