A New Method for Measuring the Level Dependence of AC Shunts

We report on a new method for the measurement of the level dependence of the ac–dc difference of current shunts. The method is based on the use of a binary inductive current divider. A method to compare two ac shunts at common ground is described. Measurement results on two 1-A ac shunts, which consist of different numbers of resistors, indicate that the level dependence between 0.5 and 1 A is less than 2 $\mu\hbox{A/A}$ with an uncertainty of less than 7 $\mu \hbox{A/A}$ from 1 to 100 kHz.