Development of a PJVS based primary AC power standard

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 phase alignment of the ac signals up to some nano radian.