The principle of current sampling of manganese copper wire.
Manganese copper wire is equivalent to a low value resistor, used for current sampling, is based on Ohm's theorem, resistors fixed, the voltage is proportional to the current.
Manganin resistance wire is commonly used in measuring the current sampling resistance, manganese copper is equivalent to a low value resistor, the voltage and current is proportional to the temperature drift is characterized by a very small amount. After the test, by about 2A current in Concord manganin resistance wire 1 ohms, due to the heat generated by heating, will only cause the resistance change of 0.02 ohm, plays a very important role in current stability. On the other hand, Concord manganin resistor silk 1 ohms is about 1m long, due to contact with the outside world area, even by a large current can quickly heat, further reduce the influence of temperature drift caused by.
The characteristic of manganese copper wire as current sampler is that the coefficient of temperature drift is small.
