Modeling the AC–DC Transfer Difference of Wideband Cage-Type Current Shunts

A cage-type, current-shunt construction design was adopted in this article as prospectively having a wide bandwidth. A lumped equivalent circuit model for current shunts assembled according to this design is described here. The ac-dc transfer differences of shunts with the nominal currents from 0.5 to 20 A are computed using standard two-port network theory. Cage-type current shunts were constructed and tested to validate the model. The measured ac-dc current transfer differences agree with the predicted values within the standard uncertainties in the whole frequency range of interest (10 Hz-100 kHz).