Model 979 Series Helium Mass Spectrometer Leak Detector
2-26
DRAFT 9/15/03
2.6.6.3 Serial Communications Protocol Set-Up
The Output Control Set-Up screen also allows for the selection of RS-232 communication
parameters, BAUD RATE, STOP BITS, and PARITY (see Appendix B “Communications
Protocol”).
2.6.7 Transfer Pressure Set-Up
Touch the TRANSFER POINTS SET-UP selection box to display the Transfer Pressure Set-Up
screen (Figure 2-16). From this screen set the test transfer pressures for each testing mode.
The factory default settings are shown in Figure 2-16.
Figure 2-16
Transfer Pressure Set-Up Screen
The transfer pressure settings may be adjusted to lower values for specific applications. The
979 has pre-programmed upper transfer pressure limits that are slightly greater than the
default settings. These limits prevent the operator from inadvertently setting the 979 to trans-
fer into test at too high a pressure, resulting in excessive spectrometer tube contamination or
ion source filament failure. Touch DONE to return to the previous menu.
If you make changes to the settings, touch OK to load the new values into memory and then
touch DONE to return to the previous menu.
Touching the ESC box before touching OK or DONE causes the selected parameter to revert
to its previously stored value.
BACK
LEAK RATE
OUTPUT
CAL
TRANSFER
LEAK
SET-UP
AUTO
SEQUENCER
SET-UP
RANGING
SET-UP
CONTROL
SET-UP
NEXT
POINTS
SET-UP
ROUGH
PUMP
SET-UP
REJECT &
AUDIO SET
POINTS
GROSS LEAK XFER:
7.5E+2
CONTRAFLOW LEAK XFER 5.0E-0
ESC
DONE
DN
UP
NXT
OK
TRANSFER PRESSURE SET-UP
OUTPUT
CONTROL
SET-UP
Summary of Contents for 979 Series
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