A simple 10:1 divider for precision measurement of 10 V by an 1 V standard

We developed an easy-to-operate 10:1 voltage divider system which enables to calibrate the Zener voltage standard's 10 V output within an uncertainty of a few parts in 10/sup 8/ with well established 1 V standard like 1 V Josephson array. Using a Zener voltage standard for a 10-V current source of the divider, the ratio calibration became simple and easy without losing any significant accuracy. The estimated uncertainty of 10:1 ratio calibration is about 0.006 ppm (1 U/sub c/).