LEYBOLD 250000, Руководство по эксплуатации

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GA10218_0101 - 5/2002 ⏐
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4.1.2.4 ZERO Button
Pushing the ZERO Button Fig. 8 /11 enables the zero mode. (see also
Chapter 4.1.6)
When pressing ZERO the currently measured leak rate is taken as a back-
ground signal and is subtracted from all further measurements. As a result
the displayed leak rate then is
After pressing ZERO ( Fig. 9 , t=1) the decreasing background is fitted to
the course ( Fig. 9 , t=2) automatically. When the measurement signal decli-
nes below the saved backgrond 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 So it is possible to
recognize leaks even when the signal is decreasing rapidly.
1·10
-8
mbarl/s in GROSS
1·10
-12
mbarl/s in FINE
Fig. 9 Zero activation
Fig. 10 Undo ZERO