Micropotentiometers as ac-dc transfer standards for low-voltage measurements

Micropotentiometers with commercial single-junction thermal converters and laboratory-made disk resistors are used at PTB as ac-dc voltage transfer standards at low voltages from 1 mV to 100 mV and frequencies from 10 Hz to 1 MHz. The measurement results and the estimated uncertainties are compared with those of other institutes at the international level.