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Transpector MPS Operating Manual
6.6.1.2.3 Tuning with Background Gases
Mass 4 must be calibrated for proper leak detection. If Transpector MPS is used as
a leak detector, make sure that Helium is available for tuning. If Transpector MPS
is only used for leak checking, mass 4 is the only mass to tune. To tune mass 4,
find a way to introduce Helium into the vacuum chamber.
The following procedure may be used if test mix or helium is not available:
1
Default all tune parameters.
2
Delete all masses except 1, 2, and 4.
3
Add mass 28 (or 40) and tune.
4
Delete mass 4.
5
Tune highest mass available in your system, in some cases this may be mass
40 or 44.