Elektrizitätszähler

摘要

In order to allow an electricity meter (1) to perform comprehensive self-monitoring of its measurement channels, it is proposed that the input signals, in particular the detected current and voltage signals (I1-I3 and U1-U3 respectively) should be detected in double via different signal channels (3a-3c) using sigma-delta modulators (15a-15c). A digital signal-processing unit (5) situated downstream conducts plausibility monitoring of the detected signals (I1-I3, U1-U3), an error signal being produced according to error type or signal deviation.