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GA10218_0101 - 5/2002
6.2.4 Contrast
Main menu > View > Contrast
The contrast of the display can be changed. The recommended value
under regular conditions is about 50 (Default setting).
If by accident the display has been set too bright or too dark so that it can
not be read off, this may be changed as follows:
Switch off the PhoeniXL and turn it on again. During the run-up phase
press the key no. 3 or 7 so long until the display can be read properly
again. This setting is saved to the EPROM only after confirming this
through the contrast menu. If this setting is not confirmed, the former set-
ting will be appled after switching on the instrument on again.
6.2.5 Background in Stand-by
Main menu > View > Background in Stand-by
The internal background leak rate can be displayed in Stand-by mode or
not.The default setting is OFF.
The internal background is generated by residual gas (e. g. helium) that
has not been pumped away yet. Sources for residual gas are air or absor-
bed gases from the inner surfaces of the PhoeniXL. This internal back-
ground will never disappear totally. Very clean systems which have been
pumped for a long time will show a background in the 10
-11
mbar l/s
range. Under normal conditions the background level is in the
10
-10
mbar l/s or low 10
-9
mbar l/s range.
When pressing START the current internal background is subtracted from
all further measured signals automatically. Thus it is made sure that only
Softkey 3: ↓
Fade the contrast to dark. The minimum values is 0.
Softkey 4: Invert display
Invert the contrast of the screen, that means background dark and font
bright.
Softkey 5: ?
Help text
Softkey 7: ↑
Fade the contrast to light. The maximum value is 99.
Softkey 3: Off
The background leak rate will not be shown.
Softkey 5: ?
Help text.
Softkey 7: ON
The background leak rate will be shown.
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