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The most common method to measure direct current high voltage (HV) down tothe ppm-level is to use resistive high-voltage dividers. Such devices scale theHV into a range where it can be compared with precision digital voltmeters toreference voltages sources, which can be traced back to Josephson voltagestandards. So far the calibration of the scale factors of HV dividers forvoltages above 1~kV could only be done at metrology institutes and sometimesinvolves round-robin tests among several institutions to get reliable results.Here we present a novel absolute calibration method based on the measurement ofa differential scale factor, which can be performed with commercial equipmentand outside metrology institutes. We demonstrate that reproducible measurementsup to 35~kV can be performed with relative uncertainties below $1\cdot10^{-6}$.This method is not restricted to metrology institutes and offers thepossibility to determine the linearity of high-voltage dividers for a widerange of applications.

A novel ppm-precise absolute calibration method for precision high-voltage dividers