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Intelligent Yield Enhancement Test

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IYET is a dynamic retest strategy that automatically retests failing unpowered tests after cycling vacuum. Since only failing unpowered tests are retested (not all unpowered tests), IYET can yield the following benefits:

  • Higher throughput - Fewer tests are executed during each retest sequence.
  • Fewer false calls - Passing tests are not retested, so they have less of a chance to falsely fail.

IYET is implemented entirely in the testplan using BT-Basic. No software update is required. No tests need to be recompiled. No external programs are called.

IYET captures retest failure data and displays retest history for corrective action. By examining retest history and false calls, poorly debugged tests can be identified and corrected before impacting yield-over time. This can result in better fixture and tester performance.