Researchers from the Laboratoire National d’Essais (LNE) have developed a quantum current standard able to generate currents of values in a range from microamperes (10-6 A) to milliamperes (10-3 A) accurately linked to the elementary charge with a targeted relative uncertainty of 10 parts in a billion. This breakthrough relies on an error-free application of… Read More

A new accuracy record in measurements on single-electron pumps has been demonstrated by PTB. 0.16 µA/A of relative combined uncertainty was reached within less than 1 day of measurement time. Robustness tests of pump operation on the sub-ppm level revealed good stability of tunable-barrier pumps against variations in the operating parameters. Single-electron (SE) pumps are promising… Read More

The Conference on Precision Electromagnetic Measurements is the most important conference in the field of electrical metrology. Held every two years, it brings together representatives from National Measurement Institutes, Universities and Industry to discuss state of the art measurement techniques and issues surrounding the measurement system. The conference in 2016 was held in Ottowa, Canada.  A significant… Read More

At a microscopic level, electrical current is most often described as a flow of charged particles. While the size of an electrical current can therefore be quantified using a ‘particle flow rate’, this is not the way that the base unit of electrical current in the International System of units (SI) the ampere is presently defined. Instead,… Read More