36 tinb29e1-c (2019-10) VGC083A_B.om
Example - To perform ALT GAUGE CAL if ALT GAUGE menu is selected for ITI
LOG CG, ITI LOG IG or ITI NON-LINE. When using other INFICON vacuum gauge
modules such as PGE300, PGE500 or BAG302 as alternate gauges to CG2, the
analog output signals from these devices can be used to display pressure in the
CG2/ALT display channel. Connect the analog output from these devices to the +
and – terminals of the VGC083 Analog Input Connector labeled AI. In the ALT
GAUGE CAL screen use the UP or DOWN keys to adjust the displayed pressure
by the VGC083 to match the pressure reading on the modules.
As you adjust the analog output, the number being displayed in the ALT GAUGE
CAL screen represents the millivolts offset from zero volts that is being used inter-
nally for the analog input gain adjustment.
[Factory default = DEGAS STATUS]
A degas status or an error condition output signal is available from the DIGITAL I/O
connector. If selected for DEGAS STATUS, this can be used as an output signal to
other external instruments to confirm that degas is on or off. If selected for ERROR
STATUS, this can be used as an output signal to other external instruments to con-
firm whether there is an error condition.
[Factory default = PRESS ENTER TO SET OR MENU TO EXIT]
The system can be returned to the original factory settings by using the ENTER
key to set factory defaults. The IG filament must be off (sensors off) in order to
reset defaults.
If you reset all values to original factory default settings, you would need to repeat
the initial setup procedure for the convection gauges as described in section 5.6
and reprogram other parameters as required.
As mentioned previusly the VGC083A/B controller is shipped from the factory with
the ION GAUGE menu default parameters for the nude or glass IG. If you are using
the BAG055 Mini IG, connect the Mini IG cable at the controller first, turn power on,
access the SETUP UNIT Menu and set 'DEFAULTS'. This is recommended only
one time at the initial set-up and it enables the controller realize its operating the
BAG055 Mini IG and will set the default ION GAUGE menu parameters for
BAG055. Always power off the unit before disconnecting the IG cable and recon-
nect the IG cable before turning the power on to ensure proper operation.
Before you activate the ion gauge/filament, make sure you understand all instruc-
tions and information provided in this manual and the Operating Manual for the
PGE050 convection gauge. Furthermore, you should ensure you have fully config-
ured the VGC083 control unit to your operational requirements before turning the
filaments on. When using the BAG050 / 051 / 052 / 053 and prior to turning on the
ion gauge filament you should ensure the pressure is below 1.00E-03 Torr
(1 mTorr) with emission current set at 100 μA; 5.00E-04 Torr with emission current
set at 4 mA and 1.00E-04 Torr with emission current set at 10 mA. When using the
BAG055 Mini IG and prior to turning on the ion gauge filament you should ensure
the pressure is below 5.00E-02 Torr (10 mTorr) with emission current set at 100 μA
and 1.00E-03 Torr with emission current set at 4 mA.
CAUTION! Due to the risk of filament failure caused by inadvertent exposure
to oxidizing gases or gas mixtures, never use another gauge to automatically turn
off the ion gauge when the ion gauge filament in use is constructed of tungsten
(yttria coated iridium filament is okay). The response time of other gauges may not
allow for timely turn off of the filament leading to filament damage especially for
tungsten filaments. Always turn the tungsten IG filament OFF manually before
pressure is allowed to rise above 1.00E-03 Torr.
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