High-Voltage Divider Calibration with the Reference Step Method

High voltage DC measurements, from 10 kV up to several hundred kV, are usually traceable through resistive dividers which have a divider ratio on the order of 10 000 to 100 000. The reference step method providers a highly accurate ratio metric method of calibrating 1000 V calibrators across a wide range of voltages. We adapt this method for measuring the ratio of high voltage dividers at low (equal or less than 1000 V) voltages as a first step to establishing traceability at high voltages.