The Upgraded CERN DC-current Calibrator

An improved version of the CERN DC-current Calibrator (CDC) is presented. The CDC is a programmable, high precision, high resolution, +/- 10 A DC current source, initially developed for the calibration and testing of Direct-Current Current Transformers (DCCTs) used in the powering of superconducting magnets in the Large Hadron Collider at CERN. The upgrade addresses the stricter stability and low-frequency noise requirements for the testing of DCCTs for the new High-Luminosity Large Hadron Collider (HL-LHC) project.