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constant volume sampling (CVS)

Glossary “constant volume sampling (CVS)” Definition:
Emissions sampling method which captures all of the exhaust gases from the test vehicle and combines them with a certain amount of outside air. A venturi is used to ensure that a constant flow (fixed volume) of exhaust and air flows through the sampling system.

constant mesh

Glossary “constant mesh” Definition:
Gears that mesh continually, such as a planetary gear, eliminating the clashing or grinding that may occur when other types of gears are shifted together.