The low current adapter is used to calibrate shunts at currents levels of 2 A or less. It connects together the current source and two shunts for calibration measurements. This adapter mates with N-type connectors to the shunts and a dual banana connection to the source. In this configuration, a certified or reference shunt is connected in series with a shunt that is being calibrated, which in turn are in series with a current source.