A voltage divider standard

A voltage divider standard (VDS) is described, which combines high accuracy and stability with built-in calibration convenience features. Compensation is provided for bridge unbalance due to connection resistances. Adjustable zero offset permits the measurement of differences on the divider slidewire to the closest 0.1 ppm (parts per million) by the null balance method. A basic method of calibration, which eliminates external standards of comparison, provides an accuracy which is limited only by the errors involved in making the measurements.