| 摘要 |
A device for monitoring a variable voltage supply level is disclosed. The monitoring device functions to supply a signal which may be used to shut-down that equipment being supplied and/or drive an indicating device when the voltage level is below a trip voltage and, when the voltage level exceeds the trip voltage to provide a signal which may be used to reconnect the equipment circuit. The monitoring device includes a pair of low power generators each of which produce a digital signal. The digital signal of one generator varies more than the digital signal of the other generator with changes in applied voltage. The two digital signals are compared by a low power circuit and voltage level information is determined.
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