Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1998-07-30
2000-04-04
Karlsen, Ernest
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324115, 324127, G01R 122, G01R 1508
Patent
active
060465824
ABSTRACT:
A self-powered electrical clamp meter measures AC voltages in the range of 6 volts to 600 volts and AC currents in the range of 1 ampere to 300 amperes, and receives operating power from the source of the voltage or current being measured. The clamp meter employs first and second rectifier circuits. One rectifier generates rectified AC power from an AC voltage signal supplied by a voltage probe, and the other rectifier generates rectified AC power from an AC current signal supplied by a current probe. First and second regulator circuits generate regulated DC power from the rectified AC power, and corresponding scaling circuits generate first and second scaled voltage signals whose respective amplitudes are proportional to the output of the corresponding rectifier. A switch selects the first scaled voltage signal when a voltage is being measured, and the second scaled voltage signal when a current is being measured. An A/D converter converts the selected scaled voltage signal into a corresponding coded digital value that is displayed on a display along with an indication of whether the displayed value represents a voltage measurement or a current measurement. The switch, A/D converter, and display are low-power devices supplied with DC power from either the first or second regulator.
REFERENCES:
patent: 2724821 (1955-11-01), Schweitzer, Jr.
patent: 2905899 (1959-09-01), Miller et al.
patent: 3914689 (1975-10-01), Wright
patent: 4074193 (1978-02-01), Kohler
patent: 4132981 (1979-01-01), White
patent: 4422039 (1983-12-01), Davis
patent: 4438396 (1984-03-01), Harnden, Jr. et al.
patent: 4831327 (1989-05-01), Chenier et al.
patent: 4855671 (1989-08-01), Fernandes
patent: 5157708 (1992-10-01), Garthwaite et al.
patent: 5193108 (1993-03-01), Stocklin
patent: 5373412 (1994-12-01), Dousse
patent: 5446372 (1995-08-01), Berkcan
patent: 5541503 (1996-07-01), Berkcan et al.
patent: 5598315 (1997-01-01), Phillips
Harris Semiconductor, ICL7126 31/2-Digit Low-Power Single-Chip A/D Converter, pp. 2-55-2-65, prior to Jul. 30, 1998.
Mohammed Kismet
Sanelli Ron
Karlsen Ernest
United Dominion Industries, Inc.
LandOfFree
Self-powered digital clamp meter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Self-powered digital clamp meter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Self-powered digital clamp meter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-368838