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Technical Information
Rough
Time
Test Time
To configure the auto sequencer mode:
1
Press the blue check to turn on the Auto Sequencer.
The pass/fail criterion is based on the reject set points that are enabled.
2
Press the value button associated with the Rough time.
The data entry pad appears.
3
Enter the time and press OK.
4
Press the value button associated with the Test time.
The data entry pad appears.
5
Enter the time and press OK.
Agilent Helium Leak Detector User Manual
Determines the amount of time that the leak detector is allowed to
evacuate the test object to the Maximum Test Pressure. In Auto
Sequencer mode, the leak detector transfers into test as soon as
the specified transfer pressure is met. If the specified test transfer
pressure is not achieved within the pre-selected rough time, the
system aborts the cycle and goes into Hold mode.
The Rough Time value is determined empirically and reflects the
typical time required to rough the test object to the specified test
pressure. Failure to achieve the test pressure within the pre-
selected rough time indicates a gross leak in the test object or test
fixturing, or that the time allowed was insufficient.
The rough timer records the amount of time the system spent in
the roughing phase prior to it entering the TEST mode. The rough
timer is intended to help you set up a rough time value since it can
be difficult to predict accurately how long the system is in the
roughing phase when you cycle. Put the system into TEST mode,
the rough timer records and displays the rough time so that you
can enter a rough time value close to what was recorded. For
example, if the rough timer records a value of 12 seconds, you can
then enter a value in the rough time that is slightly longer than
what was recorded, 15 seconds for example. The rough timer only
records a time when the auto sequencer is ON.
Determines the amount of time that the leak detector remains in
test before it compares the measured leak rate with the selected
reject set point. Allow sufficient time for the leak rate reading to
stabilize before the system makes a pass/fail decision. This is a
function of the part configuration and the leak rate specification. In
Auto Sequencer mode, the leak detector remains in test for the
entire duration of the preselected test time.
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