Section 3.1.1 "Advanced Parameters - Agilent Technologies VS Series Operation Manual

VS Series Helium Mass Spectrometer Leak Detectors
3.1.1 Advanced Parameters
Press Advanced Parameters on the Set-Up screen and the Advanced Parameters
❑
screen appears (Figure 3-3).
Use this screen to configure the Auto-Zero < 0, Split Flow Factor, and spectrometer
Gain.
Arrows to the left of
the bar graph indicate
a leak rate under
the minimum
displayable value.
Activates the
Auto-zero function.
Auto-Zero<0 Active
0 1 2 3 4
ADVANCED PARAMETERS
AUTO-ZERO<0
ACTIVE
INACTIVE
Figure 3-3 Advanced Parameters
Adjusts the zero reference point automatically and continually to
the correct zero value when the helium background level drops
below the previously set zero reference point. This feature ensures
that the leak detector maintains a correct balance value after a pre-
viously zeroed background signal naturally cleans up (background
helium is pumped away).
When the Auto-Zero < 0 feature is in the process of re-adjusting
the zero reference point, the arrows located on the left end of the
bar graph illuminate. These arrows indicate that the measured
helium leak rate is currently less than the minimum displayable
value. The arrows may flash briefly as the system recovers from a
leak indication and the displayable leak rate approaches zero. If
the Auto-Zero < 0 is turned on, the arrows may also flash briefly as
the system resets the zero point to a lower value. The leak detector
does not display a leak rate while the arrows are on. If the arrows
remain on for more than a few seconds, press Zero to set operating
parameters to the correct zero value. This situation can occur if the
leak detector had not been fully warmed up when a previous cali-
bration was initiated.
Toggles these
options on/off.
5 6 7 8 9
SPLIT FLOW
✔
1.5E-07
LEAK RATE
GROSS
TEST
Arrows to the right
of the bar graph
10
indicate a leak rate
over the maximum
displayable value.
Accesses the
✕
keypad to set
the Split Flow
Factor.
DONE
DONE
3-3