Representation of the DC Voltage unit
Josephson DC Voltage Standard as Primary Standard
The representation of DC voltage at BEV is based upon the Josephson effect. Calibrations of extremely high-stable electronic voltage standards and of voltmeters with the highest resolution can be achieved with the Josephson-Standard.
Electronic DC Voltage Standards used as Working Standards
A set of electronic working standards is calibrated as a result of the high-precision representation of the unit of direct voltage through the Josephson effect. These electronic voltage standards use a hermetically sealed and heated zener diode as an internal voltage reference. The electronic voltage standards generate an output voltage of 1.018 V and 10 V.
Voltage standards and voltmeters are calibrated against this set of working standards.
Higher DC voltages are split by a resistive divider into voltages between 1 V and 10 V and subsequently measured with a voltmeter connected to the Josephson standard.