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Stored Programs
A set of instructions (parameters) that can be set by the customer to run a variety of tests.
Users can alter stored program
s to meet specific product testing needs. Programs are configured in Isaac’s
Program
screen and are kept in NVRAM (Non-volatile.)
Supply Air
Compressed air or gas connected to the rear fitting labeled
Supply
. Isaac’s standard fitting is a 1/8”
NPT (Similar to R1/8 BSPT British Standard Pipe Taper) female thread bulkhead. Air must be clean, dry, and free
of oil
Target
A preprogrammed number that Zaxis stores in firmware used to calibrate Isaac’s pressure and flow
sensors. The target value is matched to a pressure or flows standard to create a lookup table for sensor linearity
adjustment.
Test Circuit
The pneumatic tubing, fittings, valves, and sensors that make up Isaac’s internal air passages. The
volume of gas trapped inside the pressure decay test circuit is about 1.0 cubic centimeter.
Test Cycle
A test cycle is all Isaac-controlled testing activities that occur from the time the
START
switch is
pressed to the time the operator removes the tested product. One test cycle can have multiple tests by linking
programs in Isaac’s
Program
screen. Multiple tests in one test cycle are sometimes called a test series.
Test Phases
The three testing modes (decay, flow, and burst) each have individual phases or intervals of testing.
Pressure decay has four possible time intervals that can be set: coupling, fill, settle, and test. A flow test has three
phases: coupling, fill, and test. A burst test has just two possible phases: coupling and test.
Test Port
The bulkhead fitting (or fittings) on Isaac’s front panel.
The product to be tested is connected to the
test port. From the test port, Isaac can supply positive pressure or vacuum for a variety of leak and flow test.
Customized Isaacs could have multiple test ports. See
Bulkhead
.
Test Pressure
Test pressure is the level of air pressure used to inflate product under test. Test pressure is set by
adjusting the regulator on the rear panel of Isaac. Test pressure can only be set if Isaac has supply air connected
to the back fitting, and the output port is blocked with a leak-tight cap.
Test Pressure Info Box
An area on the
Main
screen that shows pressure values depending on test type (decay,
flow, or burst), and depending on what phase the test is in.
In a pressure decay test, this info box shoes the preset test pressure (set with the regulator) during coupling
phase. It shows actual applied pressure during the fill and settle phase. In test phase, the info box shows the last
reading made during the settle phase.
In a flow test, the pressure box shows preset test pressure during coupling time. In fill and test times, it shows
actual applied pressure, and holds the last pressure reading made at the end of test phase.
In burst, preset pressure is displayed during coupling and test times.
