Basic Testing 7-3
too short, temperature effects or component expansion may cause erroneous results
during the test phase.
Limits
In order to set a realistic test limits, the maximum admissible leak rate of the test
component must be determined. This can be obtained from component
specifications, trials, comparisons with previous test components or any other
reliable source of information.
7.1.5 Sealed Component Test Steps
The gauge decay model sealed component test type steps are:
Isolate
To isolate the test port from the metered volume whilst the volume is being
pressurized.
Fill 1
Pressurizes the metered volume using the selected regulator.
Fill 2
Pressurizes the metered volume using the selected regulator.
Measure
Connects the pressurized metered volume to the test port and reports the pressure
change.
Ven t
Vents the component and metered volume.
7.1.6 Fine Tuning
After you’ve entered the basic parameters into a program, you’re ready to fine-tune
your setup. A few tips:
• If not using external fixtures, set coupling time to zero.
• If product blows out of external fixtures, make sure you have a long enough coupling
time.
• If you get gross failures when testing a flexible product, try increasing fill time or
evacuate (for vacuum tests) time.
• Add fill and stabilize time to slow the decay rate and make it more consistent.
• If your test doesn’t need a vent valve to vent product pressure after testing, set the vent
parameter to off.
• In a flow test, set test time long enough for the product under test to fill and produce a
stable flow rate.
• If repeated parts failures of good parts occur, try widening the pressure error tolerance
or adding more fill or evacuate (for vacuum tests) time.
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