UEBERWACHUNGSSYSTEM FUER VERKEHRSAMPELN.

摘要

Energy is supplied from an alternating voltage supply source(s) to a lamp (L1) via a controlled switch (SD1) and energisation of the unit is monitored by a voltage comparator (100) connected in cascade with a sensing latch (SL1). The voltage comparator (100) is such that its output is activated in response to its input voltage exceeding a predetermined magnitude of either polarity relative to a common reference voltage wave. A monitored voltage representative of the voltage present across the lamp (11) is supplied as input voltage to the comparator (100), the output of which is fed to the sensing latch set input. The latch is reset (RPS) at the commencement of each cycle of the alternating supply voltage.