Field glossary

Decay test

Isolating the pump and watching the micron gauge for a rise; proves the vacuum holds, not just that it was reached

Used across 3 Anvilfield field guides, most in HVAC.

Also defined as

Isolating the pump and watching the micron gauge for a rise; a fast rise is a leak, a slow stall is moisture
Isolating the vacuum pump and watching the micron gauge for a rise that signals a leak or remaining moisture

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