Abstract
Prototype distributed digitizers have been developed with the metrological precision of the individual measurement nodes. A master controller aggregates the data of the nodes and performs all computational tasks. A crucial part of the system is the synchronization of the individual nodes at the nanosecond level using white-rabbit technology. Fiber-optic communication is used to reduce interference and to obtain high isolation. When operated on battery power, this allows for special applications such as the measurement of currents in high-voltage lines. First, results show that a phase difference between nodes of a few microradians can be achieved with a resolution of better than $0.1~\mu $ rad.
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