Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1992-04-21
1993-11-16
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
324 731, 324158P, G01R 3102
Patent
active
052627160
ABSTRACT:
A system and method for calibrating testers. A reference timing signal and an internal timing signal used in tester calibration are generated within a tester. A first calibration is performed wherein test module channel characteristics are measured and recorded, and an adjustment value is determined to correct the time placement of the internal timing signal. Driver and receiver delays are adjusted based on the characteristics measured in this first calibration, and the internal timing signal is adjusted as well. A second calibration is performed wherein temporal relationships between the adjusted internal timing signal and signals at the test module channel mint pins are determined. Driver and receiver delays are adjusted based on the results of this calibration. An optional calibration is performed wherein temporal relationship between the adjusted internal timing signal and signals at the board-interface end of a test fixture are measured. Using these measurements and the measurements obtained in the second calibration, a test fixture characterization is performed and recorded. Delays of the drivers and receivers are again adjusted to account for the fixture characteristics. Additional calibration methods provided by the present invention include a manual multi-module calibration to keep test module channels aligned when a new module is designated as the master module, and a manual synchronization clock calibration to deskew drivers and receivers relative to an external clock supplied by the device under test.
REFERENCES:
patent: 4504783 (1985-03-01), Zasio et al.
patent: 5099196 (1992-03-01), Longwell et al.
Jay M. Stapleton; A New System Architecture for a Combined In-Circuit/Functional Tester; 1989; pp. 763-772.
Barry A. Alcorn; Writing Correct & Usable Specifications for Board Test: A Case Study; 1989; pp. 773-786.
Philip N. King; Flexible, High-Performance Pin Electronics Implementation; 1989; pp. 787-794.
Maintaining the HP 82000, HP82000 Models D200/D50, Revision 2, Dec. 1989, pp. 5-1 to 5-37.
Glasgow Davis M.
Gregory, Jr. Walter L.
Lannen Kay C.
Stepleton Jay M.
Hewlett--Packard Company
Karlsen Ernest F.
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