Jim B Pak

US Patent:

20120210562, Aug 23, 2012

Filed:

Feb 22, 2011

Appl. No.:

13/032107

Inventors:

Peter T. Jones - Scottsdale AZ, US
David T. Myers - Gilbert AZ, US
Franklin P. Myers - Mesa AZ, US
Jim D. Pak - Gilbert AZ, US

Assignee:

FREESCALE SEMICONDUCTOR, INC. - Austin TX

International Classification:

G01R 35/00
G01R 31/28

US Classification:

29593, 324202

Abstract:

Manufacturing of magnetometer units (′) employs a test socket () having a substantially rigid body () with a cavity () therein holding an untested unit () in a predetermined position () proximate electrical connection () thereto, wherein one or more magnetic field sources () fixed in the body () provide known magnetic fields at the position () so that the response of each unit () is measured and compared to stored expected values. Based thereon, each unit () can be calibrated or trimmed by feeding corrective electrical signals back to the unit () through the test socket () until the actual and expected responses match or the unit () is discarded as uncorrectable. In a preferred embodiment, the magnetic field sources () are substantially orthogonal coil pairs () arranged so that their centerlines (---) coincide at a common point () within the predetermined position (). Because the test-socket () is especially rugged and compact, other functions (e.g., accelerometers) included in the unit () can also be easily tested and trimmed.

US Patent:

20150130443, May 14, 2015

Filed:

Jan 16, 2015

Appl. No.:

14/599076

Inventors:

Peter T. Jones - Scottsdale AZ, US
David T. Myers - Gilbert AZ, US
Franklin P. Myers - Mesa AZ, US
Jim D. Pak - Gilbert AZ, US

International Classification:

G01R 35/00

US Classification:

324202

Abstract:

Manufacturing of magnetometer units employs a test socket having a substantially rigid body with a cavity therein holding an untested unit in a predetermined position proximate electrical connection thereto, wherein one or more magnetic field sources fixed in the body provide known magnetic fields at the position so that the response of each unit is measured and compared to stored expected values. Based thereon, each unit can be calibrated or trimmed by feeding corrective electrical signals back to the unit through the test socket until the actual and expected responses match or the unit is discarded as uncorrectable. In a preferred embodiment, the magnetic field sources are substantially orthogonal coil pairs arranged so that their centerlines coincide at a common point within the predetermined position. Because the test-socket is especially rugged and compact, other functions (e.g., accelerometers) included in the unit can also be easily tested and trimmed.