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The paper describes a new primary standard of power at mains and audio frequencies developed at the National Measurement Institute Australia. The standard is based on precision transformers and a thermal power comparator. It provides fully automated power measurements with 1-s uncertainties close to 2 µW/VA.
The paper describes a computer-controlled multi-range current transformer with input current ranges from 0.125 A to 20 A and an output voltage of 1 V suitable for use in electrical power standards of the highest precision.
We have developed a Programmable Josephson Voltage Standard (PJVS) that can produce voltages up to 20 V with a resolution of better than 0.1 µV and that does not require liquid helium. The system has two superconductor - normal metal - superconductor junction arrays connected in series and driven by two radiofrequency oscillators. The new system agrees with the primary Josephson voltage standard maintained...
A system designed for precision measurement of ac-dc difference of thermal voltage converters in terms of a programmable Josephson voltage standard is under development at the National Measurement Institute, Australia, in collaboration with the National Institute of Advanced Industrial Science and Technology, Japan. The agreement between the new system and calculable thermal converters is presently...
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