NEW INTERNATIONAL REPRESENTATIONS OF THE VOLT AND OHM EFFECTIVE JANUARY 1, 1990

Starting on January 1, 1990, new representations of the volt and ohm based on the Josephson and quantum Hall effects, respectively, are to come into effect worldwide. Their implementation in the U.S. will result in increases in the values of the national representations of the volt and ohm maintained at the National Institute of Standards and Technology (NIST) of 9.264 parts per million (ppm) and 1.69 ppm, respectively. The resulting increases in the values of the U.S. representation of the ampere and U.S. electrical representation of the watt will be 7.57 ppm and 16.84 ppm, respectively. © 1990 IEEE