Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural ranges – scales or registration rates
Patent
1994-09-13
1996-11-05
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural ranges, scales or registration rates
324133, G01R 1508
Patent
active
055721176
ABSTRACT:
A multi-meter comprising a switch for selecting an object and a range of a thing to be measured, a display unit for displaying a value measured according to the object and the range selected by the switch, a measurement circuit including a Z-state measurement unit to measure a Z-state of the thing to be measured, in addition to the object to be measured, the Z-state being an unknown state, and a controller for controlling the switch, the display unit and the measurement circuit. The Z-state measurement unit includes a light emitting circuit having first and second light emitting diodes. The first light emitting diode is turned on when the thing to be measured is not at the Z-state and the second light emitting diode is turned on when the thing to be measured is at the Z-state.
REFERENCES:
patent: 3390329 (1968-06-01), Gewirtz
patent: 3961256 (1976-06-01), Gaskell et al.
patent: 4020414 (1977-04-01), Paredes
patent: 4028616 (1977-07-01), Stevens
patent: 4092591 (1978-05-01), Lozowksi
patent: 4296375 (1981-10-01), Takezaki
patent: 4321543 (1982-03-01), Tuska
patent: 4743842 (1988-05-01), Langone et al.
Goldstar Electron Co. Ltd.
Karlsen Ernest F.
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