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GB 03435 - Edition Edition 03 - October 09
A Commissioning
B Product
description
C Settings
D Test
mode
E RS232
mode
F Appendices
Configuring the gauges
Specific settings
Combined CRYSTAL/
Hot cathode gauge
(AHC 2010)
Degassing function
Description
Deposits on the electrode system of an AHC 2010 combined
CRYSTAL/Hot cathode gauge can effect the measured values or make
them unstable.
Degassing involves heating the electron collector grid to 70°C
by electronic bombardment, thus cleaning the electrode system.
Degassing normally lasts 3 minutes but can be interrupted prematurely.
The function is permitted for pressures < 5.10
-3
mbar (pressure
advised < 1.10
-5
mbar).
Activating the degassing function:
–> via the controller
1 - Access :
SET/PROG1/6. DEGS
2 - Press on the button
, then
ENTER
. While degassing is in progress
(approx. 3 minutes),
- “Degas” is displayed on the measuring screen,
- ignore the displayed pressure values which will be wrong during this
operation.
–> via the Remote connector (DEGAS wiring - see Appendix 4))
Note: degassing is impossible when
- degassing has just stopped after 3 minutes
- the pressure is greater than 5 x 10
-3
mbar
- «HV-DSBL» is active.
Factory default setting
The "DEGAS" function is deactivated by default, i.e., factory set to
OFF.
Note: if the «DEGAS» function can’t be activated, the «ERR08» message
displays. (see Appendix 6 for the error message list).
Description
This function deactivates the hot cathode gauge.
Only pressure values measured with the CRYSTAL gauge appear.
Activating the HV-DSBL function:
–> via the controller
1 - Access :
SET/PROG1/9. DSBL
2 - Press the button
, then
ENTER
. HV-DSBL comes up on the screen.
–> via the Remote connector (HV-DSBL wiring - see Appendix 4)
To reactivate measurement, press «HV-DSBL» again.
Factory default setting
The "Hot cathode deactivation function" is deactivated by default, i.e.,
factory set to
OFF.
Hot cathode deactivation
function
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