Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Using radiant energy
Patent
1980-06-23
1983-06-14
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Using radiant energy
324122, 324133, 34081503, G01R 1900
Patent
active
043885896
ABSTRACT:
A DC level indicator represents a sensed DC level by a color of emitted light. The indicator includes a plurality of lamps or LED's, each emitting a respective primary color, and a current-feeding circuit supplying current to each of the lamps or LED's when the sensed voltage level is in a respective predetermined subrange of the voltage range of the indicator. Preferably, the subranges overlap one another somewhat for at least some input levels and the indicator presents a complementary color for such levels. In one version, red, green, and blue lamps are driven by respective transistor switching circuits so that the voltage level is indicated by apparent spectral colors, from red, through orange, yellow, green, cyan, blue, and violet, to magenta as the voltage level sweeps from one end of the range to the other. In another version, an AC signal is mixed with the DC input level to form a mixed signal that is fed to a pair of LED's, one red and one green, in an anti-parallel, or back-to-back arrangement. Here, as the DC level sweeps through the range, the indicator's color changes from red, through orange and yellow, to green.
REFERENCES:
patent: 3191039 (1965-06-01), Gucwa
patent: 3873979 (1975-03-01), Craford et al.
patent: 3969672 (1976-07-01), Wallander et al.
patent: 4005365 (1977-01-01), Berger et al.
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