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 ?
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.
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.
Each of the sections 1-2 and 17-18 of the manganin wire MM', with its associated milliammeter and adjustable current supply, is really a potentiometer operating according to Poggendorff's [1] little-used "second method.
1] does not flow through any part of the manganin wire MM'; (b) the flow of [I.
0001 volt is the limit of sensitivity of the apparatus; consequently no provision is shown in figure 2 for passing measured currents through the sections 1-2 and 17-18 of the manganin wire MM', for purposes previously explained.
The manganin wire MM' is divided into 35 dial sections of 0.
The copper-manganin junctions at the ends of the manganin wire MM' (fig.
0001 volt each to the right of tap point 18 on the manganin wire MM' (see fig.
Figure 5 shows semidiagrammatically the essential parts of the main dial and of the manganin wire in its bakelite enclosure.
The disconnection of these three dry cells definitely insures t a no current flows through the manganin wire MM' of the main dial.