This paper describes the measurement system established for DC Voltage ranging from 10 mV to 1000 V at SAC ISRO Ahmedabad. This was done by characterising the Multifunction calibrator using three standards i.e. 10 V DC reference standard cell, Precision DC voltage divider and Reference multimeter for DC Voltage Measurement. For this, a 10 V DC reference standard cell was used as the reference voltage source, a Voltage divider was used in comparison mode and a reference multimeter was used to measure the output voltage produced by a voltage divider. The 10 V DC reference standard cell used in this measurement was traceable to the primary standard Josephson junction at National Physical Laboratory New Delhi. This measurement process was also done through automated mode. Expanded Measurement Uncertainty was calculated at coverage factor k = 2 and achieved measurement uncertainty is 3.14 ppm @ 10 mV and 2.34 ppm @ 1000 V.