Patent ID: 7979225
Filing Date: 2011-07-12
Classification: G01R

Abstract:
1. A method of assessing a pass-fail threshold for a device comprising: determining the pass-fail threshold to be within one of a pass-side boundary and a fail-side boundary based on whether the device operated properly or improperly when repeatedly subjected to amplitude varied test signals, the pass-side boundary corresponding with test signals at which the device operated properly and the fail-side boundary corresponding with test signals at which the device operated improperly; and narrowing a range between the boundaries by increasing or decreasing the amplitude of the test signals depending on whether the device operated properly or improperly during the last test signal; initially determining the boundaries by varying a value used to increase or decrease the amplitude of the test signal by a variable amount that changes for each test; and after initially determining the boundaries, more precisely defining the boundaries by varying the value used to increase or decrease the amplitude of the test signal by a fixed amount that remains fixed for each test.