Auto Sequencer - Agilent Technologies VS Series Operation Manual

VS Series Helium Mass Spectrometer Leak Detectors
0 1 2
ROUGH TIME (SECS)
TEST TIME (SECS)
ROUGH TIMER
0 SECONDS
Rough Time
3 4 5 6

AUTO SEQUENCER

010
000
Figure 2-11 Auto Sequencer
Determines the amount of time that the leak detector is allowed
to evacuate the test object to the Maximum Test Pressure (see
Section 2.2.4.5 on page 2-28). 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.
7 8 9 10
✔
✕
DONE
DONE
Press the desired
value to access
its keypad
Toggles these
options on/off.
2-23