Why choose constantan, manganin and other materials for manganin resistors

Why choose constantan, manganin and other materials for manganin resistors

                       
Update:2022-09-02
Summary:In the selection of manganese copper resistors, different materials mean different resistances, and ...
In the selection of manganese copper resistors, different materials mean different resistances, and what are the advantages of their materials? The selection of commonly used materials are silver, copper, aluminum, manganin, constantan, etc., but the manganin resistance wire selection on the market is mostly based on constantan wire, manganin resistance manganin wire. What are the advantages of their materials? In the selection of resistance materials, different materials mean different resistances. Commonly used materials are silver, copper, aluminum, manganese copper, constantan, etc., but the most commonly used resistance wire materials on the market are constantan. Mainly wire, manganese copper wire.
It is used to make standard resistors, bridges, potentiometers, and other precision electrical measuring instruments with a working temperature below 100 ℃. Constantan: BMn40-1.5 manganese white copper, also known as constantan. High thermal electromotive force, low-temperature coefficient of resistance and stable resistance; corrosion resistance, heat resistance; high mechanical properties and can well and withstand pressure processing. When constantan is paired with Cu, Fe, and Ag, it has high thermoelectric potential. It is used for temperature measurement in the temperature range of -100℃~+300℃; it is also used to make sliding varistors, and the working temperature is below 500℃.
It can be seen from the above table that the resistivity of pure metal manganese copper is very small, and the resistivity of the alloy is relatively large. We know that all kinds of wires are made of metals with low resistivity such as copper and aluminum. The resistance of various materials The rate varies with temperature, and the resistivity of metals increases with increasing temperature. Using the characteristic that the resistivity of metal increases with the increase of temperature, the resistance thermometer is made. The commonly used thermometer is made of metal platinum. Put the thermometer on the object to be measured, as long as the resistance of the platinum wire is measured, you can Know the temperature of the object. Some alloys, such as constantan and manganin, have resistivity almost unaffected by temperature changes and are often used to make standard resistors. Or the resistance wire made of manganese copper wire is more secure.

125-450Micro Ohms Shunt For Energy Meter  Straight manganese copper shunt

125-450Micro Ohms Shunt For Energy Meter Straight manganese copper shunt

  • High Accuarcy, Resistance Tolerance <±3%
  • T2 Copper, 6J13 / 6J12  Manganin
  • Temperature Coefficient as low as 40/20 ppm/k
  • Power Loss Less than 50mw
  • NO Visible Welds, Smooth  Surface
  • Pure manganin copper shunt for electrical meter