First Pass Yield / FPY
First Pass Yield, or FPY for short, describes the percentage of test specimens that successfully pass a test process on the first run. This value indicates how many assemblies are deemed defect-free without the need for re-inspection, rework, or retesting.
In printed circuit board testing, First Pass Yield is a key indicator of the stability of the testing process. Contact issues, contaminated solder joints, flux residues, or oxide layers can lead to measurement errors and reduce the FPY.
Reliable contact supports a higher First Pass Yield because Test Points are reached more reliably and electrical connections are established more stably. This allows test processes to be designed more efficiently and avoids unnecessary retests.
FAQ
First Pass Yield describes the percentage of test items that pass a test on the first attempt without rework or retesting.
A high FPY indicates that the contact, test procedure, and process quality are stable. A low FPY may indicate contact issues or recurring test anomalies.
A higher FPY reduces rework, troubleshooting, and re-inspection. This can make inspection processes more efficient and lower the total cost of ownership.
Further terms
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