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.