Electricity: measuring and testing – Magnetic – Magnetic information storage element testing
Patent
1997-10-15
1998-10-13
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Magnetic information storage element testing
324228, 324262, 324758, 324761, G01R 3312, G01R 3100, G11B 5455
Patent
active
058217460
ABSTRACT:
A test apparatus for testing a plurality of magnetic recording heads. The apparatus includes a tool which supports a bar that contains a number of individual magnetic recording heads. Alternatively, the tester may contain a tool which supports a plurality of individual sliders. The tool locates the heads within a magnetic field emanating from a coil wound magnet. The magnet has a length and permeability that provides a uniform magnetic field for each slider in the entire bar. The test apparatus includes a probe card that has a plurality of probe needles which make simultaneous contact with the bonding pads of each head. The needles are coupled to a test circuit that applies a constant current to the magnetic recording heads and measure a change in voltage as a function of a varying magnetic field. The tester can sequentially test the heads without spatially moving the bar, thereby minimizing the test cycle time of testing the heads. Alternatively, the tester may test two or more of the heads simultaneously.
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Phase Metrics, Inc.
Strecker Gerard R.
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