The sampling of copper wire and resistance sampling in the circuit is good
So many people use Kang copper wire to do sampling, the temperature drift is small, the accuracy is controllable, and the cost performance is high.
At the same time, the sampling resistance of large current flows and the heating is very serious, so the temperature drift characteristics are also required. Ordinary high-power resistors to achieve large precision, high temperature drift is very small, the process requirements are very high, so even if you can do so, the price will be very high.
The position of the sampling resistance is generally placed on the power or ground, and the total current is flowing, and the power consumption is relatively large, so the power of the sampling resistance is also very large.
