Observe a defined specimen with a defined leak method
- Pressure-decay test
Pressure change is monitored over time in the defined volume. Distinguish true leakage from temperature, settling and fixture effects.
- Tracer-gas test
The selected gas is detected after crossing a boundary. Specify the direction, pressure, detector method and complete test configuration.
- Device under test (DUT)This term
Identify the exact tested assembly and its preparation. A result for one specimen configuration does not qualify every product or installation.
Pressure decay infers leakage from a controlled volume and pressure history. Tracer gas detects gas crossing a boundary, while the device-under-test identity includes its complete configuration.
Conceptual apparatus and qualitative traces. Temperature stabilization, test volume, gas, detector calibration and fixture leakage affect results; no test acceptance limit is shown.