Design of Low Impedance Standard Defined In a Four-Terminal-Pair Configuration

Abstract

Electrical low resistive impedance are widely used as resistance standards in metrology laboratories. The aim is to measure a high level of alternative and direct currents (AC and DC) with high accuracy, or to use it as resistive loads suitable for calibrating instruments (such as impedance meters). The use of a low resistive impedance as a standard requires knowledge of its magnitude deviation from DC and its phase angle as a function of frequency. In this paper, we present a design of a low impedance (current shunt) for current measurements at 2 A up to 5 kHz. The structure of the current shunt is defined in a four terminal-pair (with BNC connectors). The relative deviation from DC is less than 0.23 % in magnitude for a current of 2 A up to 5 kHz.