LACO ORIGINAL OPERATING INSTRUCTIONS TITANTEST™
44
© 2018 LACO TECHNOLOGIES, INC. - [TitanTest itna01en1-07 BA.fm] - 1807
The mass spectrometer background subtraction is set as a default. Refer to
the following table for more details:
► Select " Setup > Test settings > Filter & ZERO".
Information about the active background suppression is shown in the status
line of the measuring screen:
6.4.3 Set vacuum ranges
In "Sniff" operating mode, you cannot change the following settings:
I
Table 20: Filter and ZERO
Option Value range
(Min. Max.)
Comment
Filter Dynamic Leakage rate filter with dynamic adjustment of the time constant
Static Leakage rate filter with fixed time constant
None No leakage rate filter
ZERO Enabled Manual background suppression enabled
Disabled Manual background suppression disabled
With Start
min:sec
2 s / 5 min
If the most sensitive and enabled measurement range has been reached, "ZERO" is executed after the set time.
MS-BG-Subtraction on The internal background is subtracted by pressing "START".
The internal background is created from residual gas (e.g. helium) that has not been pumped out yet. The sources for re-
sidual gas are the air or gases absorbed from the inner surfaces of the leak detector. This background will never disappear
entirely. 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 low 10
-9
mbar l/s range can be expected.
By activating "START", this currently measured internal background is automatically subtracted from all further measure-
ments. This ensures that only the net leakage rate of the test object is measured.
If the leak detector is put back into Standby/STOP mode, a new background is adopted after 25 seconds the earliest.
off At START the internal mass spectrometer background (MS-BG) is not subtracted.
See description at "on".
Table 21: Display for background suppression
Display Trigger
ZERO after briefly pressing the ZERO button in the setting "enabled" or "with Start"
ZERO START appears after the preset time elapses in the setting "with Start"
Table 22: Vacuum range settings
Option Value range
(Min. Max.)
Comment
ULTRA Enabled Enabled
Disabled Disabled
0.01 - 0.5 mbar Pressure at which valve V4 opens
FINE Enabled Enabled
Disabled Disabled
0.1 = 5 mbar Pressure at which valve V3 opens
GROSS Enabled Enabled
Disabled Disabled
0.1 = 25 mbar Pressure at which valve V1 opens
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