US 12,461,127 B2
Non-contact DC current measurement device with open loop degaussing
Bryanna D. Raap, Everett, WA (US); Matt Moran, Everett, WA (US); Nicholas W. Dinsmore, Everett, WA (US); Joshua Zoellick, Mukilteo, WA (US); and Paul A. Ringsrud, Langley, WA (US)
Assigned to Fluke Corporation, Everett, WA (US)
Filed by Fluke Corporation, Everett, WA (US)
Filed on Apr. 14, 2023, as Appl. No. 18/301,079.
Prior Publication US 2024/0345137 A1, Oct. 17, 2024
Int. Cl. G01R 15/18 (2006.01); G01R 15/00 (2006.01); G01R 19/00 (2006.01)
CPC G01R 15/181 (2013.01) [G01R 15/005 (2013.01); G01R 19/0092 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A measurement device, comprising:
a magnetic core that is positionable to surround a conductor under test;
a magnetic field sensor positioned adjacent to the magnetic core;
a winding wrapped around at least a portion of the magnetic core; and
circuitry coupled to the winding and the magnetic field sensor, wherein the circuitry is configured to:
generate a fixed magnitude alternating current (AC) degaussing signal in the winding, the AC degaussing signal being independent of a current flowing through the conductor;
receive a magnetic field sensor signal from the magnetic field sensor representing a magnetic field induced in the magnetic core; and
determine a measurement of electric current flowing through the conductor based on the magnetic field sensor signal.