AC-DC voltage transfer at UME

A new AC-DC voltage transfer system has been established at UME. The standards consist of a group of planar multijunction thermal converters (PMJTC), whose basic level (1 V to 3 V) is calibrated in PTB. A new software developed at UME is used for step-up and down procedures in order to establish voltages from 2 mV to 1000 V in the frequency range from 10 Hz to 1 MHz.