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Title: Compact, Transportable, Fully Automated Josephson Voltage Standard
Author: Stuart L. Kupferman
Source: 1997 Measurement Science Conference
Year Published: 1997
Abstract: A compact, portable Josephson calibration system for dc reference standards and digital voltmeters is described. It is three time lighter and seven times smaller (by volume) than laboratory systems. All of the system electronics are integrated into a single 13 cm high, rack-width box that is controlled by a laptop computer. Since the system is fully self checking and has no user adjustments, it is suitable for use by metrology technicians in secondary standards laboratories. Environmental sensors provide documentation of temperature, pressure, and humidity with all measurements. The system will replace travelling solid state voltage standards used within several NASA and DOE laboratories. The system has been shipped by overnight air express and then used to measure solid state voltage standards. The measurements have been compared with those made by conventional laboratory Josephson voltage standards and found to agree within a few nanovolts at 1 V.

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