US 2004/0201373 A1Published application

Current probe

AssigneeTektronix, Inc.

InventorKatsuhisa Kato

Life of this patent

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Abstract

A current probe suitable for detecting a large current from DC to high frequency has first and second current detecting means. The first current detecting means detects a current under test from DC to a predetermined intermediate frequency band. It has an orthogonal flux gate element, an induced voltage detecting circuit 46 for detecting an induced voltage of the orthogonal fluxgate element, and a feedback coil 50 receiving the output voltage of the induced voltage detecting circuit 46 for generating magnetic flux to cancel the magnetic flux generated by the current under test. The second current detecting means has a Rogowski coil 12 and an integration circuit and detects said current under test higher than the predetermined intermediate frequency band.

Claims5

Dependent claims

A current probe for detecting a value of a current flowing in a signal line under test, comprising:

a first current detecting means in the form of an orthogonal fluxgate element for detecting said current in the signal line under test from DC to a predetermined intermediate frequency band, an induced voltage detecting means for detecting an induced voltage of said orthogonal fluxgate element, and a feedback coil receiving the output voltage of said induced voltage detecting means for generating a magnetic flux for cancelling the magnetic flux generated in said induced voltage detecting means by said current in the signal line under test, and
a second current detecting means having a Rogowski coil and an integration circuit for detecting said current in the signal line under test higher than said predetermined intermediate frequency band.

Dependencies are inferred from the claim text.

Facts

Application: 10/786,485Filed 25 Feb 2004
Priority: JP 2003-05011126 Feb 2003
Published: 14 Oct 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

G01R 15/185
Using transformers with a magnetic core: with compensation or feedback windings or interacting coils, e.g. 0-flux sensors
G01R 15/181
Using inductive devices, e.g. transformers: using coils without a magnetic core, e.g. Rogowski coils
G01R
Measuring electric variables

Family

US 6,885,183 B2Related patent
US 2004/0201373 A1This patent

From the US filing history. Foreign family members aren’t listed.

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