Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural ranges – scales or registration rates
Patent
1995-01-27
1997-02-25
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural ranges, scales or registration rates
324123R, G01R 1508, G01R 130
Patent
active
056062494
ABSTRACT:
Electric apparatus responsive to currents and/or voltages having wide dynamic ranges incorporates ranging circuits for each input in which a multiplexer providing the ranging selection has a common input connected to the output of an operational amplifier providing the selective gain and has a plurality of outputs connecting selected ones of a plurality of series connected precision resistors in a feedback loop around the operational amplifier. A second operational amplifier is connected as a follower to the last output of the multiplexer so that the gain applied to the output signal is not distorted by the resistance of the switches in the multiplexer. For three-phase systems not having a neutral conductor, phase to neutral voltages with ranging are generated by subtracting a neutral-to-ground voltage produced from an artificial ground created by connecting three resistors in a wye across the phase conductors from the phase-to-ground voltages applied to the ranging circuit input.
REFERENCES:
patent: 3159787 (1964-12-01), Sexton
patent: 3187323 (1965-06-01), Flood et al.
patent: 3652934 (1972-03-01), Paljug
patent: 4068185 (1978-01-01), Christen et al.
patent: 4541065 (1985-09-01), Faulkner et al.
patent: 4933631 (1990-06-01), Eccleston
patent: 5270898 (1993-12-01), Elms et al.
patent: 5332963 (1994-07-01), Hightower et al.
3030/3060 Power Profiler User's Guide, Basic Measuring Instruments (BMI); P/N 89001985; Rev. Jul. 1989; Cover Page and pp. 11.1 and 11.7.
Eaton Corporation
Karlsen Ernest F.
Moran Martin J.
LandOfFree
Electrical apparatus with wide dynamic range for monitoring and does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrical apparatus with wide dynamic range for monitoring and , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrical apparatus with wide dynamic range for monitoring and will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1976431