6 | Operation LINXON
46 / 90 LX218-Operating-Manual-en1-04-(1908)
Options Value range (min./max.) Comments
Not active Manual background
suppression deactivated
With start
Min:sec
2 s/5 min
If the most sensitive and
most active measurement
range has been reached,
ZERO is carried out after
the set time
MS-BG subtraction On The internal background is
subtracted by pressing
START.
The inner background is
generated by a residual
gas (e.g., helium), which
has not yet been pumped
out. The sources of
residual gas are the air or
gases absorbed by the
interior surfaces of the leak
detector. This background
will never disappear
completely. Very clean
systems that have been
pumped out for a long time
have a background in the
range of 10
-11
mbar l/s.
Under normal conditions, a
background in the range of
10
-10
mbar l/s or a lower
10
-9
mbar l/s range can be
expected.
With the activation of
"START", this currently
measured internal
background is
automatically subtracted
from all further
measurements. This
ensures that only the net
leak rate of the test object
is measured.
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