D397-21-880 Issue G
Page 26
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Operation
Figure 20 - Gauge setup screen ASG
Please refer to
for the error and diagnostic information for the ASG.
4.8.7
Active Inverted Magnetron (AIM) gauge control
Note:
This section covers both standard (AIM
−
S) and linear (AIM
−
X) output gauges including low magnetic field (
−
SL or
−
XL) and bakeable (type DN40CF) versions.
Note:
For a detailed specification and instructions regarding the use of the AIM
−
S and AIM
−
X gauges, refer to the
appropriate Instruction Manual (D146
-
41
-
885 & D146
-
61
-
880).
Active Inverted Magnetron (AIM) gauges are gas dependent, cold cathode, ionisation gauges, which measure pressures
in the range 1 x 10
-2
to 1 x 10
-9
mbar (7.5 x 10
-3
to 7.5 x 10
-10
Torr). There are a number of variants, offering standard
(AIM-S) and linear (AIM-X) outputs, low external magnetic field (AIM-SL and AIM-XL) variants for use on sensitive
scientific instruments and special bakeable tubes for use in UHV applications.
There are no additional setup options for AIM. (Refer to Default setup options (all gauges)
.
Please refer to
for the error and diagnostic information for the AIM gauge.
Table 16 - Error diagnostic monitoring ASG
Diagnostic messages
Description
Over Range
(Gauge output >11.000 V)
Indicates that either the measured gas pressure is outside the range of the gauge,
or that there is a fault with the gauge.
Clear the error message, reduce the process pressure to within the range of the
gauge, scroll to the gauge display line and press 'Cycle'. If the gauge fails to give a
pressure readout it should be replaced.
ASG Cant Zero
Indicates that the gauge output is outside the range
−
100 mV to
+
100 mV.
The most likely cause of this error is either attempting to zero the gauge at too
high a pressure or a gauge fault.
Attempt to zero the gauge again and if the fault persists, the gauge should be
replaced.