Varian 979 Series, Руководство по эксплуатации

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Model 979 Series Helium Mass Spectrometer Leak Detector
DRAFT 9/15/03
2-17
2.6.3 Auto Sequencer Set-Up
Touch the AUTO SEQUENCER SET-UP box to display the Auto Sequencer Set-Up screen
Figure 2-10. Auto sequencer provides the ability to set up the 979 so that it automatically
runs through a complete test cycle (START/ROUGH/TEST/VENT), passing or failing the test
part per the test specification entered by the user. The auto sequencer set-up controls
include test object rough time, test time, and auto sequencer on/off. A Pass or Fail condition
is determined based upon the reject set point selected by the user and/or achievement of the
pressure transfer set points within the period of time specified in Rough Time.
Figure 2-10 Auto Sequencer Set-Up Screen
The auto sequencer pass or fail leak rate value is selected through the Reject Set Point
screen. The pass/fail criterion is based on the reject set point that is enabled (ON). If more
than one set point is enabled, then the pass/fail criterion is based on the most stringent reject
set point value.
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
REJECTED being displayed on the Home screen of the touch panel, and a reject set point
activation upon completion of the test cycle. The status of the reject set points are available
at the I/O port and upon inquiry through the RS-232 line (see Appendix B “Communications
Protocol”).
Upon the completion of an automated test cycle, the 979 captures the leak rate signal mea-
sured just prior to the end of the automated test cycle. This leak rate is displayed on the front
panel and held at the analog output I/O port on the back of the leak detector until the next
test cycle is initiated. This allows the end user to record the actual leak rate value for each
test object.
ESC DONE
AUTO SEQUENCER SET-UP
OK
DN
UP
NXT
ROUGH TIME (SECS): XXX
TEST TIME (SECS): XXX
OFF
BACK
LEAK RATE
OUTPUT
CAL
TRANSFER
LEAK
SET-UP
REJECT &
AUDIO SET
POINTS
AUTO
SEQUENCER
SET-UP
RANGING
SET-UP
CONTROL
SET-UP
NEXT
POINTS
SET-UP
ROUGH
PUMP
SET-UP