Apparatus for diagnosing electric power source while power is supplied to load device from the power source

摘要

A power source monitoring apparatus for monitoring a state of a subject power source which consists of at least one of a plurality of electric power sources in an electric system wherein a load device having at least one electrically operated load is electrically connected to the power sources, the monitoring device apparatus a detecting portion which detects a voltage and/or a current of at least one of the load device and the plurality of electric power sources, and a diagnosing device which diagnoses the subject power source for an abnormality on the basis of an output of the detecting portion, while the electric system is placed in a power supply state wherein an electric power is permitted to be supplied from only the subject power source to the load device.