Zaxis Isaac PD - Glossary

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Zaxis Inc. LLC
801.264.1000
2442 South 2570 West
West Valley City, UT 84119
6.4
Glossary.
A List of useful terms and where to nd additional information.
A
Abort a test, how to — Press the start button during the test. ABORT pops up in the
status box telling you the process has stopped. An aborted test does not register on the
tested or reject counters.
Atmosphere (1) — in this guide, atmosphere means room air pressure. Atmospher-
ic pressure is nearly synonymous with barometric pressure—an external force pushing
on all sides of every object on earth’s surface. During a ow test, product being test-
ed must ow into atmosphere, which causes a resistance to ow called back-pressure.
Room atmosphere can change due to uctuations in air conditioning or changing weath-
er conditions. (2) The word atmosphere can refer to a unit of measure equal to pres-
sure at average sea level. By convention, one atmosphere equals 1 bar. To say a test
was taken at one atmosphere means the test was made at (or converted to) average
sea level.
B
Barometric Pressure — Also called atmospheric pressure. The force caused by the
mass of air pressing down on the earth. Barometric pressure changes with elevation
and weather conditions. The Isaac’s regulator compensates for changes in barometric
pressure to provide a constant relative output.
Bulkhead Fitting — A connection passing through a panel or enclosure. One bulkhead
on the back of the Isaac is used for connecting the air supply to the tester. Bulkheads
on the front are used for test and coupling ports. Standard bulkheads on the front have
a 1/8” NPT (similar to R1/8 BSPT British Standard Pipe Taper) female thread. Isaac
offers a variety of bulkhead options.