Agilent Technologies G8610A Operation Manual page 85

Agilent Technologies Helium Leak Detector
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.
Determines the amount of time that the leak detector is allowed
to evacuate the test object to the Maximum Test Pressure (see
Section 5.1.2.2 on page 75). 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 rough-
ing 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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