INFICON UL5000 Dry Helium Leak Detector - Manual (Page 37)

Description and Working Principle
37
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When you want to see the raw signal (including underground) please press the
ZERO button about 3 seconds. The saved value will be reset to zero. The under-
ground signal will not be suppressed anymore.
The ZERO function can be selected to a special mode that allows to use it only when
the signal of a falling background becomes stable (see Chapter
6.6.2.3 )
4.2.2.5 MENU Button
The menu appears on the LC Display after pushing the Fig. 4-2 /12 during any
working mode.
If the menu is opened during the current session the operator will lead to the last
screen before the menu was left.
Pushing the MENU button again leads back to the screen of the previous working
mode. The software shows the last screen that was used before.
4.2.2.6 Soft Keys
The function of the eight Soft Keys Fig. 4-2 /2 … /5 and /8 … /11 depends on the
current menu. Only key 1 and 8 very often have the functions Back/Cancel
(Softkey no. 1) and OK (Softkey no. 8.).
Special Functions
When inputs are allowed or when settings can be selected in a submenu two of the
Soft Keys always have the same function:
• Soft Keys no. 1 Fig. 4-2 /2 is Cancel.
It allows to escape from the submenu without any changes of the present settings
and return to the previous menu page.
• Soft Keys no. 8 Fig. 4-2 /11 is OK.
The selected settings or edited values will be stored and the previous menu page
will be displayed again.
Fig. 4-4 undo zero
0
10
20
30
40
50
t3
leak rate
t
ZERO
> 3 s
raw signal
leak rate displayed