A novel high-precision current adder based on dc comparator

To solve the problem of calibrating current summation measurement system, a novel high-precision current adder based on current comparator principle is presented. It contains primary windings of six channels, feedback winding and calibrating winding. The total 24 windings´ turns of such six channels can be selected skillfully according to the method of minimum common divisor, so that the sum of measured currents is indicated by the adder´s feedback current. And experiments show that its accuracy is better than 5×10^-5.