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US 4,559,497 AGranted
Ranged voltage monitor with out-of-range enunciators
OwnerAnthony Farrugiainventor
Life of this patent
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Abstract
A ranged precision voltage monitor with out-of-range enunciator characterized by a power supply and reference voltage stage, a voltage sensing stage, and an enunciator stage. The power supply stage provides power for the monitor, and further provides a reference voltage and a sensing voltage. The voltage sensing stage senses and displays voltage levels within a predetermined range, and further senses and displays over-range and under-range conditions. The enunciator produces a first audible tone for under-range conditions, and a second audible tone for over-range conditions.
Claims11
A ranged voltage monitor comprising:
- (a) under-range sensing means having a reference input, a sensing input, and an output, said under-range sensing means being operative to develop an under-range signal at said output when the voltage level at said sending input drops below a first predetermined level;
- (b) over-range sensing means having a reference input, a sensing input, and an output, said over-range sensing means being operative to develop an over-range signal at said output when the voltage level at said sensing input rises above a second predetermined level;
- (c) at least one mid-range sensing stage having a reference input and at least one sensing input, said at least one mid-range sensing stage being operative to develop at least one mid-range voltage level signal;
- (d) a plurality of visual indicators and means for connecting at least one of said indicators to each of said under-range sensing means, said over range sensing means, and said mid-range sensing stage;
- (e) a dual-level audible enunciator having inputs coupled to signals produced by the outputs of said under-range sensing means and said over-range sensing means;
- and
- (f) disabling means coupled to said indicators for disabling all but one indicator associated with the highest sensed voltage level.
4 more elements
Dependencies are inferred from the claim text.