D397-01-880 Issue E
Page 28
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Operation
4.8.8
Active Ion Gauge (AIGX-S) control
Note:
TIC does not support the AIGX-D variant of the AIGX range.
Note:
For a detailed specification and instructions regarding the use of the AIGX, refer to the Instruction Manual
(D048-50-880).
The Active Ion Gauge (AIGX-S) is a fully integrated active instrument, with a measuring range of 6.6 x 10
-2
to 6.6 x
10
-10
mbar (5 x 10
-2
to 5 x 10
-10
Torr). The gauge has a 1 volt/decade linear output in the range 0 to 10 V d.c. The
AIGX-S is supplied with two filaments, which may be manually selected at the gauge head. For maximum filament
life, the gauge includes automatic emission current switching and high-pressure shutdown. The only user selectable
features are a setpoint and degas facility.
The gauge also includes a comprehensive range of diagnostic outputs, which are displayed on TIC.
AIGX has menu options in addition to those shown. (Refer to Default setup options (all gauges)
. (Refer
).
Figure 21 - Gauge setup screen AIGX
Table 21 - Setup options AIGX
Menu option
Description
Degas
Allows the user to degas the gauge.
'Scroll' to 'Degas' and press 'Select'.
'Command Sent' appears for 1 s to confirm degas sequence initiated.
Note:
Whilst the gauge is degassing, the pressure output may read slightly higher
than normal.
The maximum duration of the degas cycle is 3 minutes, during which the pressure
shown on the 'View' screen will be suffixed with a 'DG' e.g. 1.67
DG
- 09. At the end of
the cycle, the gauge will automatically return to its normal operating mode.
If the pressure rises above 1.3 x 10
-4
mbar (1 x 10
-4
Torr) during the cycle, degas will
automatically stop until the pressure falls below 4 x 10
-5
mbar (3 x 10
-5
Torr), at which
point degas resumes for the remainder of the cycle.
Note:
There is no facility enabling degas to be manually switched off mid-cycle.
