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Technical Information
Auto Sequencer
The Agilent Auto Sequencer facilitates programming a repetitive test cycle for leak
testing parts that have been sealed with helium inside. This can improve
productivity and reduce testing errors. Settings available in this mode include:
Program timers for the roughing and test modes.
Entering set point values for audible and visual alarms.
Establishing a lower level verification leak to improve reliability of the test.
Setting a pressure set point that saves time by rejecting a part if the pump
down characteristics fall outside of the norm.
The auto sequencer is used to automatically perform testing on a part, to maximize
testing throughput and to reduce the chances of accidentally accepting a bad part.
The auto sequencer is used in conjunction with the reject and audio set point
settings, which provide the criteria for pass or fail conditions. Within the auto
sequencer feature, there are two variables that must be set, rough time and test
time. The ROUGH TIME setting indicates to the system the maximum time it is
allowed to be in roughing before the test fails. Ideally, the system goes into the
roughing phase and then proceeds to TEST. The TEST TIME setting tells the
system when to perform the test against the set point values. For example, you
may set 20 seconds for the TEST TIME. At the end of 20 seconds, the system
determines if the part has passed or not and then makes an indication by either
going to VENT (Pass) or going to HOLD (Fail) and displaying the reject set point
failure on the front panel
Press Auto Sequencer Set-Up on the Menus screen.
The Auto Sequencer Set-Up screen appears (see the following figure). The leak
detector can be configured to automatically run through a complete test cycle
(Start/Rough/Test/Vent).
During the test cycle, the system ensures that during the Rough Time the user-
entered pressure transfer set points are met.
A Pass condition is indicated by the system reverting to the Vent mode upon
completion of the test cycle. A Fail condition is indicated by the system
reverting to the Hold mode, and all operating buttons being disabled except
Vent. A failed condition also results in a red activated set point box in the Set
Point window appearing on the Home screen, along with a reject set point
activation upon completion of the test cycle. The status of the reject set points
are available through the RS-232 line (see Appendix A "Communications
Protocol"). On completion of an automated test cycle, the leak detector
captures the leak rate signal measured just prior to the end of the automated
test cycle. This leak rate appears on the Home screen until the next test cycle is
initiated.
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Agilent Helium Leak Detector User Manual
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