Development of precision DC high voltage dividers

Precision DC voltage dividers with ratings up to 1000 kV have been built using the 150 kV resistor module developed at the National Measurement Institute, Australia (NMIA). The structure of the 150 kV resistor module and the measurement techniques for evaluating its performance are described. The method for evaluating voltage ratio errors at voltages up to 1000 kV is discussed. It is shown that a ratio error of less than 5 μV/V at 150 kV and less than 100 μV/V at 1000 kV can be achieved.