Current sensing with a precision of a few parts per million within a fraction of a second

Abstract

The most precise measuring of electrical current is achieved by the Current Sensing Resistor method. The precision and speed of response to changing current depend on thermal stability of the resistor — its low Temperature Coefficient of Resistance and a related to it Power Coefficient of Resistance. The new Foil resistor technology (Z foil) reduced the TCR to below 1 ppm/°C and special construction reduced the thermal distortion leading to a current detector with a Precision of a few parts per million within a Fraction of a Second.