Abstract
A highly accurate, guarded series-resistors-type voltage divider has been developed for measuring direct voltages of the range of 10 V to 1000 V. A divider consists of wirewound bobbin resistors which are installed in a temperature regulated oil bath and supplied with 1 mA constant current by the 1000 V of a calibrator. The voltage ratios are determined by a self-calibration technique using 10 V and 100 V reference voltages. Typical relative uncertainty is several parts per 107 for self-calibration of voltage ratio of 1000 V to 10 V. A comparison of the voltage ratio calibrations between this system and that of National Metrology Institute of Japan showed a reasonable agreement.
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