INFICON UL1000 Helium leak detector - Manual (Page 42)

42
Description and Working Principle
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When the measurement signal declines below the saved underground value the
underground value will automatically be equated with the measurement signal. As
soon as the measurement signal is increasing again the saved decreasing value
remains constant. Increasings of the signal are displayed clearly as a leak.
When you want to see the measurement signal (including underground) please press
the ZERO button about 3 seconds. The saved value will be reset to zero. The
underground signal will not be suppressed anymore.
Notice: The ZERO functions can be selected to a special mode that allows to use
it only when the signal of the falling background becomes stable (see
Chapter
6.6.2.2 ).
Fig. 4-3 decreasing background
Fig. 4-4 undo ZERO