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This paper describes a method to extend the frequency range of Programmable Josephson Voltage Standard based ac voltage calibrations. It requires coherent (synchronous) signal generation and sampling to a common reference time-base of a digitizer and accurate phase alignment of ac signals. Practical and physical limitations of the underlying principle are covered in the text. Experimental investigations...
This paper describes the development of a primary single-phase sampling ac power standard, which uses a programmable Josephson voltage standard (PJVS) in its core. Magnetic transducers are used to scale down to low levels the ac signals to be compared with the PJVS by digital sampling. Independent digital adaptive regulators in form of algorithms in a control software guarantee stable and accurate...
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