Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1989-07-26
1990-04-03
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324117R, 324117H, G01R 122, G01R 3300
Patent
active
049143832
ABSTRACT:
A non-contact ammeter for measuring direct current in a conductor has a core capable of carrying a magnetic flux. The core surrounds the conductor so that the latter serves as a primary winding for the core. A second winding on the core is inductively coupled to the conductor. A current indicator is connected to the second winding. A control establishes the voltage on the second winding and flux changes in the core to avoid or limit saturation of the core. The control may be responsive to the flux condition of the core.
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