Confirm the pressure challenge before measuring
A fine-leak check assumes the package has reached an allowed starting pressure and the fill transient has settled enough for the selected method. A large opening can prevent pressure from building. If the system measures only the later trace, that trace can look nearly flat after a poor fill because there is little pressure difference left to drive flow.
Packaging sample showroom of SamBound New Material Technology Company Ltd. (sambound.com).
Treat a low start as a separate result
Define the allowed pressure window and verify it each cycle. If the fill falls short, stop the fine-leak evaluation and check the package connection, fixture seating, supply and fill time. A blocked line may also let pressure build at the sensor without reaching the package, so verify that the test arrangement monitors a meaningful point.
An invalid fill can indicate a gross leak or a setup problem. Once the starting condition is valid, the measured decay can be judged against the limits established for that test.
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